Struct MouseCursorManager 

pub struct MouseCursorManager {
    pub fallback_mouse_cursor: MouseCursorRef,
    /* private fields */
}

Maintains the state of mouse cursors and manages how cursors are searched for.

This is typically created as a global singleton and owned by MouseTracker.

Fields

fallback_mouse_cursor: MouseCursorRef

The mouse cursor to use if all cursor candidates choose to defer.

See also:

• MouseCursor.defer, the mouse cursor object to use to defer.

Implementations

impl MouseCursorManager

pub fn new(fallback_mouse_cursor: MouseCursorRef) -> MouseCursorManager

Create a MouseCursorManager by specifying the fallback cursor.

The fallback_mouse_cursor must not be MouseCursor.defer.

pub fn debug_device_active_cursor(&self, device: i64) -> Option<MouseCursorRef>

Returns the active mouse cursor of a device.

The return value is the last MouseCursor activated onto this device, even if the activation failed.

This function is only active in debug mode: in release it returns None.

pub fn handle_device_cursor_update( &mut self, platform: &dyn Platform, view: ViewId, device: i64, triggering_event: Option<&PointerEvent>, cursor_candidates: impl IntoIterator<Item = MouseCursorRef>, )

Handles the changes that cause a pointer device to have a new list of mouse cursor candidates.

This change can be caused by a pointer event, in which case triggering_event should not be None, or by other changes, such as when a widget has moved under a still mouse, which is detected after the current frame is complete. In either case, cursor_candidates should be the list of cursors at the location of the mouse in hit-test order.

view is the one the device is on, from its latest event: the cursor is that view’s host’s to show, and the session asks it.