RenderOverlay.java revision ad639dff251233032734106afe4fe51a52be3721 
1/*
2 * Copyright (C) 2012 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.camera.ui;
18
19import android.content.Context;
20import android.graphics.Canvas;
21import android.util.AttributeSet;
22import android.view.MotionEvent;
23import android.view.View;
24
25import java.util.ArrayList;
26import java.util.List;
27
28public class RenderOverlay extends RotateLayout {
29
30    private static final String TAG = "CAM_Overlay";
31
32    interface Renderer {
33
34        public boolean handlesTouch();
35        public boolean onTouchEvent(MotionEvent evt);
36        public void setOverlay(RenderOverlay overlay);
37        public void layout(int left, int top, int right, int bottom);
38        public void draw(Canvas canvas);
39
40    }
41
42    private RenderView mRenderView;
43    private List<Renderer> mClients;
44
45    // reverse list of touch clients
46    private List<Renderer> mTouchClients;
47    private int[] mPosition = new int[2];
48
49    public RenderOverlay(Context context, AttributeSet attrs) {
50        super(context, attrs);
51        mRenderView = new RenderView(context);
52        addView(mRenderView, new LayoutParams(LayoutParams.MATCH_PARENT,
53                LayoutParams.MATCH_PARENT));
54        mClients = new ArrayList<Renderer>(10);
55        mTouchClients = new ArrayList<Renderer>(10);
56        setWillNotDraw(false);
57    }
58
59    public void addRenderer(Renderer renderer) {
60        mClients.add(renderer);
61        renderer.setOverlay(this);
62        if (renderer.handlesTouch()) {
63            mTouchClients.add(0, renderer);
64        }
65    }
66
67    public void addRenderer(int pos, Renderer renderer) {
68        mClients.add(pos, renderer);
69        renderer.setOverlay(this);
70    }
71
72    public void remove(Renderer renderer) {
73        mClients.remove(renderer);
74        renderer.setOverlay(null);
75    }
76
77    public int getClientSize() {
78        return mClients.size();
79    }
80
81    @Override
82    public boolean dispatchTouchEvent(MotionEvent m) {
83        return false;
84    }
85
86    public boolean directDispatchTouch(MotionEvent m, Renderer target) {
87        mRenderView.setTouchTarget(target);
88        boolean res = super.dispatchTouchEvent(m);
89        mRenderView.setTouchTarget(null);
90        return res;
91    }
92
93    private void adjustPosition() {
94        getLocationInWindow(mPosition);
95    }
96
97    public int getWindowPositionX() {
98        return mPosition[0];
99    }
100
101    public int getWindowPositionY() {
102        return mPosition[1];
103    }
104
105    public void update() {
106        mRenderView.invalidate();
107    }
108
109    private class RenderView extends View {
110
111        private Renderer mTouchTarget;
112
113        public RenderView(Context context) {
114            super(context);
115            setWillNotDraw(false);
116        }
117
118        public void setTouchTarget(Renderer target) {
119            mTouchTarget = target;
120        }
121
122        @Override
123        public boolean onTouchEvent(MotionEvent evt) {
124            if (mTouchTarget != null) {
125                return mTouchTarget.onTouchEvent(evt);
126            }
127            if (mTouchClients != null) {
128                boolean res = false;
129                for (Renderer client : mTouchClients) {
130                    res |= client.onTouchEvent(evt);
131                }
132                return res;
133            }
134            return false;
135        }
136
137        @Override
138        public void layout(int left, int top, int right, int bottom) {
139            adjustPosition();
140            super.layout(left,  top, right, bottom);
141            if (mClients == null) return;
142            for (Renderer renderer : mClients) {
143                renderer.layout(left, top, right, bottom);
144            }
145        }
146
147        @Override
148        public void draw(Canvas canvas) {
149            if (mClients == null) return;
150            boolean redraw = false;
151            for (Renderer renderer : mClients) {
152                renderer.draw(canvas);
153                redraw = redraw || ((OverlayRenderer) renderer).isVisible();
154            }
155            if (redraw) {
156                invalidate();
157            }
158        }
159    }
160
161}
162