Module textual.widget
Expand source code
from __future__ import annotations
from asyncio import Lock, wait, create_task
from fractions import Fraction
from itertools import islice
from operator import attrgetter
from typing import (
Awaitable,
Generator,
TYPE_CHECKING,
ClassVar,
Collection,
Iterable,
NamedTuple,
Sequence,
cast,
)
import rich.repr
from rich.console import (
Console,
ConsoleOptions,
ConsoleRenderable,
JustifyMethod,
RenderableType,
RenderResult,
RichCast,
)
from rich.measure import Measurement
from rich.segment import Segment
from rich.style import Style
from rich.text import Text
from . import errors, events, messages
from ._animator import BoundAnimator, DEFAULT_EASING, Animatable, EasingFunction
from ._arrange import DockArrangeResult, arrange
from ._context import active_app
from ._layout import Layout
from ._segment_tools import align_lines
from ._styles_cache import StylesCache
from ._types import Lines
from .binding import NoBinding
from .box_model import BoxModel, get_box_model
from .css.scalar import ScalarOffset
from .dom import DOMNode, NoScreen
from .geometry import Offset, Region, Size, Spacing, clamp
from .layouts.vertical import VerticalLayout
from .message import Message
from .messages import CallbackType
from .reactive import Reactive
from .render import measure
if TYPE_CHECKING:
from .app import App, ComposeResult
from .scrollbar import (
ScrollBar,
ScrollBarCorner,
ScrollDown,
ScrollLeft,
ScrollRight,
ScrollTo,
ScrollUp,
)
_JUSTIFY_MAP: dict[str, JustifyMethod] = {
"start": "left",
"end": "right",
"justify": "full",
}
class AwaitMount:
"""An awaitable returned by mount() and mount_all().
Example:
await self.mount(Static("foo"))
"""
def __init__(self, widgets: Sequence[Widget]) -> None:
self._widgets = widgets
def __await__(self) -> Generator[None, None, None]:
async def await_mount() -> None:
aws = [
create_task(widget._mounted_event.wait()) for widget in self._widgets
]
if aws:
await wait(aws)
return await_mount().__await__()
class _Styled:
"""Apply a style to a renderable.
Args:
renderable (RenderableType): Any renderable.
style (StyleType): A style to apply across the entire renderable.
"""
def __init__(
self, renderable: "RenderableType", style: Style, link_style: Style | None
) -> None:
self.renderable = renderable
self.style = style
self.link_style = link_style
def __rich_console__(
self, console: "Console", options: "ConsoleOptions"
) -> "RenderResult":
style = console.get_style(self.style)
result_segments = console.render(self.renderable, options)
_Segment = Segment
if style:
apply = style.__add__
result_segments = (
_Segment(text, apply(_style), control)
for text, _style, control in result_segments
)
link_style = self.link_style
if link_style:
result_segments = (
_Segment(
text,
style
if style._meta is None
else (style + link_style if "@click" in style.meta else style),
control,
)
for text, style, control in result_segments
)
return result_segments
def __rich_measure__(
self, console: "Console", options: "ConsoleOptions"
) -> Measurement:
return self.renderable.__rich_measure__(console, options)
class RenderCache(NamedTuple):
"""Stores results of a previous render."""
size: Size
lines: Lines
@rich.repr.auto
class Widget(DOMNode):
"""
A Widget is the base class for Textual widgets.
See also [static][textual.widgets._static.Static] for starting point for your own widgets.
"""
DEFAULT_CSS = """
Widget{
scrollbar-background: $panel-darken-1;
scrollbar-background-hover: $panel-darken-2;
scrollbar-color: $primary-lighten-1;
scrollbar-color-active: $warning-darken-1;
scrollbar-corner-color: $panel-darken-1;
scrollbar-size-vertical: 2;
scrollbar-size-horizontal: 1;
link-background:;
link-color: $text;
link-style: underline;
link-hover-background: $accent;
link-hover-color: $text;
link-hover-style: bold not underline;
}
"""
COMPONENT_CLASSES: ClassVar[set[str]] = set()
can_focus: bool = False
"""Widget may receive focus."""
can_focus_children: bool = True
"""Widget's children may receive focus."""
expand = Reactive(False)
"""Rich renderable may expand."""
shrink = Reactive(True)
"""Rich renderable may shrink."""
auto_links = Reactive(True)
"""Widget will highlight links automatically."""
hover_style: Reactive[Style] = Reactive(Style, repaint=False)
highlight_link_id: Reactive[str] = Reactive("")
def __init__(
self,
*children: Widget,
name: str | None = None,
id: str | None = None,
classes: str | None = None,
) -> None:
self._size = Size(0, 0)
self._container_size = Size(0, 0)
self._layout_required = False
self._repaint_required = False
self._default_layout = VerticalLayout()
self._animate: BoundAnimator | None = None
self.highlight_style: Style | None = None
self._vertical_scrollbar: ScrollBar | None = None
self._horizontal_scrollbar: ScrollBar | None = None
self._scrollbar_corner: ScrollBarCorner | None = None
self._render_cache = RenderCache(Size(0, 0), [])
# Regions which need to be updated (in Widget)
self._dirty_regions: set[Region] = set()
# Regions which need to be transferred from cache to screen
self._repaint_regions: set[Region] = set()
# Cache the auto content dimensions
# TODO: add mechanism to explicitly clear this
self._content_width_cache: tuple[object, int] = (None, 0)
self._content_height_cache: tuple[object, int] = (None, 0)
self._arrangement: DockArrangeResult | None = None
self._arrangement_cache_key: tuple[int, Size] = (-1, Size())
self._styles_cache = StylesCache()
self._rich_style_cache: dict[str, Style] = {}
self._stabilized_scrollbar_size: Size | None = None
self._lock = Lock()
super().__init__(
name=name,
id=id,
classes=self.DEFAULT_CLASSES if classes is None else classes,
)
self._add_children(*children)
virtual_size = Reactive(Size(0, 0), layout=True)
auto_width = Reactive(True)
auto_height = Reactive(True)
has_focus = Reactive(False)
mouse_over = Reactive(False)
scroll_x = Reactive(0.0, repaint=False, layout=False)
scroll_y = Reactive(0.0, repaint=False, layout=False)
scroll_target_x = Reactive(0.0, repaint=False)
scroll_target_y = Reactive(0.0, repaint=False)
show_vertical_scrollbar = Reactive(False, layout=True)
show_horizontal_scrollbar = Reactive(False, layout=True)
@property
def siblings(self) -> list[Widget]:
"""Get the widget's siblings (self is removed from the return list).
Returns:
list[Widget]: A list of siblings.
"""
parent = self.parent
if parent is not None:
siblings = list(parent.children)
siblings.remove(self)
return siblings
else:
return []
@property
def visible_siblings(self) -> list[Widget]:
"""A list of siblings which will be shown.
Returns:
list[Widget]: List of siblings.
"""
siblings = [
widget for widget in self.siblings if widget.visible and widget.display
]
return siblings
@property
def allow_vertical_scroll(self) -> bool:
"""Check if vertical scroll is permitted.
May be overridden if you want different logic regarding allowing scrolling.
Returns:
bool: True if the widget may scroll _vertically_.
"""
return self.is_scrollable and self.show_vertical_scrollbar
@property
def allow_horizontal_scroll(self) -> bool:
"""Check if horizontal scroll is permitted.
May be overridden if you want different logic regarding allowing scrolling.
Returns:
bool: True if the widget may scroll _horizontally_.
"""
return self.is_scrollable and self.show_horizontal_scrollbar
@property
def _allow_scroll(self) -> bool:
"""Check if both axis may be scrolled.
Returns:
bool: True if horizontal and vertical scrolling is enabled.
"""
return self.is_scrollable and (
self.allow_horizontal_scroll or self.allow_vertical_scroll
)
@property
def offset(self) -> Offset:
"""Widget offset from origin.
Returns:
Offset: Relative offset.
"""
return self.styles.offset.resolve(self.size, self.app.size)
@offset.setter
def offset(self, offset: Offset) -> None:
self.styles.offset = ScalarOffset.from_offset(offset)
def get_component_rich_style(self, name: str) -> Style:
"""Get a *Rich* style for a component.
Args:
name (str): Name of component.
Returns:
Style: A Rich style object.
"""
style = self._rich_style_cache.get(name)
if style is None:
style = self.get_component_styles(name).rich_style
self._rich_style_cache[name] = style
return style
def _arrange(self, size: Size) -> DockArrangeResult:
"""Arrange children.
Args:
size (Size): Size of container.
Returns:
ArrangeResult: Widget locations.
"""
arrange_cache_key = (self.children._updates, size)
if (
self._arrangement is not None
and arrange_cache_key == self._arrangement_cache_key
):
return self._arrangement
self._arrangement_cache_key = arrange_cache_key
self._arrangement = arrange(self, self.children, size, self.screen.size)
return self._arrangement
def _clear_arrangement_cache(self) -> None:
"""Clear arrangement cache, forcing a new arrange operation."""
self._arrangement = None
def mount(self, *anon_widgets: Widget, **widgets: Widget) -> AwaitMount:
"""Mount child widgets (making this widget a container).
Widgets may be passed as positional arguments or keyword arguments. If keyword arguments,
the keys will be set as the Widget's id.
Example:
```python
self.mount(Static("hello"), header=Header())
```
Returns:
AwaitMount: An awaitable object that waits for widgets to be mounted.
"""
mounted_widgets = self.app._register(self, *anon_widgets, **widgets)
return AwaitMount(mounted_widgets)
def compose(self) -> ComposeResult:
"""Called by Textual to create child widgets.
Extend this to build a UI.
Example:
```python
def compose(self) -> ComposeResult:
yield Header()
yield Container(
TreeControl(), Viewer()
)
yield Footer()
```
"""
return
yield
def _post_register(self, app: App) -> None:
"""Called when the instance is registered.
Args:
app (App): App instance.
"""
# Parse the Widget's CSS
for path, css, tie_breaker in self.get_default_css():
self.app.stylesheet.add_source(
css, path=path, is_default_css=True, tie_breaker=tie_breaker
)
def _get_box_model(
self, container: Size, viewport: Size, fraction_unit: Fraction
) -> BoxModel:
"""Process the box model for this widget.
Args:
container (Size): The size of the container widget (with a layout)
viewport (Size): The viewport size.
fraction_unit (Fraction): The unit used for `fr` units.
Returns:
BoxModel: The size and margin for this widget.
"""
box_model = get_box_model(
self.styles,
container,
viewport,
fraction_unit,
self.get_content_width,
self.get_content_height,
)
return box_model
def get_content_width(self, container: Size, viewport: Size) -> int:
"""Called by textual to get the width of the content area. May be overridden in a subclass.
Args:
container (Size): Size of the container (immediate parent) widget.
viewport (Size): Size of the viewport.
Returns:
int: The optimal width of the content.
"""
if self.is_container:
assert self._layout is not None
return self._layout.get_content_width(self, container, viewport)
cache_key = container.width
if self._content_width_cache[0] == cache_key:
return self._content_width_cache[1]
console = self.app.console
renderable = self._render()
width = measure(console, renderable, container.width)
if self.expand:
width = max(container.width, width)
if self.shrink:
width = min(width, container.width)
self._content_width_cache = (cache_key, width)
return width
def get_content_height(self, container: Size, viewport: Size, width: int) -> int:
"""Called by Textual to get the height of the content area. May be overridden in a subclass.
Args:
container (Size): Size of the container (immediate parent) widget.
viewport (Size): Size of the viewport.
width (int): Width of renderable.
Returns:
int: The height of the content.
"""
if self.is_container:
assert self._layout is not None
height = (
self._layout.get_content_height(
self,
container,
viewport,
width,
)
+ self.scrollbar_size_horizontal
)
else:
cache_key = width
if self._content_height_cache[0] == cache_key:
return self._content_height_cache[1]
renderable = self.render()
options = self._console.options.update_width(width).update(highlight=False)
segments = self._console.render(renderable, options)
# Cheaper than counting the lines returned from render_lines!
height = sum(text.count("\n") for text, _, _ in segments)
self._content_height_cache = (cache_key, height)
return height
def watch_hover_style(
self, previous_hover_style: Style, hover_style: Style
) -> None:
if self.auto_links:
self.highlight_link_id = hover_style.link_id
def watch_scroll_x(self, new_value: float) -> None:
if self.show_horizontal_scrollbar:
self.horizontal_scrollbar.position = int(new_value)
self.horizontal_scrollbar.refresh()
self.refresh(layout=True)
def watch_scroll_y(self, new_value: float) -> None:
if self.show_vertical_scrollbar:
self.vertical_scrollbar.position = int(new_value)
self.vertical_scrollbar.refresh()
self.refresh(layout=True)
def validate_scroll_x(self, value: float) -> float:
return clamp(value, 0, self.max_scroll_x)
def validate_scroll_target_x(self, value: float) -> float:
return clamp(value, 0, self.max_scroll_x)
def validate_scroll_y(self, value: float) -> float:
return clamp(value, 0, self.max_scroll_y)
def validate_scroll_target_y(self, value: float) -> float:
return clamp(value, 0, self.max_scroll_y)
@property
def max_scroll_x(self) -> int:
"""The maximum value of `scroll_x`."""
return max(
0,
self.virtual_size.width
- self.container_size.width
+ self.scrollbar_size_vertical,
)
@property
def max_scroll_y(self) -> int:
"""The maximum value of `scroll_y`."""
return max(
0,
self.virtual_size.height
- self.container_size.height
+ self.scrollbar_size_horizontal,
)
@property
def scrollbar_corner(self) -> ScrollBarCorner:
"""Return the ScrollBarCorner - the cells that appear between the
horizontal and vertical scrollbars (only when both are visible).
"""
from .scrollbar import ScrollBarCorner
if self._scrollbar_corner is not None:
return self._scrollbar_corner
self._scrollbar_corner = ScrollBarCorner()
self.app._start_widget(self, self._scrollbar_corner)
return self._scrollbar_corner
@property
def vertical_scrollbar(self) -> ScrollBar:
"""Get a vertical scrollbar (create if necessary).
Returns:
ScrollBar: ScrollBar Widget.
"""
from .scrollbar import ScrollBar
if self._vertical_scrollbar is not None:
return self._vertical_scrollbar
self._vertical_scrollbar = scroll_bar = ScrollBar(
vertical=True, name="vertical", thickness=self.scrollbar_size_vertical
)
self._vertical_scrollbar.display = False
self.app._start_widget(self, scroll_bar)
return scroll_bar
@property
def horizontal_scrollbar(self) -> ScrollBar:
"""Get a vertical scrollbar (create if necessary).
Returns:
ScrollBar: ScrollBar Widget.
"""
from .scrollbar import ScrollBar
if self._horizontal_scrollbar is not None:
return self._horizontal_scrollbar
self._horizontal_scrollbar = scroll_bar = ScrollBar(
vertical=False, name="horizontal", thickness=self.scrollbar_size_horizontal
)
self._horizontal_scrollbar.display = False
self.app._start_widget(self, scroll_bar)
return scroll_bar
def _refresh_scrollbars(self) -> None:
"""Refresh scrollbar visibility."""
if not self.is_scrollable:
return
styles = self.styles
overflow_x = styles.overflow_x
overflow_y = styles.overflow_y
width, height = self.container_size
show_horizontal = self.show_horizontal_scrollbar
if overflow_x == "hidden":
show_horizontal = False
if overflow_x == "scroll":
show_horizontal = True
elif overflow_x == "auto":
show_horizontal = self.virtual_size.width > width
show_vertical = self.show_vertical_scrollbar
if overflow_y == "hidden":
show_vertical = False
elif overflow_y == "scroll":
show_vertical = True
elif overflow_y == "auto":
show_vertical = self.virtual_size.height > height
if (
overflow_x == "auto"
and show_vertical
and not show_horizontal
and self._stabilized_scrollbar_size != self.container_size
):
show_horizontal = (
self.virtual_size.width + styles.scrollbar_size_vertical > width
)
self._stabilized_scrollbar_size = self.container_size
self.show_horizontal_scrollbar = show_horizontal
self.show_vertical_scrollbar = show_vertical
self.horizontal_scrollbar.display = show_horizontal
self.vertical_scrollbar.display = show_vertical
@property
def scrollbars_enabled(self) -> tuple[bool, bool]:
"""A tuple of booleans that indicate if scrollbars are enabled.
Returns:
tuple[bool, bool]: A tuple of (<vertical scrollbar enabled>, <horizontal scrollbar enabled>)
"""
if not self.is_scrollable:
return False, False
enabled = self.show_vertical_scrollbar, self.show_horizontal_scrollbar
return enabled
@property
def scrollbar_size_vertical(self) -> int:
"""Get the width used by the *vertical* scrollbar.
Returns:
int: Number of columns in the vertical scrollbar.
"""
styles = self.styles
if styles.scrollbar_gutter == "stable" and styles.overflow_y == "auto":
return styles.scrollbar_size_vertical
return styles.scrollbar_size_vertical if self.show_vertical_scrollbar else 0
@property
def scrollbar_size_horizontal(self) -> int:
"""Get the height used by the *horizontal* scrollbar.
Returns:
int: Number of rows in the horizontal scrollbar.
"""
styles = self.styles
if styles.scrollbar_gutter == "stable" and styles.overflow_x == "auto":
return styles.scrollbar_size_horizontal
return styles.scrollbar_size_horizontal if self.show_horizontal_scrollbar else 0
@property
def scrollbar_gutter(self) -> Spacing:
"""Spacing required to fit scrollbar(s).
Returns:
Spacing: Scrollbar gutter spacing.
"""
gutter = Spacing(
0, self.scrollbar_size_vertical, self.scrollbar_size_horizontal, 0
)
return gutter
@property
def gutter(self) -> Spacing:
"""Spacing for padding / border / scrollbars.
Returns:
Spacing: Additional spacing around content area.
"""
return self.styles.gutter + self.scrollbar_gutter
@property
def size(self) -> Size:
"""The size of the content area.
Returns:
Size: Content area size.
"""
return self.content_region.size
@property
def outer_size(self) -> Size:
"""The size of the widget (including padding and border).
Returns:
Size: Outer size.
"""
return self._size
@property
def container_size(self) -> Size:
"""The size of the container (parent widget).
Returns:
Size: Container size.
"""
return self._container_size
@property
def content_region(self) -> Region:
"""Gets an absolute region containing the content (minus padding and border).
Returns:
Region: Screen region that contains a widget's content.
"""
content_region = self.region.shrink(self.styles.gutter)
return content_region
@property
def content_offset(self) -> Offset:
"""An offset from the Widget origin where the content begins.
Returns:
Offset: Offset from widget's origin.
"""
x, y = self.gutter.top_left
return Offset(x, y)
@property
def content_size(self) -> Size:
"""Get the size of the content area."""
return self.region.shrink(self.styles.gutter).size
@property
def region(self) -> Region:
"""The region occupied by this widget, relative to the Screen.
Raises:
NoScreen: If there is no screen.
errors.NoWidget: If the widget is not on the screen.
Returns:
Region: Region within screen occupied by widget.
"""
try:
return self.screen.find_widget(self).region
except NoScreen:
return Region()
except errors.NoWidget:
return Region()
@property
def container_viewport(self) -> Region:
"""The viewport region (parent window).
Returns:
Region: The region that contains this widget.
"""
if self.parent is None:
return self.size.region
assert isinstance(self.parent, Widget)
return self.parent.region
@property
def virtual_region(self) -> Region:
"""The widget region relative to it's container. Which may not be visible,
depending on scroll offset.
"""
try:
return self.screen.find_widget(self).virtual_region
except NoScreen:
return Region()
except errors.NoWidget:
return Region()
@property
def window_region(self) -> Region:
"""The region within the scrollable area that is currently visible.
Returns:
Region: New region.
"""
window_region = self.region.at_offset(self.scroll_offset)
return window_region
@property
def virtual_region_with_margin(self) -> Region:
"""The widget region relative to its container (*including margin*), which may not be visible,
depending on the scroll offset.
Returns:
Region: The virtual region of the Widget, inclusive of its margin.
"""
return self.virtual_region.grow(self.styles.margin)
@property
def focusable_children(self) -> list[Widget]:
"""Get the children which may be focused.
Returns:
list[Widget]: List of widgets that can receive focus.
"""
focusable = [
child for child in self.children if child.display and child.visible
]
return sorted(focusable, key=attrgetter("_focus_sort_key"))
@property
def _focus_sort_key(self) -> tuple[int, int]:
"""Key function to sort widgets in to focus order."""
x, y, _, _ = self.virtual_region
top, _, _, left = self.styles.margin
return y - top, x - left
@property
def scroll_offset(self) -> Offset:
"""Get the current scroll offset.
Returns:
Offset: Offset a container has been scrolled by.
"""
return Offset(int(self.scroll_x), int(self.scroll_y))
@property
def is_transparent(self) -> bool:
"""Check if the background styles is not set.
Returns:
bool: ``True`` if there is background color, otherwise ``False``.
"""
return self.is_scrollable and self.styles.background.is_transparent
@property
def _console(self) -> Console:
"""Get the current console.
Returns:
Console: A Rich console object.
"""
return active_app.get().console
def animate(
self,
attribute: str,
value: float | Animatable,
*,
final_value: object = ...,
duration: float | None = None,
speed: float | None = None,
delay: float = 0.0,
easing: EasingFunction | str = DEFAULT_EASING,
on_complete: CallbackType | None = None,
) -> None:
"""Animate an attribute.
Args:
attribute (str): Name of the attribute to animate.
value (float | Animatable): The value to animate to.
final_value (object, optional): The final value of the animation. Defaults to `value` if not set.
duration (float | None, optional): The duration of the animate. Defaults to None.
speed (float | None, optional): The speed of the animation. Defaults to None.
delay (float, optional): A delay (in seconds) before the animation starts. Defaults to 0.0.
easing (EasingFunction | str, optional): An easing method. Defaults to "in_out_cubic".
on_complete (CallbackType | None, optional): A callable to invoke when the animation is finished. Defaults to None.
"""
if self._animate is None:
self._animate = self.app.animator.bind(self)
assert self._animate is not None
self._animate(
attribute,
value,
final_value=final_value,
duration=duration,
speed=speed,
delay=delay,
easing=easing,
on_complete=on_complete,
)
@property
def _layout(self) -> Layout:
"""Get the layout object if set in styles, or a default layout.
Returns:
Layout: A layout object.
"""
return self.styles.layout or self._default_layout
@property
def is_container(self) -> bool:
"""Check if this widget is a container (contains other widgets).
Returns:
bool: True if this widget is a container.
"""
return self.styles.layout is not None or bool(self.children)
@property
def is_scrollable(self) -> bool:
"""Check if this Widget may be scrolled.
Returns:
bool: True if this widget may be scrolled.
"""
return self.styles.layout is not None or bool(self.children)
@property
def layer(self) -> str:
"""Get the name of this widgets layer.
Returns:
str: Name of layer.
"""
return self.styles.layer or "default"
@property
def layers(self) -> tuple[str, ...]:
"""Layers of from parent.
Returns:
tuple[str, ...]: Tuple of layer names.
"""
for node in self.ancestors:
if not isinstance(node, Widget):
break
if node.styles.has_rule("layers"):
return node.styles.layers
return ("default",)
@property
def link_style(self) -> Style:
"""Style of links."""
styles = self.styles
_, background = self.background_colors
link_background = background + styles.link_background
link_color = link_background + (
link_background.get_contrast_text(styles.link_color.a)
if styles.auto_link_color
else styles.link_color
)
style = styles.link_style + Style.from_color(
link_color.rich_color,
link_background.rich_color,
)
return style
@property
def link_hover_style(self) -> Style:
"""Style of links with mouse hover."""
styles = self.styles
_, background = self.background_colors
hover_background = background + styles.link_hover_background
hover_color = hover_background + (
hover_background.get_contrast_text(styles.link_hover_color.a)
if styles.auto_link_hover_color
else styles.link_hover_color
)
style = styles.link_hover_style + Style.from_color(
hover_color.rich_color,
hover_background.rich_color,
)
return style
def _set_dirty(self, *regions: Region) -> None:
"""Set the Widget as 'dirty' (requiring re-paint).
Regions should be specified as positional args. If no regions are added, then
the entire widget will be considered dirty.
Args:
*regions (Region): Regions which require a repaint.
"""
if regions:
content_offset = self.content_offset
widget_regions = [region.translate(content_offset) for region in regions]
self._dirty_regions.update(widget_regions)
self._repaint_regions.update(widget_regions)
self._styles_cache.set_dirty(*widget_regions)
else:
self._dirty_regions.clear()
self._repaint_regions.clear()
self._styles_cache.clear()
self._dirty_regions.add(self.outer_size.region)
self._repaint_regions.add(self.outer_size.region)
def _exchange_repaint_regions(self) -> Collection[Region]:
"""Get a copy of the regions which need a repaint, and clear internal cache.
Returns:
Collection[Region]: Regions to repaint.
"""
regions = self._repaint_regions.copy()
self._repaint_regions.clear()
return regions
def scroll_to(
self,
x: float | None = None,
y: float | None = None,
*,
animate: bool = True,
speed: float | None = None,
duration: float | None = None,
) -> bool:
"""Scroll to a given (absolute) coordinate, optionally animating.
Args:
x (int | None, optional): X coordinate (column) to scroll to, or None for no change. Defaults to None.
y (int | None, optional): Y coordinate (row) to scroll to, or None for no change. Defaults to None.
animate (bool, optional): Animate to new scroll position. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration.
duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns:
bool: True if the scroll position changed, otherwise False.
"""
scrolled_x = scrolled_y = False
if animate:
# TODO: configure animation speed
if duration is None and speed is None:
speed = 50
if x is not None:
self.scroll_target_x = x
if x != self.scroll_x:
self.animate(
"scroll_x",
self.scroll_target_x,
speed=speed,
duration=duration,
easing="out_cubic",
)
scrolled_x = True
if y is not None:
self.scroll_target_y = y
if y != self.scroll_y:
self.animate(
"scroll_y",
self.scroll_target_y,
speed=speed,
duration=duration,
easing="out_cubic",
)
scrolled_y = True
else:
if x is not None:
scroll_x = self.scroll_x
self.scroll_target_x = self.scroll_x = x
scrolled_x = scroll_x != self.scroll_x
if y is not None:
scroll_y = self.scroll_y
self.scroll_target_y = self.scroll_y = y
scrolled_y = scroll_y != self.scroll_y
return scrolled_x or scrolled_y
def scroll_relative(
self,
x: float | None = None,
y: float | None = None,
*,
animate: bool = True,
speed: float | None = None,
duration: float | None = None,
) -> bool:
"""Scroll relative to current position.
Args:
x (int | None, optional): X distance (columns) to scroll, or ``None`` for no change. Defaults to None.
y (int | None, optional): Y distance (rows) to scroll, or ``None`` for no change. Defaults to None.
animate (bool, optional): Animate to new scroll position. Defaults to False.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration.
duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns:
bool: True if the scroll position changed, otherwise False.
"""
return self.scroll_to(
None if x is None else (self.scroll_x + x),
None if y is None else (self.scroll_y + y),
animate=animate,
speed=speed,
duration=duration,
)
def scroll_home(
self,
*,
animate: bool = True,
speed: float | None = None,
duration: float | None = None,
) -> bool:
"""Scroll to home position.
Args:
animate (bool, optional): Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration.
duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns:
bool: True if any scrolling was done.
"""
if speed is None and duration is None:
duration = 1.0
return self.scroll_to(0, 0, animate=animate, speed=speed, duration=duration)
def scroll_end(
self,
*,
animate: bool = True,
speed: float | None = None,
duration: float | None = None,
) -> bool:
"""Scroll to the end of the container.
Args:
animate (bool, optional): Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration.
duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns:
bool: True if any scrolling was done.
"""
if speed is None and duration is None:
duration = 1.0
return self.scroll_to(
0, self.max_scroll_y, animate=animate, speed=speed, duration=duration
)
def scroll_left(
self,
*,
animate: bool = True,
speed: float | None = None,
duration: float | None = None,
) -> bool:
"""Scroll one cell left.
Args:
animate (bool, optional): Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration.
duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns:
bool: True if any scrolling was done.
"""
return self.scroll_to(
x=self.scroll_target_x - 1, animate=animate, speed=speed, duration=duration
)
def scroll_right(
self,
*,
animate: bool = True,
speed: float | None = None,
duration: float | None = None,
) -> bool:
"""Scroll on cell right.
Args:
animate (bool, optional): Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration.
duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns:
bool: True if any scrolling was done.
"""
return self.scroll_to(
x=self.scroll_target_x + 1, animate=animate, speed=speed, duration=duration
)
def scroll_down(
self,
*,
animate: bool = True,
speed: float | None = None,
duration: float | None = None,
) -> bool:
"""Scroll one line down.
Args:
animate (bool, optional): Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration.
duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns:
bool: True if any scrolling was done.
"""
return self.scroll_to(
y=self.scroll_target_y + 1, animate=animate, speed=speed, duration=duration
)
def scroll_up(
self,
*,
animate: bool = True,
speed: float | None = None,
duration: float | None = None,
) -> bool:
"""Scroll one line up.
Args:
animate (bool, optional): Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration.
duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns:
bool: True if any scrolling was done.
"""
return self.scroll_to(
y=self.scroll_target_y - 1, animate=animate, speed=speed, duration=duration
)
def scroll_page_up(
self,
*,
animate: bool = True,
speed: float | None = None,
duration: float | None = None,
) -> bool:
"""Scroll one page up.
Args:
animate (bool, optional): Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration.
duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns:
bool: True if any scrolling was done.
"""
return self.scroll_to(
y=self.scroll_target_y - self.container_size.height,
animate=animate,
speed=speed,
duration=duration,
)
def scroll_page_down(
self,
*,
animate: bool = True,
speed: float | None = None,
duration: float | None = None,
) -> bool:
"""Scroll one page down.
Args:
animate (bool, optional): Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration.
duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns:
bool: True if any scrolling was done.
"""
return self.scroll_to(
y=self.scroll_target_y + self.container_size.height,
animate=animate,
speed=speed,
duration=duration,
)
def scroll_page_left(
self,
*,
animate: bool = True,
speed: float | None = None,
duration: float | None = None,
) -> bool:
"""Scroll one page left.
Args:
animate (bool, optional): Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration.
duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns:
bool: True if any scrolling was done.
"""
if speed is None and duration is None:
duration = 0.3
return self.scroll_to(
x=self.scroll_target_x - self.container_size.width,
animate=animate,
speed=speed,
duration=duration,
)
def scroll_page_right(
self,
*,
animate: bool = True,
speed: float | None = None,
duration: float | None = None,
) -> bool:
"""Scroll one page right.
Args:
animate (bool, optional): Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration.
duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns:
bool: True if any scrolling was done.
"""
if speed is None and duration is None:
duration = 0.3
return self.scroll_to(
x=self.scroll_target_x + self.container_size.width,
animate=animate,
speed=speed,
duration=duration,
)
def scroll_to_widget(
self,
widget: Widget,
*,
animate: bool = True,
speed: float | None = None,
duration: float | None = None,
top: bool = False,
) -> bool:
"""Scroll scrolling to bring a widget in to view.
Args:
widget (Widget): A descendant widget.
animate (bool, optional): True to animate, or False to jump. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration.
duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns:
bool: True if any scrolling has occurred in any descendant, otherwise False.
"""
# Grow the region by the margin so to keep the margin in view.
region = widget.virtual_region_with_margin
scrolled = False
while isinstance(widget.parent, Widget) and widget is not self:
container = widget.parent
scroll_offset = container.scroll_to_region(
region,
spacing=widget.parent.gutter,
animate=animate,
speed=speed,
duration=duration,
top=top,
)
if scroll_offset:
scrolled = True
# Adjust the region by the amount we just scrolled it, and convert to
# it's parent's virtual coordinate system.
region = (
(
region.translate(-scroll_offset)
.translate(-widget.scroll_offset)
.translate(container.virtual_region.offset)
)
.grow(container.styles.margin)
.intersection(container.virtual_region)
)
widget = container
return scrolled
def scroll_to_region(
self,
region: Region,
*,
spacing: Spacing | None = None,
animate: bool = True,
speed: float | None = None,
duration: float | None = None,
top: bool = False,
) -> Offset:
"""Scrolls a given region in to view, if required.
This method will scroll the least distance required to move `region` fully within
the scrollable area.
Args:
region (Region): A region that should be visible.
spacing (Spacing | None, optional): Optional spacing around the region. Defaults to None.
animate (bool, optional): True to animate, or False to jump. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration.
duration (float | None, optional): Duration of animation, if animate is True and speed is None.
top (bool, optional): Scroll region to top of container. Defaults to False.
Returns:
Offset: The distance that was scrolled.
"""
window = self.content_region.at_offset(self.scroll_offset)
if spacing is not None:
window = window.shrink(spacing)
if window in region:
return Offset()
delta_x, delta_y = Region.get_scroll_to_visible(window, region, top=top)
scroll_x, scroll_y = self.scroll_offset
delta = Offset(
clamp(scroll_x + delta_x, 0, self.max_scroll_x) - scroll_x,
clamp(scroll_y + delta_y, 0, self.max_scroll_y) - scroll_y,
)
if delta:
if speed is None and duration is None:
duration = 0.2
self.scroll_relative(
delta.x or None,
delta.y or None,
animate=animate if (abs(delta_y) > 1 or delta_x) else False,
speed=speed,
duration=duration,
)
return delta
def scroll_visible(
self,
animate: bool = True,
*,
speed: float | None = None,
duration: float | None = None,
top: bool = False,
) -> None:
"""Scroll the container to make this widget visible.
Args:
animate (bool, optional): _description_. Defaults to True.
speed (float | None, optional): _description_. Defaults to None.
duration (float | None, optional): _description_. Defaults to None.
top (bool, optional): Scroll to top of container. Defaults to False.
"""
parent = self.parent
if isinstance(parent, Widget):
self.call_later(
parent.scroll_to_widget,
self,
animate=animate,
speed=speed,
duration=duration,
top=top,
)
def __init_subclass__(
cls,
can_focus: bool | None = None,
can_focus_children: bool | None = None,
inherit_css: bool = True,
) -> None:
base = cls.__mro__[0]
super().__init_subclass__(inherit_css=inherit_css)
if issubclass(base, Widget):
cls.can_focus = base.can_focus if can_focus is None else can_focus
cls.can_focus_children = (
base.can_focus_children
if can_focus_children is None
else can_focus_children
)
def __rich_repr__(self) -> rich.repr.Result:
yield "id", self.id, None
if self.name:
yield "name", self.name
if self.classes:
yield "classes", set(self.classes)
pseudo_classes = self.pseudo_classes
if pseudo_classes:
yield "pseudo_classes", set(pseudo_classes)
def _get_scrollable_region(self, region: Region) -> Region:
"""Adjusts the Widget region to accommodate scrollbars.
Args:
region (Region): A region for the widget.
Returns:
Region: The widget region minus scrollbars.
"""
show_vertical_scrollbar, show_horizontal_scrollbar = self.scrollbars_enabled
scrollbar_size_horizontal = self.styles.scrollbar_size_horizontal
scrollbar_size_vertical = self.styles.scrollbar_size_vertical
if self.styles.scrollbar_gutter == "stable":
# Let's _always_ reserve some space, whether the scrollbar is actually displayed or not:
show_vertical_scrollbar = True
scrollbar_size_vertical = self.styles.scrollbar_size_vertical
if show_horizontal_scrollbar and show_vertical_scrollbar:
(region, _, _, _) = region.split(
-scrollbar_size_vertical,
-scrollbar_size_horizontal,
)
elif show_vertical_scrollbar:
region, _ = region.split_vertical(-scrollbar_size_vertical)
elif show_horizontal_scrollbar:
region, _ = region.split_horizontal(-scrollbar_size_horizontal)
return region
def _arrange_scrollbars(self, region: Region) -> Iterable[tuple[Widget, Region]]:
"""Arrange the 'chrome' widgets (typically scrollbars) for a layout element.
Args:
region (Region): The containing region.
Returns:
Iterable[tuple[Widget, Region]]: Tuples of scrollbar Widget and region.
"""
show_vertical_scrollbar, show_horizontal_scrollbar = self.scrollbars_enabled
scrollbar_size_horizontal = self.scrollbar_size_horizontal
scrollbar_size_vertical = self.scrollbar_size_vertical
if show_horizontal_scrollbar and show_vertical_scrollbar:
(
_,
vertical_scrollbar_region,
horizontal_scrollbar_region,
scrollbar_corner_gap,
) = region.split(
-scrollbar_size_vertical,
-scrollbar_size_horizontal,
)
if scrollbar_corner_gap:
yield self.scrollbar_corner, scrollbar_corner_gap
if vertical_scrollbar_region:
yield self.vertical_scrollbar, vertical_scrollbar_region
if horizontal_scrollbar_region:
yield self.horizontal_scrollbar, horizontal_scrollbar_region
elif show_vertical_scrollbar:
_, scrollbar_region = region.split_vertical(-scrollbar_size_vertical)
if scrollbar_region:
yield self.vertical_scrollbar, scrollbar_region
elif show_horizontal_scrollbar:
_, scrollbar_region = region.split_horizontal(-scrollbar_size_horizontal)
if scrollbar_region:
yield self.horizontal_scrollbar, scrollbar_region
def get_pseudo_classes(self) -> Iterable[str]:
"""Pseudo classes for a widget.
Returns:
Iterable[str]: Names of the pseudo classes.
"""
if self.mouse_over:
yield "hover"
if self.has_focus:
yield "focus"
try:
focused = self.screen.focused
except NoScreen:
pass
else:
if focused:
node = focused
while node is not None:
if node is self:
yield "focus-within"
break
node = node._parent
def post_render(self, renderable: RenderableType) -> ConsoleRenderable:
"""Applies style attributes to the default renderable.
Returns:
RenderableType: A new renderable.
"""
text_justify: JustifyMethod | None = None
if self.styles.has_rule("text_align"):
text_align: JustifyMethod = cast(JustifyMethod, self.styles.text_align)
text_justify = _JUSTIFY_MAP.get(text_align, text_align)
if isinstance(renderable, str):
renderable = Text.from_markup(renderable, justify=text_justify)
if (
isinstance(renderable, Text)
and text_justify is not None
and renderable.justify is None
):
renderable.justify = text_justify
renderable = _Styled(
renderable, self.rich_style, self.link_style if self.auto_links else None
)
return renderable
def watch_mouse_over(self, value: bool) -> None:
"""Update from CSS if mouse over state changes."""
if self._has_hover_style:
self.app.update_styles(self)
def watch_has_focus(self, value: bool) -> None:
"""Update from CSS if has focus state changes."""
self.app.update_styles(self)
def _size_updated(
self, size: Size, virtual_size: Size, container_size: Size
) -> None:
"""Called when the widget's size is updated.
Args:
size (Size): Screen size.
virtual_size (Size): Virtual (scrollable) size.
container_size (Size): Container size (size of parent).
"""
if (
self._size != size
or self.virtual_size != virtual_size
or self._container_size != container_size
):
self._size = size
self.virtual_size = virtual_size
self._container_size = container_size
if self.is_scrollable:
self._scroll_update(virtual_size)
self.refresh()
def _scroll_update(self, virtual_size: Size) -> None:
"""Update scrollbars visibility and dimensions.
Args:
virtual_size (Size): Virtual size.
"""
self._refresh_scrollbars()
width, height = self.container_size
if self.show_vertical_scrollbar:
self.vertical_scrollbar.window_virtual_size = virtual_size.height
self.vertical_scrollbar.window_size = (
height - self.scrollbar_size_horizontal
)
if self.show_horizontal_scrollbar:
self.horizontal_scrollbar.window_virtual_size = virtual_size.width
self.horizontal_scrollbar.window_size = width - self.scrollbar_size_vertical
self.scroll_x = self.validate_scroll_x(self.scroll_x)
self.scroll_y = self.validate_scroll_y(self.scroll_y)
def _render_content(self) -> None:
"""Render all lines."""
width, height = self.size
renderable = self.render()
renderable = self.post_render(renderable)
options = self._console.options.update_dimensions(width, height).update(
highlight=False
)
segments = self._console.render(renderable, options)
lines = list(
islice(
Segment.split_and_crop_lines(
segments, width, include_new_lines=False, pad=False
),
None,
height,
)
)
styles = self.styles
align_horizontal, align_vertical = styles.content_align
lines = list(
align_lines(
lines,
Style(),
self.size,
align_horizontal,
align_vertical,
)
)
self._render_cache = RenderCache(self.size, lines)
self._dirty_regions.clear()
def render_line(self, y: int) -> list[Segment]:
"""Render a line of content.
Args:
y (int): Y Coordinate of line.
Returns:
list[Segment]: A rendered line.
"""
if self._dirty_regions:
self._render_content()
try:
line = self._render_cache.lines[y]
except IndexError:
line = [Segment(" " * self.size.width, self.rich_style)]
return line
def render_lines(self, crop: Region) -> Lines:
"""Render the widget in to lines.
Args:
crop (Region): Region within visible area to render.
Returns:
Lines: A list of list of segments.
"""
lines = self._styles_cache.render_widget(self, crop)
return lines
def get_style_at(self, x: int, y: int) -> Style:
"""Get the Rich style in a widget at a given relative offset.
Args:
x (int): X coordinate relative to the widget.
y (int): Y coordinate relative to the widget.
Returns:
Style: A rich Style object.
"""
offset = Offset(x, y)
screen_offset = offset + self.region.offset
widget, _ = self.screen.get_widget_at(*screen_offset)
if widget is not self:
return Style()
return self.screen.get_style_at(*screen_offset)
async def _forward_event(self, event: events.Event) -> None:
event._set_forwarded()
await self.post_message(event)
def refresh(
self, *regions: Region, repaint: bool = True, layout: bool = False
) -> None:
"""Initiate a refresh of the widget.
This method sets an internal flag to perform a refresh, which will be done on the
next idle event. Only one refresh will be done even if this method is called multiple times.
By default this method will cause the content of the widget to refresh, but not change its size. You can also
set `layout=True` to perform a layout.
!!! warning
It is rarely necessary to call this method explicitly. Updating styles or reactive attributes will
do this automatically.
Args:
*regions (Region, optional): Additional screen regions to mark as dirty.
repaint (bool, optional): Repaint the widget (will call render() again). Defaults to True.
layout (bool, optional): Also layout widgets in the view. Defaults to False.
"""
if layout:
self._layout_required = True
if isinstance(self._parent, Widget):
self._parent._clear_arrangement_cache()
if repaint:
self._set_dirty(*regions)
self._content_width_cache = (None, 0)
self._content_height_cache = (None, 0)
self._rich_style_cache.clear()
self._repaint_required = True
self.check_idle()
def remove(self) -> None:
"""Remove the Widget from the DOM (effectively deleting it)"""
self.app.post_message_no_wait(events.Remove(self, widget=self))
def render(self) -> RenderableType:
"""Get renderable for widget.
Returns:
RenderableType: Any renderable
"""
render = "" if self.is_container else self.css_identifier_styled
return render
def _render(self) -> ConsoleRenderable | RichCast:
"""Get renderable, promoting str to text as required.
Returns:
ConsoleRenderable | RichCast: A renderable
"""
renderable = self.render()
if isinstance(renderable, str):
return Text(renderable)
return renderable
async def action(self, action: str) -> None:
"""Perform a given action, with this widget as the default namespace.
Args:
action (str): Action encoded as a string.
"""
await self.app.action(action, self)
async def post_message(self, message: Message) -> bool:
"""Post a message to this widget.
Args:
message (Message): Message to post.
Returns:
bool: True if the message was posted, False if this widget was closed / closing.
"""
if not self.check_message_enabled(message):
return True
if not self.is_running:
self.log.warning(self, f"IS NOT RUNNING, {message!r} not sent")
return await super().post_message(message)
async def _on_idle(self, event: events.Idle) -> None:
"""Called when there are no more events on the queue.
Args:
event (events.Idle): Idle event.
"""
if self._parent is not None and not self._closing:
try:
screen = self.screen
except NoScreen:
pass
else:
if self._repaint_required:
self._repaint_required = False
screen.post_message_no_wait(messages.Update(self, self))
if self._layout_required:
self._layout_required = False
screen.post_message_no_wait(messages.Layout(self))
def focus(self, scroll_visible: bool = True) -> None:
"""Give focus to this widget.
Args:
scroll_visible (bool, optional): Scroll parent to make this widget
visible. Defaults to True.
"""
def set_focus(widget: Widget):
"""Callback to set the focus."""
try:
widget.screen.set_focus(self, scroll_visible=scroll_visible)
except NoScreen:
pass
self.app.call_later(set_focus, self)
def reset_focus(self) -> None:
"""Reset the focus (move it to the next available widget)."""
try:
self.screen._reset_focus(self)
except NoScreen:
pass
def capture_mouse(self, capture: bool = True) -> None:
"""Capture (or release) the mouse.
When captured, mouse events will go to this widget even when the pointer is not directly over the widget.
Args:
capture (bool, optional): True to capture or False to release. Defaults to True.
"""
self.app.capture_mouse(self if capture else None)
def release_mouse(self) -> None:
"""Release the mouse.
Mouse events will only be sent when the mouse is over the widget.
"""
self.app.capture_mouse(None)
async def broker_event(self, event_name: str, event: events.Event) -> bool:
return await self.app._broker_event(event_name, event, default_namespace=self)
def _on_styles_updated(self) -> None:
self._rich_style_cache.clear()
async def _on_mouse_down(self, event: events.MouseUp) -> None:
await self.broker_event("mouse.down", event)
async def _on_mouse_up(self, event: events.MouseUp) -> None:
await self.broker_event("mouse.up", event)
async def _on_click(self, event: events.Click) -> None:
await self.broker_event("click", event)
async def _on_key(self, event: events.Key) -> None:
await self.handle_key(event)
async def handle_key(self, event: events.Key) -> bool:
return await self.dispatch_key(event)
async def _on_compose(self, event: events.Compose) -> None:
widgets = list(self.compose())
await self.mount(*widgets)
def _on_mount(self, event: events.Mount) -> None:
if self.styles.overflow_y == "scroll":
self.show_vertical_scrollbar = True
if self.styles.overflow_x == "scroll":
self.show_horizontal_scrollbar = True
def _on_leave(self, event: events.Leave) -> None:
self.mouse_over = False
self.hover_style = Style()
def _on_enter(self, event: events.Enter) -> None:
self.mouse_over = True
def _on_focus(self, event: events.Focus) -> None:
for node in self.ancestors:
if node._has_focus_within:
self.app.update_styles(node)
self.has_focus = True
self.refresh()
def _on_blur(self, event: events.Blur) -> None:
if any(node._has_focus_within for node in self.ancestors):
self.app.update_styles(self)
self.has_focus = False
self.refresh()
def _on_mouse_scroll_down(self, event) -> None:
if self.allow_vertical_scroll:
if self.scroll_down(animate=False):
event.stop()
def _on_mouse_scroll_up(self, event) -> None:
if self.allow_vertical_scroll:
if self.scroll_up(animate=False):
event.stop()
def _on_scroll_to(self, message: ScrollTo) -> None:
if self._allow_scroll:
self.scroll_to(message.x, message.y, animate=message.animate, duration=0.1)
message.stop()
def _on_scroll_up(self, event: ScrollUp) -> None:
if self.allow_vertical_scroll:
self.scroll_page_up()
event.stop()
def _on_scroll_down(self, event: ScrollDown) -> None:
if self.allow_vertical_scroll:
self.scroll_page_down()
event.stop()
def _on_scroll_left(self, event: ScrollLeft) -> None:
if self.allow_horizontal_scroll:
self.scroll_page_left()
event.stop()
def _on_scroll_right(self, event: ScrollRight) -> None:
if self.allow_horizontal_scroll:
self.scroll_page_right()
event.stop()
def _on_hide(self, event: events.Hide) -> None:
if self.has_focus:
self.reset_focus()
def _on_scroll_to_region(self, message: messages.ScrollToRegion) -> None:
self.scroll_to_region(message.region, animate=True)
def _key_home(self) -> bool:
if self._allow_scroll:
self.scroll_home()
return True
return False
def _key_end(self) -> bool:
if self._allow_scroll:
self.scroll_end()
return True
return False
def _key_left(self) -> bool:
if self.allow_horizontal_scroll:
self.scroll_left()
return True
return False
def _key_right(self) -> bool:
if self.allow_horizontal_scroll:
self.scroll_right()
return True
return False
def _key_down(self) -> bool:
if self.allow_vertical_scroll:
self.scroll_down()
return True
return False
def _key_up(self) -> bool:
if self.allow_vertical_scroll:
self.scroll_up()
return True
return False
def _key_pagedown(self) -> bool:
if self.allow_vertical_scroll:
self.scroll_page_down()
return True
return False
def _key_pageup(self) -> bool:
if self.allow_vertical_scroll:
self.scroll_page_up()
return True
return False
Classes
class AwaitMount (widgets: Sequence[Widget])
-
An awaitable returned by mount() and mount_all().
Example
await self.mount(Static("foo"))
Expand source code
class AwaitMount: """An awaitable returned by mount() and mount_all(). Example: await self.mount(Static("foo")) """ def __init__(self, widgets: Sequence[Widget]) -> None: self._widgets = widgets def __await__(self) -> Generator[None, None, None]: async def await_mount() -> None: aws = [ create_task(widget._mounted_event.wait()) for widget in self._widgets ] if aws: await wait(aws) return await_mount().__await__()
class RenderCache (size: Size, lines: Lines)
-
Stores results of a previous render.
Expand source code
class RenderCache(NamedTuple): """Stores results of a previous render.""" size: Size lines: Lines
Ancestors
- builtins.tuple
Instance variables
var lines : List[List[rich.segment.Segment]]
-
Alias for field number 1
var size : Size
-
Alias for field number 0
class Widget (*children: Widget, name: str | None = None, id: str | None = None, classes: str | None = None)
-
A Widget is the base class for Textual widgets.
See also [static][textual.widgets._static.Static] for starting point for your own widgets.
Expand source code
class Widget(DOMNode): """ A Widget is the base class for Textual widgets. See also [static][textual.widgets._static.Static] for starting point for your own widgets. """ DEFAULT_CSS = """ Widget{ scrollbar-background: $panel-darken-1; scrollbar-background-hover: $panel-darken-2; scrollbar-color: $primary-lighten-1; scrollbar-color-active: $warning-darken-1; scrollbar-corner-color: $panel-darken-1; scrollbar-size-vertical: 2; scrollbar-size-horizontal: 1; link-background:; link-color: $text; link-style: underline; link-hover-background: $accent; link-hover-color: $text; link-hover-style: bold not underline; } """ COMPONENT_CLASSES: ClassVar[set[str]] = set() can_focus: bool = False """Widget may receive focus.""" can_focus_children: bool = True """Widget's children may receive focus.""" expand = Reactive(False) """Rich renderable may expand.""" shrink = Reactive(True) """Rich renderable may shrink.""" auto_links = Reactive(True) """Widget will highlight links automatically.""" hover_style: Reactive[Style] = Reactive(Style, repaint=False) highlight_link_id: Reactive[str] = Reactive("") def __init__( self, *children: Widget, name: str | None = None, id: str | None = None, classes: str | None = None, ) -> None: self._size = Size(0, 0) self._container_size = Size(0, 0) self._layout_required = False self._repaint_required = False self._default_layout = VerticalLayout() self._animate: BoundAnimator | None = None self.highlight_style: Style | None = None self._vertical_scrollbar: ScrollBar | None = None self._horizontal_scrollbar: ScrollBar | None = None self._scrollbar_corner: ScrollBarCorner | None = None self._render_cache = RenderCache(Size(0, 0), []) # Regions which need to be updated (in Widget) self._dirty_regions: set[Region] = set() # Regions which need to be transferred from cache to screen self._repaint_regions: set[Region] = set() # Cache the auto content dimensions # TODO: add mechanism to explicitly clear this self._content_width_cache: tuple[object, int] = (None, 0) self._content_height_cache: tuple[object, int] = (None, 0) self._arrangement: DockArrangeResult | None = None self._arrangement_cache_key: tuple[int, Size] = (-1, Size()) self._styles_cache = StylesCache() self._rich_style_cache: dict[str, Style] = {} self._stabilized_scrollbar_size: Size | None = None self._lock = Lock() super().__init__( name=name, id=id, classes=self.DEFAULT_CLASSES if classes is None else classes, ) self._add_children(*children) virtual_size = Reactive(Size(0, 0), layout=True) auto_width = Reactive(True) auto_height = Reactive(True) has_focus = Reactive(False) mouse_over = Reactive(False) scroll_x = Reactive(0.0, repaint=False, layout=False) scroll_y = Reactive(0.0, repaint=False, layout=False) scroll_target_x = Reactive(0.0, repaint=False) scroll_target_y = Reactive(0.0, repaint=False) show_vertical_scrollbar = Reactive(False, layout=True) show_horizontal_scrollbar = Reactive(False, layout=True) @property def siblings(self) -> list[Widget]: """Get the widget's siblings (self is removed from the return list). Returns: list[Widget]: A list of siblings. """ parent = self.parent if parent is not None: siblings = list(parent.children) siblings.remove(self) return siblings else: return [] @property def visible_siblings(self) -> list[Widget]: """A list of siblings which will be shown. Returns: list[Widget]: List of siblings. """ siblings = [ widget for widget in self.siblings if widget.visible and widget.display ] return siblings @property def allow_vertical_scroll(self) -> bool: """Check if vertical scroll is permitted. May be overridden if you want different logic regarding allowing scrolling. Returns: bool: True if the widget may scroll _vertically_. """ return self.is_scrollable and self.show_vertical_scrollbar @property def allow_horizontal_scroll(self) -> bool: """Check if horizontal scroll is permitted. May be overridden if you want different logic regarding allowing scrolling. Returns: bool: True if the widget may scroll _horizontally_. """ return self.is_scrollable and self.show_horizontal_scrollbar @property def _allow_scroll(self) -> bool: """Check if both axis may be scrolled. Returns: bool: True if horizontal and vertical scrolling is enabled. """ return self.is_scrollable and ( self.allow_horizontal_scroll or self.allow_vertical_scroll ) @property def offset(self) -> Offset: """Widget offset from origin. Returns: Offset: Relative offset. """ return self.styles.offset.resolve(self.size, self.app.size) @offset.setter def offset(self, offset: Offset) -> None: self.styles.offset = ScalarOffset.from_offset(offset) def get_component_rich_style(self, name: str) -> Style: """Get a *Rich* style for a component. Args: name (str): Name of component. Returns: Style: A Rich style object. """ style = self._rich_style_cache.get(name) if style is None: style = self.get_component_styles(name).rich_style self._rich_style_cache[name] = style return style def _arrange(self, size: Size) -> DockArrangeResult: """Arrange children. Args: size (Size): Size of container. Returns: ArrangeResult: Widget locations. """ arrange_cache_key = (self.children._updates, size) if ( self._arrangement is not None and arrange_cache_key == self._arrangement_cache_key ): return self._arrangement self._arrangement_cache_key = arrange_cache_key self._arrangement = arrange(self, self.children, size, self.screen.size) return self._arrangement def _clear_arrangement_cache(self) -> None: """Clear arrangement cache, forcing a new arrange operation.""" self._arrangement = None def mount(self, *anon_widgets: Widget, **widgets: Widget) -> AwaitMount: """Mount child widgets (making this widget a container). Widgets may be passed as positional arguments or keyword arguments. If keyword arguments, the keys will be set as the Widget's id. Example: ```python self.mount(Static("hello"), header=Header()) ``` Returns: AwaitMount: An awaitable object that waits for widgets to be mounted. """ mounted_widgets = self.app._register(self, *anon_widgets, **widgets) return AwaitMount(mounted_widgets) def compose(self) -> ComposeResult: """Called by Textual to create child widgets. Extend this to build a UI. Example: ```python def compose(self) -> ComposeResult: yield Header() yield Container( TreeControl(), Viewer() ) yield Footer() ``` """ return yield def _post_register(self, app: App) -> None: """Called when the instance is registered. Args: app (App): App instance. """ # Parse the Widget's CSS for path, css, tie_breaker in self.get_default_css(): self.app.stylesheet.add_source( css, path=path, is_default_css=True, tie_breaker=tie_breaker ) def _get_box_model( self, container: Size, viewport: Size, fraction_unit: Fraction ) -> BoxModel: """Process the box model for this widget. Args: container (Size): The size of the container widget (with a layout) viewport (Size): The viewport size. fraction_unit (Fraction): The unit used for `fr` units. Returns: BoxModel: The size and margin for this widget. """ box_model = get_box_model( self.styles, container, viewport, fraction_unit, self.get_content_width, self.get_content_height, ) return box_model def get_content_width(self, container: Size, viewport: Size) -> int: """Called by textual to get the width of the content area. May be overridden in a subclass. Args: container (Size): Size of the container (immediate parent) widget. viewport (Size): Size of the viewport. Returns: int: The optimal width of the content. """ if self.is_container: assert self._layout is not None return self._layout.get_content_width(self, container, viewport) cache_key = container.width if self._content_width_cache[0] == cache_key: return self._content_width_cache[1] console = self.app.console renderable = self._render() width = measure(console, renderable, container.width) if self.expand: width = max(container.width, width) if self.shrink: width = min(width, container.width) self._content_width_cache = (cache_key, width) return width def get_content_height(self, container: Size, viewport: Size, width: int) -> int: """Called by Textual to get the height of the content area. May be overridden in a subclass. Args: container (Size): Size of the container (immediate parent) widget. viewport (Size): Size of the viewport. width (int): Width of renderable. Returns: int: The height of the content. """ if self.is_container: assert self._layout is not None height = ( self._layout.get_content_height( self, container, viewport, width, ) + self.scrollbar_size_horizontal ) else: cache_key = width if self._content_height_cache[0] == cache_key: return self._content_height_cache[1] renderable = self.render() options = self._console.options.update_width(width).update(highlight=False) segments = self._console.render(renderable, options) # Cheaper than counting the lines returned from render_lines! height = sum(text.count("\n") for text, _, _ in segments) self._content_height_cache = (cache_key, height) return height def watch_hover_style( self, previous_hover_style: Style, hover_style: Style ) -> None: if self.auto_links: self.highlight_link_id = hover_style.link_id def watch_scroll_x(self, new_value: float) -> None: if self.show_horizontal_scrollbar: self.horizontal_scrollbar.position = int(new_value) self.horizontal_scrollbar.refresh() self.refresh(layout=True) def watch_scroll_y(self, new_value: float) -> None: if self.show_vertical_scrollbar: self.vertical_scrollbar.position = int(new_value) self.vertical_scrollbar.refresh() self.refresh(layout=True) def validate_scroll_x(self, value: float) -> float: return clamp(value, 0, self.max_scroll_x) def validate_scroll_target_x(self, value: float) -> float: return clamp(value, 0, self.max_scroll_x) def validate_scroll_y(self, value: float) -> float: return clamp(value, 0, self.max_scroll_y) def validate_scroll_target_y(self, value: float) -> float: return clamp(value, 0, self.max_scroll_y) @property def max_scroll_x(self) -> int: """The maximum value of `scroll_x`.""" return max( 0, self.virtual_size.width - self.container_size.width + self.scrollbar_size_vertical, ) @property def max_scroll_y(self) -> int: """The maximum value of `scroll_y`.""" return max( 0, self.virtual_size.height - self.container_size.height + self.scrollbar_size_horizontal, ) @property def scrollbar_corner(self) -> ScrollBarCorner: """Return the ScrollBarCorner - the cells that appear between the horizontal and vertical scrollbars (only when both are visible). """ from .scrollbar import ScrollBarCorner if self._scrollbar_corner is not None: return self._scrollbar_corner self._scrollbar_corner = ScrollBarCorner() self.app._start_widget(self, self._scrollbar_corner) return self._scrollbar_corner @property def vertical_scrollbar(self) -> ScrollBar: """Get a vertical scrollbar (create if necessary). Returns: ScrollBar: ScrollBar Widget. """ from .scrollbar import ScrollBar if self._vertical_scrollbar is not None: return self._vertical_scrollbar self._vertical_scrollbar = scroll_bar = ScrollBar( vertical=True, name="vertical", thickness=self.scrollbar_size_vertical ) self._vertical_scrollbar.display = False self.app._start_widget(self, scroll_bar) return scroll_bar @property def horizontal_scrollbar(self) -> ScrollBar: """Get a vertical scrollbar (create if necessary). Returns: ScrollBar: ScrollBar Widget. """ from .scrollbar import ScrollBar if self._horizontal_scrollbar is not None: return self._horizontal_scrollbar self._horizontal_scrollbar = scroll_bar = ScrollBar( vertical=False, name="horizontal", thickness=self.scrollbar_size_horizontal ) self._horizontal_scrollbar.display = False self.app._start_widget(self, scroll_bar) return scroll_bar def _refresh_scrollbars(self) -> None: """Refresh scrollbar visibility.""" if not self.is_scrollable: return styles = self.styles overflow_x = styles.overflow_x overflow_y = styles.overflow_y width, height = self.container_size show_horizontal = self.show_horizontal_scrollbar if overflow_x == "hidden": show_horizontal = False if overflow_x == "scroll": show_horizontal = True elif overflow_x == "auto": show_horizontal = self.virtual_size.width > width show_vertical = self.show_vertical_scrollbar if overflow_y == "hidden": show_vertical = False elif overflow_y == "scroll": show_vertical = True elif overflow_y == "auto": show_vertical = self.virtual_size.height > height if ( overflow_x == "auto" and show_vertical and not show_horizontal and self._stabilized_scrollbar_size != self.container_size ): show_horizontal = ( self.virtual_size.width + styles.scrollbar_size_vertical > width ) self._stabilized_scrollbar_size = self.container_size self.show_horizontal_scrollbar = show_horizontal self.show_vertical_scrollbar = show_vertical self.horizontal_scrollbar.display = show_horizontal self.vertical_scrollbar.display = show_vertical @property def scrollbars_enabled(self) -> tuple[bool, bool]: """A tuple of booleans that indicate if scrollbars are enabled. Returns: tuple[bool, bool]: A tuple of (<vertical scrollbar enabled>, <horizontal scrollbar enabled>) """ if not self.is_scrollable: return False, False enabled = self.show_vertical_scrollbar, self.show_horizontal_scrollbar return enabled @property def scrollbar_size_vertical(self) -> int: """Get the width used by the *vertical* scrollbar. Returns: int: Number of columns in the vertical scrollbar. """ styles = self.styles if styles.scrollbar_gutter == "stable" and styles.overflow_y == "auto": return styles.scrollbar_size_vertical return styles.scrollbar_size_vertical if self.show_vertical_scrollbar else 0 @property def scrollbar_size_horizontal(self) -> int: """Get the height used by the *horizontal* scrollbar. Returns: int: Number of rows in the horizontal scrollbar. """ styles = self.styles if styles.scrollbar_gutter == "stable" and styles.overflow_x == "auto": return styles.scrollbar_size_horizontal return styles.scrollbar_size_horizontal if self.show_horizontal_scrollbar else 0 @property def scrollbar_gutter(self) -> Spacing: """Spacing required to fit scrollbar(s). Returns: Spacing: Scrollbar gutter spacing. """ gutter = Spacing( 0, self.scrollbar_size_vertical, self.scrollbar_size_horizontal, 0 ) return gutter @property def gutter(self) -> Spacing: """Spacing for padding / border / scrollbars. Returns: Spacing: Additional spacing around content area. """ return self.styles.gutter + self.scrollbar_gutter @property def size(self) -> Size: """The size of the content area. Returns: Size: Content area size. """ return self.content_region.size @property def outer_size(self) -> Size: """The size of the widget (including padding and border). Returns: Size: Outer size. """ return self._size @property def container_size(self) -> Size: """The size of the container (parent widget). Returns: Size: Container size. """ return self._container_size @property def content_region(self) -> Region: """Gets an absolute region containing the content (minus padding and border). Returns: Region: Screen region that contains a widget's content. """ content_region = self.region.shrink(self.styles.gutter) return content_region @property def content_offset(self) -> Offset: """An offset from the Widget origin where the content begins. Returns: Offset: Offset from widget's origin. """ x, y = self.gutter.top_left return Offset(x, y) @property def content_size(self) -> Size: """Get the size of the content area.""" return self.region.shrink(self.styles.gutter).size @property def region(self) -> Region: """The region occupied by this widget, relative to the Screen. Raises: NoScreen: If there is no screen. errors.NoWidget: If the widget is not on the screen. Returns: Region: Region within screen occupied by widget. """ try: return self.screen.find_widget(self).region except NoScreen: return Region() except errors.NoWidget: return Region() @property def container_viewport(self) -> Region: """The viewport region (parent window). Returns: Region: The region that contains this widget. """ if self.parent is None: return self.size.region assert isinstance(self.parent, Widget) return self.parent.region @property def virtual_region(self) -> Region: """The widget region relative to it's container. Which may not be visible, depending on scroll offset. """ try: return self.screen.find_widget(self).virtual_region except NoScreen: return Region() except errors.NoWidget: return Region() @property def window_region(self) -> Region: """The region within the scrollable area that is currently visible. Returns: Region: New region. """ window_region = self.region.at_offset(self.scroll_offset) return window_region @property def virtual_region_with_margin(self) -> Region: """The widget region relative to its container (*including margin*), which may not be visible, depending on the scroll offset. Returns: Region: The virtual region of the Widget, inclusive of its margin. """ return self.virtual_region.grow(self.styles.margin) @property def focusable_children(self) -> list[Widget]: """Get the children which may be focused. Returns: list[Widget]: List of widgets that can receive focus. """ focusable = [ child for child in self.children if child.display and child.visible ] return sorted(focusable, key=attrgetter("_focus_sort_key")) @property def _focus_sort_key(self) -> tuple[int, int]: """Key function to sort widgets in to focus order.""" x, y, _, _ = self.virtual_region top, _, _, left = self.styles.margin return y - top, x - left @property def scroll_offset(self) -> Offset: """Get the current scroll offset. Returns: Offset: Offset a container has been scrolled by. """ return Offset(int(self.scroll_x), int(self.scroll_y)) @property def is_transparent(self) -> bool: """Check if the background styles is not set. Returns: bool: ``True`` if there is background color, otherwise ``False``. """ return self.is_scrollable and self.styles.background.is_transparent @property def _console(self) -> Console: """Get the current console. Returns: Console: A Rich console object. """ return active_app.get().console def animate( self, attribute: str, value: float | Animatable, *, final_value: object = ..., duration: float | None = None, speed: float | None = None, delay: float = 0.0, easing: EasingFunction | str = DEFAULT_EASING, on_complete: CallbackType | None = None, ) -> None: """Animate an attribute. Args: attribute (str): Name of the attribute to animate. value (float | Animatable): The value to animate to. final_value (object, optional): The final value of the animation. Defaults to `value` if not set. duration (float | None, optional): The duration of the animate. Defaults to None. speed (float | None, optional): The speed of the animation. Defaults to None. delay (float, optional): A delay (in seconds) before the animation starts. Defaults to 0.0. easing (EasingFunction | str, optional): An easing method. Defaults to "in_out_cubic". on_complete (CallbackType | None, optional): A callable to invoke when the animation is finished. Defaults to None. """ if self._animate is None: self._animate = self.app.animator.bind(self) assert self._animate is not None self._animate( attribute, value, final_value=final_value, duration=duration, speed=speed, delay=delay, easing=easing, on_complete=on_complete, ) @property def _layout(self) -> Layout: """Get the layout object if set in styles, or a default layout. Returns: Layout: A layout object. """ return self.styles.layout or self._default_layout @property def is_container(self) -> bool: """Check if this widget is a container (contains other widgets). Returns: bool: True if this widget is a container. """ return self.styles.layout is not None or bool(self.children) @property def is_scrollable(self) -> bool: """Check if this Widget may be scrolled. Returns: bool: True if this widget may be scrolled. """ return self.styles.layout is not None or bool(self.children) @property def layer(self) -> str: """Get the name of this widgets layer. Returns: str: Name of layer. """ return self.styles.layer or "default" @property def layers(self) -> tuple[str, ...]: """Layers of from parent. Returns: tuple[str, ...]: Tuple of layer names. """ for node in self.ancestors: if not isinstance(node, Widget): break if node.styles.has_rule("layers"): return node.styles.layers return ("default",) @property def link_style(self) -> Style: """Style of links.""" styles = self.styles _, background = self.background_colors link_background = background + styles.link_background link_color = link_background + ( link_background.get_contrast_text(styles.link_color.a) if styles.auto_link_color else styles.link_color ) style = styles.link_style + Style.from_color( link_color.rich_color, link_background.rich_color, ) return style @property def link_hover_style(self) -> Style: """Style of links with mouse hover.""" styles = self.styles _, background = self.background_colors hover_background = background + styles.link_hover_background hover_color = hover_background + ( hover_background.get_contrast_text(styles.link_hover_color.a) if styles.auto_link_hover_color else styles.link_hover_color ) style = styles.link_hover_style + Style.from_color( hover_color.rich_color, hover_background.rich_color, ) return style def _set_dirty(self, *regions: Region) -> None: """Set the Widget as 'dirty' (requiring re-paint). Regions should be specified as positional args. If no regions are added, then the entire widget will be considered dirty. Args: *regions (Region): Regions which require a repaint. """ if regions: content_offset = self.content_offset widget_regions = [region.translate(content_offset) for region in regions] self._dirty_regions.update(widget_regions) self._repaint_regions.update(widget_regions) self._styles_cache.set_dirty(*widget_regions) else: self._dirty_regions.clear() self._repaint_regions.clear() self._styles_cache.clear() self._dirty_regions.add(self.outer_size.region) self._repaint_regions.add(self.outer_size.region) def _exchange_repaint_regions(self) -> Collection[Region]: """Get a copy of the regions which need a repaint, and clear internal cache. Returns: Collection[Region]: Regions to repaint. """ regions = self._repaint_regions.copy() self._repaint_regions.clear() return regions def scroll_to( self, x: float | None = None, y: float | None = None, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll to a given (absolute) coordinate, optionally animating. Args: x (int | None, optional): X coordinate (column) to scroll to, or None for no change. Defaults to None. y (int | None, optional): Y coordinate (row) to scroll to, or None for no change. Defaults to None. animate (bool, optional): Animate to new scroll position. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if the scroll position changed, otherwise False. """ scrolled_x = scrolled_y = False if animate: # TODO: configure animation speed if duration is None and speed is None: speed = 50 if x is not None: self.scroll_target_x = x if x != self.scroll_x: self.animate( "scroll_x", self.scroll_target_x, speed=speed, duration=duration, easing="out_cubic", ) scrolled_x = True if y is not None: self.scroll_target_y = y if y != self.scroll_y: self.animate( "scroll_y", self.scroll_target_y, speed=speed, duration=duration, easing="out_cubic", ) scrolled_y = True else: if x is not None: scroll_x = self.scroll_x self.scroll_target_x = self.scroll_x = x scrolled_x = scroll_x != self.scroll_x if y is not None: scroll_y = self.scroll_y self.scroll_target_y = self.scroll_y = y scrolled_y = scroll_y != self.scroll_y return scrolled_x or scrolled_y def scroll_relative( self, x: float | None = None, y: float | None = None, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll relative to current position. Args: x (int | None, optional): X distance (columns) to scroll, or ``None`` for no change. Defaults to None. y (int | None, optional): Y distance (rows) to scroll, or ``None`` for no change. Defaults to None. animate (bool, optional): Animate to new scroll position. Defaults to False. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if the scroll position changed, otherwise False. """ return self.scroll_to( None if x is None else (self.scroll_x + x), None if y is None else (self.scroll_y + y), animate=animate, speed=speed, duration=duration, ) def scroll_home( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll to home position. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ if speed is None and duration is None: duration = 1.0 return self.scroll_to(0, 0, animate=animate, speed=speed, duration=duration) def scroll_end( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll to the end of the container. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ if speed is None and duration is None: duration = 1.0 return self.scroll_to( 0, self.max_scroll_y, animate=animate, speed=speed, duration=duration ) def scroll_left( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll one cell left. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ return self.scroll_to( x=self.scroll_target_x - 1, animate=animate, speed=speed, duration=duration ) def scroll_right( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll on cell right. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ return self.scroll_to( x=self.scroll_target_x + 1, animate=animate, speed=speed, duration=duration ) def scroll_down( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll one line down. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ return self.scroll_to( y=self.scroll_target_y + 1, animate=animate, speed=speed, duration=duration ) def scroll_up( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll one line up. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ return self.scroll_to( y=self.scroll_target_y - 1, animate=animate, speed=speed, duration=duration ) def scroll_page_up( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll one page up. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ return self.scroll_to( y=self.scroll_target_y - self.container_size.height, animate=animate, speed=speed, duration=duration, ) def scroll_page_down( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll one page down. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ return self.scroll_to( y=self.scroll_target_y + self.container_size.height, animate=animate, speed=speed, duration=duration, ) def scroll_page_left( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll one page left. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ if speed is None and duration is None: duration = 0.3 return self.scroll_to( x=self.scroll_target_x - self.container_size.width, animate=animate, speed=speed, duration=duration, ) def scroll_page_right( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll one page right. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ if speed is None and duration is None: duration = 0.3 return self.scroll_to( x=self.scroll_target_x + self.container_size.width, animate=animate, speed=speed, duration=duration, ) def scroll_to_widget( self, widget: Widget, *, animate: bool = True, speed: float | None = None, duration: float | None = None, top: bool = False, ) -> bool: """Scroll scrolling to bring a widget in to view. Args: widget (Widget): A descendant widget. animate (bool, optional): True to animate, or False to jump. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling has occurred in any descendant, otherwise False. """ # Grow the region by the margin so to keep the margin in view. region = widget.virtual_region_with_margin scrolled = False while isinstance(widget.parent, Widget) and widget is not self: container = widget.parent scroll_offset = container.scroll_to_region( region, spacing=widget.parent.gutter, animate=animate, speed=speed, duration=duration, top=top, ) if scroll_offset: scrolled = True # Adjust the region by the amount we just scrolled it, and convert to # it's parent's virtual coordinate system. region = ( ( region.translate(-scroll_offset) .translate(-widget.scroll_offset) .translate(container.virtual_region.offset) ) .grow(container.styles.margin) .intersection(container.virtual_region) ) widget = container return scrolled def scroll_to_region( self, region: Region, *, spacing: Spacing | None = None, animate: bool = True, speed: float | None = None, duration: float | None = None, top: bool = False, ) -> Offset: """Scrolls a given region in to view, if required. This method will scroll the least distance required to move `region` fully within the scrollable area. Args: region (Region): A region that should be visible. spacing (Spacing | None, optional): Optional spacing around the region. Defaults to None. animate (bool, optional): True to animate, or False to jump. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. top (bool, optional): Scroll region to top of container. Defaults to False. Returns: Offset: The distance that was scrolled. """ window = self.content_region.at_offset(self.scroll_offset) if spacing is not None: window = window.shrink(spacing) if window in region: return Offset() delta_x, delta_y = Region.get_scroll_to_visible(window, region, top=top) scroll_x, scroll_y = self.scroll_offset delta = Offset( clamp(scroll_x + delta_x, 0, self.max_scroll_x) - scroll_x, clamp(scroll_y + delta_y, 0, self.max_scroll_y) - scroll_y, ) if delta: if speed is None and duration is None: duration = 0.2 self.scroll_relative( delta.x or None, delta.y or None, animate=animate if (abs(delta_y) > 1 or delta_x) else False, speed=speed, duration=duration, ) return delta def scroll_visible( self, animate: bool = True, *, speed: float | None = None, duration: float | None = None, top: bool = False, ) -> None: """Scroll the container to make this widget visible. Args: animate (bool, optional): _description_. Defaults to True. speed (float | None, optional): _description_. Defaults to None. duration (float | None, optional): _description_. Defaults to None. top (bool, optional): Scroll to top of container. Defaults to False. """ parent = self.parent if isinstance(parent, Widget): self.call_later( parent.scroll_to_widget, self, animate=animate, speed=speed, duration=duration, top=top, ) def __init_subclass__( cls, can_focus: bool | None = None, can_focus_children: bool | None = None, inherit_css: bool = True, ) -> None: base = cls.__mro__[0] super().__init_subclass__(inherit_css=inherit_css) if issubclass(base, Widget): cls.can_focus = base.can_focus if can_focus is None else can_focus cls.can_focus_children = ( base.can_focus_children if can_focus_children is None else can_focus_children ) def __rich_repr__(self) -> rich.repr.Result: yield "id", self.id, None if self.name: yield "name", self.name if self.classes: yield "classes", set(self.classes) pseudo_classes = self.pseudo_classes if pseudo_classes: yield "pseudo_classes", set(pseudo_classes) def _get_scrollable_region(self, region: Region) -> Region: """Adjusts the Widget region to accommodate scrollbars. Args: region (Region): A region for the widget. Returns: Region: The widget region minus scrollbars. """ show_vertical_scrollbar, show_horizontal_scrollbar = self.scrollbars_enabled scrollbar_size_horizontal = self.styles.scrollbar_size_horizontal scrollbar_size_vertical = self.styles.scrollbar_size_vertical if self.styles.scrollbar_gutter == "stable": # Let's _always_ reserve some space, whether the scrollbar is actually displayed or not: show_vertical_scrollbar = True scrollbar_size_vertical = self.styles.scrollbar_size_vertical if show_horizontal_scrollbar and show_vertical_scrollbar: (region, _, _, _) = region.split( -scrollbar_size_vertical, -scrollbar_size_horizontal, ) elif show_vertical_scrollbar: region, _ = region.split_vertical(-scrollbar_size_vertical) elif show_horizontal_scrollbar: region, _ = region.split_horizontal(-scrollbar_size_horizontal) return region def _arrange_scrollbars(self, region: Region) -> Iterable[tuple[Widget, Region]]: """Arrange the 'chrome' widgets (typically scrollbars) for a layout element. Args: region (Region): The containing region. Returns: Iterable[tuple[Widget, Region]]: Tuples of scrollbar Widget and region. """ show_vertical_scrollbar, show_horizontal_scrollbar = self.scrollbars_enabled scrollbar_size_horizontal = self.scrollbar_size_horizontal scrollbar_size_vertical = self.scrollbar_size_vertical if show_horizontal_scrollbar and show_vertical_scrollbar: ( _, vertical_scrollbar_region, horizontal_scrollbar_region, scrollbar_corner_gap, ) = region.split( -scrollbar_size_vertical, -scrollbar_size_horizontal, ) if scrollbar_corner_gap: yield self.scrollbar_corner, scrollbar_corner_gap if vertical_scrollbar_region: yield self.vertical_scrollbar, vertical_scrollbar_region if horizontal_scrollbar_region: yield self.horizontal_scrollbar, horizontal_scrollbar_region elif show_vertical_scrollbar: _, scrollbar_region = region.split_vertical(-scrollbar_size_vertical) if scrollbar_region: yield self.vertical_scrollbar, scrollbar_region elif show_horizontal_scrollbar: _, scrollbar_region = region.split_horizontal(-scrollbar_size_horizontal) if scrollbar_region: yield self.horizontal_scrollbar, scrollbar_region def get_pseudo_classes(self) -> Iterable[str]: """Pseudo classes for a widget. Returns: Iterable[str]: Names of the pseudo classes. """ if self.mouse_over: yield "hover" if self.has_focus: yield "focus" try: focused = self.screen.focused except NoScreen: pass else: if focused: node = focused while node is not None: if node is self: yield "focus-within" break node = node._parent def post_render(self, renderable: RenderableType) -> ConsoleRenderable: """Applies style attributes to the default renderable. Returns: RenderableType: A new renderable. """ text_justify: JustifyMethod | None = None if self.styles.has_rule("text_align"): text_align: JustifyMethod = cast(JustifyMethod, self.styles.text_align) text_justify = _JUSTIFY_MAP.get(text_align, text_align) if isinstance(renderable, str): renderable = Text.from_markup(renderable, justify=text_justify) if ( isinstance(renderable, Text) and text_justify is not None and renderable.justify is None ): renderable.justify = text_justify renderable = _Styled( renderable, self.rich_style, self.link_style if self.auto_links else None ) return renderable def watch_mouse_over(self, value: bool) -> None: """Update from CSS if mouse over state changes.""" if self._has_hover_style: self.app.update_styles(self) def watch_has_focus(self, value: bool) -> None: """Update from CSS if has focus state changes.""" self.app.update_styles(self) def _size_updated( self, size: Size, virtual_size: Size, container_size: Size ) -> None: """Called when the widget's size is updated. Args: size (Size): Screen size. virtual_size (Size): Virtual (scrollable) size. container_size (Size): Container size (size of parent). """ if ( self._size != size or self.virtual_size != virtual_size or self._container_size != container_size ): self._size = size self.virtual_size = virtual_size self._container_size = container_size if self.is_scrollable: self._scroll_update(virtual_size) self.refresh() def _scroll_update(self, virtual_size: Size) -> None: """Update scrollbars visibility and dimensions. Args: virtual_size (Size): Virtual size. """ self._refresh_scrollbars() width, height = self.container_size if self.show_vertical_scrollbar: self.vertical_scrollbar.window_virtual_size = virtual_size.height self.vertical_scrollbar.window_size = ( height - self.scrollbar_size_horizontal ) if self.show_horizontal_scrollbar: self.horizontal_scrollbar.window_virtual_size = virtual_size.width self.horizontal_scrollbar.window_size = width - self.scrollbar_size_vertical self.scroll_x = self.validate_scroll_x(self.scroll_x) self.scroll_y = self.validate_scroll_y(self.scroll_y) def _render_content(self) -> None: """Render all lines.""" width, height = self.size renderable = self.render() renderable = self.post_render(renderable) options = self._console.options.update_dimensions(width, height).update( highlight=False ) segments = self._console.render(renderable, options) lines = list( islice( Segment.split_and_crop_lines( segments, width, include_new_lines=False, pad=False ), None, height, ) ) styles = self.styles align_horizontal, align_vertical = styles.content_align lines = list( align_lines( lines, Style(), self.size, align_horizontal, align_vertical, ) ) self._render_cache = RenderCache(self.size, lines) self._dirty_regions.clear() def render_line(self, y: int) -> list[Segment]: """Render a line of content. Args: y (int): Y Coordinate of line. Returns: list[Segment]: A rendered line. """ if self._dirty_regions: self._render_content() try: line = self._render_cache.lines[y] except IndexError: line = [Segment(" " * self.size.width, self.rich_style)] return line def render_lines(self, crop: Region) -> Lines: """Render the widget in to lines. Args: crop (Region): Region within visible area to render. Returns: Lines: A list of list of segments. """ lines = self._styles_cache.render_widget(self, crop) return lines def get_style_at(self, x: int, y: int) -> Style: """Get the Rich style in a widget at a given relative offset. Args: x (int): X coordinate relative to the widget. y (int): Y coordinate relative to the widget. Returns: Style: A rich Style object. """ offset = Offset(x, y) screen_offset = offset + self.region.offset widget, _ = self.screen.get_widget_at(*screen_offset) if widget is not self: return Style() return self.screen.get_style_at(*screen_offset) async def _forward_event(self, event: events.Event) -> None: event._set_forwarded() await self.post_message(event) def refresh( self, *regions: Region, repaint: bool = True, layout: bool = False ) -> None: """Initiate a refresh of the widget. This method sets an internal flag to perform a refresh, which will be done on the next idle event. Only one refresh will be done even if this method is called multiple times. By default this method will cause the content of the widget to refresh, but not change its size. You can also set `layout=True` to perform a layout. !!! warning It is rarely necessary to call this method explicitly. Updating styles or reactive attributes will do this automatically. Args: *regions (Region, optional): Additional screen regions to mark as dirty. repaint (bool, optional): Repaint the widget (will call render() again). Defaults to True. layout (bool, optional): Also layout widgets in the view. Defaults to False. """ if layout: self._layout_required = True if isinstance(self._parent, Widget): self._parent._clear_arrangement_cache() if repaint: self._set_dirty(*regions) self._content_width_cache = (None, 0) self._content_height_cache = (None, 0) self._rich_style_cache.clear() self._repaint_required = True self.check_idle() def remove(self) -> None: """Remove the Widget from the DOM (effectively deleting it)""" self.app.post_message_no_wait(events.Remove(self, widget=self)) def render(self) -> RenderableType: """Get renderable for widget. Returns: RenderableType: Any renderable """ render = "" if self.is_container else self.css_identifier_styled return render def _render(self) -> ConsoleRenderable | RichCast: """Get renderable, promoting str to text as required. Returns: ConsoleRenderable | RichCast: A renderable """ renderable = self.render() if isinstance(renderable, str): return Text(renderable) return renderable async def action(self, action: str) -> None: """Perform a given action, with this widget as the default namespace. Args: action (str): Action encoded as a string. """ await self.app.action(action, self) async def post_message(self, message: Message) -> bool: """Post a message to this widget. Args: message (Message): Message to post. Returns: bool: True if the message was posted, False if this widget was closed / closing. """ if not self.check_message_enabled(message): return True if not self.is_running: self.log.warning(self, f"IS NOT RUNNING, {message!r} not sent") return await super().post_message(message) async def _on_idle(self, event: events.Idle) -> None: """Called when there are no more events on the queue. Args: event (events.Idle): Idle event. """ if self._parent is not None and not self._closing: try: screen = self.screen except NoScreen: pass else: if self._repaint_required: self._repaint_required = False screen.post_message_no_wait(messages.Update(self, self)) if self._layout_required: self._layout_required = False screen.post_message_no_wait(messages.Layout(self)) def focus(self, scroll_visible: bool = True) -> None: """Give focus to this widget. Args: scroll_visible (bool, optional): Scroll parent to make this widget visible. Defaults to True. """ def set_focus(widget: Widget): """Callback to set the focus.""" try: widget.screen.set_focus(self, scroll_visible=scroll_visible) except NoScreen: pass self.app.call_later(set_focus, self) def reset_focus(self) -> None: """Reset the focus (move it to the next available widget).""" try: self.screen._reset_focus(self) except NoScreen: pass def capture_mouse(self, capture: bool = True) -> None: """Capture (or release) the mouse. When captured, mouse events will go to this widget even when the pointer is not directly over the widget. Args: capture (bool, optional): True to capture or False to release. Defaults to True. """ self.app.capture_mouse(self if capture else None) def release_mouse(self) -> None: """Release the mouse. Mouse events will only be sent when the mouse is over the widget. """ self.app.capture_mouse(None) async def broker_event(self, event_name: str, event: events.Event) -> bool: return await self.app._broker_event(event_name, event, default_namespace=self) def _on_styles_updated(self) -> None: self._rich_style_cache.clear() async def _on_mouse_down(self, event: events.MouseUp) -> None: await self.broker_event("mouse.down", event) async def _on_mouse_up(self, event: events.MouseUp) -> None: await self.broker_event("mouse.up", event) async def _on_click(self, event: events.Click) -> None: await self.broker_event("click", event) async def _on_key(self, event: events.Key) -> None: await self.handle_key(event) async def handle_key(self, event: events.Key) -> bool: return await self.dispatch_key(event) async def _on_compose(self, event: events.Compose) -> None: widgets = list(self.compose()) await self.mount(*widgets) def _on_mount(self, event: events.Mount) -> None: if self.styles.overflow_y == "scroll": self.show_vertical_scrollbar = True if self.styles.overflow_x == "scroll": self.show_horizontal_scrollbar = True def _on_leave(self, event: events.Leave) -> None: self.mouse_over = False self.hover_style = Style() def _on_enter(self, event: events.Enter) -> None: self.mouse_over = True def _on_focus(self, event: events.Focus) -> None: for node in self.ancestors: if node._has_focus_within: self.app.update_styles(node) self.has_focus = True self.refresh() def _on_blur(self, event: events.Blur) -> None: if any(node._has_focus_within for node in self.ancestors): self.app.update_styles(self) self.has_focus = False self.refresh() def _on_mouse_scroll_down(self, event) -> None: if self.allow_vertical_scroll: if self.scroll_down(animate=False): event.stop() def _on_mouse_scroll_up(self, event) -> None: if self.allow_vertical_scroll: if self.scroll_up(animate=False): event.stop() def _on_scroll_to(self, message: ScrollTo) -> None: if self._allow_scroll: self.scroll_to(message.x, message.y, animate=message.animate, duration=0.1) message.stop() def _on_scroll_up(self, event: ScrollUp) -> None: if self.allow_vertical_scroll: self.scroll_page_up() event.stop() def _on_scroll_down(self, event: ScrollDown) -> None: if self.allow_vertical_scroll: self.scroll_page_down() event.stop() def _on_scroll_left(self, event: ScrollLeft) -> None: if self.allow_horizontal_scroll: self.scroll_page_left() event.stop() def _on_scroll_right(self, event: ScrollRight) -> None: if self.allow_horizontal_scroll: self.scroll_page_right() event.stop() def _on_hide(self, event: events.Hide) -> None: if self.has_focus: self.reset_focus() def _on_scroll_to_region(self, message: messages.ScrollToRegion) -> None: self.scroll_to_region(message.region, animate=True) def _key_home(self) -> bool: if self._allow_scroll: self.scroll_home() return True return False def _key_end(self) -> bool: if self._allow_scroll: self.scroll_end() return True return False def _key_left(self) -> bool: if self.allow_horizontal_scroll: self.scroll_left() return True return False def _key_right(self) -> bool: if self.allow_horizontal_scroll: self.scroll_right() return True return False def _key_down(self) -> bool: if self.allow_vertical_scroll: self.scroll_down() return True return False def _key_up(self) -> bool: if self.allow_vertical_scroll: self.scroll_up() return True return False def _key_pagedown(self) -> bool: if self.allow_vertical_scroll: self.scroll_page_down() return True return False def _key_pageup(self) -> bool: if self.allow_vertical_scroll: self.scroll_page_up() return True return False
Ancestors
Subclasses
- Bar
- EasingButtons
- Container
- Content
- Grid
- Horizontal
- Vertical
- Screen
- ScrollView
- ScrollBar
- ScrollBarCorner
- textual.widgets._checkbox.Checkbox
- textual.widgets._footer.Footer
- textual.widgets._header.Header
- textual.widgets._header.HeaderClock
- textual.widgets._header.HeaderIcon
- textual.widgets._header.HeaderTitle
- textual.widgets._input.Input
- textual.widgets._static.Static
Class variables
var COMPONENT_CLASSES : ClassVar[set[str]]
var DEFAULT_CSS
var can_focus : bool
-
Widget may receive focus.
var can_focus_children : bool
-
Widget's children may receive focus.
Instance variables
var allow_horizontal_scroll : bool
-
Check if horizontal scroll is permitted.
May be overridden if you want different logic regarding allowing scrolling.
Returns
bool
- True if the widget may scroll horizontally.
Expand source code
@property def allow_horizontal_scroll(self) -> bool: """Check if horizontal scroll is permitted. May be overridden if you want different logic regarding allowing scrolling. Returns: bool: True if the widget may scroll _horizontally_. """ return self.is_scrollable and self.show_horizontal_scrollbar
var allow_vertical_scroll : bool
-
Check if vertical scroll is permitted.
May be overridden if you want different logic regarding allowing scrolling.
Returns
bool
- True if the widget may scroll vertically.
Expand source code
@property def allow_vertical_scroll(self) -> bool: """Check if vertical scroll is permitted. May be overridden if you want different logic regarding allowing scrolling. Returns: bool: True if the widget may scroll _vertically_. """ return self.is_scrollable and self.show_vertical_scrollbar
var auto_height : ReactiveType
-
Reactive descriptor.
Args
- default (ReactiveType | Callable[[], ReactiveType]): A default value or callable that returns a default.
layout
:bool
, optional- Perform a layout on change. Defaults to False.
repaint
:bool
, optional- Perform a repaint on change. Defaults to True.
init
:bool
, optional- Call watchers on initialize (post mount). Defaults to False.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var auto_links : ReactiveType
-
Widget will highlight links automatically.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var auto_width : ReactiveType
-
Reactive descriptor.
Args
- default (ReactiveType | Callable[[], ReactiveType]): A default value or callable that returns a default.
layout
:bool
, optional- Perform a layout on change. Defaults to False.
repaint
:bool
, optional- Perform a repaint on change. Defaults to True.
init
:bool
, optional- Call watchers on initialize (post mount). Defaults to False.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var container_size : Size
-
The size of the container (parent widget).
Returns
Size
- Container size.
Expand source code
@property def container_size(self) -> Size: """The size of the container (parent widget). Returns: Size: Container size. """ return self._container_size
var container_viewport : Region
-
The viewport region (parent window).
Returns
Region
- The region that contains this widget.
Expand source code
@property def container_viewport(self) -> Region: """The viewport region (parent window). Returns: Region: The region that contains this widget. """ if self.parent is None: return self.size.region assert isinstance(self.parent, Widget) return self.parent.region
var content_offset : Offset
-
An offset from the Widget origin where the content begins.
Returns
Offset
- Offset from widget's origin.
Expand source code
@property def content_offset(self) -> Offset: """An offset from the Widget origin where the content begins. Returns: Offset: Offset from widget's origin. """ x, y = self.gutter.top_left return Offset(x, y)
var content_region : Region
-
Gets an absolute region containing the content (minus padding and border).
Returns
Region
- Screen region that contains a widget's content.
Expand source code
@property def content_region(self) -> Region: """Gets an absolute region containing the content (minus padding and border). Returns: Region: Screen region that contains a widget's content. """ content_region = self.region.shrink(self.styles.gutter) return content_region
var content_size : Size
-
Get the size of the content area.
Expand source code
@property def content_size(self) -> Size: """Get the size of the content area.""" return self.region.shrink(self.styles.gutter).size
var expand : ReactiveType
-
Rich renderable may expand.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var focusable_children : list[Widget]
-
Expand source code
@property def focusable_children(self) -> list[Widget]: """Get the children which may be focused. Returns: list[Widget]: List of widgets that can receive focus. """ focusable = [ child for child in self.children if child.display and child.visible ] return sorted(focusable, key=attrgetter("_focus_sort_key"))
var gutter : Spacing
-
Spacing for padding / border / scrollbars.
Returns
Spacing
- Additional spacing around content area.
Expand source code
@property def gutter(self) -> Spacing: """Spacing for padding / border / scrollbars. Returns: Spacing: Additional spacing around content area. """ return self.styles.gutter + self.scrollbar_gutter
var has_focus : ReactiveType
-
Reactive descriptor.
Args
- default (ReactiveType | Callable[[], ReactiveType]): A default value or callable that returns a default.
layout
:bool
, optional- Perform a layout on change. Defaults to False.
repaint
:bool
, optional- Perform a repaint on change. Defaults to True.
init
:bool
, optional- Call watchers on initialize (post mount). Defaults to False.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var highlight_link_id : ReactiveType
-
Reactive descriptor.
Args
- default (ReactiveType | Callable[[], ReactiveType]): A default value or callable that returns a default.
layout
:bool
, optional- Perform a layout on change. Defaults to False.
repaint
:bool
, optional- Perform a repaint on change. Defaults to True.
init
:bool
, optional- Call watchers on initialize (post mount). Defaults to False.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var horizontal_scrollbar : ScrollBar
-
Get a vertical scrollbar (create if necessary).
Returns
ScrollBar
- ScrollBar Widget.
Expand source code
@property def horizontal_scrollbar(self) -> ScrollBar: """Get a vertical scrollbar (create if necessary). Returns: ScrollBar: ScrollBar Widget. """ from .scrollbar import ScrollBar if self._horizontal_scrollbar is not None: return self._horizontal_scrollbar self._horizontal_scrollbar = scroll_bar = ScrollBar( vertical=False, name="horizontal", thickness=self.scrollbar_size_horizontal ) self._horizontal_scrollbar.display = False self.app._start_widget(self, scroll_bar) return scroll_bar
var hover_style : ReactiveType
-
Reactive descriptor.
Args
- default (ReactiveType | Callable[[], ReactiveType]): A default value or callable that returns a default.
layout
:bool
, optional- Perform a layout on change. Defaults to False.
repaint
:bool
, optional- Perform a repaint on change. Defaults to True.
init
:bool
, optional- Call watchers on initialize (post mount). Defaults to False.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var is_container : bool
-
Check if this widget is a container (contains other widgets).
Returns
bool
- True if this widget is a container.
Expand source code
@property def is_container(self) -> bool: """Check if this widget is a container (contains other widgets). Returns: bool: True if this widget is a container. """ return self.styles.layout is not None or bool(self.children)
var is_scrollable : bool
-
Check if this Widget may be scrolled.
Returns
bool
- True if this widget may be scrolled.
Expand source code
@property def is_scrollable(self) -> bool: """Check if this Widget may be scrolled. Returns: bool: True if this widget may be scrolled. """ return self.styles.layout is not None or bool(self.children)
var is_transparent : bool
-
Check if the background styles is not set.
Returns
bool
True
if there is background color, otherwiseFalse
.
Expand source code
@property def is_transparent(self) -> bool: """Check if the background styles is not set. Returns: bool: ``True`` if there is background color, otherwise ``False``. """ return self.is_scrollable and self.styles.background.is_transparent
var layer : str
-
Get the name of this widgets layer.
Returns
str
- Name of layer.
Expand source code
@property def layer(self) -> str: """Get the name of this widgets layer. Returns: str: Name of layer. """ return self.styles.layer or "default"
var layers : tuple[str, ...]
-
Layers of from parent.
Returns
tuple[str, …]
- Tuple of layer names.
Expand source code
@property def layers(self) -> tuple[str, ...]: """Layers of from parent. Returns: tuple[str, ...]: Tuple of layer names. """ for node in self.ancestors: if not isinstance(node, Widget): break if node.styles.has_rule("layers"): return node.styles.layers return ("default",)
var link_hover_style : rich.style.Style
-
Style of links with mouse hover.
Expand source code
@property def link_hover_style(self) -> Style: """Style of links with mouse hover.""" styles = self.styles _, background = self.background_colors hover_background = background + styles.link_hover_background hover_color = hover_background + ( hover_background.get_contrast_text(styles.link_hover_color.a) if styles.auto_link_hover_color else styles.link_hover_color ) style = styles.link_hover_style + Style.from_color( hover_color.rich_color, hover_background.rich_color, ) return style
var link_style : rich.style.Style
-
Style of links.
Expand source code
@property def link_style(self) -> Style: """Style of links.""" styles = self.styles _, background = self.background_colors link_background = background + styles.link_background link_color = link_background + ( link_background.get_contrast_text(styles.link_color.a) if styles.auto_link_color else styles.link_color ) style = styles.link_style + Style.from_color( link_color.rich_color, link_background.rich_color, ) return style
var max_scroll_x : int
-
The maximum value of
scroll_x
.Expand source code
@property def max_scroll_x(self) -> int: """The maximum value of `scroll_x`.""" return max( 0, self.virtual_size.width - self.container_size.width + self.scrollbar_size_vertical, )
var max_scroll_y : int
-
The maximum value of
scroll_y
.Expand source code
@property def max_scroll_y(self) -> int: """The maximum value of `scroll_y`.""" return max( 0, self.virtual_size.height - self.container_size.height + self.scrollbar_size_horizontal, )
var mouse_over : ReactiveType
-
Reactive descriptor.
Args
- default (ReactiveType | Callable[[], ReactiveType]): A default value or callable that returns a default.
layout
:bool
, optional- Perform a layout on change. Defaults to False.
repaint
:bool
, optional- Perform a repaint on change. Defaults to True.
init
:bool
, optional- Call watchers on initialize (post mount). Defaults to False.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var offset : Offset
-
Widget offset from origin.
Returns
Offset
- Relative offset.
Expand source code
@property def offset(self) -> Offset: """Widget offset from origin. Returns: Offset: Relative offset. """ return self.styles.offset.resolve(self.size, self.app.size)
var outer_size : Size
-
The size of the widget (including padding and border).
Returns
Size
- Outer size.
Expand source code
@property def outer_size(self) -> Size: """The size of the widget (including padding and border). Returns: Size: Outer size. """ return self._size
var region : Region
-
The region occupied by this widget, relative to the Screen.
Raises
NoScreen
- If there is no screen.
errors.NoWidget
- If the widget is not on the screen.
Returns
Region
- Region within screen occupied by widget.
Expand source code
@property def region(self) -> Region: """The region occupied by this widget, relative to the Screen. Raises: NoScreen: If there is no screen. errors.NoWidget: If the widget is not on the screen. Returns: Region: Region within screen occupied by widget. """ try: return self.screen.find_widget(self).region except NoScreen: return Region() except errors.NoWidget: return Region()
var scroll_offset : Offset
-
Get the current scroll offset.
Returns
Offset
- Offset a container has been scrolled by.
Expand source code
@property def scroll_offset(self) -> Offset: """Get the current scroll offset. Returns: Offset: Offset a container has been scrolled by. """ return Offset(int(self.scroll_x), int(self.scroll_y))
var scroll_target_x : ReactiveType
-
Reactive descriptor.
Args
- default (ReactiveType | Callable[[], ReactiveType]): A default value or callable that returns a default.
layout
:bool
, optional- Perform a layout on change. Defaults to False.
repaint
:bool
, optional- Perform a repaint on change. Defaults to True.
init
:bool
, optional- Call watchers on initialize (post mount). Defaults to False.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var scroll_target_y : ReactiveType
-
Reactive descriptor.
Args
- default (ReactiveType | Callable[[], ReactiveType]): A default value or callable that returns a default.
layout
:bool
, optional- Perform a layout on change. Defaults to False.
repaint
:bool
, optional- Perform a repaint on change. Defaults to True.
init
:bool
, optional- Call watchers on initialize (post mount). Defaults to False.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var scroll_x : ReactiveType
-
Reactive descriptor.
Args
- default (ReactiveType | Callable[[], ReactiveType]): A default value or callable that returns a default.
layout
:bool
, optional- Perform a layout on change. Defaults to False.
repaint
:bool
, optional- Perform a repaint on change. Defaults to True.
init
:bool
, optional- Call watchers on initialize (post mount). Defaults to False.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var scroll_y : ReactiveType
-
Reactive descriptor.
Args
- default (ReactiveType | Callable[[], ReactiveType]): A default value or callable that returns a default.
layout
:bool
, optional- Perform a layout on change. Defaults to False.
repaint
:bool
, optional- Perform a repaint on change. Defaults to True.
init
:bool
, optional- Call watchers on initialize (post mount). Defaults to False.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var scrollbar_corner : ScrollBarCorner
-
Return the ScrollBarCorner - the cells that appear between the horizontal and vertical scrollbars (only when both are visible).
Expand source code
@property def scrollbar_corner(self) -> ScrollBarCorner: """Return the ScrollBarCorner - the cells that appear between the horizontal and vertical scrollbars (only when both are visible). """ from .scrollbar import ScrollBarCorner if self._scrollbar_corner is not None: return self._scrollbar_corner self._scrollbar_corner = ScrollBarCorner() self.app._start_widget(self, self._scrollbar_corner) return self._scrollbar_corner
var scrollbar_gutter : Spacing
-
Spacing required to fit scrollbar(s).
Returns
Spacing
- Scrollbar gutter spacing.
Expand source code
@property def scrollbar_gutter(self) -> Spacing: """Spacing required to fit scrollbar(s). Returns: Spacing: Scrollbar gutter spacing. """ gutter = Spacing( 0, self.scrollbar_size_vertical, self.scrollbar_size_horizontal, 0 ) return gutter
var scrollbar_size_horizontal : int
-
Get the height used by the horizontal scrollbar.
Returns
int
- Number of rows in the horizontal scrollbar.
Expand source code
@property def scrollbar_size_horizontal(self) -> int: """Get the height used by the *horizontal* scrollbar. Returns: int: Number of rows in the horizontal scrollbar. """ styles = self.styles if styles.scrollbar_gutter == "stable" and styles.overflow_x == "auto": return styles.scrollbar_size_horizontal return styles.scrollbar_size_horizontal if self.show_horizontal_scrollbar else 0
var scrollbar_size_vertical : int
-
Get the width used by the vertical scrollbar.
Returns
int
- Number of columns in the vertical scrollbar.
Expand source code
@property def scrollbar_size_vertical(self) -> int: """Get the width used by the *vertical* scrollbar. Returns: int: Number of columns in the vertical scrollbar. """ styles = self.styles if styles.scrollbar_gutter == "stable" and styles.overflow_y == "auto": return styles.scrollbar_size_vertical return styles.scrollbar_size_vertical if self.show_vertical_scrollbar else 0
var scrollbars_enabled : tuple[bool, bool]
-
A tuple of booleans that indicate if scrollbars are enabled.
Returns
tuple[bool, bool]
- A tuple of (
, )
Expand source code
@property def scrollbars_enabled(self) -> tuple[bool, bool]: """A tuple of booleans that indicate if scrollbars are enabled. Returns: tuple[bool, bool]: A tuple of (<vertical scrollbar enabled>, <horizontal scrollbar enabled>) """ if not self.is_scrollable: return False, False enabled = self.show_vertical_scrollbar, self.show_horizontal_scrollbar return enabled
var show_horizontal_scrollbar : ReactiveType
-
Reactive descriptor.
Args
- default (ReactiveType | Callable[[], ReactiveType]): A default value or callable that returns a default.
layout
:bool
, optional- Perform a layout on change. Defaults to False.
repaint
:bool
, optional- Perform a repaint on change. Defaults to True.
init
:bool
, optional- Call watchers on initialize (post mount). Defaults to False.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var show_vertical_scrollbar : ReactiveType
-
Reactive descriptor.
Args
- default (ReactiveType | Callable[[], ReactiveType]): A default value or callable that returns a default.
layout
:bool
, optional- Perform a layout on change. Defaults to False.
repaint
:bool
, optional- Perform a repaint on change. Defaults to True.
init
:bool
, optional- Call watchers on initialize (post mount). Defaults to False.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var shrink : ReactiveType
-
Rich renderable may shrink.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var siblings : list[Widget]
-
Get the widget's siblings (self is removed from the return list).
Returns
list[Widget]
- A list of siblings.
Expand source code
@property def siblings(self) -> list[Widget]: """Get the widget's siblings (self is removed from the return list). Returns: list[Widget]: A list of siblings. """ parent = self.parent if parent is not None: siblings = list(parent.children) siblings.remove(self) return siblings else: return []
var size : Size
-
The size of the content area.
Returns
Size
- Content area size.
Expand source code
@property def size(self) -> Size: """The size of the content area. Returns: Size: Content area size. """ return self.content_region.size
var vertical_scrollbar : ScrollBar
-
Get a vertical scrollbar (create if necessary).
Returns
ScrollBar
- ScrollBar Widget.
Expand source code
@property def vertical_scrollbar(self) -> ScrollBar: """Get a vertical scrollbar (create if necessary). Returns: ScrollBar: ScrollBar Widget. """ from .scrollbar import ScrollBar if self._vertical_scrollbar is not None: return self._vertical_scrollbar self._vertical_scrollbar = scroll_bar = ScrollBar( vertical=True, name="vertical", thickness=self.scrollbar_size_vertical ) self._vertical_scrollbar.display = False self.app._start_widget(self, scroll_bar) return scroll_bar
var virtual_region : Region
-
The widget region relative to it's container. Which may not be visible, depending on scroll offset.
Expand source code
@property def virtual_region(self) -> Region: """The widget region relative to it's container. Which may not be visible, depending on scroll offset. """ try: return self.screen.find_widget(self).virtual_region except NoScreen: return Region() except errors.NoWidget: return Region()
var virtual_region_with_margin : Region
-
The widget region relative to its container (including margin), which may not be visible, depending on the scroll offset.
Returns
Region
- The virtual region of the Widget, inclusive of its margin.
Expand source code
@property def virtual_region_with_margin(self) -> Region: """The widget region relative to its container (*including margin*), which may not be visible, depending on the scroll offset. Returns: Region: The virtual region of the Widget, inclusive of its margin. """ return self.virtual_region.grow(self.styles.margin)
var virtual_size : ReactiveType
-
Reactive descriptor.
Args
- default (ReactiveType | Callable[[], ReactiveType]): A default value or callable that returns a default.
layout
:bool
, optional- Perform a layout on change. Defaults to False.
repaint
:bool
, optional- Perform a repaint on change. Defaults to True.
init
:bool
, optional- Call watchers on initialize (post mount). Defaults to False.
Expand source code
def __get__(self, obj: Reactable, obj_type: type[object]) -> ReactiveType: value: _NotSet | ReactiveType = getattr(obj, self.internal_name, _NOT_SET) if isinstance(value, _NotSet): # No value present, we need to set the default init_name = f"_default_{self.name}" default = getattr(obj, init_name) default_value = default() if callable(default) else default # Set and return the value setattr(obj, self.internal_name, default_value) if self._init: self._check_watchers(obj, self.name, default_value, first_set=True) return default_value return value
var visible_siblings : list[Widget]
-
Expand source code
@property def visible_siblings(self) -> list[Widget]: """A list of siblings which will be shown. Returns: list[Widget]: List of siblings. """ siblings = [ widget for widget in self.siblings if widget.visible and widget.display ] return siblings
var window_region : Region
-
The region within the scrollable area that is currently visible.
Returns
Region
- New region.
Expand source code
@property def window_region(self) -> Region: """The region within the scrollable area that is currently visible. Returns: Region: New region. """ window_region = self.region.at_offset(self.scroll_offset) return window_region
Methods
async def action(self, action: str) ‑> None
-
Perform a given action, with this widget as the default namespace.
Args
action
:str
- Action encoded as a string.
Expand source code
async def action(self, action: str) -> None: """Perform a given action, with this widget as the default namespace. Args: action (str): Action encoded as a string. """ await self.app.action(action, self)
def animate(self, attribute: str, value: float | Animatable, *, final_value: object = Ellipsis, duration: float | None = None, speed: float | None = None, delay: float = 0.0, easing: EasingFunction | str = 'in_out_cubic', on_complete: CallbackType | None = None) ‑> None
-
Animate an attribute.
Args
attribute
:str
- Name of the attribute to animate.
- value (float | Animatable): The value to animate to.
final_value
:object
, optional- The final value of the animation. Defaults to
value
if not set. - duration (float | None, optional): The duration of the animate. Defaults to None.
- speed (float | None, optional): The speed of the animation. Defaults to None.
delay
:float
, optional- A delay (in seconds) before the animation starts. Defaults to 0.0.
easing (EasingFunction | str, optional): An easing method. Defaults to "in_out_cubic". on_complete (CallbackType | None, optional): A callable to invoke when the animation is finished. Defaults to None.
Expand source code
def animate( self, attribute: str, value: float | Animatable, *, final_value: object = ..., duration: float | None = None, speed: float | None = None, delay: float = 0.0, easing: EasingFunction | str = DEFAULT_EASING, on_complete: CallbackType | None = None, ) -> None: """Animate an attribute. Args: attribute (str): Name of the attribute to animate. value (float | Animatable): The value to animate to. final_value (object, optional): The final value of the animation. Defaults to `value` if not set. duration (float | None, optional): The duration of the animate. Defaults to None. speed (float | None, optional): The speed of the animation. Defaults to None. delay (float, optional): A delay (in seconds) before the animation starts. Defaults to 0.0. easing (EasingFunction | str, optional): An easing method. Defaults to "in_out_cubic". on_complete (CallbackType | None, optional): A callable to invoke when the animation is finished. Defaults to None. """ if self._animate is None: self._animate = self.app.animator.bind(self) assert self._animate is not None self._animate( attribute, value, final_value=final_value, duration=duration, speed=speed, delay=delay, easing=easing, on_complete=on_complete, )
async def broker_event(self, event_name: str, event: events.Event) ‑> bool
-
Expand source code
async def broker_event(self, event_name: str, event: events.Event) -> bool: return await self.app._broker_event(event_name, event, default_namespace=self)
def capture_mouse(self, capture: bool = True) ‑> None
-
Capture (or release) the mouse.
When captured, mouse events will go to this widget even when the pointer is not directly over the widget.
Args
capture
:bool
, optional- True to capture or False to release. Defaults to True.
Expand source code
def capture_mouse(self, capture: bool = True) -> None: """Capture (or release) the mouse. When captured, mouse events will go to this widget even when the pointer is not directly over the widget. Args: capture (bool, optional): True to capture or False to release. Defaults to True. """ self.app.capture_mouse(self if capture else None)
def compose(self) ‑> ComposeResult
-
Called by Textual to create child widgets.
Extend this to build a UI.
Example
def compose(self) -> ComposeResult: yield Header() yield Container( TreeControl(), Viewer() ) yield Footer()
Expand source code
def compose(self) -> ComposeResult: """Called by Textual to create child widgets. Extend this to build a UI. Example: ```python def compose(self) -> ComposeResult: yield Header() yield Container( TreeControl(), Viewer() ) yield Footer() ``` """ return yield
def focus(self, scroll_visible: bool = True) ‑> None
-
Give focus to this widget.
Args
scroll_visible
:bool
, optional- Scroll parent to make this widget visible. Defaults to True.
Expand source code
def focus(self, scroll_visible: bool = True) -> None: """Give focus to this widget. Args: scroll_visible (bool, optional): Scroll parent to make this widget visible. Defaults to True. """ def set_focus(widget: Widget): """Callback to set the focus.""" try: widget.screen.set_focus(self, scroll_visible=scroll_visible) except NoScreen: pass self.app.call_later(set_focus, self)
def get_component_rich_style(self, name: str) ‑> rich.style.Style
-
Get a Rich style for a component.
Args
name
:str
- Name of component.
Returns
Style
- A Rich style object.
Expand source code
def get_component_rich_style(self, name: str) -> Style: """Get a *Rich* style for a component. Args: name (str): Name of component. Returns: Style: A Rich style object. """ style = self._rich_style_cache.get(name) if style is None: style = self.get_component_styles(name).rich_style self._rich_style_cache[name] = style return style
def get_content_height(self, container: Size, viewport: Size, width: int) ‑> int
-
Called by Textual to get the height of the content area. May be overridden in a subclass.
Args
container
:Size
- Size of the container (immediate parent) widget.
viewport
:Size
- Size of the viewport.
width
:int
- Width of renderable.
Returns
int
- The height of the content.
Expand source code
def get_content_height(self, container: Size, viewport: Size, width: int) -> int: """Called by Textual to get the height of the content area. May be overridden in a subclass. Args: container (Size): Size of the container (immediate parent) widget. viewport (Size): Size of the viewport. width (int): Width of renderable. Returns: int: The height of the content. """ if self.is_container: assert self._layout is not None height = ( self._layout.get_content_height( self, container, viewport, width, ) + self.scrollbar_size_horizontal ) else: cache_key = width if self._content_height_cache[0] == cache_key: return self._content_height_cache[1] renderable = self.render() options = self._console.options.update_width(width).update(highlight=False) segments = self._console.render(renderable, options) # Cheaper than counting the lines returned from render_lines! height = sum(text.count("\n") for text, _, _ in segments) self._content_height_cache = (cache_key, height) return height
def get_content_width(self, container: Size, viewport: Size) ‑> int
-
Called by textual to get the width of the content area. May be overridden in a subclass.
Args
container
:Size
- Size of the container (immediate parent) widget.
viewport
:Size
- Size of the viewport.
Returns
int
- The optimal width of the content.
Expand source code
def get_content_width(self, container: Size, viewport: Size) -> int: """Called by textual to get the width of the content area. May be overridden in a subclass. Args: container (Size): Size of the container (immediate parent) widget. viewport (Size): Size of the viewport. Returns: int: The optimal width of the content. """ if self.is_container: assert self._layout is not None return self._layout.get_content_width(self, container, viewport) cache_key = container.width if self._content_width_cache[0] == cache_key: return self._content_width_cache[1] console = self.app.console renderable = self._render() width = measure(console, renderable, container.width) if self.expand: width = max(container.width, width) if self.shrink: width = min(width, container.width) self._content_width_cache = (cache_key, width) return width
def get_pseudo_classes(self) ‑> Iterable[str]
-
Pseudo classes for a widget.
Returns
Iterable[str]
- Names of the pseudo classes.
Expand source code
def get_pseudo_classes(self) -> Iterable[str]: """Pseudo classes for a widget. Returns: Iterable[str]: Names of the pseudo classes. """ if self.mouse_over: yield "hover" if self.has_focus: yield "focus" try: focused = self.screen.focused except NoScreen: pass else: if focused: node = focused while node is not None: if node is self: yield "focus-within" break node = node._parent
def get_style_at(self, x: int, y: int) ‑> rich.style.Style
-
Get the Rich style in a widget at a given relative offset.
Args
x
:int
- X coordinate relative to the widget.
y
:int
- Y coordinate relative to the widget.
Returns
Style
- A rich Style object.
Expand source code
def get_style_at(self, x: int, y: int) -> Style: """Get the Rich style in a widget at a given relative offset. Args: x (int): X coordinate relative to the widget. y (int): Y coordinate relative to the widget. Returns: Style: A rich Style object. """ offset = Offset(x, y) screen_offset = offset + self.region.offset widget, _ = self.screen.get_widget_at(*screen_offset) if widget is not self: return Style() return self.screen.get_style_at(*screen_offset)
async def handle_key(self, event: events.Key) ‑> bool
-
Expand source code
async def handle_key(self, event: events.Key) -> bool: return await self.dispatch_key(event)
def mount(self, *anon_widgets: Widget, **widgets: Widget) ‑> AwaitMount
-
Mount child widgets (making this widget a container).
Widgets may be passed as positional arguments or keyword arguments. If keyword arguments, the keys will be set as the Widget's id.
Example
self.mount(Static("hello"), header=Header())
Returns
AwaitMount
- An awaitable object that waits for widgets to be mounted.
Expand source code
def mount(self, *anon_widgets: Widget, **widgets: Widget) -> AwaitMount: """Mount child widgets (making this widget a container). Widgets may be passed as positional arguments or keyword arguments. If keyword arguments, the keys will be set as the Widget's id. Example: ```python self.mount(Static("hello"), header=Header()) ``` Returns: AwaitMount: An awaitable object that waits for widgets to be mounted. """ mounted_widgets = self.app._register(self, *anon_widgets, **widgets) return AwaitMount(mounted_widgets)
async def post_message(self, message: Message) ‑> bool
-
Post a message to this widget.
Args
message
:Message
- Message to post.
Returns
bool
- True if the message was posted, False if this widget was closed / closing.
Expand source code
async def post_message(self, message: Message) -> bool: """Post a message to this widget. Args: message (Message): Message to post. Returns: bool: True if the message was posted, False if this widget was closed / closing. """ if not self.check_message_enabled(message): return True if not self.is_running: self.log.warning(self, f"IS NOT RUNNING, {message!r} not sent") return await super().post_message(message)
def post_render(self, renderable: RenderableType) ‑> rich.console.ConsoleRenderable
-
Applies style attributes to the default renderable.
Returns
RenderableType
- A new renderable.
Expand source code
def post_render(self, renderable: RenderableType) -> ConsoleRenderable: """Applies style attributes to the default renderable. Returns: RenderableType: A new renderable. """ text_justify: JustifyMethod | None = None if self.styles.has_rule("text_align"): text_align: JustifyMethod = cast(JustifyMethod, self.styles.text_align) text_justify = _JUSTIFY_MAP.get(text_align, text_align) if isinstance(renderable, str): renderable = Text.from_markup(renderable, justify=text_justify) if ( isinstance(renderable, Text) and text_justify is not None and renderable.justify is None ): renderable.justify = text_justify renderable = _Styled( renderable, self.rich_style, self.link_style if self.auto_links else None ) return renderable
def refresh(self, *regions: Region, repaint: bool = True, layout: bool = False) ‑> None
-
Initiate a refresh of the widget.
This method sets an internal flag to perform a refresh, which will be done on the next idle event. Only one refresh will be done even if this method is called multiple times.
By default this method will cause the content of the widget to refresh, but not change its size. You can also set
layout=True
to perform a layout.Warning
It is rarely necessary to call this method explicitly. Updating styles or reactive attributes will do this automatically.
Args
*regions
:Region
, optional- Additional screen regions to mark as dirty.
repaint
:bool
, optional- Repaint the widget (will call render() again). Defaults to True.
layout
:bool
, optional- Also layout widgets in the view. Defaults to False.
Expand source code
def refresh( self, *regions: Region, repaint: bool = True, layout: bool = False ) -> None: """Initiate a refresh of the widget. This method sets an internal flag to perform a refresh, which will be done on the next idle event. Only one refresh will be done even if this method is called multiple times. By default this method will cause the content of the widget to refresh, but not change its size. You can also set `layout=True` to perform a layout. !!! warning It is rarely necessary to call this method explicitly. Updating styles or reactive attributes will do this automatically. Args: *regions (Region, optional): Additional screen regions to mark as dirty. repaint (bool, optional): Repaint the widget (will call render() again). Defaults to True. layout (bool, optional): Also layout widgets in the view. Defaults to False. """ if layout: self._layout_required = True if isinstance(self._parent, Widget): self._parent._clear_arrangement_cache() if repaint: self._set_dirty(*regions) self._content_width_cache = (None, 0) self._content_height_cache = (None, 0) self._rich_style_cache.clear() self._repaint_required = True self.check_idle()
def release_mouse(self) ‑> None
-
Release the mouse.
Mouse events will only be sent when the mouse is over the widget.
Expand source code
def release_mouse(self) -> None: """Release the mouse. Mouse events will only be sent when the mouse is over the widget. """ self.app.capture_mouse(None)
def remove(self) ‑> None
-
Remove the Widget from the DOM (effectively deleting it)
Expand source code
def remove(self) -> None: """Remove the Widget from the DOM (effectively deleting it)""" self.app.post_message_no_wait(events.Remove(self, widget=self))
def render(self) ‑> Union[rich.console.ConsoleRenderable, rich.console.RichCast, str]
-
Get renderable for widget.
Returns
RenderableType
- Any renderable
Expand source code
def render(self) -> RenderableType: """Get renderable for widget. Returns: RenderableType: Any renderable """ render = "" if self.is_container else self.css_identifier_styled return render
def render_line(self, y: int) ‑> list[Segment]
-
Render a line of content.
Args
y
:int
- Y Coordinate of line.
Returns
list[Segment]
- A rendered line.
Expand source code
def render_line(self, y: int) -> list[Segment]: """Render a line of content. Args: y (int): Y Coordinate of line. Returns: list[Segment]: A rendered line. """ if self._dirty_regions: self._render_content() try: line = self._render_cache.lines[y] except IndexError: line = [Segment(" " * self.size.width, self.rich_style)] return line
def render_lines(self, crop: Region) ‑> List[List[rich.segment.Segment]]
-
Render the widget in to lines.
Args
crop
:Region
- Region within visible area to render.
Returns
Lines
- A list of list of segments.
Expand source code
def render_lines(self, crop: Region) -> Lines: """Render the widget in to lines. Args: crop (Region): Region within visible area to render. Returns: Lines: A list of list of segments. """ lines = self._styles_cache.render_widget(self, crop) return lines
def reset_focus(self) ‑> None
-
Reset the focus (move it to the next available widget).
Expand source code
def reset_focus(self) -> None: """Reset the focus (move it to the next available widget).""" try: self.screen._reset_focus(self) except NoScreen: pass
def scroll_down(self, *, animate: bool = True, speed: float | None = None, duration: float | None = None) ‑> bool
-
Scroll one line down.
Args
animate
:bool
, optional- Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns
bool
- True if any scrolling was done.
Expand source code
def scroll_down( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll one line down. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ return self.scroll_to( y=self.scroll_target_y + 1, animate=animate, speed=speed, duration=duration )
def scroll_end(self, *, animate: bool = True, speed: float | None = None, duration: float | None = None) ‑> bool
-
Scroll to the end of the container.
Args
animate
:bool
, optional- Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns
bool
- True if any scrolling was done.
Expand source code
def scroll_end( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll to the end of the container. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ if speed is None and duration is None: duration = 1.0 return self.scroll_to( 0, self.max_scroll_y, animate=animate, speed=speed, duration=duration )
def scroll_home(self, *, animate: bool = True, speed: float | None = None, duration: float | None = None) ‑> bool
-
Scroll to home position.
Args
animate
:bool
, optional- Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns
bool
- True if any scrolling was done.
Expand source code
def scroll_home( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll to home position. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ if speed is None and duration is None: duration = 1.0 return self.scroll_to(0, 0, animate=animate, speed=speed, duration=duration)
def scroll_left(self, *, animate: bool = True, speed: float | None = None, duration: float | None = None) ‑> bool
-
Scroll one cell left.
Args
animate
:bool
, optional- Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns
bool
- True if any scrolling was done.
Expand source code
def scroll_left( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll one cell left. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ return self.scroll_to( x=self.scroll_target_x - 1, animate=animate, speed=speed, duration=duration )
def scroll_page_down(self, *, animate: bool = True, speed: float | None = None, duration: float | None = None) ‑> bool
-
Scroll one page down.
Args
animate
:bool
, optional- Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns
bool
- True if any scrolling was done.
Expand source code
def scroll_page_down( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll one page down. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ return self.scroll_to( y=self.scroll_target_y + self.container_size.height, animate=animate, speed=speed, duration=duration, )
def scroll_page_left(self, *, animate: bool = True, speed: float | None = None, duration: float | None = None) ‑> bool
-
Scroll one page left.
Args
animate
:bool
, optional- Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns
bool
- True if any scrolling was done.
Expand source code
def scroll_page_left( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll one page left. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ if speed is None and duration is None: duration = 0.3 return self.scroll_to( x=self.scroll_target_x - self.container_size.width, animate=animate, speed=speed, duration=duration, )
def scroll_page_right(self, *, animate: bool = True, speed: float | None = None, duration: float | None = None) ‑> bool
-
Scroll one page right.
Args
animate
:bool
, optional- Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns
bool
- True if any scrolling was done.
Expand source code
def scroll_page_right( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll one page right. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ if speed is None and duration is None: duration = 0.3 return self.scroll_to( x=self.scroll_target_x + self.container_size.width, animate=animate, speed=speed, duration=duration, )
def scroll_page_up(self, *, animate: bool = True, speed: float | None = None, duration: float | None = None) ‑> bool
-
Scroll one page up.
Args
animate
:bool
, optional- Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns
bool
- True if any scrolling was done.
Expand source code
def scroll_page_up( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll one page up. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ return self.scroll_to( y=self.scroll_target_y - self.container_size.height, animate=animate, speed=speed, duration=duration, )
def scroll_relative(self, x: float | None = None, y: float | None = None, *, animate: bool = True, speed: float | None = None, duration: float | None = None) ‑> bool
-
Scroll relative to current position.
Args
- x (int | None, optional): X distance (columns) to scroll, or
None
for no change. Defaults to None. - y (int | None, optional): Y distance (rows) to scroll, or
None
for no change. Defaults to None. animate
:bool
, optional- Animate to new scroll position. Defaults to False.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns
bool
- True if the scroll position changed, otherwise False.
Expand source code
def scroll_relative( self, x: float | None = None, y: float | None = None, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll relative to current position. Args: x (int | None, optional): X distance (columns) to scroll, or ``None`` for no change. Defaults to None. y (int | None, optional): Y distance (rows) to scroll, or ``None`` for no change. Defaults to None. animate (bool, optional): Animate to new scroll position. Defaults to False. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if the scroll position changed, otherwise False. """ return self.scroll_to( None if x is None else (self.scroll_x + x), None if y is None else (self.scroll_y + y), animate=animate, speed=speed, duration=duration, )
- x (int | None, optional): X distance (columns) to scroll, or
def scroll_right(self, *, animate: bool = True, speed: float | None = None, duration: float | None = None) ‑> bool
-
Scroll on cell right.
Args
animate
:bool
, optional- Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns
bool
- True if any scrolling was done.
Expand source code
def scroll_right( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll on cell right. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ return self.scroll_to( x=self.scroll_target_x + 1, animate=animate, speed=speed, duration=duration )
def scroll_to(self, x: float | None = None, y: float | None = None, *, animate: bool = True, speed: float | None = None, duration: float | None = None) ‑> bool
-
Scroll to a given (absolute) coordinate, optionally animating.
Args
- x (int | None, optional): X coordinate (column) to scroll to, or None for no change. Defaults to None.
- y (int | None, optional): Y coordinate (row) to scroll to, or None for no change. Defaults to None.
animate
:bool
, optional- Animate to new scroll position. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns
bool
- True if the scroll position changed, otherwise False.
Expand source code
def scroll_to( self, x: float | None = None, y: float | None = None, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll to a given (absolute) coordinate, optionally animating. Args: x (int | None, optional): X coordinate (column) to scroll to, or None for no change. Defaults to None. y (int | None, optional): Y coordinate (row) to scroll to, or None for no change. Defaults to None. animate (bool, optional): Animate to new scroll position. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if the scroll position changed, otherwise False. """ scrolled_x = scrolled_y = False if animate: # TODO: configure animation speed if duration is None and speed is None: speed = 50 if x is not None: self.scroll_target_x = x if x != self.scroll_x: self.animate( "scroll_x", self.scroll_target_x, speed=speed, duration=duration, easing="out_cubic", ) scrolled_x = True if y is not None: self.scroll_target_y = y if y != self.scroll_y: self.animate( "scroll_y", self.scroll_target_y, speed=speed, duration=duration, easing="out_cubic", ) scrolled_y = True else: if x is not None: scroll_x = self.scroll_x self.scroll_target_x = self.scroll_x = x scrolled_x = scroll_x != self.scroll_x if y is not None: scroll_y = self.scroll_y self.scroll_target_y = self.scroll_y = y scrolled_y = scroll_y != self.scroll_y return scrolled_x or scrolled_y
def scroll_to_region(self, region: Region, *, spacing: Spacing | None = None, animate: bool = True, speed: float | None = None, duration: float | None = None, top: bool = False) ‑> Offset
-
Scrolls a given region in to view, if required.
This method will scroll the least distance required to move
region
fully within the scrollable area.Args
region
:Region
- A region that should be visible.
- spacing (Spacing | None, optional): Optional spacing around the region. Defaults to None.
animate
:bool
, optional- True to animate, or False to jump. Defaults to True.
- speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration.
- duration (float | None, optional): Duration of animation, if animate is True and speed is None.
top
:bool
, optional- Scroll region to top of container. Defaults to False.
Returns
Offset
- The distance that was scrolled.
Expand source code
def scroll_to_region( self, region: Region, *, spacing: Spacing | None = None, animate: bool = True, speed: float | None = None, duration: float | None = None, top: bool = False, ) -> Offset: """Scrolls a given region in to view, if required. This method will scroll the least distance required to move `region` fully within the scrollable area. Args: region (Region): A region that should be visible. spacing (Spacing | None, optional): Optional spacing around the region. Defaults to None. animate (bool, optional): True to animate, or False to jump. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. top (bool, optional): Scroll region to top of container. Defaults to False. Returns: Offset: The distance that was scrolled. """ window = self.content_region.at_offset(self.scroll_offset) if spacing is not None: window = window.shrink(spacing) if window in region: return Offset() delta_x, delta_y = Region.get_scroll_to_visible(window, region, top=top) scroll_x, scroll_y = self.scroll_offset delta = Offset( clamp(scroll_x + delta_x, 0, self.max_scroll_x) - scroll_x, clamp(scroll_y + delta_y, 0, self.max_scroll_y) - scroll_y, ) if delta: if speed is None and duration is None: duration = 0.2 self.scroll_relative( delta.x or None, delta.y or None, animate=animate if (abs(delta_y) > 1 or delta_x) else False, speed=speed, duration=duration, ) return delta
def scroll_to_widget(self, widget: Widget, *, animate: bool = True, speed: float | None = None, duration: float | None = None, top: bool = False) ‑> bool
-
Scroll scrolling to bring a widget in to view.
Args
widget
:Widget
- A descendant widget.
animate
:bool
, optional- True to animate, or False to jump. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns
bool
- True if any scrolling has occurred in any descendant, otherwise False.
Expand source code
def scroll_to_widget( self, widget: Widget, *, animate: bool = True, speed: float | None = None, duration: float | None = None, top: bool = False, ) -> bool: """Scroll scrolling to bring a widget in to view. Args: widget (Widget): A descendant widget. animate (bool, optional): True to animate, or False to jump. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling has occurred in any descendant, otherwise False. """ # Grow the region by the margin so to keep the margin in view. region = widget.virtual_region_with_margin scrolled = False while isinstance(widget.parent, Widget) and widget is not self: container = widget.parent scroll_offset = container.scroll_to_region( region, spacing=widget.parent.gutter, animate=animate, speed=speed, duration=duration, top=top, ) if scroll_offset: scrolled = True # Adjust the region by the amount we just scrolled it, and convert to # it's parent's virtual coordinate system. region = ( ( region.translate(-scroll_offset) .translate(-widget.scroll_offset) .translate(container.virtual_region.offset) ) .grow(container.styles.margin) .intersection(container.virtual_region) ) widget = container return scrolled
def scroll_up(self, *, animate: bool = True, speed: float | None = None, duration: float | None = None) ‑> bool
-
Scroll one line up.
Args
animate
:bool
, optional- Animate scroll. Defaults to True.
speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None.
Returns
bool
- True if any scrolling was done.
Expand source code
def scroll_up( self, *, animate: bool = True, speed: float | None = None, duration: float | None = None, ) -> bool: """Scroll one line up. Args: animate (bool, optional): Animate scroll. Defaults to True. speed (float | None, optional): Speed of scroll if animate is True. Or None to use duration. duration (float | None, optional): Duration of animation, if animate is True and speed is None. Returns: bool: True if any scrolling was done. """ return self.scroll_to( y=self.scroll_target_y - 1, animate=animate, speed=speed, duration=duration )
def scroll_visible(self, animate: bool = True, *, speed: float | None = None, duration: float | None = None, top: bool = False) ‑> None
-
Scroll the container to make this widget visible.
Args
animate
:bool
, optional- description. Defaults to True.
- speed (float | None, optional): description. Defaults to None.
- duration (float | None, optional): description. Defaults to None.
top
:bool
, optional- Scroll to top of container. Defaults to False.
Expand source code
def scroll_visible( self, animate: bool = True, *, speed: float | None = None, duration: float | None = None, top: bool = False, ) -> None: """Scroll the container to make this widget visible. Args: animate (bool, optional): _description_. Defaults to True. speed (float | None, optional): _description_. Defaults to None. duration (float | None, optional): _description_. Defaults to None. top (bool, optional): Scroll to top of container. Defaults to False. """ parent = self.parent if isinstance(parent, Widget): self.call_later( parent.scroll_to_widget, self, animate=animate, speed=speed, duration=duration, top=top, )
def validate_scroll_target_x(self, value: float) ‑> float
-
Expand source code
def validate_scroll_target_x(self, value: float) -> float: return clamp(value, 0, self.max_scroll_x)
def validate_scroll_target_y(self, value: float) ‑> float
-
Expand source code
def validate_scroll_target_y(self, value: float) -> float: return clamp(value, 0, self.max_scroll_y)
def validate_scroll_x(self, value: float) ‑> float
-
Expand source code
def validate_scroll_x(self, value: float) -> float: return clamp(value, 0, self.max_scroll_x)
def validate_scroll_y(self, value: float) ‑> float
-
Expand source code
def validate_scroll_y(self, value: float) -> float: return clamp(value, 0, self.max_scroll_y)
def watch_has_focus(self, value: bool) ‑> None
-
Update from CSS if has focus state changes.
Expand source code
def watch_has_focus(self, value: bool) -> None: """Update from CSS if has focus state changes.""" self.app.update_styles(self)
def watch_hover_style(self, previous_hover_style: Style, hover_style: Style) ‑> None
-
Expand source code
def watch_hover_style( self, previous_hover_style: Style, hover_style: Style ) -> None: if self.auto_links: self.highlight_link_id = hover_style.link_id
def watch_mouse_over(self, value: bool) ‑> None
-
Update from CSS if mouse over state changes.
Expand source code
def watch_mouse_over(self, value: bool) -> None: """Update from CSS if mouse over state changes.""" if self._has_hover_style: self.app.update_styles(self)
def watch_scroll_x(self, new_value: float) ‑> None
-
Expand source code
def watch_scroll_x(self, new_value: float) -> None: if self.show_horizontal_scrollbar: self.horizontal_scrollbar.position = int(new_value) self.horizontal_scrollbar.refresh() self.refresh(layout=True)
def watch_scroll_y(self, new_value: float) ‑> None
-
Expand source code
def watch_scroll_y(self, new_value: float) -> None: if self.show_vertical_scrollbar: self.vertical_scrollbar.position = int(new_value) self.vertical_scrollbar.refresh() self.refresh(layout=True)
Inherited members
DOMNode
:add_class
ancestors
app
background_colors
call_later
check_idle
classes
colors
css_identifier
css_identifier_styled
css_path_nodes
disable_messages
dispatch_key
display
displayed_children
emit
emit_no_wait
enable_messages
get_child
get_component_styles
get_default_css
has_class
has_pseudo_class
id
log
on_event
parent
post_message_no_wait
pseudo_classes
query
query_one
remove_class
reset_styles
rich_style
screen
set_class
set_interval
set_styles
set_timer
text_style
toggle_class
tree
visible
walk_children