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;
24import android.widget.FrameLayout;
25
26import java.util.ArrayList;
27import java.util.List;
28
29public class RenderOverlay extends FrameLayout {
30
31    private static final String TAG = "CAM_Overlay";
32
33    interface Renderer {
34
35        public boolean handlesTouch();
36        public boolean onTouchEvent(MotionEvent evt);
37        public void setOverlay(RenderOverlay overlay);
38        public void layout(int left, int top, int right, int bottom);
39        public void draw(Canvas canvas);
40
41    }
42
43    private RenderView mRenderView;
44    private List<Renderer> mClients;
45
46    // reverse list of touch clients
47    private List<Renderer> mTouchClients;
48    private int[] mPosition = new int[2];
49
50    public RenderOverlay(Context context, AttributeSet attrs) {
51        super(context, attrs);
52        mRenderView = new RenderView(context);
53        addView(mRenderView, new LayoutParams(LayoutParams.MATCH_PARENT,
54                LayoutParams.MATCH_PARENT));
55        mClients = new ArrayList<Renderer>(10);
56        mTouchClients = new ArrayList<Renderer>(10);
57        setWillNotDraw(false);
58    }
59
60    public void addRenderer(Renderer renderer) {
61        mClients.add(renderer);
62        renderer.setOverlay(this);
63        if (renderer.handlesTouch()) {
64            mTouchClients.add(0, renderer);
65        }
66        renderer.layout(getLeft(), getTop(), getRight(), getBottom());
67    }
68
69    public void addRenderer(int pos, Renderer renderer) {
70        mClients.add(pos, renderer);
71        renderer.setOverlay(this);
72        renderer.layout(getLeft(), getTop(), getRight(), getBottom());
73    }
74
75    public void remove(Renderer renderer) {
76        mClients.remove(renderer);
77        renderer.setOverlay(null);
78    }
79
80    public int getClientSize() {
81        return mClients.size();
82    }
83
84    @Override
85    public boolean dispatchTouchEvent(MotionEvent m) {
86        return false;
87    }
88
89    public boolean directDispatchTouch(MotionEvent m, Renderer target) {
90        mRenderView.setTouchTarget(target);
91        boolean res = super.dispatchTouchEvent(m);
92        mRenderView.setTouchTarget(null);
93        return res;
94    }
95
96    private void adjustPosition() {
97        getLocationInWindow(mPosition);
98    }
99
100    public int getWindowPositionX() {
101        return mPosition[0];
102    }
103
104    public int getWindowPositionY() {
105        return mPosition[1];
106    }
107
108    public void update() {
109        mRenderView.invalidate();
110    }
111
112    private class RenderView extends View {
113
114        private Renderer mTouchTarget;
115
116        public RenderView(Context context) {
117            super(context);
118            setWillNotDraw(false);
119        }
120
121        public void setTouchTarget(Renderer target) {
122            mTouchTarget = target;
123        }
124
125        @Override
126        public boolean onTouchEvent(MotionEvent evt) {
127            if (mTouchTarget != null) {
128                return mTouchTarget.onTouchEvent(evt);
129            }
130            if (mTouchClients != null) {
131                boolean res = false;
132                for (Renderer client : mTouchClients) {
133                    res |= client.onTouchEvent(evt);
134                }
135                return res;
136            }
137            return false;
138        }
139
140        @Override
141        public void onLayout(boolean changed, int left, int top, int right, int bottom) {
142            adjustPosition();
143            super.onLayout(changed, left,  top, right, bottom);
144            if (mClients == null) return;
145            for (Renderer renderer : mClients) {
146                renderer.layout(left, top, right, bottom);
147            }
148        }
149
150        @Override
151        public void draw(Canvas canvas) {
152            super.draw(canvas);
153            if (mClients == null) return;
154            boolean redraw = false;
155            for (Renderer renderer : mClients) {
156                renderer.draw(canvas);
157                redraw = redraw || ((OverlayRenderer) renderer).isVisible();
158            }
159            if (redraw) {
160                invalidate();
161            }
162        }
163    }
164
165}
166