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using System;
using System.Windows;
using System.Windows.Media.Animation;
namespace MaterialDesignThemes.Wpf.Transitions
{
public class FadeWipe : ITransitionWipe
{
private readonly SineEase _sineEase = new SineEase();
/// <summary>
/// Duration of the animation
/// </summary>
public TimeSpan Duration { get; set; } = TimeSpan.FromSeconds(0.5);
public void Wipe(TransitionerSlide fromSlide, TransitionerSlide toSlide, Point origin, IZIndexController zIndexController)
{
if (fromSlide == null) throw new ArgumentNullException(nameof(fromSlide));
if (toSlide == null) throw new ArgumentNullException(nameof(toSlide));
if (zIndexController == null) throw new ArgumentNullException(nameof(zIndexController));
// Set up time points
var zeroKeyTime = KeyTime.FromTimeSpan(TimeSpan.Zero);
var endKeyTime = KeyTime.FromTimeSpan(TimeSpan.FromSeconds(Duration.TotalSeconds/2));
// From
var fromAnimation = new DoubleAnimationUsingKeyFrames();
fromAnimation.KeyFrames.Add(new LinearDoubleKeyFrame(1, zeroKeyTime));
fromAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(0, endKeyTime, _sineEase));
// To
var toAnimation = new DoubleAnimationUsingKeyFrames();
toAnimation.KeyFrames.Add(new LinearDoubleKeyFrame(0, zeroKeyTime));
toAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(1, endKeyTime, _sineEase));
// Preset
fromSlide.Opacity = 1;
toSlide.Opacity = 0;
// Set up events
toAnimation.Completed += (sender, args) =>
{
toSlide.BeginAnimation(UIElement.OpacityProperty, null);
fromSlide.Opacity = 0;
toSlide.Opacity = 1;
};
fromAnimation.Completed += (sender, args) =>
{
fromSlide.BeginAnimation(UIElement.OpacityProperty, null);
fromSlide.Opacity = 0;
toSlide.BeginAnimation(UIElement.OpacityProperty, toAnimation);
};
// Animate
fromSlide.BeginAnimation(UIElement.OpacityProperty, fromAnimation);
zIndexController.Stack(toSlide, fromSlide);
}
}
}
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