/// <summary>
/// Updates the display of the cue banner based on the control's content, focus and visibility.
/// </summary>
/// <param name="control">The control the cue banner is attached to.</param>
private static void UpdateAdornerState(Control control)
{
if (control != null)
{
CueBannerAdorner adorner = GetCueBannerAdorner(control);
if (adorner != null)
{
if (CueBannerService.HasContent(control) || !control.IsEnabled || control.Visibility != Visibility.Visible)
{
adorner.SetDisplayToHidden();
}
else
{
if (control.IsFocused)
{
adorner.SetDisplayToDim();
}
else
{
adorner.SetDisplayToNormal();
}
}
}
}
}
/// <summary>
/// Gets the cue banner adorner which is applied to the control.
/// </summary>
/// <param name="control">The control the cue banner is attached to.</param>
/// <returns>The cue banner adorner. If the adorner is not found then null is returned.</returns>
private static CueBannerAdorner GetCueBannerAdorner(Control control)
{
CueBannerAdorner cueBannerAdorner = null;
if (control != null)
{
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(control);
if (adornerLayer != null)
{
Adorner[] adorners = adornerLayer.GetAdorners(control);
if (adorners != null)
{
foreach (Adorner adorner in adorners)
{
if (adorner is CueBannerAdorner)
{
cueBannerAdorner = adorner as CueBannerAdorner;
}
}
}
}
}
return(cueBannerAdorner);
}
/// <summary>
/// Event handler that adds the cue banner to the control.
/// </summary>
/// <param name="sender">The object where the event handler is attached.</param>
/// <param name="e">The event data.</param>
private static void Control_Loaded(object sender, RoutedEventArgs e)
{
Control control = sender as Control;
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(control);
CueBannerAdorner cueBannerAdorner = new CueBannerAdorner(control, CueBannerService.GetCueBanner(control));
adornerLayer.Add(cueBannerAdorner);
CueBannerService.UpdateAdornerState(control);
}