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 com.android.camera.PreviewGestures;
27
28import java.util.ArrayList;
29import java.util.List;
30
31public class RenderOverlay extends FrameLayout {
32
33    private static final String TAG = "CAM_Overlay";
34
35    interface Renderer {
36
37        public boolean handlesTouch();
38        public boolean onTouchEvent(MotionEvent evt);
39        public void setOverlay(RenderOverlay overlay);
40        public void layout(int left, int top, int right, int bottom);
41        public void draw(Canvas canvas);
42
43    }
44
45    private RenderView mRenderView;
46    private List<Renderer> mClients;
47    private PreviewGestures mGestures;
48    // reverse list of touch clients
49    private List<Renderer> mTouchClients;
50    private int[] mPosition = new int[2];
51
52    public RenderOverlay(Context context, AttributeSet attrs) {
53        super(context, attrs);
54        mRenderView = new RenderView(context);
55        addView(mRenderView, new LayoutParams(LayoutParams.MATCH_PARENT,
56                LayoutParams.MATCH_PARENT));
57        mClients = new ArrayList<Renderer>(10);
58        mTouchClients = new ArrayList<Renderer>(10);
59        setWillNotDraw(false);
60    }
61
62    public void setGestures(PreviewGestures gestures) {
63        mGestures = gestures;
64    }
65
66    public void addRenderer(Renderer renderer) {
67        mClients.add(renderer);
68        renderer.setOverlay(this);
69        if (renderer.handlesTouch()) {
70            mTouchClients.add(0, renderer);
71        }
72        renderer.layout(getLeft(), getTop(), getRight(), getBottom());
73    }
74
75    public void addRenderer(int pos, Renderer renderer) {
76        mClients.add(pos, renderer);
77        renderer.setOverlay(this);
78        renderer.layout(getLeft(), getTop(), getRight(), getBottom());
79    }
80
81    public void remove(Renderer renderer) {
82        mClients.remove(renderer);
83        renderer.setOverlay(null);
84    }
85
86    public int getClientSize() {
87        return mClients.size();
88    }
89
90    @Override
91    public boolean dispatchTouchEvent(MotionEvent m) {
92        if (mGestures != null) {
93            if (!mGestures.isEnabled()) return false;
94            mGestures.dispatchTouch(m);
95        }
96        return true;
97    }
98
99    public boolean directDispatchTouch(MotionEvent m, Renderer target) {
100        mRenderView.setTouchTarget(target);
101        boolean res = mRenderView.dispatchTouchEvent(m);
102        mRenderView.setTouchTarget(null);
103        return res;
104    }
105
106    private void adjustPosition() {
107        getLocationInWindow(mPosition);
108    }
109
110    public int getWindowPositionX() {
111        return mPosition[0];
112    }
113
114    public int getWindowPositionY() {
115        return mPosition[1];
116    }
117
118    public void update() {
119        mRenderView.invalidate();
120    }
121
122    private class RenderView extends View {
123
124        private Renderer mTouchTarget;
125
126        public RenderView(Context context) {
127            super(context);
128            setWillNotDraw(false);
129        }
130
131        public void setTouchTarget(Renderer target) {
132            mTouchTarget = target;
133        }
134
135        @Override
136        public boolean dispatchTouchEvent(MotionEvent evt) {
137
138            if (mTouchTarget != null) {
139                return mTouchTarget.onTouchEvent(evt);
140            }
141            if (mTouchClients != null) {
142                boolean res = false;
143                for (Renderer client : mTouchClients) {
144                    res |= client.onTouchEvent(evt);
145                }
146                return res;
147            }
148            return false;
149        }
150
151        @Override
152        public void onLayout(boolean changed, int left, int top, int right, int bottom) {
153            adjustPosition();
154            super.onLayout(changed, left,  top, right, bottom);
155            if (mClients == null) return;
156            for (Renderer renderer : mClients) {
157                renderer.layout(left, top, right, bottom);
158            }
159        }
160
161        @Override
162        public void draw(Canvas canvas) {
163            super.draw(canvas);
164            if (mClients == null) return;
165            boolean redraw = false;
166            for (Renderer renderer : mClients) {
167                renderer.draw(canvas);
168                redraw = redraw || ((OverlayRenderer) renderer).isVisible();
169            }
170            if (redraw) {
171                invalidate();
172            }
173        }
174    }
175
176}
177