The Tor Browser / file comparison

comparison: mobile/android/base/preferences/FontSizePreference.java

mobile/android/base/preferences/FontSizePreference.java

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TOR_BUG_3246
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1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
2 * This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 package org.mozilla.gecko.preferences;
7
8 import org.mozilla.gecko.R;
9
10 import android.app.AlertDialog;
11 import android.content.Context;
12 import android.content.res.Resources;
13 import android.graphics.Color;
14 import android.preference.DialogPreference;
15 import android.util.AttributeSet;
16 import android.util.Log;
17 import android.util.TypedValue;
18 import android.view.LayoutInflater;
19 import android.view.View;
20 import android.view.ViewGroup;
21 import android.widget.Button;
22 import android.widget.ScrollView;
23 import android.widget.TextView;
24
25 import java.util.HashMap;
26
27 class FontSizePreference extends DialogPreference {
28 private static final String LOGTAG = "FontSizePreference";
29 private static final int TWIP_TO_PT_RATIO = 20; // 20 twip = 1 point.
30 private static final int PREVIEW_FONT_SIZE_UNIT = TypedValue.COMPLEX_UNIT_PT;
31 private static final int DEFAULT_FONT_INDEX = 2;
32
33 private final Context mContext;
34 /** Container for mPreviewFontView to allow for scrollable padding at the top of the view. */
35 private ScrollView mScrollingContainer;
36 private TextView mPreviewFontView;
37 private Button mIncreaseFontButton;
38 private Button mDecreaseFontButton;
39
40 private final String[] mFontTwipValues;
41 private final String[] mFontSizeNames; // Ex: "Small".
42 /** Index into the above arrays for the saved preference value (from Gecko). */
43 private int mSavedFontIndex = DEFAULT_FONT_INDEX;
44 /** Index into the above arrays for the currently displayed font size (the preview). */
45 private int mPreviewFontIndex = mSavedFontIndex;
46 private final HashMap<String, Integer> mFontTwipToIndexMap;
47
48 public FontSizePreference(Context context, AttributeSet attrs) {
49 super(context, attrs);
50 mContext = context;
51
52 final Resources res = mContext.getResources();
53 mFontTwipValues = res.getStringArray(R.array.pref_font_size_values);
54 mFontSizeNames = res.getStringArray(R.array.pref_font_size_entries);
55 mFontTwipToIndexMap = new HashMap<String, Integer>();
56 for (int i = 0; i < mFontTwipValues.length; ++i) {
57 mFontTwipToIndexMap.put(mFontTwipValues[i], i);
58 }
59 }
60
61 @Override
62 protected void onPrepareDialogBuilder(AlertDialog.Builder builder) {
63 final LayoutInflater inflater =
64 (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
65 View dialogView = inflater.inflate(R.layout.font_size_preference, null);
66 initInternalViews(dialogView);
67 updatePreviewFontSize(mFontTwipValues[mPreviewFontIndex]);
68
69 builder.setTitle(null);
70 builder.setView(dialogView);
71 }
72
73 /** Saves relevant views to instance variables and initializes their settings. */
74 private void initInternalViews(View dialogView) {
75 mScrollingContainer = (ScrollView) dialogView.findViewById(R.id.scrolling_container);
76 // Background cannot be set in XML (see bug 783597 - TODO: Change this to XML when bug is fixed).
77 mScrollingContainer.setBackgroundColor(Color.WHITE);
78 mPreviewFontView = (TextView) dialogView.findViewById(R.id.preview);
79
80 mDecreaseFontButton = (Button) dialogView.findViewById(R.id.decrease_preview_font_button);
81 mIncreaseFontButton = (Button) dialogView.findViewById(R.id.increase_preview_font_button);
82 setButtonState(mPreviewFontIndex);
83 mDecreaseFontButton.setOnClickListener(new View.OnClickListener() {
84 @Override
85 public void onClick(View v) {
86 mPreviewFontIndex = Math.max(mPreviewFontIndex - 1, 0);
87 updatePreviewFontSize(mFontTwipValues[mPreviewFontIndex]);
88 mIncreaseFontButton.setEnabled(true);
89 // If we reached the minimum index, disable the button.
90 if (mPreviewFontIndex == 0) {
91 mDecreaseFontButton.setEnabled(false);
92 }
93 }
94 });
95 mIncreaseFontButton.setOnClickListener(new View.OnClickListener() {
96 @Override
97 public void onClick(View v) {
98 mPreviewFontIndex = Math.min(mPreviewFontIndex + 1, mFontTwipValues.length - 1);
99 updatePreviewFontSize(mFontTwipValues[mPreviewFontIndex]);
100
101 mDecreaseFontButton.setEnabled(true);
102 // If we reached the maximum index, disable the button.
103 if (mPreviewFontIndex == mFontTwipValues.length - 1) {
104 mIncreaseFontButton.setEnabled(false);
105 }
106 }
107 });
108 }
109
110 @Override
111 protected void onDialogClosed(boolean positiveResult) {
112 super.onDialogClosed(positiveResult);
113 if (!positiveResult) {
114 mPreviewFontIndex = mSavedFontIndex;
115 return;
116 }
117 mSavedFontIndex = mPreviewFontIndex;
118 final String twipVal = mFontTwipValues[mSavedFontIndex];
119 final OnPreferenceChangeListener prefChangeListener = getOnPreferenceChangeListener();
120 if (prefChangeListener == null) {
121 Log.e(LOGTAG, "PreferenceChangeListener is null. FontSizePreference will not be saved to Gecko.");
122 return;
123 }
124 prefChangeListener.onPreferenceChange(this, twipVal);
125 }
126
127 /**
128 * Finds the index of the given twip value and sets it as the saved preference value. Also the
129 * current preview text size to the given value. Does not update the mPreviewFontView text size.
130 */
131 protected void setSavedFontSize(String twip) {
132 final Integer index = mFontTwipToIndexMap.get(twip);
133 if (index != null) {
134 mSavedFontIndex = index;
135 mPreviewFontIndex = mSavedFontIndex;
136 return;
137 }
138 resetSavedFontSizeToDefault();
139 Log.e(LOGTAG, "setSavedFontSize: Given font size does not exist in twip values map. Reverted to default font size.");
140 }
141
142 /**
143 * Updates the mPreviewFontView to the given text size, resets the container's scroll to the top
144 * left, and invalidates the view. Does not update the font indices.
145 */
146 private void updatePreviewFontSize(String twip) {
147 float pt = convertTwipStrToPT(twip);
148 // Android will not render a font size of 0 pt but for Gecko, 0 twip turns off font
149 // inflation. Thus we special case 0 twip to display a renderable font size.
150 if (pt == 0) {
151 // Android adds an inexplicable extra margin on the smallest font size so to get around
152 // this, we reinflate the view.
153 ViewGroup parentView = (ViewGroup) mScrollingContainer.getParent();
154 parentView.removeAllViews();
155 final LayoutInflater inflater =
156 (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
157 View dialogView = inflater.inflate(R.layout.font_size_preference, parentView);
158 initInternalViews(dialogView);
159 mPreviewFontView.setTextSize(PREVIEW_FONT_SIZE_UNIT, 1);
160 } else {
161 mPreviewFontView.setTextSize(PREVIEW_FONT_SIZE_UNIT, pt);
162 }
163 mScrollingContainer.scrollTo(0, 0);
164 }
165
166 /**
167 * Resets the font indices to the default value. Does not update the mPreviewFontView text size.
168 */
169 private void resetSavedFontSizeToDefault() {
170 mSavedFontIndex = DEFAULT_FONT_INDEX;
171 mPreviewFontIndex = mSavedFontIndex;
172 }
173
174 private void setButtonState(int index) {
175 if (index == 0) {
176 mDecreaseFontButton.setEnabled(false);
177 } else if (index == mFontTwipValues.length - 1) {
178 mIncreaseFontButton.setEnabled(false);
179 }
180 }
181
182 /**
183 * Returns the name of the font size (ex: "Small") at the currently saved preference value.
184 */
185 protected String getSavedFontSizeName() {
186 return mFontSizeNames[mSavedFontIndex];
187 }
188
189 private float convertTwipStrToPT(String twip) {
190 return Float.parseFloat(twip) / TWIP_TO_PT_RATIO;
191 }
192 }

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