Struct FontPicker 

pub struct FontPicker { /* private fields */ }

A font-family selector built on ComboBox. See the module docs.

Implementations

impl FontPicker

pub fn new(selected: Signal<Option<String>>) -> Self

Create a picker bound to selected (the chosen family name). The list is enumerated from the app’s shared typesetter at build time.

pub fn families( self, families: impl IntoIterator<Item = impl Into<String>>, ) -> Self

Override the family list instead of enumerating from the typesetter. Family names only — spacing is treated as proportional and writing-system coverage is unknown (the writing-system filter shows all). For deterministic filter tests, prefer families_with_meta.

pub fn families_with_meta(self, families: Vec<(String, FontMeta)>) -> Self

Override the family list and its metadata (monospaced + writing systems). Enables headless testing of the spacing / writing-system filters and the script-aware sample without a font backend.

pub fn spacing_filter(self, filter: impl Into<Prop<FontSpacingFilter>>) -> Self

Restrict the list by spacing (monospaced / proportional). Accepts a static value or a Signal for a reactive filter toolbar.

pub fn writing_system(self, ws: impl Into<Prop<Option<WritingSystem>>>) -> Self

Restrict the list to fonts covering a writing system. None shows all. Accepts a static value or a Signal. The first time a non-None value is applied, the coverage index is built off-thread; until it is ready the list is unfiltered.

pub fn preview_mode(self, mode: FontPreviewMode) -> Self

Choose how rows (and the trigger) preview each font. Default FontPreviewMode::NameThenSample.

pub fn preview_in_own_font(self, on: bool) -> Self

Convenience: true keeps the default preview; false switches to FontPreviewMode::NameInSystemFont (UIKit displayUsingSystemFont).

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

Global sample text override (used when the font’s writing system has no more specific sample). Mirrors GTK’s preview text.

pub fn sample_text_for(self, ws: WritingSystem, text: impl Into<String>) -> Self

Per-writing-system sample override (Qt setSampleTextForSystem).

pub fn sample_text_for_family( self, family: impl Into<String>, text: impl Into<String>, ) -> Self

Per-family sample override (Qt setSampleTextForFont) — for fonts whose script the generic sample doesn’t suit (icon fonts, etc.).

pub fn show_selected_in_own_font(self, on: bool) -> Self

Whether the closed trigger renders the selected family in its own typeface (default true; Qt behaviour). No effect in FontPreviewMode::NameInSystemFont.

pub fn placeholder(self, text: impl Into<LocalizedString>) -> Self

Placeholder shown when nothing is selected. Defaults to a localized “Select a font…”.

pub fn label(self, label: impl Into<LocalizedString>) -> Self

Accessible / control label. Defaults to a localized “Font”.

pub fn enabled(self, enabled: impl Into<Prop<bool>>) -> Self

Enable / disable the control, statically or reactively.

pub fn variant(self, variant: ComboBoxVariant) -> Self

Design-language variant, forwarded to the inner ComboBox.

pub fn style(self, style: impl ComboBoxStyle) -> Self

Per-call [ComboBoxStyle] override, forwarded to the inner combo.

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

Maximum rows shown before the dropdown scrolls (default 8).

pub fn searchable(self, on: bool) -> Self

Enable / disable the in-dropdown search field (default true).

pub fn search_query(self, query: Signal<String>) -> Self

Drive the search field from an external query signal (implies searchable).

pub fn on_select( self, f: impl Fn(&str, &mut EventContext<'_>) + 'static, ) -> Self

React to a commit with a live [EventContext] — the place to apply the chosen font (e.g. editor.set_font_family(name)).

pub fn tooltip(self, text: impl Into<LocalizedString>) -> Self

Attach a plain tooltip, forwarded to the inner ComboBox. Mutually exclusive with the rich / composite variants — last-call-wins.

pub fn rich_tooltip(self, key: impl Into<String>) -> Self

Attach a registry-keyed rich tooltip, forwarded to the inner combo.

pub fn rich_tooltip_content(self, content: TooltipContent) -> Self

Attach an inline rich tooltip, forwarded to the inner combo.

pub fn composite_tooltip(self, content: impl Widget + 'static) -> Self

Attach a composite tooltip hosting an arbitrary widget tree, forwarded to the inner combo.

Trait Implementations

impl Debug for FontPicker

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

Formats the value using the given formatter.

impl Widget for FontPicker

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

Position children within the allocated bounds.

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

Return the child widget IDs that this widget manages.

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

Draw the widget’s visual representation.

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 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).