1 /*
2  * Copyright (C) 2015 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 
17 package com.android.systemui.statusbar.phone;
18 
19 import android.graphics.Canvas;
20 import android.graphics.Point;
21 import android.graphics.Rect;
22 import android.graphics.drawable.Drawable;
23 import android.view.View;
24 import android.widget.ImageView;
25 
26 /** Creates a scaled-up version of an app icon for dragging. */
27 class AppIconDragShadowBuilder extends View.DragShadowBuilder {
28     private final static int ICON_SCALE = 2;
29     final Drawable mDrawable;
30     final int mIconSize;  // Height and width in device-pixels.
31 
AppIconDragShadowBuilder(ImageView icon)32     public AppIconDragShadowBuilder(ImageView icon) {
33         mDrawable = icon.getDrawable();
34         // The Drawable may not be the same size as the ImageView, so use the ImageView size.
35         // The ImageView is not square because it has additional left and right padding to create
36         // a wider drop target, so use the height to create a square drag shadow.
37         mIconSize = icon.getHeight() * ICON_SCALE;
38     }
39 
40     @Override
onProvideShadowMetrics(Point size, Point touch)41     public void onProvideShadowMetrics(Point size, Point touch) {
42         size.set(mIconSize, mIconSize);
43         // Shift the drag shadow up slightly because the apps are at the bottom edge of the
44         // screen.
45         touch.set(mIconSize / 2, mIconSize * 2 / 3);
46     }
47 
48     @Override
onDrawShadow(Canvas canvas)49     public void onDrawShadow(Canvas canvas) {
50         // The Drawable's native bounds may be different than the source ImageView. Force it
51         // to the correct size.
52         Rect oldBounds = mDrawable.copyBounds();
53         mDrawable.setBounds(0, 0, mIconSize, mIconSize);
54         mDrawable.draw(canvas);
55         mDrawable.setBounds(oldBounds);
56     }
57 }
58