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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
      5  * use this file except in compliance with the License. You may obtain a copy of
      6  * 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, WITHOUT
     12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
     13  * License for the specific language governing permissions and limitations under
     14  * the License.
     15  */
     16 
     17 package com.android.browser;
     18 
     19 import android.content.Context;
     20 import android.graphics.Canvas;
     21 import android.util.AttributeSet;
     22 import android.view.View;
     23 import android.webkit.WebView;
     24 import android.webkit.WebViewClassic;
     25 
     26 import java.util.Map;
     27 
     28 /**
     29  * Manage WebView scroll events
     30  */
     31 public class BrowserWebView extends WebView implements WebViewClassic.TitleBarDelegate {
     32 
     33     public interface OnScrollChangedListener {
     34         void onScrollChanged(int l, int t, int oldl, int oldt);
     35     }
     36 
     37     private boolean mBackgroundRemoved = false;
     38     private TitleBar mTitleBar;
     39     private OnScrollChangedListener mOnScrollChangedListener;
     40 
     41     /**
     42      * @param context
     43      * @param attrs
     44      * @param defStyle
     45      * @param javascriptInterfaces
     46      */
     47     public BrowserWebView(Context context, AttributeSet attrs, int defStyle,
     48             Map<String, Object> javascriptInterfaces, boolean privateBrowsing) {
     49         super(context, attrs, defStyle, javascriptInterfaces, privateBrowsing);
     50     }
     51 
     52     /**
     53      * @param context
     54      * @param attrs
     55      * @param defStyle
     56      */
     57     public BrowserWebView(
     58             Context context, AttributeSet attrs, int defStyle, boolean privateBrowsing) {
     59         super(context, attrs, defStyle, privateBrowsing);
     60     }
     61 
     62     /**
     63      * @param context
     64      * @param attrs
     65      */
     66     public BrowserWebView(Context context, AttributeSet attrs) {
     67         super(context, attrs);
     68     }
     69 
     70     /**
     71      * @param context
     72      */
     73     public BrowserWebView(Context context) {
     74         super(context);
     75     }
     76 
     77     public void setTitleBar(TitleBar title) {
     78         mTitleBar = title;
     79     }
     80 
     81     // From TitleBarDelegate
     82     @Override
     83     public int getTitleHeight() {
     84         return (mTitleBar != null) ? mTitleBar.getEmbeddedHeight() : 0;
     85     }
     86 
     87     // From TitleBarDelegate
     88     @Override
     89     public void onSetEmbeddedTitleBar(final View title) {
     90     }
     91 
     92     public boolean hasTitleBar() {
     93         return (mTitleBar != null);
     94     }
     95 
     96     @Override
     97     protected void onDraw(Canvas c) {
     98         super.onDraw(c);
     99         if (!mBackgroundRemoved && getRootView().getBackground() != null) {
    100             mBackgroundRemoved = true;
    101             post(new Runnable() {
    102                 public void run() {
    103                     getRootView().setBackgroundDrawable(null);
    104                 }
    105             });
    106         }
    107     }
    108 
    109     public void drawContent(Canvas c) {
    110         onDraw(c);
    111     }
    112 
    113     @Override
    114     protected void onScrollChanged(int l, int t, int oldl, int oldt) {
    115         super.onScrollChanged(l, t, oldl, oldt);
    116         if (mTitleBar != null) {
    117             mTitleBar.onScrollChanged();
    118         }
    119         if (mOnScrollChangedListener != null) {
    120             mOnScrollChangedListener.onScrollChanged(l, t, oldl, oldt);
    121         }
    122     }
    123 
    124     public void setOnScrollChangedListener(OnScrollChangedListener listener) {
    125         mOnScrollChangedListener = listener;
    126     }
    127 
    128     @Override
    129     public boolean showContextMenuForChild(View originalView) {
    130         return false;
    131     }
    132 
    133     @Override
    134     public void destroy() {
    135         BrowserSettings.getInstance().stopManagingSettings(getSettings());
    136         super.destroy();
    137     }
    138 
    139 }
    140