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# Change Log
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
- Breaking change: changed default behaviour of `Vertical` (see `VerticalScroll`) https://github.com/Textualize/textual/issues/1957
- The default `overflow` style for `Horizontal` was changed to `hidden hidden` https://github.com/Textualize/textual/issues/1957
### Added
- Added `HorizontalScroll` https://github.com/Textualize/textual/issues/1957
- Added `Center` https://github.com/Textualize/textual/issues/1957
- Added `Middle` https://github.com/Textualize/textual/issues/1957
- Added `VerticalScroll` (mimicking the old behaviour of `Vertical`) https://github.com/Textualize/textual/issues/1957
### Fixed
- Fixed container not resizing when a widget is removed https://github.com/Textualize/textual/issues/2007
- Fixes issue where the horizontal scrollbar would be incorrectly enabled https://github.com/Textualize/textual/pull/2024
## [0.15.0] - 2023-03-13
### Changed
- Fixed container not resizing when a widget is removed https://github.com/Textualize/textual/issues/2007
- Fixed issue where the horizontal scrollbar would be incorrectly enabled https://github.com/Textualize/textual/pull/2024
- Fixed `Pilot.click` not correctly creating the mouse events https://github.com/Textualize/textual/issues/2022
- Fixes issue where the horizontal scrollbar would be incorrectly enabled https://github.com/Textualize/textual/pull/2024
- Fixes for tracebacks not appearing on exit https://github.com/Textualize/textual/issues/2027
### Added
- Added a LoadingIndicator widget https://github.com/Textualize/textual/pull/2018
- Added Tabs Widget https://github.com/Textualize/textual/pull/2020
### Changed
- Breaking change: Renamed Widget.action and App.action to Widget.run_action and App.run_action
- Added `shift`, `meta` and `control` arguments to `Pilot.click`.
## [0.14.0] - 2023-03-09
### Changed
- Breaking change: There is now only `post_message` to post events, which is non-async, `post_message_no_wait` was dropped. https://github.com/Textualize/textual/pull/1940
- Breaking change: The Timer class now has just one method to stop it, `Timer.stop` which is non sync https://github.com/Textualize/textual/pull/1940
- Breaking change: Messages don't require a `sender` in their constructor https://github.com/Textualize/textual/pull/1940
- Many messages have grown a `control` property which returns the control they relate to. https://github.com/Textualize/textual/pull/1940
- Updated styling to make it clear DataTable grows horizontally https://github.com/Textualize/textual/pull/1946
- Changed the `Checkbox` character due to issues with Windows Terminal and Windows 10 https://github.com/Textualize/textual/issues/1934
- Changed the `RadioButton` character due to issues with Windows Terminal and Windows 10 and 11 https://github.com/Textualize/textual/issues/1934
- Changed the `Markdown` initial bullet character due to issues with Windows Terminal and Windows 10 and 11 https://github.com/Textualize/textual/issues/1982
- The underscore `_` is no longer a special alias for the method `pilot.press`
### Added
- Added `data_table` attribute to DataTable events https://github.com/Textualize/textual/pull/1940
- Added `list_view` attribute to `ListView` events https://github.com/Textualize/textual/pull/1940
- Added `radio_set` attribute to `RadioSet` events https://github.com/Textualize/textual/pull/1940
- Added `switch` attribute to `Switch` events https://github.com/Textualize/textual/pull/1940
- Added `hover` and `click` methods to `Pilot` https://github.com/Textualize/textual/pull/1966
- Breaking change: Added `toggle_button` attribute to RadioButton and Checkbox events, replaces `input` https://github.com/Textualize/textual/pull/1940
- A percentage alpha can now be applied to a border https://github.com/Textualize/textual/issues/1863
- Added `Color.multiply_alpha`.
- Added `ContentSwitcher` https://github.com/Textualize/textual/issues/1945
### Fixed
- Fixed bug that prevented pilot from pressing some keys https://github.com/Textualize/textual/issues/1815
- DataTable race condition that caused crash https://github.com/Textualize/textual/pull/1962
- Fixed scrollbar getting "stuck" to cursor when cursor leaves window during drag https://github.com/Textualize/textual/pull/1968 https://github.com/Textualize/textual/pull/2003
- DataTable crash when enter pressed when table is empty https://github.com/Textualize/textual/pull/1973
## [0.13.0] - 2023-03-02
### Added
- Added `Checkbox` https://github.com/Textualize/textual/pull/1872
- Added `RadioButton` https://github.com/Textualize/textual/pull/1872
- Added `RadioSet` https://github.com/Textualize/textual/pull/1872
### Changed
- Widget scrolling methods (such as `Widget.scroll_home` and `Widget.scroll_end`) now perform the scroll after the next refresh https://github.com/Textualize/textual/issues/1774
- Buttons no longer accept arbitrary renderables https://github.com/Textualize/textual/issues/1870
### Fixed
- Scrolling with cursor keys now moves just one cell https://github.com/Textualize/textual/issues/1897
- Fix exceptions in watch methods being hidden on startup https://github.com/Textualize/textual/issues/1886
- Fixed scrollbar size miscalculation https://github.com/Textualize/textual/pull/1910
- Fixed slow exit on some terminals https://github.com/Textualize/textual/issues/1920
## [0.12.1] - 2023-02-25
### Fixed
- Fix for batch update glitch https://github.com/Textualize/textual/pull/1880
## [0.12.0] - 2023-02-24
### Added
- Added `App.batch_update` https://github.com/Textualize/textual/pull/1832
- Added horizontal rule to Markdown https://github.com/Textualize/textual/pull/1832
- Added `Widget.disabled` https://github.com/Textualize/textual/pull/1785
- Added `DOMNode.notify_style_update` to replace `messages.StylesUpdated` message https://github.com/Textualize/textual/pull/1861
- Added `DataTable.show_row_labels` reactive to show and hide row labels https://github.com/Textualize/textual/pull/1868
- Added `DataTable.RowLabelSelected` event, which is emitted when a row label is clicked https://github.com/Textualize/textual/pull/1868
- Added `MessagePump.prevent` context manager to temporarily suppress a given message type https://github.com/Textualize/textual/pull/1866
### Changed
- Scrolling by page now adds to current position.
- Markdown lists have been polished: a selection of bullets, better alignment of numbers, style tweaks https://github.com/Textualize/textual/pull/1832
- Added alternative method of composing Widgets https://github.com/Textualize/textual/pull/1847
- Added `label` parameter to `DataTable.add_row` https://github.com/Textualize/textual/pull/1868
- Breaking change: Some `DataTable` component classes were renamed - see PR for details https://github.com/Textualize/textual/pull/1868
### Removed
- Removed `screen.visible_widgets` and `screen.widgets`
- Removed `StylesUpdate` message. https://github.com/Textualize/textual/pull/1861
### Fixed
- Numbers in a descendant-combined selector no longer cause an error https://github.com/Textualize/textual/issues/1836
- Fixed superfluous scrolling when focusing a docked widget https://github.com/Textualize/textual/issues/1816
- Fixes walk_children which was returning more than one screen https://github.com/Textualize/textual/issues/1846
- Fixed issue with watchers fired for detached nodes https://github.com/Textualize/textual/issues/1846
## [0.11.1] - 2023-02-17
### Fixed
- DataTable fix issue where offset cache was not being used https://github.com/Textualize/textual/pull/1810
- DataTable scrollbars resize correctly when header is toggled https://github.com/Textualize/textual/pull/1803
- DataTable location mapping cleared when clear called https://github.com/Textualize/textual/pull/1809
## [0.11.0] - 2023-02-15
### Added
- Added `TreeNode.expand_all` https://github.com/Textualize/textual/issues/1430
- Added `TreeNode.collapse_all` https://github.com/Textualize/textual/issues/1430
- Added `TreeNode.toggle_all` https://github.com/Textualize/textual/issues/1430
- Added the coroutines `Animator.wait_until_complete` and `pilot.wait_for_scheduled_animations` that allow waiting for all current and scheduled animations https://github.com/Textualize/textual/issues/1658
- Added the method `Animator.is_being_animated` that checks if an attribute of an object is being animated or is scheduled for animation
- Added more keyboard actions and related bindings to `Input` https://github.com/Textualize/textual/pull/1676
- Added App.scroll_sensitivity_x and App.scroll_sensitivity_y to adjust how many lines the scroll wheel moves the scroll position https://github.com/Textualize/textual/issues/928
- Added Shift+scroll wheel and ctrl+scroll wheel to scroll horizontally
- Added `Tree.action_toggle_node` to toggle a node without selecting, and bound it to <kbd>Space</kbd> https://github.com/Textualize/textual/issues/1433
- Added `Tree.reset` to fully reset a `Tree` https://github.com/Textualize/textual/issues/1437
- Added `DataTable.sort` to sort rows https://github.com/Textualize/textual/pull/1638
- Added `DataTable.get_cell` to retrieve a cell by column/row keys https://github.com/Textualize/textual/pull/1638
- Added `DataTable.get_cell_at` to retrieve a cell by coordinate https://github.com/Textualize/textual/pull/1638
- Added `DataTable.update_cell` to update a cell by column/row keys https://github.com/Textualize/textual/pull/1638
- Added `DataTable.update_cell_at` to update a cell at a coordinate https://github.com/Textualize/textual/pull/1638
- Added `DataTable.ordered_rows` property to retrieve `Row`s as they're currently ordered https://github.com/Textualize/textual/pull/1638
- Added `DataTable.ordered_columns` property to retrieve `Column`s as they're currently ordered https://github.com/Textualize/textual/pull/1638
- Added `DataTable.coordinate_to_cell_key` to find the key for the cell at a coordinate https://github.com/Textualize/textual/pull/1638
- Added `DataTable.is_valid_coordinate` https://github.com/Textualize/textual/pull/1638
- Added `DataTable.is_valid_row_index` https://github.com/Textualize/textual/pull/1638
- Added `DataTable.is_valid_column_index` https://github.com/Textualize/textual/pull/1638
- Added attributes to events emitted from `DataTable` indicating row/column/cell keys https://github.com/Textualize/textual/pull/1638
- Added `DataTable.get_row` to retrieve the values from a row by key https://github.com/Textualize/textual/pull/1786
- Added `DataTable.get_row_at` to retrieve the values from a row by index https://github.com/Textualize/textual/pull/1786
- Added `DataTable.get_column` to retrieve the values from a column by key https://github.com/Textualize/textual/pull/1786
- Added `DataTable.get_column_at` to retrieve the values from a column by index https://github.com/Textualize/textual/pull/1786
- Added `DataTable.HeaderSelected` which is posted when header label clicked https://github.com/Textualize/textual/pull/1788
- Added `DOMNode.watch` and `DOMNode.is_attached` methods https://github.com/Textualize/textual/pull/1750
- Added `DOMNode.css_tree` which is a renderable that shows the DOM and CSS https://github.com/Textualize/textual/pull/1778
- Added `DOMNode.children_view` which is a view on to a nodes children list, use for querying https://github.com/Textualize/textual/pull/1778
- Added `Markdown` and `MarkdownViewer` widgets.
- Added `--screenshot` option to `textual run`
### Changed
- Breaking change: `TreeNode` can no longer be imported from `textual.widgets`; it is now available via `from textual.widgets.tree import TreeNode`. https://github.com/Textualize/textual/pull/1637
- `Tree` now shows a (subdued) cursor for a highlighted node when focus has moved elsewhere https://github.com/Textualize/textual/issues/1471
- `DataTable.add_row` now accepts `key` argument to uniquely identify the row https://github.com/Textualize/textual/pull/1638
- `DataTable.add_column` now accepts `key` argument to uniquely identify the column https://github.com/Textualize/textual/pull/1638
- `DataTable.add_row` and `DataTable.add_column` now return lists of keys identifying the added rows/columns https://github.com/Textualize/textual/pull/1638
- Breaking change: `DataTable.get_cell_value` renamed to `DataTable.get_value_at` https://github.com/Textualize/textual/pull/1638
- `DataTable.row_count` is now a property https://github.com/Textualize/textual/pull/1638
- Breaking change: `DataTable.cursor_cell` renamed to `DataTable.cursor_coordinate` https://github.com/Textualize/textual/pull/1638
- The method `validate_cursor_cell` was renamed to `validate_cursor_coordinate`.
- The method `watch_cursor_cell` was renamed to `watch_cursor_coordinate`.
- Breaking change: `DataTable.hover_cell` renamed to `DataTable.hover_coordinate` https://github.com/Textualize/textual/pull/1638
- The method `validate_hover_cell` was renamed to `validate_hover_coordinate`.
- Breaking change: `DataTable.data` structure changed, and will be made private in upcoming release https://github.com/Textualize/textual/pull/1638
- Breaking change: `DataTable.refresh_cell` was renamed to `DataTable.refresh_coordinate` https://github.com/Textualize/textual/pull/1638
- Breaking change: `DataTable.get_row_height` now takes a `RowKey` argument instead of a row index https://github.com/Textualize/textual/pull/1638
- Breaking change: `DataTable.data` renamed to `DataTable._data` (it's now private) https://github.com/Textualize/textual/pull/1786
- The `_filter` module was made public (now called `filter`) https://github.com/Textualize/textual/pull/1638
- Breaking change: renamed `Checkbox` to `Switch` https://github.com/Textualize/textual/issues/1746
- `App.install_screen` name is no longer optional https://github.com/Textualize/textual/pull/1778
- `App.query` now only includes the current screen https://github.com/Textualize/textual/pull/1778
- `DOMNode.tree` now displays simple DOM structure only https://github.com/Textualize/textual/pull/1778
- `App.install_screen` now returns None rather than AwaitMount https://github.com/Textualize/textual/pull/1778
- `DOMNode.children` is now a simple sequence, the NodesList is exposed as `DOMNode._nodes` https://github.com/Textualize/textual/pull/1778
- `DataTable` cursor can now enter fixed columns https://github.com/Textualize/textual/pull/1799
### Fixed
- Fixed stuck screen https://github.com/Textualize/textual/issues/1632
- Fixed programmatic style changes not refreshing children layouts when parent widget did not change size https://github.com/Textualize/textual/issues/1607
- Fixed relative units in `grid-rows` and `grid-columns` being computed with respect to the wrong dimension https://github.com/Textualize/textual/issues/1406
- Fixed bug with animations that were triggered back to back, where the second one wouldn't start https://github.com/Textualize/textual/issues/1372
- Fixed bug with animations that were scheduled where all but the first would be skipped https://github.com/Textualize/textual/issues/1372
- Programmatically setting `overflow_x`/`overflow_y` refreshes the layout correctly https://github.com/Textualize/textual/issues/1616
- Fixed double-paste into `Input` https://github.com/Textualize/textual/issues/1657
- Added a workaround for an apparent Windows Terminal paste issue https://github.com/Textualize/textual/issues/1661
- Fixed issue with renderable width calculation https://github.com/Textualize/textual/issues/1685
- Fixed issue with app not processing Paste event https://github.com/Textualize/textual/issues/1666
- Fixed glitch with view position with auto width inputs https://github.com/Textualize/textual/issues/1693
- Fixed `DataTable` "selected" events containing wrong coordinates when mouse was used https://github.com/Textualize/textual/issues/1723
### Removed
- Methods `MessagePump.emit` and `MessagePump.emit_no_wait` https://github.com/Textualize/textual/pull/1738
- Removed `reactive.watch` in favor of DOMNode.watch.
## [0.10.1] - 2023-01-20
### Added
- Added Strip.text property https://github.com/Textualize/textual/issues/1620
### Fixed
- Fixed `textual diagnose` crash on older supported Python versions. https://github.com/Textualize/textual/issues/1622
### Changed
- The default filename for screenshots uses a datetime format similar to ISO8601, but with reserved characters replaced by underscores https://github.com/Textualize/textual/pull/1518
## [0.10.0] - 2023-01-19
### Added
- Added `TreeNode.parent` -- a read-only property for accessing a node's parent https://github.com/Textualize/textual/issues/1397
- Added public `TreeNode` label access via `TreeNode.label` https://github.com/Textualize/textual/issues/1396
- Added read-only public access to the children of a `TreeNode` via `TreeNode.children` https://github.com/Textualize/textual/issues/1398
- Added `Tree.get_node_by_id` to allow getting a node by its ID https://github.com/Textualize/textual/pull/1535
- Added a `Tree.NodeHighlighted` message, giving a `on_tree_node_highlighted` event handler https://github.com/Textualize/textual/issues/1400
- Added a `inherit_component_classes` subclassing parameter to control whether component classes are inherited from base classes https://github.com/Textualize/textual/issues/1399
- Added `diagnose` as a `textual` command https://github.com/Textualize/textual/issues/1542
- Added `row` and `column` cursors to `DataTable` https://github.com/Textualize/textual/pull/1547
- Added an optional parameter `selector` to the methods `Screen.focus_next` and `Screen.focus_previous` that enable using a CSS selector to narrow down which widgets can get focus https://github.com/Textualize/textual/issues/1196
### Changed
- `MouseScrollUp` and `MouseScrollDown` now inherit from `MouseEvent` and have attached modifier keys. https://github.com/Textualize/textual/pull/1458
- Fail-fast and print pretty tracebacks for Widget compose errors https://github.com/Textualize/textual/pull/1505
- Added Widget._refresh_scroll to avoid expensive layout when scrolling https://github.com/Textualize/textual/pull/1524
- `events.Paste` now bubbles https://github.com/Textualize/textual/issues/1434
- Improved error message when style flag `none` is mixed with other flags (e.g., when setting `text-style`) https://github.com/Textualize/textual/issues/1420
- Clock color in the `Header` widget now matches the header color https://github.com/Textualize/textual/issues/1459
- Programmatic calls to scroll now optionally scroll even if overflow styling says otherwise (introduces a new `force` parameter to all the `scroll_*` methods) https://github.com/Textualize/textual/issues/1201
- `COMPONENT_CLASSES` are now inherited from base classes https://github.com/Textualize/textual/issues/1399
- Watch methods may now take no parameters
- Added `compute` parameter to reactive
- A `TypeError` raised during `compose` now carries the full traceback
- Removed base class `NodeMessage` from which all node-related `Tree` events inherited
### Fixed
- The styles `scrollbar-background-active` and `scrollbar-color-hover` are no longer ignored https://github.com/Textualize/textual/pull/1480
- The widget `Placeholder` can now have its width set to `auto` https://github.com/Textualize/textual/pull/1508
- Behavior of widget `Input` when rendering after programmatic value change and related scenarios https://github.com/Textualize/textual/issues/1477 https://github.com/Textualize/textual/issues/1443
- `DataTable.show_cursor` now correctly allows cursor toggling https://github.com/Textualize/textual/pull/1547
- Fixed cursor not being visible on `DataTable` mount when `fixed_columns` were used https://github.com/Textualize/textual/pull/1547
- Fixed `DataTable` cursors not resetting to origin on `clear()` https://github.com/Textualize/textual/pull/1601
- Fixed TextLog wrapping issue https://github.com/Textualize/textual/issues/1554
- Fixed issue with TextLog not writing anything before layout https://github.com/Textualize/textual/issues/1498
- Fixed an exception when populating a child class of `ListView` purely from `compose` https://github.com/Textualize/textual/issues/1588
- Fixed freeze in tests https://github.com/Textualize/textual/issues/1608
- Fixed minus not displaying as symbol https://github.com/Textualize/textual/issues/1482
## [0.9.1] - 2022-12-30
### Added
- Added textual._win_sleep for Python on Windows < 3.11 https://github.com/Textualize/textual/pull/1457
## [0.9.0] - 2022-12-30
### Added
- Added textual.strip.Strip primitive
- Added textual._cache.FIFOCache
- Added an option to clear columns in DataTable.clear() https://github.com/Textualize/textual/pull/1427
### Changed
- Widget.render_line now returns a Strip
- Fix for slow updates on Windows
- Bumped Rich dependency
## [0.8.2] - 2022-12-28
### Fixed
- Fixed issue with TextLog.clear() https://github.com/Textualize/textual/issues/1447
## [0.8.1] - 2022-12-25
### Fixed
- Fix for overflowing tree issue https://github.com/Textualize/textual/issues/1425
## [0.8.0] - 2022-12-22
### Fixed
- Fixed issues with nested auto dimensions https://github.com/Textualize/textual/issues/1402
- Fixed watch method incorrectly running on first set when value hasn't changed and init=False https://github.com/Textualize/textual/pull/1367
- `App.dark` can now be set from `App.on_load` without an error being raised https://github.com/Textualize/textual/issues/1369
- Fixed setting `visibility` changes needing a `refresh` https://github.com/Textualize/textual/issues/1355
### Added
- Added `textual.actions.SkipAction` exception which can be raised from an action to allow parents to process bindings.
- Added `textual keys` preview.
- Added ability to bind to a character in addition to key name. i.e. you can bind to "." or "full_stop".
- Added TextLog.shrink attribute to allow renderable to reduce in size to fit width.
### Changed
- Deprecated `PRIORITY_BINDINGS` class variable.
- Renamed `char` to `character` on Key event.
- Renamed `key_name` to `name` on Key event.
- Queries/`walk_children` no longer includes self in results by default https://github.com/Textualize/textual/pull/1416
## [0.7.0] - 2022-12-17
### Added
- Added `PRIORITY_BINDINGS` class variable, which can be used to control if a widget's bindings have priority by default. https://github.com/Textualize/textual/issues/1343
### Changed
- Renamed the `Binding` argument `universal` to `priority`. https://github.com/Textualize/textual/issues/1343
- When looking for bindings that have priority, they are now looked from `App` downwards. https://github.com/Textualize/textual/issues/1343
- `BINDINGS` on an `App`-derived class have priority by default. https://github.com/Textualize/textual/issues/1343
- `BINDINGS` on a `Screen`-derived class have priority by default. https://github.com/Textualize/textual/issues/1343
- Added a message parameter to Widget.exit
### Fixed
- Fixed validator not running on first reactive set https://github.com/Textualize/textual/pull/1359
- Ensure only printable characters are used as key_display https://github.com/Textualize/textual/pull/1361
## [0.6.0] - 2022-12-11
### Added
- Added "inherited bindings" -- BINDINGS classvar will be merged with base classes, unless inherit_bindings is set to False
- Added `Tree` widget which replaces `TreeControl`.
- Added widget `Placeholder` https://github.com/Textualize/textual/issues/1200.
### Changed
- Rebuilt `DirectoryTree` with new `Tree` control.
- Empty containers with a dimension set to `"auto"` will now collapse instead of filling up the available space.
- Container widgets now have default height of `1fr`.
- The default `width` of a `Label` is now `auto`.
### Fixed
- Type selectors can now contain numbers https://github.com/Textualize/textual/issues/1253
- Fixed visibility not affecting children https://github.com/Textualize/textual/issues/1313
- Fixed issue with auto width/height and relative children https://github.com/Textualize/textual/issues/1319
- Fixed issue with offset applied to containers https://github.com/Textualize/textual/issues/1256
- Fixed default CSS retrieval for widgets with no `DEFAULT_CSS` that inherited from widgets with `DEFAULT_CSS` https://github.com/Textualize/textual/issues/1335
- Fixed merging of `BINDINGS` when binding inheritance is set to `None` https://github.com/Textualize/textual/issues/1351
## [0.5.0] - 2022-11-20
### Added
- Add get_child_by_id and get_widget_by_id, remove get_child https://github.com/Textualize/textual/pull/1146
- Add easing parameter to Widget.scroll_* methods https://github.com/Textualize/textual/pull/1144
- Added Widget.call_later which invokes a callback on idle.
- `DOMNode.ancestors` no longer includes `self`.
- Added `DOMNode.ancestors_with_self`, which retains the old behaviour of
`DOMNode.ancestors`.
- Improved the speed of `DOMQuery.remove`.
- Added DataTable.clear
- Added low-level `textual.walk` methods.
- It is now possible to `await` a `Widget.remove`.
https://github.com/Textualize/textual/issues/1094
- It is now possible to `await` a `DOMQuery.remove`. Note that this changes
the return value of `DOMQuery.remove`, which used to return `self`.
https://github.com/Textualize/textual/issues/1094
- Added Pilot.wait_for_animation
- Added `Widget.move_child` https://github.com/Textualize/textual/issues/1121
- Added a `Label` widget https://github.com/Textualize/textual/issues/1190
- Support lazy-instantiated Screens (callables in App.SCREENS) https://github.com/Textualize/textual/pull/1185
- Display of keys in footer has more sensible defaults https://github.com/Textualize/textual/pull/1213
- Add App.get_key_display, allowing custom key_display App-wide https://github.com/Textualize/textual/pull/1213
### Changed
- Watchers are now called immediately when setting the attribute if they are synchronous. https://github.com/Textualize/textual/pull/1145
- Widget.call_later has been renamed to Widget.call_after_refresh.
- Button variant values are now checked at runtime. https://github.com/Textualize/textual/issues/1189
- Added caching of some properties in Styles object
### Fixed
- Fixed DataTable row not updating after add https://github.com/Textualize/textual/issues/1026
- Fixed issues with animation. Now objects of different types may be animated.
- Fixed containers with transparent background not showing borders https://github.com/Textualize/textual/issues/1175
- Fixed auto-width in horizontal containers https://github.com/Textualize/textual/pull/1155
- Fixed Input cursor invisible when placeholder empty https://github.com/Textualize/textual/pull/1202
- Fixed deadlock when removing widgets from the App https://github.com/Textualize/textual/pull/1219
## [0.4.0] - 2022-11-08
https://textual.textualize.io/blog/2022/11/08/version-040/#version-040
### Changed
- Dropped support for mounting "named" and "anonymous" widgets via
`App.mount` and `Widget.mount`. Both methods now simply take one or more
widgets as positional arguments.
- `DOMNode.query_one` now raises a `TooManyMatches` exception if there is
more than one matching node.
https://github.com/Textualize/textual/issues/1096
- `App.mount` and `Widget.mount` have new `before` and `after` parameters https://github.com/Textualize/textual/issues/778
### Added
- Added `init` param to reactive.watch
- `CSS_PATH` can now be a list of CSS files https://github.com/Textualize/textual/pull/1079
- Added `DOMQuery.only_one` https://github.com/Textualize/textual/issues/1096
- Writes to stdout are now done in a thread, for smoother animation. https://github.com/Textualize/textual/pull/1104
## [0.3.0] - 2022-10-31
### Fixed
- Fixed issue where scrollbars weren't being unmounted
- Fixed fr units for horizontal and vertical layouts https://github.com/Textualize/textual/pull/1067
- Fixed `textual run` breaking sys.argv https://github.com/Textualize/textual/issues/1064
- Fixed footer not updating styles when toggling dark mode
- Fixed how the app title in a `Header` is centred https://github.com/Textualize/textual/issues/1060
- Fixed the swapping of button variants https://github.com/Textualize/textual/issues/1048
- Fixed reserved characters in screenshots https://github.com/Textualize/textual/issues/993
- Fixed issue with TextLog max_lines https://github.com/Textualize/textual/issues/1058
### Changed
- DOMQuery now raises InvalidQueryFormat in response to invalid query strings, rather than cryptic CSS error
- Dropped quit_after, screenshot, and screenshot_title from App.run, which can all be done via auto_pilot
- Widgets are now closed in reversed DOM order
- Input widget justify hardcoded to left to prevent text-align interference
- Changed `textual run` so that it patches `argv` in more situations
- DOM classes and IDs are now always treated fully case-sensitive https://github.com/Textualize/textual/issues/1047
### Added
- Added Unmount event
- Added App.run_async method
- Added App.run_test context manager
- Added auto_pilot to App.run and App.run_async
- Added Widget._get_virtual_dom to get scrollbars
- Added size parameter to run and run_async
- Added always_update to reactive
- Returned an awaitable from push_screen, switch_screen, and install_screen https://github.com/Textualize/textual/pull/1061
## [0.2.1] - 2022-10-23
### Changed
- Updated meta data for PyPI
## [0.2.0] - 2022-10-23
### Added
- CSS support
- Too numerous to mention
## [0.1.18] - 2022-04-30
### Changed
- Bump typing extensions
## [0.1.17] - 2022-03-10
### Changed
- Bumped Rich dependency
## [0.1.16] - 2022-03-10
### Fixed
- Fixed escape key hanging on Windows
## [0.1.15] - 2022-01-31
### Added
- Added Windows Driver
## [0.1.14] - 2022-01-09
### Changed
- Updated Rich dependency to 11.X
## [0.1.13] - 2022-01-01
### Fixed
- Fixed spurious characters when exiting app
- Fixed increasing delay when exiting
## [0.1.12] - 2021-09-20
### Added
- Added geometry.Spacing
### Fixed
- Fixed calculation of virtual size in scroll views
## [0.1.11] - 2021-09-12
### Changed
- Changed message handlers to use prefix handle\_
- Renamed messages to drop the Message suffix
- Events now bubble by default
- Refactor of layout
### Added
- Added App.measure
- Added auto_width to Vertical Layout, WindowView, an ScrollView
- Added big_table.py example
- Added easing.py example
## [0.1.10] - 2021-08-25
### Added
- Added keyboard control of tree control
- Added Widget.gutter to calculate space between renderable and outside edge
- Added margin, padding, and border attributes to Widget
### Changed
- Callbacks may be async or non-async.
- Event handler event argument is optional.
- Fixed exception in clock example https://github.com/willmcgugan/textual/issues/52
- Added Message.wait() which waits for a message to be processed
- Key events are now sent to widgets first, before processing bindings
## [0.1.9] - 2021-08-06
### Added
- Added hover over and mouse click to activate keys in footer
- Added verbosity argument to Widget.log
### Changed
- Simplified events. Remove Startup event (use Mount)
- Changed geometry.Point to geometry.Offset and geometry.Dimensions to geometry.Size
## [0.1.8] - 2021-07-17
### Fixed
- Fixed exiting mouse mode
- Fixed slow animation
### Added
- New log system
## [0.1.7] - 2021-07-14
### Changed
- Added functionality to calculator example.
- Scrollview now shows scrollbars automatically
- New handler system for messages that doesn't require inheritance
- Improved traceback handling
[0.14.0]: https://github.com/Textualize/textual/compare/v0.13.0...v0.14.0
[0.13.0]: https://github.com/Textualize/textual/compare/v0.12.1...v0.13.0
[0.12.1]: https://github.com/Textualize/textual/compare/v0.12.0...v0.12.1
[0.12.0]: https://github.com/Textualize/textual/compare/v0.11.1...v0.12.0
[0.11.1]: https://github.com/Textualize/textual/compare/v0.11.0...v0.11.1
[0.11.0]: https://github.com/Textualize/textual/compare/v0.10.1...v0.11.0
[0.10.1]: https://github.com/Textualize/textual/compare/v0.10.0...v0.10.1
[0.10.0]: https://github.com/Textualize/textual/compare/v0.9.1...v0.10.0
[0.9.1]: https://github.com/Textualize/textual/compare/v0.9.0...v0.9.1
[0.9.0]: https://github.com/Textualize/textual/compare/v0.8.2...v0.9.0
[0.8.2]: https://github.com/Textualize/textual/compare/v0.8.1...v0.8.2
[0.8.1]: https://github.com/Textualize/textual/compare/v0.8.0...v0.8.1
[0.8.0]: https://github.com/Textualize/textual/compare/v0.7.0...v0.8.0
[0.7.0]: https://github.com/Textualize/textual/compare/v0.6.0...v0.7.0
[0.6.0]: https://github.com/Textualize/textual/compare/v0.5.0...v0.6.0
[0.5.0]: https://github.com/Textualize/textual/compare/v0.4.0...v0.5.0
[0.4.0]: https://github.com/Textualize/textual/compare/v0.3.0...v0.4.0
[0.3.0]: https://github.com/Textualize/textual/compare/v0.2.1...v0.3.0
[0.2.1]: https://github.com/Textualize/textual/compare/v0.2.0...v0.2.1
[0.2.0]: https://github.com/Textualize/textual/compare/v0.1.18...v0.2.0
[0.1.18]: https://github.com/Textualize/textual/compare/v0.1.17...v0.1.18
[0.1.17]: https://github.com/Textualize/textual/compare/v0.1.16...v0.1.17
[0.1.16]: https://github.com/Textualize/textual/compare/v0.1.15...v0.1.16
[0.1.15]: https://github.com/Textualize/textual/compare/v0.1.14...v0.1.15
[0.1.14]: https://github.com/Textualize/textual/compare/v0.1.13...v0.1.14
[0.1.13]: https://github.com/Textualize/textual/compare/v0.1.12...v0.1.13
[0.1.12]: https://github.com/Textualize/textual/compare/v0.1.11...v0.1.12
[0.1.11]: https://github.com/Textualize/textual/compare/v0.1.10...v0.1.11
[0.1.10]: https://github.com/Textualize/textual/compare/v0.1.9...v0.1.10
[0.1.9]: https://github.com/Textualize/textual/compare/v0.1.8...v0.1.9
[0.1.8]: https://github.com/Textualize/textual/compare/v0.1.7...v0.1.8
[0.1.7]: https://github.com/Textualize/textual/releases/tag/v0.1.7
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