public void DispatchEvent(EventBase evt, IPanel panel)
{
IPointerEvent pointerEvent = evt as IPointerEvent;
if (pointerEvent == null)
{
return;
}
IEventHandler targetOverride = panel.GetCapturingElement(pointerEvent.pointerId);
if (targetOverride == null)
{
return;
}
// Release pointer capture if capture element is not in a panel.
VisualElement captureVE = targetOverride as VisualElement;
if (evt.eventTypeId != PointerCaptureOutEvent.TypeId() && captureVE != null && captureVE.panel == null)
{
panel.ReleasePointer(pointerEvent.pointerId);
return;
}
if (evt.target != null && evt.target != targetOverride)
{
return;
}
if (evt.eventTypeId != PointerCaptureEvent.TypeId() && evt.eventTypeId != PointerCaptureOutEvent.TypeId())
{
panel.ProcessPointerCapture(pointerEvent.pointerId);
}
// Exclusive processing by capturing element.
evt.dispatch = true;
evt.target = targetOverride;
evt.currentTarget = targetOverride;
evt.propagationPhase = PropagationPhase.AtTarget;
targetOverride.HandleEvent(evt);
// Leave evt.target = originalCaptureElement for ExecuteDefaultAction()
evt.currentTarget = null;
evt.propagationPhase = PropagationPhase.None;
evt.dispatch = false;
evt.stopDispatch = true;
evt.propagateToIMGUI = false;
}
public void DispatchEvent(EventBase evt, IPanel panel)
{
IPointerEvent pointerEvent = evt as IPointerEvent;
if (pointerEvent == null)
{
return;
}
IEventHandler targetOverride = panel.GetCapturingElement(pointerEvent.pointerId);
if (targetOverride == null)
{
return;
}
// Release pointer capture if capture element is not in a panel.
VisualElement captureVE = targetOverride as VisualElement;
if (evt.eventTypeId != PointerCaptureOutEvent.TypeId() && captureVE != null && captureVE.panel == null)
{
panel.ReleasePointer(pointerEvent.pointerId);
return;
}
if (evt.target != null && evt.target != targetOverride)
{
return;
}
// Case 1342115: mouse position is in local panel coordinates; sending event to a target from a different
// panel will lead to a wrong position, so we don't allow it. Note that in general the mouse-down-move-up
// sequence still works properly because the OS captures the mouse on the starting EditorWindow.
if (panel != null && captureVE != null && captureVE.panel != panel)
{
return;
}
if (evt.eventTypeId != PointerCaptureEvent.TypeId() && evt.eventTypeId != PointerCaptureOutEvent.TypeId())
{
panel.ProcessPointerCapture(pointerEvent.pointerId);
}
// Case 1353921: this will enforce PointerEnter/Out events even during pointer capture.
// According to the W3 standard (https://www.w3.org/TR/pointerevents3/#the-pointerout-event), these events
// are *not* supposed to occur, but we have been sending MouseEnter/Out events during mouse capture
// since the early days of UI Toolkit, and users have been relying on it.
if (panel is BaseVisualElementPanel basePanel)
{
bool shouldRecomputeTopElementUnderPointer = (pointerEvent as IPointerEventInternal)?.recomputeTopElementUnderPointer ?? true;
if (shouldRecomputeTopElementUnderPointer)
{
basePanel.RecomputeTopElementUnderPointer(pointerEvent.pointerId, pointerEvent.position, evt);
}
}
// Exclusive processing by capturing element.
evt.dispatch = true;
evt.target = targetOverride;
evt.currentTarget = targetOverride;
evt.propagationPhase = PropagationPhase.AtTarget;
evt.skipDisabledElements = false;
targetOverride.HandleEvent(evt);
// Leave evt.target = originalCaptureElement for ExecuteDefaultAction()
evt.currentTarget = null;
evt.propagationPhase = PropagationPhase.None;
evt.dispatch = false;
evt.stopDispatch = true;
evt.propagateToIMGUI = false;
}