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      1 /*
      2  * Copyright (C) 2011 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.browser.preferences;
     18 
     19 import android.content.Context;
     20 import android.content.SharedPreferences;
     21 import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
     22 import android.preference.Preference;
     23 import android.preference.PreferenceManager;
     24 import android.util.AttributeSet;
     25 import android.view.View;
     26 import android.view.ViewGroup;
     27 import android.webkit.WebView;
     28 
     29 import com.android.browser.R;
     30 
     31 public abstract class WebViewPreview extends Preference
     32         implements OnSharedPreferenceChangeListener {
     33 
     34     protected WebView mWebView;
     35 
     36     public WebViewPreview(
     37             Context context, AttributeSet attrs, int defStyle) {
     38         super(context, attrs, defStyle);
     39         init(context);
     40     }
     41 
     42     public WebViewPreview(Context context, AttributeSet attrs) {
     43         super(context, attrs);
     44         init(context);
     45     }
     46 
     47     public WebViewPreview(Context context) {
     48         super(context);
     49         init(context);
     50     }
     51 
     52     protected void init(Context context) {
     53         setLayoutResource(R.layout.webview_preview);
     54     }
     55 
     56     protected abstract void updatePreview();
     57 
     58     protected void setupWebView(WebView view) {}
     59 
     60     @Override
     61     protected View onCreateView(ViewGroup parent) {
     62         View root = super.onCreateView(parent);
     63         WebView webView = (WebView) root.findViewById(R.id.webview);
     64         // Tell WebView to really, truly ignore all touch events. No, seriously,
     65         // ignore them all. And don't show scrollbars.
     66         webView.setFocusable(false);
     67         webView.setFocusableInTouchMode(false);
     68         webView.setClickable(false);
     69         webView.setLongClickable(false);
     70         webView.setHorizontalScrollBarEnabled(false);
     71         webView.setVerticalScrollBarEnabled(false);
     72         setupWebView(webView);
     73         return root;
     74     }
     75 
     76     @Override
     77     protected void onBindView(View view) {
     78         super.onBindView(view);
     79         mWebView = (WebView) view.findViewById(R.id.webview);
     80         updatePreview();
     81     }
     82 
     83     @Override
     84     protected void onAttachedToHierarchy(PreferenceManager preferenceManager) {
     85         super.onAttachedToHierarchy(preferenceManager);
     86         getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
     87     }
     88 
     89     @Override
     90     protected void onPrepareForRemoval() {
     91         getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
     92         super.onPrepareForRemoval();
     93     }
     94 
     95     @Override
     96     public void onSharedPreferenceChanged(
     97             SharedPreferences sharedPreferences, String key) {
     98         updatePreview();
     99     }
    100 
    101 }
    102