mirror of https://github.com/M66B/FairEmail.git
114 lines
4.0 KiB
Java
114 lines
4.0 KiB
Java
/*
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* Copyright 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package androidx.recyclerview.selection;
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import static androidx.core.util.Preconditions.checkArgument;
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import android.view.GestureDetector;
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import android.view.MotionEvent;
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import androidx.annotation.NonNull;
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import androidx.recyclerview.widget.RecyclerView;
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import androidx.recyclerview.widget.RecyclerView.OnItemTouchListener;
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/**
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* A class responsible for routing MotionEvents to tool-type specific handlers,
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* and if not handled by a handler, on to a {@link GestureDetector} for further
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* processing.
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*
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* <p>
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* TouchEventRouter takes its name from
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* {@link RecyclerView#addOnItemTouchListener(OnItemTouchListener)}. Despite "Touch"
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* being in the name, it receives MotionEvents for all types of tools.
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*/
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final class TouchEventRouter implements OnItemTouchListener {
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private static final String TAG = "TouchEventRouter";
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private final GestureDetector mDetector;
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private final ToolHandlerRegistry<OnItemTouchListener> mDelegates;
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TouchEventRouter(
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@NonNull GestureDetector detector, @NonNull OnItemTouchListener defaultDelegate) {
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checkArgument(detector != null);
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checkArgument(defaultDelegate != null);
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mDetector = detector;
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mDelegates = new ToolHandlerRegistry<>(defaultDelegate);
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}
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TouchEventRouter(@NonNull GestureDetector detector) {
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this(
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detector,
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// Supply a fallback listener does nothing...because the caller
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// didn't supply a fallback.
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new OnItemTouchListener() {
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@Override
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public boolean onInterceptTouchEvent(
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@NonNull RecyclerView unused, @NonNull MotionEvent e) {
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return false;
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}
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@Override
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public void onTouchEvent(
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@NonNull RecyclerView unused, @NonNull MotionEvent e) {
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}
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@Override
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public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
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}
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});
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}
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/**
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* @param toolType See MotionEvent for details on available types.
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* @param delegate An {@link OnItemTouchListener} to receive events
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* of {@code toolType}.
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*/
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void register(int toolType, @NonNull OnItemTouchListener delegate) {
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checkArgument(delegate != null);
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mDelegates.set(toolType, delegate);
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}
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@Override
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public boolean onInterceptTouchEvent(@NonNull RecyclerView rv, @NonNull MotionEvent e) {
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boolean handled = mDelegates.get(e).onInterceptTouchEvent(rv, e);
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// Forward all events to UserInputHandler.
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// This is necessary since UserInputHandler needs to always see the first DOWN event. Or
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// else all future UP events will be tossed.
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handled |= mDetector.onTouchEvent(e);
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return handled;
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}
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@Override
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public void onTouchEvent(@NonNull RecyclerView rv, @NonNull MotionEvent e) {
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mDelegates.get(e).onTouchEvent(rv, e);
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// Note: even though this event is being handled as part of gestures such as drag and band,
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// continue forwarding to the GestureDetector. The detector needs to see the entire cluster
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// of events in order to properly interpret other gestures, such as long press.
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mDetector.onTouchEvent(e);
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}
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@Override
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public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {}
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}
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