// When visibility is changed, set the default focus
void OnVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
{
if (!(bool)e.NewValue)
{
return;
}
var popupControl = VisualHelpers.FindChild <ContentControl>(this, "PopupContentControl");
Dispatcher.BeginInvoke(DispatcherPriority.Render,
new Action(delegate
{
// Verify object really is visible because sometimes it's not once we switch to Render
if (!GetIsPopupVisible(this))
{
return;
}
if (lastFocusControl != null && lastFocusControl.Focusable)
{
lastFocusControl.Focus();
}
else
{
lastFocusControl = VisualHelpers.FindChild <UIElement>(popupControl, "PART_DefaultFocusControl");
// If we can find the part named PART_DefaultFocusControl, set focus to it
if (lastFocusControl != null && lastFocusControl.Focusable)
{
lastFocusControl.Focus();
}
else
{
lastFocusControl = VisualHelpers.FindFirstFocusableChild(popupControl);
// If no DefaultFocusControl found, try and set focus to the first focusable element found in popup
if (lastFocusControl != null)
{
lastFocusControl.Focus();
}
else
{
// Just give the Popup UserControl focus so it can handle keyboard input
popupControl.Focus();
}
}
}
}
)
);
}
// Run storyboard when IsPopupVisible property changes to true
void OnIsPopupVisibleChanged()
{
var isShown = GetIsPopupVisible(this);
if (isShown && !isLoading)
{
var panel = VisualHelpers.FindChild <FrameworkElement>(this, "PopupPanelContent");
if (panel != null)
{
// Run Storyboard
var animation = (Storyboard)panel.FindResource("ShowEditPanelStoryboard");
animation.Begin();
}
}
// When hiding popup, clear the LastFocusControl
if (!isShown)
{
lastFocusControl = null;
}
}