Struct HoverManager 

pub struct HoverManager { /* private fields */ }

Manages hover state history for all input points

Records hit test results for mouse and touch inputs over multiple frames:

• DragStart detection (requires movement threshold over multiple frames)
• Hover-over event detection
• Multi-touch gesture detection
• Input path analysis

The manager maintains a separate history for each active input point.

Implementations

impl HoverManager

pub fn new() -> Self

Create a new empty HoverManager

pub fn push_hit_test(&mut self, input_id: InputPointId, hit_test: FullHitTest)

Push a new hit test result for a specific input point

The most recent result is always at index 0 for that input point. If the history is full, the oldest frame is dropped.

pub fn remove_input_point(&mut self, input_id: &InputPointId)

Remove an input point’s history (e.g., when touch ends)

pub fn get_current(&self, input_id: &InputPointId) -> Option<&FullHitTest>

Get the most recent hit test result for an input point

Returns None if no hit tests have been recorded for this input point.

pub fn get_current_mouse(&self) -> Option<&FullHitTest>

Get the most recent mouse cursor hit test (convenience method)

pub fn get_frame( &self, input_id: &InputPointId, frames_ago: usize, ) -> Option<&FullHitTest>

Get the hit test result from N frames ago for an input point

Returns None if the requested frame is not in history.

pub fn get_history( &self, input_id: &InputPointId, ) -> Option<&VecDeque<FullHitTest>>

Get the entire hover history for an input point (most recent first)

pub fn get_active_input_points(&self) -> Vec<InputPointId>

Get all currently tracked input points

pub fn frame_count(&self, input_id: &InputPointId) -> usize

Get the number of frames in history for an input point

pub fn clear(&mut self)

Clear all hover history for all input points

pub fn clear_input_point(&mut self, input_id: &InputPointId)

Clear history for a specific input point

pub fn has_sufficient_history_for_gestures( &self, input_id: &InputPointId, ) -> bool

Check if we have enough frames for gesture detection on an input point

DragStart detection requires analyzing movement over multiple frames. This returns true if we have at least 2 frames of history.

pub fn any_has_sufficient_history_for_gestures(&self) -> bool

Check if any input point has enough history for gesture detection

pub fn current_hover_node(&self) -> Option<NodeId>

Get the deepest hovered node from the current mouse hit test.

Returns the NodeId of the most specific (deepest in DOM tree) node that the mouse cursor is currently over, or None if not hovering anything.

pub fn previous_hover_node(&self) -> Option<NodeId>

Get the deepest hovered node from the previous frame’s mouse hit test.

Returns the NodeId from one frame ago, or None if not hovering anything or no previous frame exists.

pub fn remap_node_ids( &mut self, dom_id: DomId, node_id_map: &BTreeMap<NodeId, NodeId>, )

Remap NodeIds in all hover histories after DOM reconciliation.

When the DOM is regenerated, NodeIds can change. This method updates all stored NodeIds in hover histories using the old→new mapping from reconciliation. Nodes not found in the map are removed from hit tests.

Trait Implementations

impl Clone for HoverManager

fn clone(&self) -> HoverManager

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for HoverManager

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

Formats the value using the given formatter.

impl Default for HoverManager

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for HoverManager

fn eq(&self, other: &HoverManager) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for HoverManager