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* Add Widget.border_title and border_subtitle. Related issues: #1864 * Test setting border_(sub)title. * Add border (sub)title references to StylesCache. These internal references will make it easier for the instance of 'StylesCache' to know which border (sub)title to use, if/when needed. * Add method to render border label. * Add styles to align border (sub)title. * Render border labels. * Update styles template. * Make new 'render_row' parameters optional. * Add (sub)title border snapshot tests. * Document border (sub)title and styles. * Pass (sub)title directly as arguments. Get rid of the watchers to make data flow easier to follow. Related comment: https://github.com/Textualize/textual/pull/2064/files\#r1137746697 * Tweak example. * Fix render_border_label. This was wrong because border labels can be composed of multiple segments if they contain multiple styles. Additionally, we want to render a single blank space of padding around the title. * Ensure we get no label when there's no space. * Add tests for border label rendering. * 'render_border_label' now returns iterable of segments. * Add label to render_row. * Fix calling signature in tests. * Add padding to snapshot tests. * Fix changelog. * Update snapshot tests. * Update snapshot tests. * Border labels expand if there's no corners. * Update CHANGELOG.md * Fix docs. * Remove irrelevant line. * Fix snapshot tests. * Don't share Console among tests. * Simplify example in styles guide. * Avoid expensive function call when possible. * rewording * positive branch first * remove wasteful indirection * fix changelog --------- Co-authored-by: Will McGugan <willmcgugan@gmail.com>
77 lines
2.5 KiB
Markdown
77 lines
2.5 KiB
Markdown
# Tabs
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Displays a number of tab headers which may be activated with a click or navigated with cursor keys.
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- [x] Focusable
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- [ ] Container
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Construct a `Tabs` widget with strings or [Text][rich.text.Text] objects as positional arguments, which will set the labels in the tabs. Here's an example with three tabs:
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```python
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def compose(self) -> ComposeResult:
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yield Tabs("First tab", "Second tab", Text.from_markup("[u]Third[/u] tab"))
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```
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This will create [Tab][textual.widgets.Tab] widgets internally, with auto-incrementing `id` attributes (`"tab-1"`, `"tab-2"` etc).
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You can also supply `Tab` objects directly in the constructor, which will allow you to explicitly set an `id`. Here's an example:
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```python
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def compose(self) -> ComposeResult:
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yield Tabs(
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Tab("First tab", id="one"),
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Tab("Second tab", id="two"),
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)
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```
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When the user switches to a tab by clicking or pressing keys, then `Tabs` will send a [Tabs.TabActivated][textual.widgets.Tabs.TabActivated] message which contains the `tab` that was activated.
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You can then use `event.tab.id` attribute to perform any related actions.
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## Clearing tabs
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Clear tabs by calling the [clear][textual.widgets.Tabs.clear] method. Clearing the tabs will send a [Tabs.TabActivated][textual.widgets.Tabs.TabActivated] message with the `tab` attribute set to `None`.
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## Adding tabs
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Tabs may be added dynamically with the [add_tab][textual.widgets.Tabs.add_tab] method, which accepts strings, [Text][rich.text.Text], or [Tab][textual.widgets.Tab] objects.
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## Example
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The following example adds a `Tabs` widget above a text label. Press ++a++ to add a tab, ++c++ to clear the tabs.
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=== "Output"
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```{.textual path="docs/examples/widgets/tabs.py" press="a,a,a,a,right,right"}
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```
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=== "tabs.py"
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```python
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--8<-- "docs/examples/widgets/tabs.py"
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```
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## Reactive Attributes
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| Name | Type | Default | Description |
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| -------- | ----- | ------- | ---------------------------------------------------------------------------------- |
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| `active` | `str` | `""` | The ID of the active tab. Set this attribute to a tab ID to change the active tab. |
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## Messages
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### ::: textual.widgets.Tabs.TabActivated
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### ::: textual.widgets.Tabs.Cleared
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## Bindings
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The Tabs widget defines the following bindings:
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::: textual.widgets.Tabs.BINDINGS
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options:
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show_root_heading: false
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show_root_toc_entry: false
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## See Also
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- [Tabs](../api/tabs.md) code reference
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