ClipRegionActivity.java revision 735738c4ddf3229caa5f6e634bf591953ac29944 
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.test.hwui;
18
19import android.app.Activity;
20import android.content.Context;
21import android.graphics.Canvas;
22import android.graphics.Region;
23import android.os.Bundle;
24import android.view.View;
25
26@SuppressWarnings({"UnusedDeclaration"})
27public class ClipRegionActivity extends Activity {
28    @Override
29    protected void onCreate(Bundle savedInstanceState) {
30        super.onCreate(savedInstanceState);
31        final RegionView view = new RegionView(this);
32        setContentView(view);
33    }
34
35    public static class RegionView extends View {
36        public RegionView(Context c) {
37            super(c);
38        }
39
40        @Override
41        protected void onDraw(Canvas canvas) {
42            super.onDraw(canvas);
43
44            canvas.save();
45            canvas.clipRect(100.0f, 100.0f, getWidth() - 100.0f, getHeight() - 100.0f,
46                    Region.Op.DIFFERENCE);
47            canvas.drawARGB(128, 255, 0, 0);
48            canvas.restore();
49
50            invalidate();
51        }
52    }
53}
54