public int IndexOf(Visual visual)
{
if (visual == null)
{
throw new ArgumentNullException("visual");
}
return List.IndexOf(visual);
}
public void Insert(int index, Visual visual)
{
if (visual == null)
{
throw new ArgumentNullException("visual");
}
List.Insert(index, visual);
}
public void CopyTo(Visual[] array, int arrayIndex)
{
if (array == null)
{
throw new ArgumentNullException("array");
}
List.CopyTo(array, arrayIndex);
}
public bool Contains(Visual visual)
{
if (visual == null)
{
throw new ArgumentNullException("visual");
}
return List.Contains(visual);
}
public void Add(Visual visual)
{
if (visual == null)
{
throw new ArgumentNullException("visual");
}
List.Add(visual);
}
public bool Remove(Visual visual)
{
if (visual == null)
{
throw new ArgumentNullException("visual");
}
if (List.Contains(visual) == false)
{
return false;
}
List.Remove(visual);
return true;
}
protected void RootChanged(Visual oldRoot, Visual newRoot)
{
PresentationSource oldSource = null;
if (oldRoot == newRoot)
{
return;
}
// Always clear the RootSourceProperty on the old root.
if (oldRoot != null)
{
oldSource = CriticalGetPresentationSourceFromElement(oldRoot, RootSourceProperty);
oldRoot.ClearValue(RootSourceProperty);
}
// Always set the SourceProperty on the new root.
if (newRoot != null)
{
newRoot.SetValue(RootSourceProperty, new SecurityCriticalDataForMultipleGetAndSet <PresentationSource>(this));
}
UIElement oldRootUIElement = oldRoot as UIElement;
UIElement newRootUIElement = newRoot as UIElement;
// The IsVisible property can only be true if root visual is connected to a presentation source.
// For Read-Only force-inherited properties, use a private update method.
if (oldRootUIElement != null)
{
oldRootUIElement.UpdateIsVisibleCache();
}
if (newRootUIElement != null)
{
newRootUIElement.UpdateIsVisibleCache();
}
// Broadcast the Unloaded event starting at the old root visual
if (oldRootUIElement != null)
{
oldRootUIElement.OnPresentationSourceChanged(false);
}
// Broadcast the Loaded event starting at the root visual
if (newRootUIElement != null)
{
newRootUIElement.OnPresentationSourceChanged(true);
}
// To fire PresentationSourceChanged when the RootVisual changes;
// rather than simulate a "parent" pointer change, we just walk the
// collection of all nodes that need the event.
foreach (DependencyObject element in _watchers)
{
// We only need to update those elements that are in the
// same context as this presentation source.
if (element.Dispatcher == Dispatcher)
{
PresentationSource testSource = CriticalGetPresentationSourceFromElement(element, CachedSourceProperty);
// 1) If we are removing the rootvisual, then fire on any node whos old
// PresetationSource was the oldSource.
// 2) If we are attaching a rootvisual then fire on any node whos old
// PresentationSource is null;
if (oldSource == testSource || null == testSource)
{
UpdateSourceOfElement(element, null, null);
}
}
}
}
public static PresentationSource FromVisual(Visual visual)
{
SecurityHelper.DemandUIWindowPermission();
return(CriticalFromVisual(visual));
}
