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using System;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Animation;
namespace MaterialDesignThemes.Wpf.Transitions
{
public class SlideOutWipe : ITransitionWipe
{
private readonly SineEase _sineEase = new SineEase();
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));
var zeroKeyTime = KeyTime.FromTimeSpan(TimeSpan.Zero);
var midishKeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(200));
var endKeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(400));
//back out old slide setup
var scaleTransform = new ScaleTransform(1, 1);
fromSlide.RenderTransform = scaleTransform;
var scaleAnimation = new DoubleAnimationUsingKeyFrames();
scaleAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(1, zeroKeyTime));
scaleAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(.8, endKeyTime));
scaleAnimation.Completed += (sender, args) =>
{
fromSlide.RenderTransform = null;
};
var opacityAnimation = new DoubleAnimationUsingKeyFrames();
opacityAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(1, zeroKeyTime));
opacityAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(0, endKeyTime));
opacityAnimation.Completed += (sender, args) =>
{
fromSlide.BeginAnimation(UIElement.OpacityProperty, null);
fromSlide.Opacity = 0;
};
//slide in new slide setup
var translateTransform = new TranslateTransform(0, toSlide.ActualHeight);
toSlide.RenderTransform = translateTransform;
var slideAnimation = new DoubleAnimationUsingKeyFrames();
slideAnimation.KeyFrames.Add(new LinearDoubleKeyFrame(toSlide.ActualHeight, zeroKeyTime));
slideAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(toSlide.ActualHeight, midishKeyTime) { EasingFunction = _sineEase});
slideAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(0, endKeyTime) { EasingFunction = _sineEase });
//kick off!
translateTransform.BeginAnimation(TranslateTransform.YProperty, slideAnimation);
scaleTransform.BeginAnimation(ScaleTransform.ScaleXProperty, scaleAnimation);
scaleTransform.BeginAnimation(ScaleTransform.ScaleYProperty, scaleAnimation);
fromSlide.BeginAnimation(UIElement.OpacityProperty, opacityAnimation);
zIndexController.Stack(toSlide, fromSlide);
}
}
}
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