Struct SizedContent 

pub struct SizedContent { /* private fields */ }

An element that fills its parent and builds its content once its size is known, in the same frame.

GPUI has no container queries, and NavigationBar::adaptive’s measure and redraw costs a frame at the wrong layout. Building during prepaint avoids both. The parent must give it a definite size: its height never comes from its content.

Trait Implementations

impl Element for SizedContent

type RequestLayoutState = ()

The type of state returned from [Element::request_layout]. A mutable reference to this state is subsequently provided to [Element::prepaint] and [Element::paint].

type PrepaintState = Option<AnyElement>

The type of state returned from [Element::prepaint]. A mutable reference to this state is subsequently provided to [Element::paint].

fn id(&self) -> Option<ElementId>

If this element has a unique identifier, return it here. This is used to track elements across frames, and will cause a GlobalElementId to be passed to the request_layout, prepaint, and paint methods.

fn source_location(&self) -> Option<&'static Location<'static>>

Source location where this element was constructed, used to disambiguate elements in the inspector and navigate to their source code.

fn request_layout( &mut self, _: Option<&GlobalElementId>, _: Option<&InspectorElementId>, window: &mut Window, cx: &mut App, ) -> (LayoutId, ())

Before an element can be painted, we need to know where it’s going to be and how big it is. Use this method to request a layout from Taffy and initialize the element’s state.

fn prepaint( &mut self, _: Option<&GlobalElementId>, _: Option<&InspectorElementId>, bounds: Bounds<Pixels>, _: &mut (), window: &mut Window, cx: &mut App, ) -> Option<AnyElement>

After laying out an element, we need to commit its bounds to the current frame for hitbox purposes. The state argument is the same state that was returned from [Element::request_layout()].

fn paint( &mut self, _: Option<&GlobalElementId>, _: Option<&InspectorElementId>, _: Bounds<Pixels>, _: &mut (), child: &mut Option<AnyElement>, window: &mut Window, cx: &mut App, )

Once layout has been completed, this method will be called to paint the element to the screen. The state argument is the same state that was returned from [Element::request_layout()].

fn a11y_role(&self) -> Option<Role>

Returns the accessible role for this element, if any. Elements that return None are not included in the accessibility tree.

fn write_a11y_info(&self, _node: &mut Node)

Write accessibility properties to the given node. Called only when a11y_role() returns Some.

fn a11y_synthetic_children( &mut self, _prepaint: &mut Self::PrepaintState, _builder: &mut A11ySubtreeBuilder<'_>, )

Add synthetic child nodes to an [Element] that has an [.id()][Element::id] and a [.role()][Element::a11y_role].

fn into_any(self) -> AnyElement

Convert this element into a dynamically-typed [AnyElement].

impl IntoElement for SizedContent

type Element = SizedContent

The specific type of element into which the implementing type is converted. Useful for converting other types into elements automatically, like Strings

fn into_element(self) -> Self

Convert self into a type that implements [Element].

fn into_any_element(self) -> AnyElement

Convert self into a dynamically-typed [AnyElement].