/**
* Helper method which just calls scrollTo() in the correct scrolling direction.
*
* @param value - New Scroll value
*/
@SuppressLint("InlinedApi")
protected final void setHeaderScroll(int value) {
if (DEBUG) {
Log.d(LOG_TAG, "setHeaderScroll: " + value);
}
// Clamp value to with pull scroll range
final int maximumPullScroll = getMaximumPullScroll();
value = Math.min(maximumPullScroll, Math.max(-maximumPullScroll, value));
if (mLayoutVisibilityChangesEnabled) {
if (value < 0) {
mHeaderLayout.setVisibility(View.VISIBLE);
} else if (value > 0) {
mFooterLayout.setVisibility(View.VISIBLE);
} else {
mHeaderLayout.setVisibility(View.INVISIBLE);
mFooterLayout.setVisibility(View.INVISIBLE);
}
}
if (USE_HW_LAYERS) {
/**
* Use a Hardware Layer on the Refreshable View if we've scrolled at all. We don't use them on
* the Header/Footer Views as they change often, which would negate any HW layer performance
* boost.
*/
ViewCompat.setLayerType(
mRefreshableViewWrapper, value != 0 ? View.LAYER_TYPE_HARDWARE : View.LAYER_TYPE_NONE);
}
switch (getPullToRefreshScrollDirection()) {
case VERTICAL:
scrollTo(0, value);
break;
case HORIZONTAL:
scrollTo(value, 0);
break;
}
}
