1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
/*
* 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.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> onDragDropListeners = new ArrayList<OnDragDropListener>();
private final DragItemContainer dragItemContainer;
private final int[] locationOnScreen = new int[2];
public DragDropController(DragItemContainer dragItemContainer) {
this.dragItemContainer = 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) {
v.getLocationOnScreen(locationOnScreen);
x = x + locationOnScreen[0];
y = y + locationOnScreen[1];
final PhoneFavoriteSquareTileView tileView = dragItemContainer.getViewForLocation(x, y);
if (tileView == null) {
return false;
}
for (int i = 0; i < onDragDropListeners.size(); i++) {
onDragDropListeners.get(i).onDragStarted(x, y, tileView);
}
return true;
}
public void handleDragHovered(View v, int x, int y) {
v.getLocationOnScreen(locationOnScreen);
final int screenX = x + locationOnScreen[0];
final int screenY = y + locationOnScreen[1];
final PhoneFavoriteSquareTileView view = dragItemContainer.getViewForLocation(screenX, screenY);
for (int i = 0; i < onDragDropListeners.size(); i++) {
onDragDropListeners.get(i).onDragHovered(screenX, screenY, view);
}
}
public void handleDragFinished(int x, int y, boolean isRemoveView) {
if (isRemoveView) {
for (int i = 0; i < onDragDropListeners.size(); i++) {
onDragDropListeners.get(i).onDroppedOnRemove();
}
}
for (int i = 0; i < onDragDropListeners.size(); i++) {
onDragDropListeners.get(i).onDragFinished(x, y);
}
}
public void addOnDragDropListener(OnDragDropListener listener) {
if (!onDragDropListeners.contains(listener)) {
onDragDropListeners.add(listener);
}
}
public void removeOnDragDropListener(OnDragDropListener listener) {
if (onDragDropListeners.contains(listener)) {
onDragDropListeners.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);
}
}
|
