public void Clear()
{
if (childCount > 0)
{
// Copy children to a temporary list because removing child elements from
// the panel may trigger modifications (DetachFromPanelEvent callback)
// of the same list while we are in the foreach loop.
var elements = VisualElementListPool.Copy(m_Owner.m_Children);
ReleaseChildList();
m_Owner.yogaNode.Clear();
if (m_Owner.requireMeasureFunction)
{
m_Owner.yogaNode.SetMeasureFunction(m_Owner.Measure);
}
foreach (VisualElement e in elements)
{
e.InvokeHierarchyChanged(HierarchyChangeType.Remove);
e.hierarchy.SetParent(null);
e.m_LogicalParent = null;
m_Owner.elementPanel?.OnVersionChanged(e, VersionChangeType.Hierarchy);
}
VisualElementListPool.Release(elements);
m_Owner.IncrementVersion(VersionChangeType.Hierarchy);
}
}
private void ReleaseChildList()
{
if (!ReferenceEquals(m_Owner.m_Children, s_EmptyList))
{
var children = m_Owner.m_Children;
m_Owner.m_Children = s_EmptyList;
VisualElementListPool.Release(children);
}
}
private void ReleaseChildList()
{
var children = m_Owner.m_Children;
if (children != null)
{
m_Owner.m_Children = null;
VisualElementListPool.Release(children);
}
}
/// <summary>
/// Remove all child elements from this element's contentContainer
/// </summary>
public void Clear()
{
if (childCount > 0)
{
// Copy children to a temporary list because removing child elements from
// the panel may trigger modifications (DetachFromPanelEvent callback)
// of the same list while we are in the foreach loop.
var elements = VisualElementListPool.Copy(m_Owner.m_Children);
ReleaseChildList();
m_Owner.yogaNode.Clear();
m_Owner.AssignMeasureFunction();
foreach (VisualElement e in elements)
{
e.InvokeHierarchyChanged(HierarchyChangeType.Remove);
e.hierarchy.SetParent(null);
e.m_LogicalParent = null;
m_Owner.elementPanel?.OnVersionChanged(e, VersionChangeType.Hierarchy);
}
if (m_Owner.imguiContainerDescendantCount > 0)
{
int totalChange = m_Owner.imguiContainerDescendantCount;
if (m_Owner.isIMGUIContainer)
{
totalChange--;
}
m_Owner.ChangeIMGUIContainerCount(-totalChange);
}
VisualElementListPool.Release(elements);
m_Owner.IncrementVersion(VersionChangeType.Hierarchy);
}
}
internal static void SendEnterLeave <TLeaveEvent, TEnterEvent>(VisualElement previousTopElementUnderMouse, VisualElement currentTopElementUnderMouse, IMouseEvent triggerEvent, Vector2 mousePosition) where TLeaveEvent : MouseEventBase <TLeaveEvent>, new() where TEnterEvent : MouseEventBase <TEnterEvent>, new()
{
if (previousTopElementUnderMouse != null && previousTopElementUnderMouse.panel == null)
{
// If previousTopElementUnderMouse has been removed from panel,
// do as if there is no element under the mouse.
previousTopElementUnderMouse = null;
}
// We want to find the common ancestor CA of previousTopElementUnderMouse and currentTopElementUnderMouse,
// send Leave (MouseLeave or DragLeave) events to elements between CA and previousTopElementUnderMouse
// and send Enter (MouseEnter or DragEnter) events to elements between CA and currentTopElementUnderMouse.
int prevDepth = 0;
var p = previousTopElementUnderMouse;
while (p != null)
{
prevDepth++;
p = p.hierarchy.parent;
}
int currDepth = 0;
var c = currentTopElementUnderMouse;
while (c != null)
{
currDepth++;
c = c.hierarchy.parent;
}
p = previousTopElementUnderMouse;
c = currentTopElementUnderMouse;
while (prevDepth > currDepth)
{
using (var leaveEvent = MouseEventBase <TLeaveEvent> .GetPooled(triggerEvent, mousePosition, false))
{
leaveEvent.target = p;
p.SendEvent(leaveEvent);
}
prevDepth--;
p = p.hierarchy.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 = VisualElementListPool.Get(currDepth);
while (currDepth > prevDepth)
{
enteringElements.Add(c);
currDepth--;
c = c.hierarchy.parent;
}
// Now p and c are at the same depth. Go up the tree until p == c.
while (p != c)
{
using (var leaveEvent = MouseEventBase <TLeaveEvent> .GetPooled(triggerEvent, mousePosition, false))
{
leaveEvent.target = p;
p.SendEvent(leaveEvent);
}
enteringElements.Add(c);
p = p.hierarchy.parent;
c = c.hierarchy.parent;
}
for (var i = enteringElements.Count - 1; i >= 0; i--)
{
using (var enterEvent = MouseEventBase <TEnterEvent> .GetPooled(triggerEvent, mousePosition, false))
{
enterEvent.target = enteringElements[i];
enteringElements[i].SendEvent(enterEvent);
}
}
VisualElementListPool.Release(enteringElements);
}
internal static void SendEnterLeave <TLeaveEvent, TEnterEvent>(VisualElement previousTopElementUnderMouse, VisualElement currentTopElementUnderMouse, IMouseEvent triggerEvent, Vector2 mousePosition) where TLeaveEvent : MouseEventBase <TLeaveEvent>, new() where TEnterEvent : MouseEventBase <TEnterEvent>, new()
{
bool flag = previousTopElementUnderMouse != null && previousTopElementUnderMouse.panel == null;
if (flag)
{
previousTopElementUnderMouse = null;
}
int i = 0;
VisualElement visualElement;
for (visualElement = previousTopElementUnderMouse; visualElement != null; visualElement = visualElement.hierarchy.parent)
{
i++;
}
int j = 0;
VisualElement visualElement2;
for (visualElement2 = currentTopElementUnderMouse; visualElement2 != null; visualElement2 = visualElement2.hierarchy.parent)
{
j++;
}
visualElement = previousTopElementUnderMouse;
visualElement2 = currentTopElementUnderMouse;
while (i > j)
{
using (TLeaveEvent pooled = MouseEventBase <TLeaveEvent> .GetPooled(triggerEvent, mousePosition, false))
{
pooled.target = visualElement;
visualElement.SendEvent(pooled);
}
i--;
visualElement = visualElement.hierarchy.parent;
}
List <VisualElement> list = VisualElementListPool.Get(j);
while (j > i)
{
list.Add(visualElement2);
j--;
visualElement2 = visualElement2.hierarchy.parent;
}
while (visualElement != visualElement2)
{
using (TLeaveEvent pooled2 = MouseEventBase <TLeaveEvent> .GetPooled(triggerEvent, mousePosition, false))
{
pooled2.target = visualElement;
visualElement.SendEvent(pooled2);
}
list.Add(visualElement2);
visualElement = visualElement.hierarchy.parent;
visualElement2 = visualElement2.hierarchy.parent;
}
for (int k = list.Count - 1; k >= 0; k--)
{
using (TEnterEvent pooled3 = MouseEventBase <TEnterEvent> .GetPooled(triggerEvent, mousePosition, false))
{
pooled3.target = list[k];
list[k].SendEvent(pooled3);
}
}
VisualElementListPool.Release(list);
}
/// <undoc/>
public void Dispose()
{
VisualElementListPool.Release(iterationList);
iterationList = null;
}