the library is a tabLayout, can show scale when horizontal scroll Viewpager, can show scale scale when vertical scroll NestedScrollingChild when this in AppBarLayout
see demo
if you need scale tabLayout tab in vertical scroll, you must get appbarLayout max offset, eg:
@Override
public void onOffsetChanged(AppBarLayout appBarLayout, int offset) {
// in xml set max offset is 15dp(xhdpi 45px), and tabLayout max scale is getZoomMax=0.4
// so zoom / offset = 0.4 / 45px
float zoom = Math.abs(offset) * tabLayout.getZoomMax() / dip2px(MainActivity.this, 15);
tabLayout.updateSelectTabScale(zoom); // control the tab scale
}
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