| /* |
| * Copyright 2018 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 androidx.recyclerview.selection; |
| |
| import static androidx.core.util.Preconditions.checkArgument; |
| |
| import android.view.MotionEvent; |
| |
| import androidx.annotation.Nullable; |
| import androidx.recyclerview.widget.RecyclerView; |
| import androidx.recyclerview.widget.RecyclerView.OnItemTouchListener; |
| |
| /** |
| * OnItemTouchListener that delegates drag events to a drag listener, |
| * else sends event to fallback {@link OnItemTouchListener}. |
| * |
| * <p>See {@link OnDragInitiatedListener} for details on implementing drag and drop. |
| */ |
| final class PointerDragEventInterceptor implements OnItemTouchListener { |
| |
| private final ItemDetailsLookup mEventDetailsLookup; |
| private final OnDragInitiatedListener mDragListener; |
| private @Nullable OnItemTouchListener mDelegate; |
| |
| PointerDragEventInterceptor( |
| ItemDetailsLookup eventDetailsLookup, |
| OnDragInitiatedListener dragListener, |
| @Nullable OnItemTouchListener delegate) { |
| |
| checkArgument(eventDetailsLookup != null); |
| checkArgument(dragListener != null); |
| |
| mEventDetailsLookup = eventDetailsLookup; |
| mDragListener = dragListener; |
| mDelegate = delegate; |
| } |
| |
| @Override |
| public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) { |
| if (MotionEvents.isPointerDragEvent(e) && mEventDetailsLookup.inItemDragRegion(e)) { |
| return mDragListener.onDragInitiated(e); |
| } else if (mDelegate != null) { |
| return mDelegate.onInterceptTouchEvent(rv, e); |
| } |
| return false; |
| } |
| |
| @Override |
| public void onTouchEvent(RecyclerView rv, MotionEvent e) { |
| if (mDelegate != null) { |
| mDelegate.onTouchEvent(rv, e); |
| } |
| } |
| |
| @Override |
| public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) { |
| if (mDelegate != null) { |
| mDelegate.onRequestDisallowInterceptTouchEvent(disallowIntercept); |
| } |
| } |
| } |