package org.wikipedia.gallery;
import android.support.v4.view.ViewPager;
import android.view.View;
public class GalleryPagerTransformer implements ViewPager.PageTransformer {
private static final float MIN_SCALE = 0.9f;
@Override
public void transformPage(View view, float position) {
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setTranslationX(0);
} else if (position <= 0) { // [-1,0]
float scaleFactor = MIN_SCALE + (1 - MIN_SCALE) * (1 - Math.abs(position));
view.setScaleX(scaleFactor);
view.setScaleY(scaleFactor);
// fade out
view.setAlpha(1 + position);
// keep it in place (undo the default translation)
view.setTranslationX(-(view.getWidth() * position));
} else if (position <= 1) { // (0,1]
// don't do anything to it when it's sliding in.
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setTranslationX(0);
}
}
}