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/*
* Copyright 2020 Google LLC
*
* 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
*
* https://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 me.zhanghai.android.fastscroll;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import androidx.annotation.AttrRes;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.RecyclerView;
public class FixOnItemTouchListenerRecyclerView extends RecyclerView {
@NonNull
private final OnItemTouchDispatcher mOnItemTouchDispatcher = new OnItemTouchDispatcher();
public FixOnItemTouchListenerRecyclerView(@NonNull Context context) {
super(context);
init();
}
public FixOnItemTouchListenerRecyclerView(@NonNull Context context,
@Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public FixOnItemTouchListenerRecyclerView(@NonNull Context context,
@Nullable AttributeSet attrs,
@AttrRes int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
super.addOnItemTouchListener(mOnItemTouchDispatcher);
}
@Override
public void addOnItemTouchListener(@NonNull OnItemTouchListener listener) {
mOnItemTouchDispatcher.addListener(listener);
}
@Override
public void removeOnItemTouchListener(@NonNull OnItemTouchListener listener) {
mOnItemTouchDispatcher.removeListener(listener);
}
private static class OnItemTouchDispatcher implements OnItemTouchListener {
@NonNull
private final List<OnItemTouchListener> mListeners = new ArrayList<>();
@NonNull
private final Set<OnItemTouchListener> mTrackingListeners = new LinkedHashSet<>();
@Nullable
private OnItemTouchListener mInterceptingListener;
public void addListener(@NonNull OnItemTouchListener listener) {
mListeners.add(listener);
}
public void removeListener(@NonNull OnItemTouchListener listener) {
mListeners.remove(listener);
mTrackingListeners.remove(listener);
if (mInterceptingListener == listener) {
mInterceptingListener = null;
}
}
// @see RecyclerView#findInterceptingOnItemTouchListener
@Override
public boolean onInterceptTouchEvent(@NonNull RecyclerView recyclerView,
@NonNull MotionEvent event) {
int action = event.getAction();
for (OnItemTouchListener listener : mListeners) {
boolean intercepted = listener.onInterceptTouchEvent(recyclerView, event);
if (action == MotionEvent.ACTION_CANCEL) {
mTrackingListeners.remove(listener);
continue;
}
if (intercepted) {
mTrackingListeners.remove(listener);
event.setAction(MotionEvent.ACTION_CANCEL);
for (OnItemTouchListener trackingListener : mTrackingListeners) {
trackingListener.onInterceptTouchEvent(recyclerView, event);
}
event.setAction(action);
mTrackingListeners.clear();
mInterceptingListener = listener;
return true;
} else {
mTrackingListeners.add(listener);
}
}
return false;
}
@Override
public void onTouchEvent(@NonNull RecyclerView recyclerView, @NonNull MotionEvent event) {
if (mInterceptingListener == null) {
return;
}
mInterceptingListener.onTouchEvent(recyclerView, event);
int action = event.getAction();
if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
mInterceptingListener = null;
}
}
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
for (OnItemTouchListener listener : mListeners) {
listener.onRequestDisallowInterceptTouchEvent(disallowIntercept);
}
}
}
}