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/*
* Copyright (C) 2016 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.app.list;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.view.View;
import java.util.ArrayList;
import java.util.List;
/**
* Class that handles and combines drag events generated from multiple views, and then fires off
* events to any OnDragDropListeners that have registered for callbacks.
*/
public class DragDropController {
private final List<OnDragDropListener> mOnDragDropListeners = new ArrayList<OnDragDropListener>();
private final DragItemContainer mDragItemContainer;
private final int[] mLocationOnScreen = new int[2];
public DragDropController(DragItemContainer dragItemContainer) {
mDragItemContainer = dragItemContainer;
}
/** @return True if the drag is started, false if the drag is cancelled for some reason. */
boolean handleDragStarted(View v, int x, int y) {
int screenX = x;
int screenY = y;
// The coordinates in dragEvent of DragEvent.ACTION_DRAG_STARTED before NYC is window-related.
// This is fixed in NYC.
if (VERSION.SDK_INT >= VERSION_CODES.N) {
v.getLocationOnScreen(mLocationOnScreen);
screenX = x + mLocationOnScreen[0];
screenY = y + mLocationOnScreen[1];
}
final PhoneFavoriteSquareTileView tileView =
mDragItemContainer.getViewForLocation(screenX, screenY);
if (tileView == null) {
return false;
}
for (int i = 0; i < mOnDragDropListeners.size(); i++) {
mOnDragDropListeners.get(i).onDragStarted(screenX, screenY, tileView);
}
return true;
}
public void handleDragHovered(View v, int x, int y) {
v.getLocationOnScreen(mLocationOnScreen);
final int screenX = x + mLocationOnScreen[0];
final int screenY = y + mLocationOnScreen[1];
final PhoneFavoriteSquareTileView view =
mDragItemContainer.getViewForLocation(screenX, screenY);
for (int i = 0; i < mOnDragDropListeners.size(); i++) {
mOnDragDropListeners.get(i).onDragHovered(screenX, screenY, view);
}
}
public void handleDragFinished(int x, int y, boolean isRemoveView) {
if (isRemoveView) {
for (int i = 0; i < mOnDragDropListeners.size(); i++) {
mOnDragDropListeners.get(i).onDroppedOnRemove();
}
}
for (int i = 0; i < mOnDragDropListeners.size(); i++) {
mOnDragDropListeners.get(i).onDragFinished(x, y);
}
}
public void addOnDragDropListener(OnDragDropListener listener) {
if (!mOnDragDropListeners.contains(listener)) {
mOnDragDropListeners.add(listener);
}
}
public void removeOnDragDropListener(OnDragDropListener listener) {
if (mOnDragDropListeners.contains(listener)) {
mOnDragDropListeners.remove(listener);
}
}
/**
* Callback interface used to retrieve views based on the current touch coordinates of the drag
* event. The {@link DragItemContainer} houses the draggable views that this {@link
* DragDropController} controls.
*/
public interface DragItemContainer {
PhoneFavoriteSquareTileView getViewForLocation(int x, int y);
}
}
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