| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.android.documentsui.dirlist; |
| |
| import static androidx.core.util.Preconditions.checkState; |
| |
| import androidx.recyclerview.widget.RecyclerView; |
| import androidx.recyclerview.widget.RecyclerView.OnItemTouchListener; |
| import android.view.MotionEvent; |
| |
| import com.android.documentsui.base.BooleanConsumer; |
| import com.android.documentsui.base.Events; |
| |
| /** |
| * Class providing support for gluing gesture scaling of the ui into RecyclerView + DocsUI. |
| */ |
| final class RefreshHelper { |
| |
| private final BooleanConsumer mRefreshLayoutEnabler; |
| |
| private boolean mAttached; |
| |
| public RefreshHelper(BooleanConsumer refreshLayoutEnabler) { |
| mRefreshLayoutEnabler = refreshLayoutEnabler; |
| } |
| |
| private boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) { |
| if (Events.isMouseEvent(e)) { |
| if (Events.isActionDown(e)) { |
| mRefreshLayoutEnabler.accept(false); |
| } |
| } else { |
| // If user has started some gesture while RecyclerView is not at the top, disable |
| // refresh |
| if (Events.isActionDown(e) && rv.computeVerticalScrollOffset() != 0) { |
| mRefreshLayoutEnabler.accept(false); |
| } |
| } |
| |
| if (Events.isActionUp(e)) { |
| mRefreshLayoutEnabler.accept(true); |
| } |
| |
| return false; |
| } |
| |
| private void onTouchEvent(RecyclerView rv, MotionEvent e) { |
| if (Events.isActionUp(e)) { |
| mRefreshLayoutEnabler.accept(true); |
| } |
| } |
| |
| void attach(RecyclerView view) { |
| checkState(!mAttached); |
| |
| view.addOnItemTouchListener( |
| new OnItemTouchListener() { |
| @Override |
| public void onTouchEvent(RecyclerView rv, MotionEvent e) { |
| RefreshHelper.this.onTouchEvent(rv, e); |
| } |
| |
| @Override |
| public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) { |
| return RefreshHelper.this.onInterceptTouchEvent(rv, e); |
| } |
| |
| @Override |
| public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {} |
| }); |
| |
| mAttached = true; |
| } |
| } |