AccessibilityPreferencesFragment.java revision 600928560852c7b9ffffbfc91ee9fe1016465329 
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
17package com.android.browser.preferences;
18
19import android.content.Context;
20import android.os.Bundle;
21import android.preference.Preference;
22import android.preference.PreferenceFragment;
23import android.webkit.WebView;
24
25import com.android.browser.BrowserSettings;
26import com.android.browser.PreferenceKeys;
27import com.android.browser.R;
28
29import java.text.NumberFormat;
30
31public 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