| /* |
| * Copyright 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 androidx.recyclerview.selection; |
| |
| import static androidx.core.util.Preconditions.checkArgument; |
| |
| import android.view.GestureDetector.OnDoubleTapListener; |
| import android.view.GestureDetector.OnGestureListener; |
| import android.view.GestureDetector.SimpleOnGestureListener; |
| import android.view.MotionEvent; |
| |
| import androidx.annotation.NonNull; |
| import androidx.annotation.Nullable; |
| |
| /** |
| * GestureRouter is responsible for routing gestures detected by a GestureDetector |
| * to registered handlers. The primary function is to divide events by tool-type |
| * allowing handlers to cleanly implement tool-type specific policies. |
| * |
| * @param <T> listener type. Must extend OnGestureListener & OnDoubleTapListener. |
| */ |
| final class GestureRouter<T extends OnGestureListener & OnDoubleTapListener> |
| implements OnGestureListener, OnDoubleTapListener { |
| |
| private final ToolHandlerRegistry<T> mDelegates; |
| |
| GestureRouter(@NonNull T defaultDelegate) { |
| checkArgument(defaultDelegate != null); |
| mDelegates = new ToolHandlerRegistry<>(defaultDelegate); |
| } |
| |
| @SuppressWarnings("unchecked") |
| GestureRouter() { |
| this((T) new SimpleOnGestureListener()); |
| } |
| |
| /** |
| * @param toolType |
| * @param delegate the delegate, or null to unregister. |
| */ |
| public void register(int toolType, @Nullable T delegate) { |
| mDelegates.set(toolType, delegate); |
| } |
| |
| @Override |
| public boolean onSingleTapConfirmed(@NonNull MotionEvent e) { |
| return mDelegates.get(e).onSingleTapConfirmed(e); |
| } |
| |
| @Override |
| public boolean onDoubleTap(@NonNull MotionEvent e) { |
| return mDelegates.get(e).onDoubleTap(e); |
| } |
| |
| @Override |
| public boolean onDoubleTapEvent(@NonNull MotionEvent e) { |
| return mDelegates.get(e).onDoubleTapEvent(e); |
| } |
| |
| @Override |
| public boolean onDown(@NonNull MotionEvent e) { |
| return mDelegates.get(e).onDown(e); |
| } |
| |
| @Override |
| public void onShowPress(@NonNull MotionEvent e) { |
| mDelegates.get(e).onShowPress(e); |
| } |
| |
| @Override |
| public boolean onSingleTapUp(@NonNull MotionEvent e) { |
| return mDelegates.get(e).onSingleTapUp(e); |
| } |
| |
| @Override |
| public boolean onScroll(@NonNull MotionEvent e1, @NonNull MotionEvent e2, |
| float distanceX, float distanceY) { |
| return mDelegates.get(e2).onScroll(e1, e2, distanceX, distanceY); |
| } |
| |
| @Override |
| public void onLongPress(@NonNull MotionEvent e) { |
| mDelegates.get(e).onLongPress(e); |
| } |
| |
| @Override |
| public boolean onFling(@NonNull MotionEvent e1, @NonNull MotionEvent e2, |
| float velocityX, float velocityY) { |
| return mDelegates.get(e2).onFling(e1, e2, velocityX, velocityY); |
| } |
| } |