1/*
2 * Copyright (C) 2015 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.messaging.ui.mediapicker.camerafocus;
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    interface Renderer {
32
33        public boolean handlesTouch();
34        public boolean onTouchEvent(MotionEvent evt);
35        public void setOverlay(RenderOverlay overlay);
36        public void layout(int left, int top, int right, int bottom);
37        public void draw(Canvas canvas);
38
39    }
40
41    private RenderView mRenderView;
42    private List<Renderer> mClients;
43
44    // reverse list of touch clients
45    private List<Renderer> mTouchClients;
46    private int[] mPosition = new int[2];
47
48    public RenderOverlay(Context context, AttributeSet attrs) {
49        super(context, attrs);
50        mRenderView = new RenderView(context);
51        addView(mRenderView, new LayoutParams(LayoutParams.MATCH_PARENT,
52                LayoutParams.MATCH_PARENT));
53        mClients = new ArrayList<Renderer>(10);
54        mTouchClients = new ArrayList<Renderer>(10);
55        setWillNotDraw(false);
56
57        addRenderer(new PieRenderer(context));
58    }
59
60    public PieRenderer getPieRenderer() {
61        for (Renderer renderer : mClients) {
62            if (renderer instanceof PieRenderer) {
63                return (PieRenderer) renderer;
64            }
65        }
66        return null;
67    }
68
69    public void addRenderer(Renderer renderer) {
70        mClients.add(renderer);
71        renderer.setOverlay(this);
72        if (renderer.handlesTouch()) {
73            mTouchClients.add(0, renderer);
74        }
75        renderer.layout(getLeft(), getTop(), getRight(), getBottom());
76    }
77
78    public void addRenderer(int pos, Renderer renderer) {
79        mClients.add(pos, renderer);
80        renderer.setOverlay(this);
81        renderer.layout(getLeft(), getTop(), getRight(), getBottom());
82    }
83
84    public void remove(Renderer renderer) {
85        mClients.remove(renderer);
86        renderer.setOverlay(null);
87    }
88
89    public int getClientSize() {
90        return mClients.size();
91    }
92
93    @Override
94    public boolean dispatchTouchEvent(MotionEvent m) {
95        return false;
96    }
97
98    public boolean directDispatchTouch(MotionEvent m, Renderer target) {
99        mRenderView.setTouchTarget(target);
100        boolean res = super.dispatchTouchEvent(m);
101        mRenderView.setTouchTarget(null);
102        return res;
103    }
104
105    private void adjustPosition() {
106        getLocationInWindow(mPosition);
107    }
108
109    public int getWindowPositionX() {
110        return mPosition[0];
111    }
112
113    public int getWindowPositionY() {
114        return mPosition[1];
115    }
116
117    public void update() {
118        mRenderView.invalidate();
119    }
120
121    private class RenderView extends View {
122
123        private Renderer mTouchTarget;
124
125        public RenderView(Context context) {
126            super(context);
127            setWillNotDraw(false);
128        }
129
130        public void setTouchTarget(Renderer target) {
131            mTouchTarget = target;
132        }
133
134        @Override
135        public boolean onTouchEvent(MotionEvent evt) {
136            if (mTouchTarget != null) {
137                return mTouchTarget.onTouchEvent(evt);
138            }
139            if (mTouchClients != null) {
140                boolean res = false;
141                for (Renderer client : mTouchClients) {
142                    res |= client.onTouchEvent(evt);
143                }
144                return res;
145            }
146            return false;
147        }
148
149        @Override
150        public void onLayout(boolean changed, int left, int top, int right, int bottom) {
151            adjustPosition();
152            super.onLayout(changed, left,  top, right, bottom);
153            if (mClients == null) {
154                return;
155            }
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) {
165                return;
166            }
167            boolean redraw = false;
168            for (Renderer renderer : mClients) {
169                renderer.draw(canvas);
170                redraw = redraw || ((OverlayRenderer) renderer).isVisible();
171            }
172            if (redraw) {
173                invalidate();
174            }
175        }
176    }
177
178}