Struct HitRegion 

pub struct HitRegion {

    pub id: u64,
    pub rect: Rect,
    pub depth: u32,
    pub on_click: Option<Rc<dyn Fn()>>,
    pub on_scroll: Option<Rc<dyn Fn(Vec2) -> Vec2>>,
    pub focusable: bool,
    pub on_pointer_down: Option<Rc<dyn Fn(PointerEvent)>>,
    pub on_pointer_move: Option<Rc<dyn Fn(PointerEvent)>>,
    pub on_pointer_up: Option<Rc<dyn Fn(PointerEvent)>>,
    pub on_pointer_cancel: Option<Rc<dyn Fn(PointerEvent)>>,
    pub on_pointer_enter: Option<Rc<dyn Fn(PointerEvent)>>,
    pub on_pointer_leave: Option<Rc<dyn Fn(PointerEvent)>>,
    pub z_index: f32,
    pub on_text_change: Option<Rc<dyn Fn(String)>>,
    pub on_text_submit: Option<Rc<dyn Fn(String)>>,
    pub tf_state_key: Option<u64>,
    pub tf_multiline: bool,
    pub on_drag_start: Option<Rc<dyn Fn(DragStart) -> Option<DragPayload>>>,
    pub on_drag_end: Option<Rc<dyn Fn(DragEnd)>>,
    pub on_drag_enter: Option<Rc<dyn Fn(DragOver)>>,
    pub on_drag_over: Option<Rc<dyn Fn(DragOver)>>,
    pub on_drag_leave: Option<Rc<dyn Fn(DragOver)>>,
    pub on_drop: Option<Rc<dyn Fn(DropEvent) -> bool>>,
    pub on_action: Option<Rc<dyn Fn(Action) -> bool>>,
    pub on_key_event: Option<Rc<dyn Fn(KeyEvent) -> bool>>,
    pub on_preview_key_event: Option<Rc<dyn Fn(KeyEvent) -> bool>>,
    pub cursor: Option<CursorIcon>,
    pub focus_group_id: Option<u64>,
}

Fields

id: u64

rect: Rect

depth: u32

Tree depth: 0 = root, higher = deeper child. Used for three-pass pointer dispatch to determine ancestor/descendant ordering.

on_click: Option<Rc<dyn Fn()>>

on_scroll: Option<Rc<dyn Fn(Vec2) -> Vec2>>

focusable: bool

on_pointer_down: Option<Rc<dyn Fn(PointerEvent)>>

on_pointer_move: Option<Rc<dyn Fn(PointerEvent)>>

on_pointer_up: Option<Rc<dyn Fn(PointerEvent)>>

on_pointer_cancel: Option<Rc<dyn Fn(PointerEvent)>>

on_pointer_enter: Option<Rc<dyn Fn(PointerEvent)>>

on_pointer_leave: Option<Rc<dyn Fn(PointerEvent)>>

z_index: f32

on_text_change: Option<Rc<dyn Fn(String)>>

on_text_submit: Option<Rc<dyn Fn(String)>>

tf_state_key: Option<u64>

If this hit region belongs to a TextField, this persistent key is used for looking up platform-managed TextFieldState. Falls back to id if None.

tf_multiline: bool

True if this hit region corresponds to a multiline text input (TextArea).

on_drag_start: Option<Rc<dyn Fn(DragStart) -> Option<DragPayload>>>

on_drag_end: Option<Rc<dyn Fn(DragEnd)>>

on_drag_enter: Option<Rc<dyn Fn(DragOver)>>

on_drag_over: Option<Rc<dyn Fn(DragOver)>>

on_drag_leave: Option<Rc<dyn Fn(DragOver)>>

on_drop: Option<Rc<dyn Fn(DropEvent) -> bool>>

on_action: Option<Rc<dyn Fn(Action) -> bool>>

on_key_event: Option<Rc<dyn Fn(KeyEvent) -> bool>>

Called when a key event is received while this element is focused. Return true to consume the event.

on_preview_key_event: Option<Rc<dyn Fn(KeyEvent) -> bool>>

Called before on_key_event. Return true to consume before normal dispatch.

cursor: Option<CursorIcon>

Cursor hint for desktop/web.

focus_group_id: Option<u64>

If Some(group_id), this hit region belongs to a focus group with the given id. Tab navigation will cycle within the group instead of moving to elements outside it. Set automatically by the layout engine when the element is a descendant of a node with focus_group: true.

Implementations

impl HitRegion

pub fn from_modifier(id: u64, rect: Rect, m: &Modifier) -> Self

Seed a HitRegion with all the modifier’s event handlers + dnd + cursor. Call‑sites should only override the fields that differ (on_click, focusable, etc.) via struct‑update syntax: HitRegion { focusable: true, ..from_modifier(..) }.

Trait Implementations

impl Clone for HitRegion

fn clone(&self) -> HitRegion

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Default for HitRegion

fn default() -> HitRegion

Returns the “default value” for a type.