/// <summary>Scan all the controls in the sub-VisualTree staring at node "depObj", and disable the appropriate ones
/// A node should be disabled only if it does not satisfy neither of the following two criteria:
/// (1) it is not configured to be enabled in popupView
/// (2) none of its subnode is configured to be enabled in popupView
/// </summary>
/// <param name="depObj">A node in the visual tree</param>
/// <param name="popupView">a PopupView</param>
/// <returns>false if depObj is disabled, yes otherwise</returns>
private bool ScanAndDisableControls(DependencyObject depObj, PopupView popupView)
{
if (depObj == PopupFrame)
{
return(true);
}
FrameworkElement control = depObj as FrameworkElement;
if (control != null)
{
if (popupView != null)
{
if (popupView.IsControlToAllowEnabled(control.Name))
{
return(true);
}
}
}
bool hasChildrenToAllowEnabled = false;
int depObjCount = VisualTreeHelper.GetChildrenCount(depObj);
for (int i = 0; i < depObjCount; i++)
{
if (ScanAndDisableControls(VisualTreeHelper.GetChild(depObj, i), popupView))
{
hasChildrenToAllowEnabled = true;
}
}
if (!hasChildrenToAllowEnabled)
{
if (control != null)
{
if (control is ISupportUserInput)
{
(control as ISupportUserInput).AllowUserInput = false;
}
else if (control is Canvas)
{
control.IsEnabled = false;
}
}
return(false);
}
return(true);
}
