private static void RaiseVisualTreeChangedEvent(
EventHandler <VisualTreeChangeEventArgs> visualTreeChanged,
VisualTreeChangeEventArgs args,
bool isPotentialOuterChange)
{
bool savedIsVisualTreeChangedInProgress = s_IsVisualTreeChangedInProgress;
HwndSource savedActiveHwndSource = s_ActiveHwndSource;
try
{
s_IsVisualTreeChangedInProgress = true;
if (isPotentialOuterChange)
{
s_ActiveHwndSource = PresentationSource.FromDependencyObject(args.Parent) as System.Windows.Interop.HwndSource;
}
visualTreeChanged(null, args);
}
finally
{
s_IsVisualTreeChangedInProgress = savedIsVisualTreeChangedInProgress;
s_ActiveHwndSource = savedActiveHwndSource;
}
}
internal static void OnVisualChildChanged(DependencyObject parent, DependencyObject child, bool isAdded)
{
EventHandler<VisualTreeChangeEventArgs> visualTreeChanged = VisualDiagnostics.s_visualTreeChanged;
if (visualTreeChanged != null && VisualDiagnostics.IsVisualTreeChangeEnabled)
{
int index;
VisualTreeChangeType changeType;
if (isAdded)
{
index = VisualDiagnostics.GetChildIndex(parent, child);
changeType = VisualTreeChangeType.Add;
}
else
{
// We cannot reliably get correct child index for a removed child. We'll force it to be -1;
index = -1;
changeType = VisualTreeChangeType.Remove;
}
VisualTreeChangeEventArgs args = new VisualTreeChangeEventArgs(parent, child, index, changeType);
visualTreeChanged(null, args);
}
}
internal static void OnVisualChildChanged(DependencyObject parent, DependencyObject child, bool isAdded)
{
EventHandler <VisualTreeChangeEventArgs> visualTreeChanged = VisualDiagnostics.s_visualTreeChanged;
if (visualTreeChanged != null && VisualDiagnostics.IsVisualTreeChangeEnabled)
{
int index;
VisualTreeChangeType changeType;
if (isAdded)
{
index = VisualDiagnostics.GetChildIndex(parent, child);
changeType = VisualTreeChangeType.Add;
}
else
{
// We cannot reliably get correct child index for a removed child. We'll force it to be -1;
index = -1;
changeType = VisualTreeChangeType.Remove;
}
VisualTreeChangeEventArgs args = new VisualTreeChangeEventArgs(parent, child, index, changeType);
visualTreeChanged(null, args);
}
}