/// <summary>
/// Add a slide and fade in animation to the story board
/// </summary>
/// <param name="page"> The page that needs animation </param>
/// <param name="seconds"> The animation duration </param>
/// <returns></returns>
public static async Task SlideAndFadeInFromRightAsync(
this System.Windows.Controls.Page page,
float seconds)
{
// Create the storyboard
var storyBoard = new Storyboard();
// Add slide from right animation
storyBoard.AddSlideFromRight(seconds, page.WindowWidth);
// Add slide fade In
storyBoard.AddSlideFadeIn(seconds);
storyBoard.Begin(page);
// storyboard开始，以为这动画开始，那么我们将 page 显示出来
page.Visibility = Visibility.Visible;
// 等待动画结束，此时，该page的线程出于stop的状态，任何操作都不允许。
await Task.Delay((int)(seconds * 1000));
}
/// <summary>
/// Add a slide and fade in animation to the story board
/// </summary>
/// <param name="element"> The element that needs animation </param>
/// <param name="seconds"> The animation duration </param>
/// <param name="keepMargin">
/// Whether to keep the element at the same width during
/// animation
/// </param>
/// <param name="width">
/// The animation width to animate to. If not specified the
/// elements width is used
/// </param>
/// <returns></returns>
public static async Task SlideAndFadeInFromLeftAsync(
this FrameworkElement element,
float seconds = 0.3f,
bool keepMargin = true,
int width = 0)
{
// Create the storyboard
var storyBoard = new Storyboard();
// Add slide from right animation
storyBoard.AddSlideFromLeft(seconds, width == 0 ? element.ActualWidth : width,
keepMargin: keepMargin);
// Add slide fade In
storyBoard.AddSlideFadeIn(seconds);
storyBoard.Begin(element);
// storyboard开始，以为这动画开始，那么我们将 element 显示出来
element.Visibility = Visibility.Visible;
// 等待动画结束，此时，该page的线程出于stop的状态，任何操作都不允许。
await Task.Delay((int)(seconds * 1000));
}