private static EventDispatcher.PropagationPaths BuildPropagationPath(VisualElement elem)
{
EventDispatcher.PropagationPaths result;
if (elem == null)
{
result = EventDispatcher.k_EmptyPropagationPaths;
}
else
{
EventDispatcher.PropagationPaths propagationPaths = EventDispatcher.PropagationPathsPool.Acquire();
while (elem.shadow.parent != null)
{
if (elem.shadow.parent.enabledInHierarchy)
{
if (elem.shadow.parent.HasCaptureHandlers())
{
propagationPaths.capturePath.Add(elem.shadow.parent);
}
if (elem.shadow.parent.HasBubbleHandlers())
{
propagationPaths.bubblePath.Add(elem.shadow.parent);
}
}
elem = elem.shadow.parent;
}
result = propagationPaths;
}
return(result);
}
public static EventDispatcher.PropagationPaths Acquire()
{
EventDispatcher.PropagationPaths result;
if (EventDispatcher.PropagationPathsPool.s_Available.Count != 0)
{
EventDispatcher.PropagationPaths propagationPaths = EventDispatcher.PropagationPathsPool.s_Available[0];
EventDispatcher.PropagationPathsPool.s_Available.RemoveAt(0);
result = propagationPaths;
}
else
{
EventDispatcher.PropagationPaths propagationPaths2 = new EventDispatcher.PropagationPaths(16);
result = propagationPaths2;
}
return(result);
}
private static void PropagateEvent(EventBase evt)
{
if (!evt.dispatch)
{
EventDispatcher.PropagationPaths propagationPaths = EventDispatcher.BuildPropagationPath(evt.target as VisualElement);
evt.dispatch = true;
if (evt.capturable && propagationPaths.capturePath.Count > 0)
{
evt.propagationPhase = PropagationPhase.Capture;
for (int i = propagationPaths.capturePath.Count - 1; i >= 0; i--)
{
if (evt.isPropagationStopped)
{
break;
}
evt.currentTarget = propagationPaths.capturePath[i];
evt.currentTarget.HandleEvent(evt);
}
}
if (!evt.isPropagationStopped)
{
evt.propagationPhase = PropagationPhase.AtTarget;
evt.currentTarget = evt.target;
evt.currentTarget.HandleEvent(evt);
}
if (evt.bubbles && propagationPaths.bubblePath.Count > 0)
{
evt.propagationPhase = PropagationPhase.BubbleUp;
for (int j = 0; j < propagationPaths.bubblePath.Count; j++)
{
if (evt.isPropagationStopped)
{
break;
}
evt.currentTarget = propagationPaths.bubblePath[j];
evt.currentTarget.HandleEvent(evt);
}
}
evt.dispatch = false;
evt.propagationPhase = PropagationPhase.None;
evt.currentTarget = null;
}
}
public static void Release(EventDispatcher.PropagationPaths po)
{
po.Clear();
EventDispatcher.PropagationPathsPool.s_Available.Add(po);
}
