Struct WidgetTreeCache 

pub struct WidgetTreeCache { /* private fields */ }

Previous/current frame cache for widget tree nodes.

Layout and interaction are stored in separate generations so pass 1 can read only previous-frame geometry while pass 3 writes the next frame’s geometry and interaction outputs independently.

Implementations

impl WidgetTreeCache

pub fn begin_frame(&mut self)

Clears the in-progress frame cache while preserving the committed frame.

pub fn finish_frame(&mut self)

Publishes the current frame cache as the previous frame for the next run.

pub fn clear(&mut self)

Drops both previous and current cached node data.

pub fn prev_layout(&self, node_id: NodeId) -> Option<&NodeLayout>

Returns the previous frame layout for node_id.

pub fn current_layout(&self, node_id: NodeId) -> Option<&NodeLayout>

Returns the current frame layout for node_id.

pub fn prev_interaction(&self, node_id: NodeId) -> Option<&NodeInteraction>

Returns the previous frame interaction for node_id.

pub fn current_interaction(&self, node_id: NodeId) -> Option<&NodeInteraction>

Returns the current frame interaction for node_id.

pub fn prev_state(&self, node_id: NodeId) -> Option<NodeFrameState>

Returns the previous combined frame state for node_id.

pub fn current_state(&self, node_id: NodeId) -> Option<NodeFrameState>

Returns the current combined frame state for node_id.

pub fn record_layout(&mut self, node_id: NodeId, layout: NodeLayout)

Records the current frame layout for node_id.

pub fn record_interaction( &mut self, node_id: NodeId, interaction: NodeInteraction, )

Records the current frame interaction for node_id.

Trait Implementations

impl Default for WidgetTreeCache

fn default() -> WidgetTreeCache

Returns the “default value” for a type.