content: /*
   * Copyright 2014 Toxic Bakery
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *       http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.msky.viewpageranimation.animationlibrary;
  
  import android.view.View;
  
  public class ZoomOutSlideTransformer extends ABaseTransformer {
  
  	private static final float MIN_SCALE = 0.85f;
  	private static final float MIN_ALPHA = 0.5f;
  
  	@Override
  	protected void onTransform(View view, float position) {
  		if (position >= -1 || position <= 1) {
  			// Modify the default slide transition to shrink the page as well
  			final float height = view.getHeight();
  			final float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));
  			final float vertMargin = height * (1 - scaleFactor) / 2;
  			final float horzMargin = view.getWidth() * (1 - scaleFactor) / 2;
  
  			// Center vertically
  			view.setPivotY(0.5f * height);
  
  			if (position < 0) {
  				view.setTranslationX(horzMargin - vertMargin / 2);
  			} else {
  				view.setTranslationX(-horzMargin + vertMargin / 2);
  			}
  
  			// Scale the page down (between MIN_SCALE and 1)
  			view.setScaleX(scaleFactor);
  			view.setScaleY(scaleFactor);
  
  			// Fade the page relative to its size.
  			view.setAlpha(MIN_ALPHA + (scaleFactor - MIN_SCALE) / (1 - MIN_SCALE) * (1 - MIN_ALPHA));
  		}
  	}
  
  }
  