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      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.view.MotionEvent;
     22 
     23 public abstract class OverlayRenderer implements RenderOverlay.Renderer {
     24 
     25     private static final String TAG = "CAM OverlayRenderer";
     26     protected RenderOverlay mOverlay;
     27 
     28     protected int mLeft, mTop, mRight, mBottom;
     29 
     30     protected boolean mVisible;
     31 
     32     public void setVisible(boolean vis) {
     33         mVisible = vis;
     34         update();
     35     }
     36 
     37     public boolean isVisible() {
     38         return mVisible;
     39     }
     40 
     41     // default does not handle touch
     42     @Override
     43     public boolean handlesTouch() {
     44         return false;
     45     }
     46 
     47     @Override
     48     public boolean onTouchEvent(MotionEvent evt) {
     49         return false;
     50     }
     51 
     52     public abstract void onDraw(Canvas canvas);
     53 
     54     public void draw(Canvas canvas) {
     55         if (mVisible) {
     56             onDraw(canvas);
     57         }
     58     }
     59 
     60     @Override
     61     public void setOverlay(RenderOverlay overlay) {
     62         mOverlay = overlay;
     63     }
     64 
     65     @Override
     66     public void layout(int left, int top, int right, int bottom) {
     67         mLeft = left;
     68         mRight = right;
     69         mTop = top;
     70         mBottom = bottom;
     71     }
     72 
     73     protected Context getContext() {
     74         if (mOverlay != null) {
     75             return mOverlay.getContext();
     76         } else {
     77             return null;
     78         }
     79     }
     80 
     81     public int getWidth() {
     82         return mRight - mLeft;
     83     }
     84 
     85     public int getHeight() {
     86         return mBottom - mTop;
     87     }
     88 
     89     protected void update() {
     90         if (mOverlay != null) {
     91             mOverlay.update();
     92         }
     93     }
     94 
     95 }
     96