private void UpdateSubTree(VisualElement root)
{
Rect yogaRect = new Rect(root.yogaNode.LayoutX, root.yogaNode.LayoutY, root.yogaNode.LayoutWidth, root.yogaNode.LayoutHeight);
Rect lastRect = root.renderData.lastLayout;
bool rectChanged = lastRect != yogaRect;
// If the last layout rect is different than the current one we must dirty transform on children
if (rectChanged)
{
if (yogaRect.position != lastRect.position)
{
root.IncrementVersion(VersionChangeType.Transform);
}
root.IncrementVersion(VersionChangeType.Clip);
root.renderData.lastLayout = yogaRect;
}
// ignore clean sub trees
bool hasNewLayout = root.yogaNode.HasNewLayout;
if (hasNewLayout)
{
for (int i = 0; i < root.shadow.childCount; ++i)
{
UpdateSubTree(root.shadow[i]);
}
}
if (rectChanged)
{
using (var evt = GeometryChangedEvent.GetPooled(lastRect, yogaRect))
{
evt.target = root;
root.SendEvent(evt);
}
}
if (hasNewLayout)
{
root.yogaNode.MarkLayoutSeen();
// Layout change require a repaint
root.IncrementVersion(VersionChangeType.Repaint);
}
}
public void Insert(int index, VisualElement child)
{
if (child == null)
{
throw new ArgumentException("Cannot insert null child");
}
if (index > childCount)
{
throw new IndexOutOfRangeException("Index out of range: " + index);
}
if (child == m_Owner)
{
throw new ArgumentException("Cannot insert element as its own child");
}
child.RemoveFromHierarchy();
child.shadow.SetParent(m_Owner);
if (m_Owner.m_Children == null)
{
//TODO: Trigger a release on finalizer or something, this means we'll need to make the pool thread-safe as well
m_Owner.m_Children = VisualElementListPool.Get();
}
if (m_Owner.yogaNode.IsMeasureDefined)
{
m_Owner.yogaNode.SetMeasureFunction(null);
}
PutChildAtIndex(child, index);
child.SetEnabledFromHierarchy(m_Owner.enabledInHierarchy);
child.IncrementVersion(VersionChangeType.Hierarchy);
m_Owner.IncrementVersion(VersionChangeType.Hierarchy);
}