Struct ScaleRotateGestureHandler 

#[repr(C)]
pub struct ScaleRotateGestureHandler {
    pub enabled: Property<bool>,
    pub active: Property<bool>,
    pub scale: Property<f32>,
    pub rotation: Property<f32>,
    pub center: Property<LogicalPosition>,
    pub started: Callback<VoidArg>,
    pub updated: Callback<VoidArg>,
    pub ended: Callback<VoidArg>,
    pub cancelled: Callback<VoidArg>,
    pub cached_rendering_data: CachedRenderingData,
}

The implementation of the ScaleRotateGestureHandler element.

Provides an API surface for platform-recognized pinch gesture events. Receives MouseEvent::PinchGesture events via the normal mouse event tree-walk and exposes cumulative scale, center position, and lifecycle callbacks.

Fields

enabled: Property<bool>

active: Property<bool>

scale: Property<f32>

Cumulative scale factor relative to gesture start. Always 1.0 when the gesture starts, then updated as the gesture progresses (e.g., 2.0 means doubled, 0.5 means halved).

rotation: Property<f32>

Cumulative rotation in degrees relative to gesture start. Always 0.0 when the gesture starts.

center: Property<LogicalPosition>

started: Callback<VoidArg>

updated: Callback<VoidArg>

ended: Callback<VoidArg>

cancelled: Callback<VoidArg>

cached_rendering_data: CachedRenderingData

FIXME: remove this

Implementations

impl ScaleRotateGestureHandler

pub const FIELD_OFFSETS: ScaleRotateGestureHandlerFieldsOffsets = ScaleRotateGestureHandlerFieldsOffsets

Return a zero-sized helper whose methods return field offsets.

impl ScaleRotateGestureHandler

pub fn enabled(self: Pin<&Self>) -> bool

pub fn active(self: Pin<&Self>) -> bool

pub fn scale(self: Pin<&Self>) -> f32

pub fn rotation(self: Pin<&Self>) -> f32

pub fn center(self: Pin<&Self>) -> LogicalPosition

Trait Implementations

impl Default for ScaleRotateGestureHandler

fn default() -> ScaleRotateGestureHandler

Returns the “default value” for a type.

impl HasStaticVTable<ItemVTable> for ScaleRotateGestureHandler

fn static_vtable() -> &'static ItemVTable

Safety: must be a valid VTable for Self

impl Item for ScaleRotateGestureHandler

fn init(self: Pin<&Self>, _self_rc: &ItemRc)

This function is called by the run-time after the memory for the item has been allocated and initialized. It will be called before any user specified bindings are set.

fn deinit(self: Pin<&Self>, _window_adapter: &Rc<dyn WindowAdapter>)

fn layout_info( self: Pin<&Self>, _orientation: Orientation, _cross_axis_constraint: Coord, _window_adapter: &Rc<dyn WindowAdapter>, _self_rc: &ItemRc, ) -> LayoutInfo

We would need max/min/preferred size, and all layout info. cross_axis_constraint is the available width when querying vertical layout info, enabling height-for-width (Text word-wrap, Image aspect ratio). Negative values mean unconstrained.

fn input_event_filter_before_children( self: Pin<&Self>, event: &MouseEvent, _window_adapter: &Rc<dyn WindowAdapter>, _self_rc: &ItemRc, _: &mut MouseCursor, ) -> InputEventFilterResult

Event handler for mouse and touch event. This function is called before being called on children. Then, depending on the return value, it is called for the children, and their children, then Self::input_event is called on the children, and finally Self::input_event is called on this item again.

fn input_event( self: Pin<&Self>, event: &MouseEvent, _window_adapter: &Rc<dyn WindowAdapter>, _self_rc: &ItemRc, _: &mut MouseCursor, ) -> InputEventResult

Handle input event for mouse and touch event

fn capture_key_event( self: Pin<&Self>, _: &InternalKeyEvent, _window_adapter: &Rc<dyn WindowAdapter>, _self_rc: &ItemRc, ) -> KeyEventResult

Called on the parents of the focused item, allowing for global shortcuts and similar overrides of the default actions.

fn key_event( self: Pin<&Self>, _event: &InternalKeyEvent, _window_adapter: &Rc<dyn WindowAdapter>, _self_rc: &ItemRc, ) -> KeyEventResult

fn focus_event( self: Pin<&Self>, _: &FocusEvent, _window_adapter: &Rc<dyn WindowAdapter>, _self_rc: &ItemRc, ) -> FocusEventResult

fn render( self: Pin<&Self>, _backend: &mut &'_ mut dyn ItemRenderer, _self_rc: &ItemRc, _size: LogicalSize, ) -> RenderingResult

fn bounding_rect( self: Pin<&Self>, _window_adapter: &Rc<dyn WindowAdapter>, _self_rc: &ItemRc, geometry: LogicalRect, ) -> LogicalRect

Returns the rendering bounding rect for that particular item in the parent’s item coordinate (same coordinate system as the geometry)

fn clips_children(self: Pin<&Self>) -> bool

impl ItemConsts for ScaleRotateGestureHandler

const cached_rendering_data_offset: FieldOffset<Self, CachedRenderingData>

offset in bytes from the *const ItemImpl. usize::MAX means None

impl<'__dummy_lifetime> Unpin for ScaleRotateGestureHandler

where __MustNotImplUnpin<'__dummy_lifetime>: Unpin,