static void ShowFocusVisual(Control control, FrameworkElement target)
{
HideFocusVisual();
AdornerLayer adornerlayer = AdornerLayer.GetAdornerLayer(target);
if (adornerlayer == null)
{
return;
}
Style fvs = target.FocusVisualStyle;
if (fvs != null && fvs.BasedOn == null && fvs.Setters.Count == 0)
{
fvs = target.TryFindResource(SystemParameters.FocusVisualStyleKey) as Style;
}
if (fvs != null)
{
_focusVisualAdornerCache = new FocusVisualAdorner(control, target, fvs);
adornerlayer.Add(_focusVisualAdornerCache);
// Hide the focus visual when IsVisible changes to avoid an internal WPF exception
control.IsVisibleChanged += OnControlIsVisibleChanged;
}
}
private void OnTargetChanged(object sender, EventArgs e)
{
if (focusVisualAdorner != null)
{
focusVisualAdorner.Dispose();
focusVisualAdorner = null;
}
FrameworkElement focusedElement = (FrameworkElement)presentationSource.KeyboardDevice.Target;
if (focusedElement != null)
{
focusVisualAdorner = FocusVisualAdorner.Attach(focusedElement);
SetNavigationFocusElement(focusedElement);
}
}
private void ShowFocusVisual(DependencyObject element)
{
// Always hide the existing focus visual
HideFocusVisual();
// Disable keyboard cues (accesskey underline) if keyboard device is not MostRecentInputDevice
if (!IsKeyboardMostRecentInputDevice())
{
EnableKeyboardCues(element, false);
}
// Show focus visual if system metric is true or keyboard is used last
if (AlwaysShowFocusVisual || IsKeyboardMostRecentInputDevice())
{
FrameworkElement fe = element as FrameworkElement;
if (fe != null)
{
AdornerLayer adornerlayer = AdornerLayer.GetAdornerLayer(fe);
if (adornerlayer == null)
return;
Style fvs = fe.FocusVisualStyle;
// WORKAROUND: (Bug 1016350) If FocusVisualStyle is the "default" value
// then we load the default FocusVisualStyle from ResourceDictionary.
if (fvs == FrameworkElement.DefaultFocusVisualStyle)
{
fvs = SystemResources.FindResourceInternal(SystemParameters.FocusVisualStyleKey) as Style;
}
if (fvs != null)
{
_focusVisualAdornerCache = new FocusVisualAdorner(fe, fvs);
adornerlayer.Add(_focusVisualAdornerCache);
}
}
else // If not FrameworkElement
{
FrameworkContentElement fce = element as FrameworkContentElement;
if (fce != null)
{
IContentHost parentICH = null;
UIElement parentUIElement = GetParentUIElementFromContentElement(fce, ref parentICH);
if (parentICH != null && parentUIElement != null)
{
AdornerLayer adornerlayer = AdornerLayer.GetAdornerLayer(parentUIElement);
if (adornerlayer != null)
{
Style fvs = fce.FocusVisualStyle;
// WORKAROUND: (Bug 1016350) If FocusVisualStyle is the "default" value
// then we load the default FocusVisualStyle from ResourceDictionary.
if (fvs == FrameworkElement.DefaultFocusVisualStyle)
{
fvs = SystemResources.FindResourceInternal(SystemParameters.FocusVisualStyleKey) as Style;
}
if (fvs != null)
{
_focusVisualAdornerCache = new FocusVisualAdorner(fce, parentUIElement, parentICH, fvs);
adornerlayer.Add(_focusVisualAdornerCache);
}
}
}
}
}
}
}
private void OnTargetChanged(object sender, EventArgs e)
{
if (focusVisualAdorner != null)
{
focusVisualAdorner.Dispose();
focusVisualAdorner = null;
}
FrameworkElement focusedElement = (FrameworkElement)presentationSource.KeyboardDevice.Target;
if (focusedElement != null)
{
focusVisualAdorner = FocusVisualAdorner.Attach(focusedElement);
SetNavigationFocusElement(focusedElement);
}
}