@Override
public void onScrollChanged(int deltaX, int deltaY) {
// Reposition the header bar -- it's normally anchored to the top of the content,
// but locks to the top of the screen on scroll
int scrollY = mScrollView.getScrollY();
float newTop = Math.max(mPhotoHeightPixels, scrollY);
mHeaderBox.setTranslationY(newTop);
mAddScheduleButtonContainer.setTranslationY(
newTop + mHeaderHeightPixels - mAddScheduleButtonContainerHeightPixels / 2);
float gapFillProgress = 1;
if (mPhotoHeightPixels != 0) {
gapFillProgress =
Math.min(Math.max(UIUtils.getProgress(scrollY, 0, mPhotoHeightPixels), 0), 1);
}
ViewCompat.setElevation(mHeaderBox, gapFillProgress * mMaxHeaderElevation);
ViewCompat.setElevation(
mAddScheduleButtonContainer, gapFillProgress * mMaxHeaderElevation + mFABElevation);
ViewCompat.setElevation(
mAddScheduleButton, gapFillProgress * mMaxHeaderElevation + mFABElevation);
// Move background photo (parallax effect)
mPhotoViewContainer.setTranslationY(scrollY * 0.5f);
}
