Struct TextWidget 

pub struct TextWidget { /* private fields */ }

Implementations

impl TextWidget

pub fn new(text: impl Into<LocalizedString>) -> Self

Construct a text widget whose content is a LocalizedString. The text may come from tr!(...) (reactive, re-resolves on locale change) or from lit!("…") for genuinely non-translated strings.

pub fn color(self, color: impl Into<ColorProp>) -> Self

Set the text color. Accepts any impl Into<ColorProp>:

• A raw Color — a frozen literal.
• A [TextRole] — resolved against the theme at paint time (reactive across theme switches).
• A Signal<Color> — reactive state (typically interaction-driven).

The default role is [TextRole::Primary], so .color(...) is only needed when a label wants a non-default theme role (Secondary, Error, Accent, …) or a custom color.

pub fn style(self, style: impl Into<TextStyleProp>) -> Self

Set the text style. Accepts a raw TextStyle, a TextStyleRole, or any value implementing Into<TextStyleProp>. Using a role resolves at paint/layout time, so theme typography changes take effect without a rebuild.

pub fn overflow(self, overflow: TextOverflow) -> Self

Set how the widget handles text that doesn’t fit in the proposed width. Default is [TextOverflow::Wrap].

pub fn single_line(self) -> Self

Shorthand for .overflow(TextOverflow::Ellipsis(EllipsisMode::Trailing)). Use this on labels inside single-line containers (buttons, menu items, tab headers, badges, status bar cells, etc.) so long text truncates with a trailing “…” instead of wrapping onto multiple lines.

pub fn min_shrink_width(self, min: f32) -> Self

Override the compression floor for single-line / ellipsis text — the narrowest width an over-constrained stack may shrink this label to before truncating stops. Defaults to the ellipsis-glyph width.

pub fn no_shrink(self) -> Self

Opt this label out of native shrink: it reports a rigid size and overflows (rather than truncating) when its stack is over-constrained.

pub fn max_lines(self, n: usize) -> Self

Cap the paragraph at n lines when wrapping. Only meaningful in [TextOverflow::Wrap] mode — ignored for ellipsis modes. Lines beyond the cap are silently dropped.

pub fn text_backend(self, backend: Rc<RefCell<dyn TextBackend>>) -> Self

Override the text backend used for measurement and rasterization. In normal app code the framework provides the backend automatically; this method is used by headless tests that inject a MockTextBackend.

pub fn text(self, state: impl Into<Prop<String>>) -> Self

Set the text content. Accepts a static String/&str or a reactive Signal<String> / Prop<String> (resolved and re-rendered on change).

pub fn resolved_text(&self) -> String

Get the current text value (resolves from state if bound).

pub fn markup(self, enabled: bool) -> Self

Enable inline markup parsing. When enabled, the text is parsed as a minimal markdown subset:

• [label](url) — inline link
• *italic* — italic run
• **bold** — bold run

Links are dispatched via on_link_click and colored using theme.colors.text_link.

pub fn on_link_click<F>(self, handler: F) -> Self

where F: Fn(&str, &mut EventContext<'_>) + 'static,

Called when an inline link is tapped. Enables markup automatically.

pub fn on_link_hover<F>(self, handler: F) -> Self

where F: Fn(&str, bool, Rect, &mut EventContext<'_>) + 'static,

Called when an inline link is hovered (enter/leave). Receives the URL, a bool indicating whether the pointer entered (true) or left (false), and the widget-local rect of the link span (so anchoring popups next to the link is cheap). Enables markup automatically.

pub fn a11y_hidden(self) -> Self

Hide this text from the accessibility tree. Use this when the TextWidget is a visual label fragment inside another control that already owns its accessible name via set_name — otherwise screen readers announce the same string twice (once for the control, once for the embedded Label node).

Standalone body text (dialog descriptions, form instructions, read-only display values) should NOT set this — it stays as a Role::Label node.

Trait Implementations

impl Debug for TextWidget

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Widget for TextWidget

fn build(&mut self, ctx: &mut BuildContext<'_>) -> Vec<WidgetId>

Compose child widgets. Called once after the widget is placed in the arena, and again on environment change (theme switch, locale switch). Takes &mut self — store child IDs, signal handles, any state needed later. Returns the list of root child IDs (empty for leaf widgets).

fn layout_response( &self, proposal: SizeProposal, ctx: &LayoutContext<'_>, ) -> LayoutResponse

Respond to the parent’s size proposal with this widget’s wanted size, grow/shrink weights, and compression floor (see [LayoutResponse]).

fn paint(&self, bounds: Rect, canvas: &mut Canvas, ctx: &PaintContext<'_>)

Draw the widget’s visual representation.

fn accessibility(&self, builder: &mut AccessNodeBuilder)

Declare this widget’s accessibility identity.

fn type_name(&self) -> &'static str

Concrete type name of this widget (e.g. "teksilo_widgets::button::Button"). The default implementation resolves at the impl site via std::any::type_name::<Self>(), so calls through &dyn Widget correctly dispatch to the monomorphized fn for the concrete type — getting the concrete name through the vtable without per-impl boilerplate.

fn cacheable_layout(&self) -> bool

Whether this widget’s layout_response may be memoized by the per-pass layout cache. Defaults to true.

fn place_children( &self, _bounds: Rect, _proposal: SizeProposal, _children: &mut [WidgetPlacement], _ctx: &LayoutContext<'_>, )

Position children within the allocated bounds.

fn wants_after_paint(&self) -> bool

Whether this widget wants its after_paint hook to fire each frame. Returning false (the default) saves a virtual call per widget per frame for the vast majority of widgets that don’t aggregate descendant geometry.

fn after_paint(&self, _view: &WidgetTreeView<'_>, _ctx: &PaintContext<'_>)

Called once per frame after this widget’s subtree has finished painting. Receives a read-only view of the layout-resolved arena so a parent can read its descendants’ final bounds — e.g. TitleBar aggregates its drag region and control-button rects into a single HitRegions payload for the Windows backend’s WM_NCHITTEST.

fn wants_post_paint(&self) -> bool

Whether this widget wants its post_paint hook to fire each frame. Returning false (the default) saves a virtual call per widget per frame for the vast majority of widgets that don’t draw a foreground over their children.

fn post_paint( &self, _bounds: Rect, _canvas: &mut Canvas, _ctx: &PaintContext<'_>, )

Draw a foreground layer over this widget’s children.

fn wants_descendant_redirects(&self) -> bool

Whether this widget wants the AT walker to consult its a11y_redirect_descendant hook for every descendant during AT tree emission, not just its direct arena children.

fn a11y_redirect_descendant( &self, _self_id: WidgetId, _descendant: WidgetId, ) -> Option<NodeId>

Optional redirection hook for AT-tree placement of a child.

fn accessible_title_hint(&self) -> Option<String>

Suggest an accessible title to an enclosing container that wraps this widget as content — typically a modal / dialog shell that wants to propagate the inner content’s visible title as the shell’s own accessible name.

fn initial_focus_hint(&self) -> Option<WidgetId>

Optional hint that directs initial focus to a specific descendant when this widget is the root of a deferred-built modal surface.

fn children(&self) -> Vec<WidgetId>

Return the child widget IDs that this widget manages.

fn accessibility_children(&self) -> Option<Vec<WidgetId>>

Optional override for the child ORDER presented to assistive technology, when it must differ from the paint / z-order child order returned by children.

fn as_any(&self) -> Option<&(dyn Any + 'static)>

Downcast hook. Default implementation returns None; concrete widgets override with Some(self) when they want to expose their concrete type to test-level introspection or reflection. The trait already bounds on std::any::Any so concrete types satisfy the 'static requirement.

fn as_any_mut(&mut self) -> Option<&mut (dyn Any + 'static)>

Mutable counterpart of as_any. Default returns None; widgets that want to expose mutable state to tests (e.g. so a test can mutate a Scene inside a SceneView post-layout) override with Some(self). Should follow the same opt-in pattern as as_any: only widgets that opt into & introspection should opt into &mut.

fn clips_children(&self) -> bool

Whether this widget clips its children to its bounds.

fn focus_reveal_rect(&self, _bounds: Rect) -> Option<Rect>

The rectangle (in absolute tree coordinates) that best represents this widget when the framework reveals it into an ancestor scroll area on focus gain. Returning None (the default) reveals the widget’s whole bounds — correct for most controls.

fn hit_shape(&self, _local_point: Point, _bounds: Rect) -> bool

Whether the point lies inside this widget’s actual shape, not just its rectangular bounds. Consulted by hit-testing right after the bounds check: returning false for a point that is inside the bounding box makes the widget transparent to the click there, so it falls through to whatever sibling is painted underneath (the same machinery as a fully pass-through node, but shape-aware).

fn preserves_children_on_rebuild(&self) -> bool

How rebuild_single_widget treats this widget’s existing children when re-running its build().

fn tooltip_has_content(&self) -> bool

Whether this widget, used as tooltip content, currently has anything worth showing.

fn declare_shortcuts(&self) -> Vec<Shortcut>

Declare the rebindable keyboard shortcuts this widget exposes, without installing handlers. The framework calls this at arena insertion time (before build()) and at certain lazy boundaries (e.g. Switcher walks declarations on its not-yet-mounted Pending slots), so settings UIs and the ShortcutRegistry see the keystrokes the moment the owning container mounts — even if build() hasn’t run.

fn take_handler_set(&mut self) -> Option<HandlerSet>

Extract attached handler set from a WidgetWithHandlers wrapper. Called during arena insertion to transfer handlers to the WidgetNode. Default: returns None (no attached handlers).