packages/MaterialDesignThemes.2.5.1/src/net45/Ripple.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;

namespace MaterialDesignThemes.Wpf
{
    [TemplateVisualState(GroupName = "CommonStates", Name = TemplateStateNormal)]
    [TemplateVisualState(GroupName = "CommonStates", Name = TemplateStateMousePressed)]
    [TemplateVisualState(GroupName = "CommonStates", Name = TemplateStateMouseOut)]
    public class Ripple : ContentControl
    {
        public const string TemplateStateNormal = "Normal";
        public const string TemplateStateMousePressed = "MousePressed";
        public const string TemplateStateMouseOut = "MouseOut";

        private static readonly HashSet<Ripple> PressedInstances = new HashSet<Ripple>();

        static Ripple()
        {                        
            DefaultStyleKeyProperty.OverrideMetadata(typeof(Ripple), new FrameworkPropertyMetadata(typeof(Ripple)));

            EventManager.RegisterClassHandler(typeof(ContentControl), Mouse.PreviewMouseUpEvent, new MouseButtonEventHandler(MouseButtonEventHandler), true);
            EventManager.RegisterClassHandler(typeof(ContentControl), Mouse.MouseMoveEvent, new MouseEventHandler(MouseMoveEventHandler), true);
            EventManager.RegisterClassHandler(typeof(Popup), Mouse.PreviewMouseUpEvent, new MouseButtonEventHandler(MouseButtonEventHandler), true);
            EventManager.RegisterClassHandler(typeof(Popup), Mouse.MouseMoveEvent, new MouseEventHandler(MouseMoveEventHandler), true);
        }

        public Ripple()
        {            
            SizeChanged += OnSizeChanged;            
        }        

        private static void MouseButtonEventHandler(object sender, MouseButtonEventArgs e)
        {
            foreach (var ripple in PressedInstances)
            {
                // adjust the transition scale time according to the current animated scale
                var scaleTrans = ripple.Template.FindName("ScaleTransform", ripple) as ScaleTransform;
                if (scaleTrans != null)
                {
                    double currentScale = scaleTrans.ScaleX;
                    var newTime = TimeSpan.FromMilliseconds(300 * (1.0 - currentScale));

                    // change the scale animation according to the current scale
                    var scaleXKeyFrame = ripple.Template.FindName("MousePressedToNormalScaleXKeyFrame", ripple) as EasingDoubleKeyFrame;
                    if (scaleXKeyFrame != null)
                    {
                        scaleXKeyFrame.KeyTime = KeyTime.FromTimeSpan(newTime);
                    }
                    var scaleYKeyFrame = ripple.Template.FindName("MousePressedToNormalScaleYKeyFrame", ripple) as EasingDoubleKeyFrame;
                    if (scaleYKeyFrame != null) {
                        scaleYKeyFrame.KeyTime = KeyTime.FromTimeSpan(newTime);
                    }
                }