Back to project page Swipe-Tabs.
The source code is released under:
MIT License
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package it.bellotti.android.swipetabs.transforms; /*w w w . j av a 2 s. co m*/ import android.support.v4.view.ViewPager; import android.view.View; /** * Created with IntelliJ IDEA. * User: SimoneBellotti * Date: 20/11/2014 * Time: 15.15 */ public class ZoomOutPageTransformer implements ViewPager.PageTransformer { private static final float MIN_SCALE = 0.85f; private static final float MIN_ALPHA = 0.5f; public void transformPage(View view, float position) { int pageWidth = view.getWidth(); int pageHeight = view.getHeight(); if (position < -1) { // [-Infinity,-1) // This page is way off-screen to the left. view.setAlpha(0); } else if (position <= 1) { // [-1,1] // Modify the default slide transition to shrink the page as well float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position)); float verticalMargin = pageHeight * (1 - scaleFactor) / 2; float horizontalMargin = pageWidth * (1 - scaleFactor) / 2; if (position < 0) { view.setTranslationX(horizontalMargin - verticalMargin / 2); } else { view.setTranslationX(-horizontalMargin + verticalMargin / 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)); } else { // (1,+Infinity] // This page is way off-screen to the right. view.setAlpha(0); } } }