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/*
* Copyright (C) 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 com.android.dialer.speeddial.draghelper;
import android.support.v7.widget.RecyclerView.ViewHolder;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.view.HapticFeedbackConstants;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewConfiguration;
import com.android.dialer.common.Assert;
/** OnTouchListener for the {@link com.android.dialer.speeddial.FavoritesViewHolder}. */
public class SpeedDialFavoritesViewHolderOnTouchListener implements OnTouchListener {
private final ViewConfiguration configuration;
private final ItemTouchHelper itemTouchHelper;
private final ViewHolder viewHolder;
private final OnTouchFinishCallback onTouchFinishCallback;
private boolean hasPerformedLongClick;
private float startX;
private float startY;
public SpeedDialFavoritesViewHolderOnTouchListener(
ViewConfiguration configuration,
ItemTouchHelper itemTouchHelper,
ViewHolder viewHolder,
OnTouchFinishCallback onTouchFinishCallback) {
this.configuration = configuration;
this.itemTouchHelper = itemTouchHelper;
this.viewHolder = viewHolder;
this.onTouchFinishCallback = onTouchFinishCallback;
}
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
startX = event.getX();
startY = event.getY();
return true;
case MotionEvent.ACTION_MOVE:
// If the user has long clicked the view
if (event.getEventTime() - event.getDownTime() > ViewConfiguration.getLongPressTimeout()) {
// Perform long click if we haven't already
if (!hasPerformedLongClick) {
v.performLongClick();
v.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
hasPerformedLongClick = true;
} else if (moveEventExceedsTouchSlop(event)) {
itemTouchHelper.startDrag(viewHolder);
onTouchFinishCallback.onTouchFinished(true);
}
}
return true;
case MotionEvent.ACTION_UP:
if (event.getEventTime() - event.getDownTime() < ViewConfiguration.getLongPressTimeout()) {
v.performClick();
}
// fallthrough
case MotionEvent.ACTION_CANCEL:
hasPerformedLongClick = false;
onTouchFinishCallback.onTouchFinished(false);
return true;
default:
return false;
}
}
private boolean moveEventExceedsTouchSlop(MotionEvent event) {
Assert.checkArgument(event.getAction() == MotionEvent.ACTION_MOVE);
if (event.getHistorySize() <= 0) {
return false;
}
return Math.abs(startX - event.getX()) > configuration.getScaledTouchSlop()
|| Math.abs(startY - event.getY()) > configuration.getScaledTouchSlop();
}
/** Callback to listen for on touch events ending. */
public interface OnTouchFinishCallback {
/**
* Called when the user stops touching the view.
*
* @see MotionEvent#ACTION_UP
* @see MotionEvent#ACTION_CANCEL
*/
void onTouchFinished(boolean closeContextMenu);
}
}
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