void DispatchMouseEnterMouseLeave(VisualElement previousTopElementUnderMouse, VisualElement currentTopElementUnderMouse, Event triggerEvent)
{
if (previousTopElementUnderMouse == currentTopElementUnderMouse)
{
return;
}
// We want to find the common ancestor CA of previousTopElementUnderMouse and currentTopElementUnderMouse,
// send MouseLeave events to elements between CA and previousTopElementUnderMouse
// and send MouseEnter events to elements between CA and currentTopElementUnderMouse.
int prevDepth = 0;
var p = previousTopElementUnderMouse;
while (p != null)
{
prevDepth++;
p = p.shadow.parent;
}
int currDepth = 0;
var c = currentTopElementUnderMouse;
while (c != null)
{
currDepth++;
c = c.shadow.parent;
}
p = previousTopElementUnderMouse;
c = currentTopElementUnderMouse;
while (prevDepth > currDepth)
{
using (var leaveEvent = MouseLeaveEvent.GetPooled(triggerEvent))
{
leaveEvent.target = p;
DispatchEvent(leaveEvent, p.panel);
}
prevDepth--;
p = p.shadow.parent;
}
// We want to send enter events after all the leave events.
// We will store the elements being entered in this list.
List <VisualElement> enteringElements = new List <VisualElement>(currDepth);
while (currDepth > prevDepth)
{
enteringElements.Add(c);
currDepth--;
c = c.shadow.parent;
}
// Now p and c are at the same depth. Go up the tree until p == c.
while (p != c)
{
using (var leaveEvent = MouseLeaveEvent.GetPooled(triggerEvent))
{
leaveEvent.target = p;
DispatchEvent(leaveEvent, p.panel);
}
enteringElements.Add(c);
p = p.shadow.parent;
c = c.shadow.parent;
}
for (var i = enteringElements.Count - 1; i >= 0; i--)
{
using (var enterEvent = MouseEnterEvent.GetPooled(triggerEvent))
{
enterEvent.target = enteringElements[i];
DispatchEvent(enterEvent, enteringElements[i].panel);
}
}
}
void DispatchMouseEnterMouseLeave(VisualElement previousTopElementUnderMouse, VisualElement currentTopElementUnderMouse, IMouseEvent triggerEvent)
{
DispatchEnterLeave(previousTopElementUnderMouse, currentTopElementUnderMouse, () => MouseEnterEvent.GetPooled(triggerEvent), () => MouseLeaveEvent.GetPooled(triggerEvent));
}
void DispatchMouseEnterMouseLeave(VisualElement previousTopElementUnderMouse, VisualElement currentTopElementUnderMouse, IMouseEvent triggerEvent)
{
if (triggerEvent != null)
{
DispatchEnterLeave(previousTopElementUnderMouse, currentTopElementUnderMouse, () => MouseEnterEvent.GetPooled(triggerEvent), () => MouseLeaveEvent.GetPooled(triggerEvent));
}
else
{
DispatchEnterLeave(previousTopElementUnderMouse, currentTopElementUnderMouse, () => MouseEnterEvent.GetPooled(m_LastMousePosition), () => MouseLeaveEvent.GetPooled(m_LastMousePosition));
}
}