package com.fanxin.huangfangyi.main.widget.custom; import android.support.v4.view.ViewPager; import android.view.View; /** * Created by Mr_immortalZ on 2016/5/2. * email : mr_immortalz@qq.com */ public class ZoomOutPageTransformer implements ViewPager.PageTransformer { private static final float MIN_SCALE = 0.70f; 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(MIN_ALPHA); view.setScaleX(MIN_SCALE); view.setScaleY(MIN_SCALE); } 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 vertMargin = pageHeight * (1 - scaleFactor) / 2; float horzMargin = pageWidth * (1 - scaleFactor) / 2; if (position < 0) { view.setTranslationX(horzMargin - vertMargin / 2); view.setScaleX(1 + 0.3f * position); view.setScaleY(1 + 0.3f * position); } else { view.setTranslationX(-horzMargin + vertMargin / 2); view.setScaleX(1 - 0.3f * position); view.setScaleY(1 - 0.3f * position); } // Scale the page down (between MIN_SCALE and 1) // 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.setScaleX(MIN_SCALE); view.setScaleY(MIN_SCALE); view.setAlpha(MIN_ALPHA); } } }