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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.os.Bundle;
     21 import android.preference.Preference;
     22 import android.preference.PreferenceFragment;
     23 import android.webkit.WebView;
     24 
     25 import com.android.browser.BrowserSettings;
     26 import com.android.browser.PreferenceKeys;
     27 import com.android.browser.R;
     28 
     29 import java.text.NumberFormat;
     30 
     31 public class AccessibilityPreferencesFragment extends PreferenceFragment
     32         implements Preference.OnPreferenceChangeListener {
     33 
     34     NumberFormat mFormat;
     35     // Used to pause/resume timers, which are required for WebViewPreview
     36     WebView mControlWebView;
     37 
     38     @Override
     39     public void onCreate(Bundle savedInstanceState) {
     40         super.onCreate(savedInstanceState);
     41         mControlWebView = new WebView(getActivity());
     42         addPreferencesFromResource(R.xml.accessibility_preferences);
     43         BrowserSettings settings = BrowserSettings.getInstance();
     44         mFormat = NumberFormat.getPercentInstance();
     45 
     46         Preference e = findPreference(PreferenceKeys.PREF_MIN_FONT_SIZE);
     47         e.setOnPreferenceChangeListener(this);
     48         updateMinFontSummary(e, settings.getMinimumFontSize());
     49         e = findPreference(PreferenceKeys.PREF_TEXT_ZOOM);
     50         e.setOnPreferenceChangeListener(this);
     51         updateTextZoomSummary(e, settings.getTextZoom());
     52         e = findPreference(PreferenceKeys.PREF_DOUBLE_TAP_ZOOM);
     53         e.setOnPreferenceChangeListener(this);
     54         updateDoubleTapZoomSummary(e, settings.getDoubleTapZoom());
     55         e = findPreference(PreferenceKeys.PREF_INVERTED_CONTRAST);
     56         e.setOnPreferenceChangeListener(this);
     57         updateInvertedContrastSummary(e, (int) (settings.getInvertedContrast() * 100));
     58     }
     59 
     60     @Override
     61     public void onResume() {
     62         super.onResume();
     63         mControlWebView.resumeTimers();
     64     }
     65 
     66     @Override
     67     public void onPause() {
     68         super.onPause();
     69         mControlWebView.pauseTimers();
     70     }
     71 
     72     @Override
     73     public void onDestroy() {
     74         super.onDestroy();
     75         mControlWebView.destroy();
     76         mControlWebView = null;
     77     }
     78 
     79     void updateMinFontSummary(Preference pref, int minFontSize) {
     80         Context c = getActivity();
     81         pref.setSummary(c.getString(R.string.pref_min_font_size_value, minFontSize));
     82     }
     83 
     84     void updateTextZoomSummary(Preference pref, int textZoom) {
     85         pref.setSummary(mFormat.format(textZoom / 100.0));
     86     }
     87 
     88     void updateDoubleTapZoomSummary(Preference pref, int doubleTapZoom) {
     89         pref.setSummary(mFormat.format(doubleTapZoom / 100.0));
     90     }
     91 
     92     void updateInvertedContrastSummary(Preference pref, int contrast) {
     93         pref.setSummary(mFormat.format(contrast / 100.0));
     94     }
     95 
     96     @Override
     97     public boolean onPreferenceChange(Preference pref, Object objValue) {
     98         if (getActivity() == null) {
     99             // We aren't attached, so don't accept preferences changes from the
    100             // invisible UI.
    101             return false;
    102         }
    103 
    104         if (PreferenceKeys.PREF_MIN_FONT_SIZE.equals(pref.getKey())) {
    105             updateMinFontSummary(pref, BrowserSettings
    106                     .getAdjustedMinimumFontSize((Integer) objValue));
    107         }
    108         if (PreferenceKeys.PREF_TEXT_ZOOM.equals(pref.getKey())) {
    109             BrowserSettings settings = BrowserSettings.getInstance();
    110             updateTextZoomSummary(pref, settings
    111                     .getAdjustedTextZoom((Integer) objValue));
    112         }
    113         if (PreferenceKeys.PREF_DOUBLE_TAP_ZOOM.equals(pref.getKey())) {
    114             BrowserSettings settings = BrowserSettings.getInstance();
    115             updateDoubleTapZoomSummary(pref, settings
    116                     .getAdjustedDoubleTapZoom((Integer) objValue));
    117         }
    118         if (PreferenceKeys.PREF_INVERTED_CONTRAST.equals(pref.getKey())) {
    119             updateInvertedContrastSummary(pref,
    120                     (int) ((10 + (Integer) objValue) * 10));
    121         }
    122         return true;
    123     }
    124 
    125 }
    126