packages/MaterialDesignThemes.2.5.1/src/net45/Transitions/CircleWipe.cs

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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);