Creating and Reusing Dynamic Animations in Silverlight

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

namespace AgDynAnimations
{
  public partial class EffectsPage : UserControl
  {
    DynamicEffect effect;

    public EffectsPage()
    {
      InitializeComponent();

      fadeInEffect.MouseLeftButtonDown += new MouseButtonEventHandler(fadeInEffect_MouseLeftButtonDown);
      
      fadeOutEffect.MouseLeftButtonDown += new MouseButtonEventHandler(fadeOutEffect_MouseLeftButtonDown);
      fadeOut.Completed += new EventHandler(fadeOut_Completed);

      growEffect.MouseLeftButtonDown += new MouseButtonEventHandler(growEffect_MouseLeftButtonDown);
      grow.Completed += new EventHandler(grow_Completed);

      shrinkEffect.MouseLeftButtonDown += new MouseButtonEventHandler(shrinkEffect_MouseLeftButtonDown);
      shrink.Completed += new EventHandler(shrink_Completed);

      rotateEffect.MouseLeftButtonDown += new MouseButtonEventHandler(rotateEffect_MouseLeftButtonDown);

      expandEffect.MouseLeftButtonDown += new MouseButtonEventHandler(expandEffect_MouseLeftButtonDown);

      collapseEffect.MouseLeftButtonDown += new MouseButtonEventHandler(collapseEffect_MouseLeftButtonDown);
      collapse.Completed += new EventHandler(collapse_Completed);

      dynamicEffect.MouseLeftButtonDown += new MouseButtonEventHandler(dynamicEffect_MouseLeftButtonDown);
    }

    void ResetScale(FrameworkElement target)
    {
      TransformGroup transform = (TransformGroup)target.RenderTransform;
      ScaleTransform scale = (ScaleTransform)transform.Children[0];
      scale.ScaleX = 1.0;
      scale.ScaleY = 1.0;
    }
    void ResetClip(FrameworkElement target)
    {
      PathGeometry path = (PathGeometry)target.Clip;
      PathFigure figure = (PathFigure)path.Figures[0];
      
      LineSegment first = (LineSegment)figure.Segments[0];
      first.Point = new Point(60, 0);

      LineSegment second = (LineSegment)figure.Segments[1];
      second.Point = new Point(60, 50);

      LineSegment third = (LineSegment)figure.Segments[2];
      third.Point = new Point(0, 50);
    }
    void ApplyDynamicEffect()
    {
      if (effect != null)
      {
        effect.Stop();
        effect = null;
      }

      if (chkFadeIn.IsChecked.Value)
        effect = new FadeInEffect();
      else
        effect = new FadeOutEffect();

      effect.Completed += new EventHandler(effect_Completed);
      effect.Start(dynamicEffect);
    }

    void effect_Completed(object sender, EventArgs e)
    {
      effect = null;
      dynamicEffect.Opacity = 1.0;
    }

    void fadeInEffect_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
      fadeIn.Begin();
    }
    void fadeOutEffect_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
      fadeOut.Begin();
    }
    void fadeOut_Completed(object sender, EventArgs e)
    {
      fadeOutEffect.Opacity = 1.0;
    }

    void growEffect_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
      grow.Begin();
    }
    void grow_Completed(object sender, EventArgs e)
    {
      ResetScale(growEffect);
    }

    void shrinkEffect_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
      shrink.Begin();
    }
    void shrink_Completed(object sender, EventArgs e)
    {
      ResetScale(shrinkEffect);
    }

    void rotateEffect_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
      rotate.Begin();
    }

    void expandEffect_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
      expand.Begin();
    }

    void collapseEffect_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
      collapse.Begin();
    }
    void collapse_Completed(object sender, EventArgs e)
    {
      ResetClip(collapseEffect);
    }
    void dynamicEffect_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
      ApplyDynamicEffect();
    }
  }
}