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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.WebChromeClient;
     24 import android.webkit.WebStorage;
     25 import android.webkit.WebView;
     26 import android.webkit.WebViewClient;
     27 
     28 import java.util.Map;
     29 
     30 /**
     31  * Manage WebView scroll events
     32  */
     33 public class BrowserWebView extends WebView {
     34 
     35     public interface OnScrollChangedListener {
     36         void onScrollChanged(int l, int t, int oldl, int oldt);
     37     }
     38 
     39     private boolean mBackgroundRemoved = false;
     40     private TitleBar mTitleBar;
     41     private OnScrollChangedListener mOnScrollChangedListener;
     42     private WebChromeClient mWebChromeClient;
     43     private WebViewClient mWebViewClient;
     44 
     45     /**
     46      * @param context
     47      * @param attrs
     48      * @param defStyle
     49      * @param javascriptInterfaces
     50      */
     51     public BrowserWebView(Context context, AttributeSet attrs, int defStyle,
     52             Map<String, Object> javascriptInterfaces, boolean privateBrowsing) {
     53         super(context, attrs, defStyle, javascriptInterfaces, privateBrowsing);
     54     }
     55 
     56     /**
     57      * @param context
     58      * @param attrs
     59      * @param defStyle
     60      */
     61     public BrowserWebView(
     62             Context context, AttributeSet attrs, int defStyle, boolean privateBrowsing) {
     63         super(context, attrs, defStyle, privateBrowsing);
     64     }
     65 
     66     /**
     67      * @param context
     68      * @param attrs
     69      */
     70     public BrowserWebView(Context context, AttributeSet attrs) {
     71         super(context, attrs);
     72     }
     73 
     74     /**
     75      * @param context
     76      */
     77     public BrowserWebView(Context context) {
     78         super(context);
     79     }
     80 
     81     @Override
     82     public void setWebChromeClient(WebChromeClient client) {
     83         mWebChromeClient = client;
     84         super.setWebChromeClient(client);
     85     }
     86 
     87     public WebChromeClient getWebChromeClient() {
     88       return mWebChromeClient;
     89     }
     90 
     91     @Override
     92     public void setWebViewClient(WebViewClient client) {
     93         mWebViewClient = client;
     94         super.setWebViewClient(client);
     95     }
     96 
     97     public WebViewClient getWebViewClient() {
     98       return mWebViewClient;
     99     }
    100 
    101     public void setTitleBar(TitleBar title) {
    102         mTitleBar = title;
    103     }
    104 
    105     public int getTitleHeight() {
    106         return (mTitleBar != null) ? mTitleBar.getEmbeddedHeight() : 0;
    107     }
    108 
    109     public boolean hasTitleBar() {
    110         return (mTitleBar != null);
    111     }
    112 
    113     @Override
    114     protected void onDraw(Canvas c) {
    115         super.onDraw(c);
    116         if (!mBackgroundRemoved && getRootView().getBackground() != null) {
    117             mBackgroundRemoved = true;
    118             post(new Runnable() {
    119                 public void run() {
    120                     getRootView().setBackgroundDrawable(null);
    121                 }
    122             });
    123         }
    124     }
    125 
    126     public void drawContent(Canvas c) {
    127         onDraw(c);
    128     }
    129 
    130     @Override
    131     protected void onScrollChanged(int l, int t, int oldl, int oldt) {
    132         super.onScrollChanged(l, t, oldl, oldt);
    133         if (mTitleBar != null) {
    134             mTitleBar.onScrollChanged();
    135         }
    136         if (mOnScrollChangedListener != null) {
    137             mOnScrollChangedListener.onScrollChanged(l, t, oldl, oldt);
    138         }
    139     }
    140 
    141     public void setOnScrollChangedListener(OnScrollChangedListener listener) {
    142         mOnScrollChangedListener = listener;
    143     }
    144 
    145     @Override
    146     public boolean showContextMenuForChild(View originalView) {
    147         return false;
    148     }
    149 
    150     @Override
    151     public void destroy() {
    152         BrowserSettings.getInstance().stopManagingSettings(getSettings());
    153         super.destroy();
    154     }
    155 
    156 }
    157