public static void MarqueeAsync(this FrameworkElement element, float seconds = 3f)
{
var sb = new Storyboard();
var unloaded = false;
element.Unloaded += (s, e) => unloaded = true;
CoreDi.TaskManager.Run(async() =>
{
while (element != null && !unloaded)
{
double width;
double innerWidth;
try
{
if (element == null || unloaded)
{
break;
}
width = element.ActualWidth;
innerWidth = ((FrameworkElement)((Border)element).Child).ActualWidth;
}
catch
{
break;
}
Application.Current.Dispatcher.Invoke(() =>
{
sb.AddMarquee(seconds, width, innerWidth);
sb.Begin(element);
element.Visibility = Visibility.Visible;
});
await Task.Delay((int)seconds * 1000);
if (seconds == 0)
{
break;
}
}
});
}
/// <summary>
/// Animates a marquee style element
/// The structure should be:
/// [Border ClipToBounds="True"]
/// [Border local:AnimateMarqueeProperty.Value="True"]
/// [Content HorizontalAlignment="Left"]
/// [/Border]
/// [/Border]
/// </summary>
/// <param name="element">The element to animate</param>
/// <param name="seconds">The time the animation will take</param>
/// <returns></returns>
public static void MarqueeAsync(this FrameworkElement element, float seconds = 3f)
{
// Create the storyboard
var sb = new Storyboard();
// Run until element is unloaded
var unloaded = false;
// Monitor for element unloading
element.Unloaded += (s, e) => unloaded = true;
// Run a loop off the caller thread
Task.Run(async() =>
{
// While the element is still available, recheck the size
// after every loop in case the container was resized
while (element != null && !unloaded)
{
// Create width variables
var width = 0d;
var innerWidth = 0d;
try
{
// Check if element is still loaded
if (element == null || unloaded)
{
break;
}
// Try and get current width
width = element.ActualWidth;
innerWidth = ((element as Border).Child as FrameworkElement).ActualWidth;
}
catch
{
// Any issues then stop animating (presume element destroyed)
break;
}
Application.Current.Dispatcher.Invoke(() =>
{
// Add marquee animation
sb.AddMarquee(seconds, width, innerWidth);
// Start animating
sb.Begin(element);
// Make page visible
element.Visibility = Visibility.Visible;
});
// Wait for it to finish animating
await Task.Delay((int)seconds * 1000);
// If this is from first load or zero seconds of animation, do not repeat
if (seconds == 0)
{
break;
}
}
});
}