Home | History | Annotate | Download | only in ui 
      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 
     17 package com.android.camera.ui;
     18 
     19 import android.content.Context;
     20 import android.graphics.Canvas;
     21 import android.util.AttributeSet;
     22 import android.view.MotionEvent;
     23 import android.view.View;
     24 import android.widget.FrameLayout;
     25 
     26 import java.util.ArrayList;
     27 import java.util.List;
     28 
     29 public 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