| package com.savoirfairelinux.sflphone.client; |
| |
| import android.view.View; |
| import android.support.v4.view.ViewPager; |
| |
| public class ZoomOutPageTransformer implements ViewPager.PageTransformer { |
| private static float MIN_SCALE = 0.85f; |
| private static 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 vertMargin = pageHeight * (1 - scaleFactor) / 2; |
| float horzMargin = pageWidth * (1 - scaleFactor) / 2; |
| 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)); |
| |
| } else { // (1,+Infinity] |
| // This page is way off-screen to the right. |
| view.setAlpha(0); |
| } |
| } |
| } |