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Winson Chung7d3810d2011-10-07 13:11:56 -07001/*
2 * Copyright (C) 2011 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.Bitmap;
22import android.graphics.Canvas;
23import android.graphics.drawable.StateListDrawable;
24import android.view.View;
25
26public class HolographicViewHelper {
27
28 private final HolographicOutlineHelper mOutlineHelper = new HolographicOutlineHelper();
29 private final Canvas mTempCanvas = new Canvas();
30
31 private boolean mStatesUpdated;
32 private int mHighlightColor;
33
34 public HolographicViewHelper(Context context) {
35 Resources res = context.getResources();
36 mHighlightColor = res.getColor(android.R.color.holo_blue_light);
37 }
38
39 /**
40 * Generate the pressed/focused states if necessary.
41 */
42 void generatePressedFocusedStates(View v) {
43 if (!mStatesUpdated) {
44 mStatesUpdated = true;
45 Bitmap outline = createGlowingOutline(v, mTempCanvas, mHighlightColor, mHighlightColor);
46 FastBitmapDrawable d = new FastBitmapDrawable(outline);
47
48 StateListDrawable states = new StateListDrawable();
49 states.addState(new int[] {android.R.attr.state_pressed}, d);
50 states.addState(new int[] {android.R.attr.state_focused}, d);
51 v.setBackgroundDrawable(states);
52 }
53 }
54
55 /**
56 * Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
57 * Responsibility for the bitmap is transferred to the caller.
58 */
59 private Bitmap createGlowingOutline(View v, Canvas canvas, int outlineColor, int glowColor) {
60 final int padding = HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS;
61 final Bitmap b = Bitmap.createBitmap(
62 v.getWidth() + padding, v.getHeight() + padding, Bitmap.Config.ARGB_8888);
63
64 canvas.setBitmap(b);
65 canvas.save();
66 v.draw(canvas);
67 canvas.restore();
68 mOutlineHelper.applyOuterBlur(b, canvas, outlineColor);
69 canvas.setBitmap(null);
70
71 return b;
72 }
73}