private static void OnIsKeyTipScopeChanged(DependencyObject scopeElement, DependencyPropertyChangedEventArgs e)
{
KeyTipService current = Current;
Current.scopeToElementMap.UpdateScope(scopeElement);
}
private static void OnShowingKeyTipChanged(DependencyObject element, DependencyPropertyChangedEventArgs e)
{
if ((bool)e.NewValue)
{
var uie = (UIElement)element.LogicalHierarchy().FirstOrDefault(x => x is UIElement);
if (uie != null && uie.Visibility != Visibility.Visible)
{
element.ClearValue(ShowingKeyTipProperty);
return;
}
// Raise the ActivatingKeyTip event.
var activatingEventArgs = new ActivatingKeyTipEventArgs();
var inputElement = element as IInputElement;
if (inputElement != null)
{
inputElement.RaiseEvent(activatingEventArgs);
}
// KeyTips could have been dismissed due to one
// of the event handler, hence check again.
KeyTipService current = Current;
if (current.State == KeyTipState.None)
{
element.ClearValue(ShowingKeyTipProperty);
return;
}
if (activatingEventArgs.KeyTipVisibility != Visibility.Visible)
{
element.ClearValue(ShowingKeyTipProperty);
return;
}
// Create the KeyTip and add it as the adorner.
AdornerLayer adornerLayer = null;
var adornedElement = (UIElement)(activatingEventArgs.PlacementTarget ?? element).VisualHierarchy().FirstOrDefault(x => x is UIElement);
if (adornedElement != null)
{
adornerLayer = AdornerLayer.GetAdornerLayer(adornedElement);
if (adornerLayer == null || !adornedElement.IsVisible)
{
element.ClearValue(ShowingKeyTipProperty);
return;
}
}
KeyTipAdorner adorner = new KeyTipAdorner(adornedElement,
activatingEventArgs.PlacementTarget,
activatingEventArgs.KeyTipHorizontalPlacement,
activatingEventArgs.KeyTipVerticalPlacement,
activatingEventArgs.KeyTipHorizontalOffset,
activatingEventArgs.KeyTipVerticalOffset,
activatingEventArgs.Handled ? null : activatingEventArgs.OwnerRibbonGroup);
adorner.KeyTipControl = current.mKeyTipControlRecycler.Get();
adorner.Element = element;
adornerLayer.Add(adorner);
element.SetValue(KeyTipAdornerProperty, adorner);
element.SetValue(KeyTipAdornerHolderProperty, adornedElement);
if (adorner.VisualHierarchy().FirstOrDefault(x => x is ScrollViewer) == null)
{
current.EnqueueAdornerLayerForPlacementProcessing(adornerLayer);
}
// add the element to currentActiveKeyTipElement list.
current._currentActiveKeyTipElements.Add(element);
}
else
{
// Remove keytip from adorner.
KeyTipAdorner adorner = (KeyTipAdorner)element.GetValue(KeyTipAdornerProperty);
if (adorner != null)
{
Current.mKeyTipControlRecycler.Recycle(adorner.KeyTipControl);
adorner.KeyTipControl = null;
}
UIElement adornedElement = (UIElement)element.GetValue(KeyTipAdornerHolderProperty);
if (adornedElement != null && adorner != null)
{
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(adornedElement);
if (adornerLayer != null)
{
adornerLayer.Remove(adorner);
}
}
element.ClearValue(KeyTipAdornerProperty);
element.ClearValue(KeyTipAdornerHolderProperty);
}
}