content: package com.rsen.github.easyandroidanimations;
  
  import android.animation.Animator;
  import android.animation.AnimatorListenerAdapter;
  import android.animation.AnimatorSet;
  import android.animation.ObjectAnimator;
  import android.animation.TimeInterpolator;
  import android.view.View;
  import android.view.ViewGroup;
  import android.view.animation.AccelerateDecelerateInterpolator;
  import android.widget.FrameLayout;
  
  /**
   * This animation hides the view by scaling its Y property to mimic the
   * "pulling of blinds". On animation end, the view is restored to its original
   * state and is set to <code>View.INVISIBLE</code>.
   * 
   * @author Phu
   * 
   */
  public class BlindAnimation extends Animation {
  
  	TimeInterpolator interpolator;
  	long duration;
  	AnimationListener listener;
  
  	/**
  	 * This animation hides the view by scaling its Y property to mimic the
  	 * "pulling of blinds". On animation end, the view is restored to its
  	 * original state and is set to <code>View.INVISIBLE</code>.
  	 * 
  	 * @param view
  	 *            The view to be animated.
  	 */
  	public BlindAnimation(View view) {
  		this.view = view;
  		interpolator = new AccelerateDecelerateInterpolator();
  		duration = DURATION_LONG;
  		listener = null;
  	}
  
  	@Override
  	public void animate() {
  		final ViewGroup parent = (ViewGroup) view.getParent(), animationLayout = new FrameLayout(view.getContext());
  		final int positionView = parent.indexOfChild(view);
  		animationLayout.setLayoutParams(view.getLayoutParams());
  		parent.removeView(view);
  		animationLayout.addView(view);
  		parent.addView(animationLayout, positionView);
  
  		final float originalScaleY = view.getScaleY();
  		ObjectAnimator scaleY = ObjectAnimator.ofFloat(animationLayout,
  				View.SCALE_Y, 0f), scaleY_child = ObjectAnimator.ofFloat(view,
  				View.SCALE_Y, 2.5f);
  		
  		animationLayout.setPivotX(1f);
  		animationLayout.setPivotY(1f);
  		view.setPivotX(1f);
  		view.setPivotY(1f);
  		
  		AnimatorSet blindAnimationSet = new AnimatorSet();
  		blindAnimationSet.playTogether(scaleY, scaleY_child);
  		blindAnimationSet.setInterpolator(interpolator);
  		blindAnimationSet.setDuration(duration / 2);
  		blindAnimationSet.addListener(new AnimatorListenerAdapter() {
  
  			@Override
  			public void onAnimationEnd(Animator animation) {
  				view.setVisibility(View.INVISIBLE);
  				view.setScaleY(originalScaleY);
  				animationLayout.removeAllViews();
  				parent.removeView(animationLayout);
  				parent.addView(view, positionView);
  				if (getListener() != null) {
  					getListener().onAnimationEnd(BlindAnimation.this);
  				}
  			}
  		});
  		blindAnimationSet.start();
  	}
  
  	/**
  	 * @return The interpolator of the entire animation.
  	 */
  	public TimeInterpolator getInterpolator() {
  		return interpolator;
  	}
  
  	/**
  	 * @param interpolator
  	 *            The interpolator of the entire animation to set.
  	 */
  	public BlindAnimation setInterpolator(TimeInterpolator interpolator) {
  		this.interpolator = interpolator;
  		return this;
  	}
  
  	/**
  	 * @return The duration of the entire animation.
  	 */
  	public long getDuration() {
  		return duration;
  	}
  
  	/**
  	 * @param duration
  	 *            The duration of the entire animation to set.
  	 * @return This object, allowing calls to methods in this class to be
  	 *         chained.
  	 */
  	public BlindAnimation setDuration(long duration) {
  		this.duration = duration;
  		return this;
  	}
  
  	/**
  	 * @return The listener for the end of the animation.
  	 */
  	public AnimationListener getListener() {
  		return listener;
  	}
  
  	/**
  	 * @param listener
  	 *            The listener to set for the end of the animation.
  	 * @return This object, allowing calls to methods in this class to be
  	 *         chained.
  	 */
  	public BlindAnimation setListener(AnimationListener listener) {
  		this.listener = listener;
  		return this;
  	}
  
  }
  