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
|
/*
* Copyright (C) 2011 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.launcher2;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.PorterDuff;
import android.graphics.drawable.StateListDrawable;
import android.widget.ImageView;
public class HolographicViewHelper {
private final Canvas mTempCanvas = new Canvas();
private boolean mStatesUpdated;
private int mHighlightColor;
public HolographicViewHelper(Context context) {
Resources res = context.getResources();
mHighlightColor = res.getColor(android.R.color.holo_blue_light);
}
/**
* Generate the pressed/focused states if necessary.
*/
void generatePressedFocusedStates(ImageView v) {
if (!mStatesUpdated && v != null) {
mStatesUpdated = true;
Bitmap outline = createGlowingOutline(v, mTempCanvas);
FastBitmapDrawable d = new FastBitmapDrawable(outline);
StateListDrawable states = new StateListDrawable();
states.addState(new int[] {android.R.attr.state_pressed}, d);
states.addState(new int[] {android.R.attr.state_focused}, d);
states.addState(new int[] {}, v.getDrawable());
v.setImageDrawable(states);
}
}
/**
* Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
* Responsibility for the bitmap is transferred to the caller.
*/
private Bitmap createGlowingOutline(ImageView v, Canvas canvas) {
final int padding = HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS;
final Bitmap b = Bitmap.createBitmap(
v.getWidth() + padding, v.getHeight() + padding, Bitmap.Config.ARGB_8888);
canvas.setBitmap(b);
canvas.save();
v.getDrawable().draw(canvas);
canvas.restore();
canvas.drawColor(mHighlightColor, PorterDuff.Mode.SRC_IN);
canvas.setBitmap(null);
return b;
}
}
|