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using System;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Animation;
namespace MaterialDesignThemes.Wpf.Transitions
{
public class CircleWipe : ITransitionWipe
{
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 horizontalProportion = Math.Max(1.0 - origin.X, 1.0 * origin.X);
var verticalProportion = Math.Max(1.0 - origin.Y, 1.0 * origin.Y);
var radius = Math.Sqrt(Math.Pow(toSlide.ActualWidth * horizontalProportion, 2) + Math.Pow(toSlide.ActualHeight * verticalProportion, 2));
var scaleTransform = new ScaleTransform(0, 0);
var translateTransform = new TranslateTransform(toSlide.ActualWidth * origin.X, toSlide.ActualHeight * origin.Y);
var transformGroup = new TransformGroup();
transformGroup.Children.Add(scaleTransform);
transformGroup.Children.Add(translateTransform);
var ellipseGeomotry = new EllipseGeometry()
{
RadiusX = radius,
RadiusY = radius,
Transform = transformGroup
};
toSlide.SetCurrentValue(UIElement.ClipProperty, ellipseGeomotry);
zIndexController.Stack(toSlide, fromSlide);
var zeroKeyTime = KeyTime.FromTimeSpan(TimeSpan.Zero);
var midKeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(200));
var endKeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(400));
var opacityAnimation = new DoubleAnimationUsingKeyFrames();
opacityAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(1, zeroKeyTime));
opacityAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(1, midKeyTime));
opacityAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(0, endKeyTime));
opacityAnimation.Completed += (sender, args) =>
{
fromSlide.BeginAnimation(UIElement.OpacityProperty, null);
fromSlide.Opacity = 0;
};
fromSlide.BeginAnimation(UIElement.OpacityProperty, opacityAnimation);
var scaleAnimation = new DoubleAnimationUsingKeyFrames();
scaleAnimation.Completed += (sender, args) =>
{
toSlide.SetCurrentValue(UIElement.ClipProperty, null);
fromSlide.BeginAnimation(UIElement.OpacityProperty, null);
fromSlide.Opacity = 0;
};
scaleAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(0, zeroKeyTime));
scaleAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(1, endKeyTime));
scaleTransform.BeginAnimation(ScaleTransform.ScaleXProperty, scaleAnimation);
scaleTransform.BeginAnimation(ScaleTransform.ScaleYProperty, scaleAnimation);
}
}
}
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