Struct MessageBox 

pub struct MessageBox { /* private fields */ }

A modal alert dialog that displays a severity icon, title, body text, and one or more buttons.

Constructed via severity-named constructors (MessageBox::information, MessageBox::warning, MessageBox::critical, MessageBox::question, MessageBox::plain), configured fluently, and presented with MessageBox::present. See the module documentation for the full guide.

Implementations

impl MessageBox

pub fn information(title: impl Into<LocalizedString>) -> Self

Construct an informational MessageBox (Information severity).

pub fn warning(title: impl Into<LocalizedString>) -> Self

Construct a warning MessageBox (Warning severity).

pub fn critical(title: impl Into<LocalizedString>) -> Self

Construct a critical-error MessageBox (Critical severity). Click-outside dismissal is disabled; use an explicit button or Escape to close.

pub fn question(title: impl Into<LocalizedString>) -> Self

Construct a confirmation / question MessageBox (Question severity).

pub fn plain(title: impl Into<LocalizedString>) -> Self

Construct a plain MessageBox with no severity icon.

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

Primary message line, rendered in typography.body with text_primary. Prefer a short, self-contained sentence — details belong in informative_text.

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

Secondary, explanatory text rendered below the primary text in typography.body with text_secondary. Matches Qt’s setInformativeText.

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

Detailed text hidden behind a “Show details” Accordion — for technical diagnostics (stack traces, error codes). Matches Qt’s setDetailedText.

pub fn buttons(self, preset: MessageBoxButtons) -> Self

Apply a preset button bundle. Implicitly sets default and escape buttons for the preset (both can be overridden via MessageBox::default_button and MessageBox::escape_button).

pub fn add_button(self, button: impl Into<MessageBoxButton>) -> Self

Append a single button. Use to augment a preset (rare) or to build a bespoke button row without going through MessageBoxButtons::Custom.

pub fn default_button(self, which: StandardButton) -> Self

Mark which button activates on Enter and receives initial focus. Must refer to one of the buttons configured via buttons / add_button.

pub fn escape_button(self, which: StandardButton) -> Self

Mark which button activates on Escape (and scrim-click, when allowed). Must refer to one of the configured buttons.

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

Attach a “Don’t show again”-style checkbox below the body. Internally creates a Signal<bool> initialized to false and reports its state in MessageBoxResult::checkbox_checked. For external observation, use MessageBox::show_again_checkbox_state instead.

pub fn show_again_checkbox_state(self, signal: Signal<bool>) -> Self

Like MessageBox::show_again_checkbox, but with a caller-owned Signal<bool> so the checkbox state survives the dialog lifetime (useful for “remember my choice” persistence).

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

Register the result callback, invoked exactly once when a button fires (either by click or by Enter/Escape shortcut).

pub fn present(self, ctx: &mut EventContext<'_>)

Present the MessageBox as a modal on top of ctx’s current tree. Consumes self; callers who need to present multiple dialogs with shared config should build a factory closure.

Trait Implementations

impl Debug for MessageBox

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

Formats the value using the given formatter.

impl Widget for MessageBox

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 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 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 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 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 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).