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using System;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Animation;
namespace MaterialDesignThemes.Wpf.Transitions
{
public class SlideWipe : ITransitionWipe
{
private readonly SineEase _sineEase = new SineEase();
/// <summary>
/// Direction of the slide wipe
/// </summary>
public SlideDirection Direction { get; set; }
/// <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(Duration);
// Set up coordinates
double fromStartX = 0, fromEndX = 0, toStartX = 0, toEndX = 0;
double fromStartY = 0, fromEndY = 0, toStartY = 0, toEndY = 0;
if (Direction == SlideDirection.Left)
{
fromEndX = -fromSlide.ActualWidth;
toStartX = toSlide.ActualWidth;
}
else if (Direction == SlideDirection.Right)
{
fromEndX = fromSlide.ActualWidth;
toStartX = -toSlide.ActualWidth;
}
else if (Direction == SlideDirection.Up)
{
fromEndY = -fromSlide.ActualHeight;
toStartY = toSlide.ActualHeight;
}
else if (Direction == SlideDirection.Down)
{
fromEndY = fromSlide.ActualHeight;
toStartY = -toSlide.ActualHeight;
}
// From
var fromTransform = new TranslateTransform(fromStartX, fromStartY);
fromSlide.RenderTransform = fromTransform;
var fromXAnimation = new DoubleAnimationUsingKeyFrames();
fromXAnimation.KeyFrames.Add(new LinearDoubleKeyFrame(fromStartX, zeroKeyTime));
fromXAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(fromEndX, endKeyTime, _sineEase));
var fromYAnimation = new DoubleAnimationUsingKeyFrames();
fromYAnimation.KeyFrames.Add(new LinearDoubleKeyFrame(fromStartY, zeroKeyTime));
fromYAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(fromEndY, endKeyTime, _sineEase));
// To
var toTransform = new TranslateTransform(toStartX, toStartY);
toSlide.RenderTransform = toTransform;
var toXAnimation = new DoubleAnimationUsingKeyFrames();
toXAnimation.KeyFrames.Add(new LinearDoubleKeyFrame(toStartX, zeroKeyTime));
toXAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(toEndX, endKeyTime, _sineEase));
var toYAnimation = new DoubleAnimationUsingKeyFrames();
toYAnimation.KeyFrames.Add(new LinearDoubleKeyFrame(toStartY, zeroKeyTime));
toYAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(toEndY, endKeyTime, _sineEase));
// Set up events
fromXAnimation.Completed += (sender, args) =>
{
fromTransform.BeginAnimation(TranslateTransform.XProperty, null);
fromTransform.X = fromEndX;
fromSlide.RenderTransform = null;
};
fromYAnimation.Completed += (sender, args) =>
{
fromTransform.BeginAnimation(TranslateTransform.YProperty, null);
fromTransform.Y = fromEndY;
fromSlide.RenderTransform = null;
};
toXAnimation.Completed += (sender, args) =>
{
toTransform.BeginAnimation(TranslateTransform.XProperty, null);
toTransform.X = toEndX;
toSlide.RenderTransform = null;
};
toYAnimation.Completed += (sender, args) =>
{
toTransform.BeginAnimation(TranslateTransform.YProperty, null);
toTransform.Y = toEndY;
toSlide.RenderTransform = null;
};
// Animate
fromTransform.BeginAnimation(TranslateTransform.XProperty, fromXAnimation);
fromTransform.BeginAnimation(TranslateTransform.YProperty, fromYAnimation);
toTransform.BeginAnimation(TranslateTransform.XProperty, toXAnimation);
toTransform.BeginAnimation(TranslateTransform.YProperty, toYAnimation);
zIndexController.Stack(toSlide, fromSlide);
}
}
}
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