ButtonDropTarget.java revision 043f2af567178b82b0b41f12d379e7dd12da2936 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.launcher2;
18
19import android.content.Context;
20import android.content.res.Resources;
21import android.graphics.PointF;
22import android.graphics.Rect;
23import android.util.AttributeSet;
24import android.widget.TextView;
25
26import com.android.launcher.R;
27
28
29/**
30 * Implements a DropTarget.
31 */
32public class ButtonDropTarget extends TextView implements DropTarget, DragController.DragListener {
33
34    protected final int mTransitionDuration;
35
36    protected Launcher mLauncher;
37    private int mBottomDragPadding;
38    protected TextView mText;
39    protected SearchDropTargetBar mSearchDropTargetBar;
40
41    /** Whether this drop target is active for the current drag */
42    protected boolean mActive;
43
44    /** The paint applied to the drag view on hover */
45    protected int mHoverColor = 0;
46
47    public ButtonDropTarget(Context context, AttributeSet attrs) {
48        this(context, attrs, 0);
49    }
50
51    public ButtonDropTarget(Context context, AttributeSet attrs, int defStyle) {
52        super(context, attrs, defStyle);
53
54        Resources r = getResources();
55        mTransitionDuration = r.getInteger(R.integer.config_dropTargetBgTransitionDuration);
56        mBottomDragPadding = r.getDimensionPixelSize(R.dimen.drop_target_drag_padding);
57    }
58
59    void setLauncher(Launcher launcher) {
60        mLauncher = launcher;
61    }
62
63    public boolean acceptDrop(DragObject d) {
64        return false;
65    }
66
67    public void setSearchDropTargetBar(SearchDropTargetBar searchDropTargetBar) {
68        mSearchDropTargetBar = searchDropTargetBar;
69    }
70
71    public void onDrop(DragObject d) {
72    }
73
74    public void onFlingToDelete(DragObject d, int x, int y, PointF vec) {
75        // Do nothing
76    }
77
78    public void onDragEnter(DragObject d) {
79        d.dragView.setColor(mHoverColor);
80    }
81
82    public void onDragOver(DragObject d) {
83        // Do nothing
84    }
85
86    public void onDragExit(DragObject d) {
87        d.dragView.setColor(0);
88    }
89
90    public void onDragStart(DragSource source, Object info, int dragAction) {
91        // Do nothing
92    }
93
94    public boolean isDropEnabled() {
95        return mActive;
96    }
97
98    public void onDragEnd() {
99        // Do nothing
100    }
101
102    @Override
103    public void getHitRect(android.graphics.Rect outRect) {
104        super.getHitRect(outRect);
105        outRect.bottom += mBottomDragPadding;
106    }
107
108    Rect getIconRect(int itemWidth, int itemHeight, int drawableWidth, int drawableHeight) {
109        DragLayer dragLayer = mLauncher.getDragLayer();
110
111        // Find the rect to animate to (the view is center aligned)
112        Rect to = new Rect();
113        dragLayer.getViewRectRelativeToSelf(this, to);
114        int width = drawableWidth;
115        int height = drawableHeight;
116        int left = to.left + getPaddingLeft();
117        int top = to.top + (getMeasuredHeight() - height) / 2;
118        to.set(left, top, left + width, top + height);
119
120        // Center the destination rect about the trash icon
121        int xOffset = (int) -(itemWidth - width) / 2;
122        int yOffset = (int) -(itemHeight - height) / 2;
123        to.offset(xOffset, yOffset);
124
125        return to;
126    }
127
128    @Override
129    public DropTarget getDropTargetDelegate(DragObject d) {
130        return null;
131    }
132
133    public void getLocationInDragLayer(int[] loc) {
134        mLauncher.getDragLayer().getLocationInDragLayer(this, loc);
135    }
136}
137