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 } 67 68 public void addRenderer(int pos, Renderer renderer) { 69 mClients.add(pos, renderer); 70 renderer.setOverlay(this); 71 } 72 73 public void remove(Renderer renderer) { 74 mClients.remove(renderer); 75 renderer.setOverlay(null); 76 } 77 78 public int getClientSize() { 79 return mClients.size(); 80 } 81 82 @Override 83 public boolean dispatchTouchEvent(MotionEvent m) { 84 return false; 85 } 86 87 public boolean directDispatchTouch(MotionEvent m, Renderer target) { 88 mRenderView.setTouchTarget(target); 89 boolean res = super.dispatchTouchEvent(m); 90 mRenderView.setTouchTarget(null); 91 return res; 92 } 93 94 private void adjustPosition() { 95 getLocationInWindow(mPosition); 96 } 97 98 public int getWindowPositionX() { 99 return mPosition[0]; 100 } 101 102 public int getWindowPositionY() { 103 return mPosition[1]; 104 } 105 106 public void update() { 107 mRenderView.invalidate(); 108 } 109 110 private class RenderView extends View { 111 112 private Renderer mTouchTarget; 113 114 public RenderView(Context context) { 115 super(context); 116 setWillNotDraw(false); 117 } 118 119 public void setTouchTarget(Renderer target) { 120 mTouchTarget = target; 121 } 122 123 @Override 124 public boolean onTouchEvent(MotionEvent evt) { 125 if (mTouchTarget != null) { 126 return mTouchTarget.onTouchEvent(evt); 127 } 128 if (mTouchClients != null) { 129 boolean res = false; 130 for (Renderer client : mTouchClients) { 131 res |= client.onTouchEvent(evt); 132 } 133 return res; 134 } 135 return false; 136 } 137 138 @Override 139 public void layout(int left, int top, int right, int bottom) { 140 adjustPosition(); 141 super.layout(left, top, right, bottom); 142 if (mClients == null) return; 143 for (Renderer renderer : mClients) { 144 renderer.layout(left, top, right, bottom); 145 } 146 } 147 148 @Override 149 public void draw(Canvas canvas) { 150 super.draw(canvas); 151 if (mClients == null) return; 152 boolean redraw = false; 153 for (Renderer renderer : mClients) { 154 renderer.draw(canvas); 155 redraw = redraw || ((OverlayRenderer) renderer).isVisible(); 156 } 157 if (redraw) { 158 invalidate(); 159 } 160 } 161 } 162 163} 164