New demo

CHANGELOG.md

@@ -5,6 +5,24 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+
+## Unreleased
+
+### Changed
+
+- Grid will now size children to the maximum height of a row https://github.com/Textualize/textual/pull/5113
+- Markdown links will be opened with `App.open_url` automatically https://github.com/Textualize/textual/pull/5113
+- The universal selector (`*`) will now not match widgets with the class `-textual-system` (scrollbars, notifications etc) https://github.com/Textualize/textual/pull/5113
+
+### Added
+
+- Added Link widget https://github.com/Textualize/textual/pull/5113
+- Added `open_links` to `Markdown` and `MarkdownViewer` widgets https://github.com/Textualize/textual/pull/5113
+- Added `App.DEFAULT_MODE` https://github.com/Textualize/textual/pull/5113
+- Added `Containers.HorizontalGroup` and `Containers.VerticalGroup` https://github.com/Textualize/textual/pull/5113
+- Added `$`, `£`, `€`, `(`, `)` symbols to Digits https://github.com/Textualize/textual/pull/5113
+- Added `Button.action` parameter to invoke action when clicked https://github.com/Textualize/textual/pull/5113
+
 ## [0.84.0] - 2024-10-22
 
 ### Fixed

docs/api/layout.md

@@ -0,0 +1,6 @@
+---
+title: "textual.layout"
+---
+
+
+::: textual.layout

docs/examples/widgets/link.py

@@ -0,0 +1,23 @@
+from textual.app import App, ComposeResult
+from textual.widgets import Link
+
+
+class LabelApp(App):
+    AUTO_FOCUS = None
+    CSS = """
+    Screen {
+        align: center middle;
+    }
+    """
+
+    def compose(self) -> ComposeResult:
+        yield Link(
+            "Go to textualize.io",
+            url="https://textualize.io",
+            tooltip="Click me",
+        )
+
+
+if __name__ == "__main__":
+    app = LabelApp()
+    app.run()

docs/widget_gallery.md

@@ -121,6 +121,13 @@ A simple text label.
 [Label reference](./widgets/label.md){ .md-button .md-button--primary }
 
 
+## Link
+
+A clickable link that opens a URL.
+
+[Link reference](./widgets/link.md){ .md-button .md-button--primary }
+
+
 ## ListView
 
 Display a list of items (items may be other widgets).

docs/widgets/link.md

@@ -0,0 +1,61 @@
+# Link
+
+!!! tip "Added in version 0.84.0"
+
+A widget to display a piece of text that opens a URL when clicked, like a web browser link.
+
+- [x] Focusable
+- [ ] Container
+
+
+## Example
+
+A trivial app with a link.
+Clicking the link open's a web-browser—as you might expect!
+
+=== "Output"
+
+    ```{.textual path="docs/examples/widgets/link.py"}
+    ```
+
+=== "link.py"
+
+    ```python
+    --8<-- "docs/examples/widgets/link.py"
+    ```
+
+
+## Reactive Attributes
+
+| Name   | Type  | Default | Description                               |
+| ------ | ----- | ------- | ----------------------------------------- |
+| `text` | `str` | `""`    | The text of the link.                     |
+| `url`  | `str` | `""`    | The URL to open when the link is clicked. |
+
+
+## Messages
+
+This widget sends no messages.
+
+## Bindings
+
+The Link widget defines the following bindings:
+
+::: textual.widgets.Link.BINDINGS
+    options:
+      show_root_heading: false
+      show_root_toc_entry: false
+
+
+## Component classes
+
+This widget contains no component classes.
+
+
+
+---
+
+
+::: textual.widgets.Link
+    options:
+      heading_level: 2

docs/widgets/masked_input.md

@@ -16,7 +16,7 @@ The example below shows a masked input to ease entering a credit card number.
     ```{.textual path="docs/examples/widgets/masked_input.py"}
     ```
 
-=== "checkbox.py"
+=== "masked_input.py"
 
     ```python
     --8<-- "docs/examples/widgets/masked_input.py"

mkdocs-nav.yml

@@ -152,6 +152,7 @@ nav:
           - "widgets/index.md"
           - "widgets/input.md"
           - "widgets/label.md"
+          - "widgets/link.md"
           - "widgets/list_item.md"
           - "widgets/list_view.md"
           - "widgets/loading_indicator.md"
@@ -195,6 +196,7 @@ nav:
       - "api/filter.md"
       - "api/fuzzy_matcher.md"
       - "api/geometry.md"
+      - "api/layout.md"
       - "api/lazy.md"
       - "api/logger.md"
       - "api/logging.md"

src/textual/_arrange.py

@@ -5,9 +5,9 @@
 from operator import attrgetter
 from typing import TYPE_CHECKING, Iterable, Mapping, Sequence
 
-from textual._layout import DockArrangeResult, WidgetPlacement
 from textual._partition import partition
 from textual.geometry import Region, Size, Spacing
+from textual.layout import DockArrangeResult, WidgetPlacement
 
 if TYPE_CHECKING:
     from textual.widget import Widget
@@ -90,7 +90,7 @@ def arrange(
 
         if layout_widgets:
             # Arrange layout widgets (i.e. not docked)
-            layout_placements = widget._layout.arrange(
+            layout_placements = widget.layout.arrange(
                 widget,
                 layout_widgets,
                 dock_region.size,

src/textual/_resolve.py

@@ -21,6 +21,7 @@ def resolve(
     gutter: int,
     size: Size,
     viewport: Size,
+    min_size: int | None = None,
 ) -> list[tuple[int, int]]:
     """Resolve a list of dimensions.
 
@@ -62,6 +63,11 @@ def resolve(
             "list[Fraction]", [fraction for _, fraction in resolved]
         )
 
+    if min_size is not None:
+        resolved_fractions = [
+            max(Fraction(min_size), fraction) for fraction in resolved_fractions
+        ]
+
     fraction_gutter = Fraction(gutter)
     offsets = [0] + [
         int(fraction)

src/textual/app.py

@@ -371,7 +371,7 @@ class App(Generic[ReturnType], DOMNode):
             overflow-y: auto !important;
             align: center middle;
             .-maximized {
-                dock: initial !important;
+                dock: initial !important;                
             }
         }
         /* Fade the header title when app is blurred */
@@ -413,6 +413,9 @@ class MyApp(App[None]):
             ...
         ```
     """
+    DEFAULT_MODE: ClassVar[str] = "_default"
+    """Name of the default mode."""
+
     SCREENS: ClassVar[dict[str, Callable[[], Screen[Any]]]] = {}
     """Screens associated with the app for the lifetime of the app."""
 
@@ -490,6 +493,9 @@ class MyApp(App[None]):
     SUSPENDED_SCREEN_CLASS: ClassVar[str] = ""
     """Class to apply to suspended screens, or empty string for no class."""
 
+    HOVER_EFFECTS_SCROLL_PAUSE: ClassVar[float] = 0.2
+    """Seconds to pause hover effects for when scrolling."""
+
     _PSEUDO_CLASSES: ClassVar[dict[str, Callable[[App], bool]]] = {
         "focus": lambda app: app.app_focus,
         "blur": lambda app: not app.app_focus,
@@ -587,9 +593,9 @@ def __init__(
         self._workers = WorkerManager(self)
         self.error_console = Console(markup=False, highlight=False, stderr=True)
         self.driver_class = driver_class or self.get_driver_class()
-        self._screen_stacks: dict[str, list[Screen[Any]]] = {"_default": []}
+        self._screen_stacks: dict[str, list[Screen[Any]]] = {self.DEFAULT_MODE: []}
         """A stack of screens per mode."""
-        self._current_mode: str = "_default"
+        self._current_mode: str = self.DEFAULT_MODE
         """The current mode the app is in."""
         self._sync_available = False
 
@@ -775,6 +781,11 @@ def __init__(
         self._previous_inline_height: int | None = None
         """Size of previous inline update."""
 
+        self._paused_hover_effects: bool = False
+        """Have the hover effects been paused?"""
+
+        self._hover_effects_timer: Timer | None = None
+
         if self.ENABLE_COMMAND_PALETTE:
             for _key, binding in self._bindings:
                 if binding.action in {"command_palette", "app.command_palette"}:
@@ -2171,8 +2182,12 @@ def _init_mode(self, mode: str) -> AwaitMount:
 
         stack = self._screen_stacks.get(mode, [])
         if stack:
-            await_mount = AwaitMount(stack[0], [])
-        else:
+            # Mode already exists
+            # Return an dummy await
+            return AwaitMount(stack[0], [])
+
+        if mode in self._modes:
+            # Mode is defined in MODES
             _screen = self._modes[mode]
             if isinstance(_screen, Screen):
                 raise TypeError(
@@ -2183,6 +2198,17 @@ def _init_mode(self, mode: str) -> AwaitMount:
             screen, await_mount = self._get_screen(new_screen)
             stack.append(screen)
             self._load_screen_css(screen)
+            self.refresh_css()
+            screen.post_message(events.ScreenResume())
+        else:
+            # Mode is not defined
+            screen = self.get_default_screen()
+            stack.append(screen)
+            self._register(self, screen)
+            screen.post_message(events.ScreenResume())
+            await_mount = AwaitMount(stack[0], [])
+
+        screen._screen_resized(self.size)
 
         self._screen_stacks[mode] = stack
         return await_mount
@@ -2199,7 +2225,12 @@ def switch_mode(self, mode: str) -> AwaitMount:
 
         Raises:
             UnknownModeError: If trying to switch to an unknown mode.
+
         """
+
+        if mode == self._current_mode:
+            return AwaitMount(self.screen, [])
+
         if mode not in self._modes:
             raise UnknownModeError(f"No known mode {mode!r}")
 
@@ -2673,12 +2704,43 @@ def set_focus(self, widget: Widget | None, scroll_visible: bool = True) -> None:
         """
         self.screen.set_focus(widget, scroll_visible)
 
+    def _pause_hover_effects(self):
+        """Pause any hover effects based on Enter and Leave events for 200ms."""
+        if not self.HOVER_EFFECTS_SCROLL_PAUSE or self.is_headless:
+            return
+        self._paused_hover_effects = True
+        if self._hover_effects_timer is None:
+            self._hover_effects_timer = self.set_interval(
+                self.HOVER_EFFECTS_SCROLL_PAUSE, self._resume_hover_effects
+            )
+        else:
+            self._hover_effects_timer.reset()
+            self._hover_effects_timer.resume()
+
+    def _resume_hover_effects(self):
+        """Resume sending Enter and Leave for hover effects."""
+        if not self.HOVER_EFFECTS_SCROLL_PAUSE or self.is_headless:
+            return
+        if self._paused_hover_effects:
+            self._paused_hover_effects = False
+            if self._hover_effects_timer is not None:
+                self._hover_effects_timer.pause()
+            try:
+                widget, _ = self.screen.get_widget_at(*self.mouse_position)
+            except NoWidget:
+                pass
+            else:
+                if widget is not self.mouse_over:
+                    self._set_mouse_over(widget)
+
     def _set_mouse_over(self, widget: Widget | None) -> None:
         """Called when the mouse is over another widget.
 
         Args:
             widget: Widget under mouse, or None for no widgets.
         """
+        if self._paused_hover_effects:
+            return
         if widget is None:
             if self.mouse_over is not None:
                 try:
@@ -3505,10 +3567,7 @@ async def on_event(self, event: events.Event) -> None:
         # Handle input events that haven't been forwarded
         # If the event has been forwarded it may have bubbled up back to the App
         if isinstance(event, events.Compose):
-            screen: Screen[Any] = self.get_default_screen()
-            self._register(self, screen)
-            self._screen_stack.append(screen)
-            screen.post_message(events.ScreenResume())
+            await self._init_mode(self._current_mode)
             await super().on_event(event)
 
         elif isinstance(event, events.InputEvent) and not event.is_forwarded:

src/textual/color.py

@@ -332,7 +332,7 @@ def __rich_repr__(self) -> rich.repr.Result:
         yield g
         yield b
         yield "a", a, 1.0
-        yield "ansi", ansi
+        yield "ansi", ansi, None
 
     def with_alpha(self, alpha: float) -> Color:
         """Create a new color with the given alpha.