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Merge "Switch to smooth scrolling when zooming to home/end."

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This commit is contained in:
Ben Kwa
2016-01-06 21:44:43 +00:00
committed by Android (Google) Code Review
parent cd90a54e12 8d7bf9487b
commit 4788b3392c
1 changed files with 17 additions and 6 deletions
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23
packages/DocumentsUI/src/com/android/documentsui/dirlist/MultiSelectManager.java
View File

@@ -945,16 +945,27 @@ public final class MultiSelectManager implements View.OnKeyListener {
if (vh != null) {
vh.itemView.requestFocus();
} else {
// Don't smooth scroll; that taxes the system unnecessarily and makes the scroll
// handling logic below more complicated. See b/24865658.
mView.scrollToPosition(pos);
mView.smoothScrollToPosition(pos);
// Set a one-time listener to request focus when the scroll has completed.
mView.addOnScrollListener(
new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView view, int dx, int dy) {
view.findViewHolderForAdapterPosition(pos).itemView.requestFocus();
view.removeOnScrollListener(this);
public void onScrollStateChanged (RecyclerView view, int newState) {
if (newState == RecyclerView.SCROLL_STATE_IDLE) {
// When scrolling stops, find the item and focus it.
RecyclerView.ViewHolder vh =
view.findViewHolderForAdapterPosition(pos);
if (vh != null) {
vh.itemView.requestFocus();
} else {
// This might happen in weird corner cases, e.g. if the user is
// scrolling while a delete operation is in progress. In that
// case, just don't attempt to focus the missing item.
Log.w(
TAG, "Unable to focus position " + pos + " after a scroll");
}
view.removeOnScrollListener(this);
}
}
});
}