1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mobile/android/base/preferences/FontSizePreference.java Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,192 @@
1.4 +/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +package org.mozilla.gecko.preferences;
1.10 +
1.11 +import org.mozilla.gecko.R;
1.12 +
1.13 +import android.app.AlertDialog;
1.14 +import android.content.Context;
1.15 +import android.content.res.Resources;
1.16 +import android.graphics.Color;
1.17 +import android.preference.DialogPreference;
1.18 +import android.util.AttributeSet;
1.19 +import android.util.Log;
1.20 +import android.util.TypedValue;
1.21 +import android.view.LayoutInflater;
1.22 +import android.view.View;
1.23 +import android.view.ViewGroup;
1.24 +import android.widget.Button;
1.25 +import android.widget.ScrollView;
1.26 +import android.widget.TextView;
1.27 +
1.28 +import java.util.HashMap;
1.29 +
1.30 +class FontSizePreference extends DialogPreference {
1.31 + private static final String LOGTAG = "FontSizePreference";
1.32 + private static final int TWIP_TO_PT_RATIO = 20; // 20 twip = 1 point.
1.33 + private static final int PREVIEW_FONT_SIZE_UNIT = TypedValue.COMPLEX_UNIT_PT;
1.34 + private static final int DEFAULT_FONT_INDEX = 2;
1.35 +
1.36 + private final Context mContext;
1.37 + /** Container for mPreviewFontView to allow for scrollable padding at the top of the view. */
1.38 + private ScrollView mScrollingContainer;
1.39 + private TextView mPreviewFontView;
1.40 + private Button mIncreaseFontButton;
1.41 + private Button mDecreaseFontButton;
1.42 +
1.43 + private final String[] mFontTwipValues;
1.44 + private final String[] mFontSizeNames; // Ex: "Small".
1.45 + /** Index into the above arrays for the saved preference value (from Gecko). */
1.46 + private int mSavedFontIndex = DEFAULT_FONT_INDEX;
1.47 + /** Index into the above arrays for the currently displayed font size (the preview). */
1.48 + private int mPreviewFontIndex = mSavedFontIndex;
1.49 + private final HashMap<String, Integer> mFontTwipToIndexMap;
1.50 +
1.51 + public FontSizePreference(Context context, AttributeSet attrs) {
1.52 + super(context, attrs);
1.53 + mContext = context;
1.54 +
1.55 + final Resources res = mContext.getResources();
1.56 + mFontTwipValues = res.getStringArray(R.array.pref_font_size_values);
1.57 + mFontSizeNames = res.getStringArray(R.array.pref_font_size_entries);
1.58 + mFontTwipToIndexMap = new HashMap<String, Integer>();
1.59 + for (int i = 0; i < mFontTwipValues.length; ++i) {
1.60 + mFontTwipToIndexMap.put(mFontTwipValues[i], i);
1.61 + }
1.62 + }
1.63 +
1.64 + @Override
1.65 + protected void onPrepareDialogBuilder(AlertDialog.Builder builder) {
1.66 + final LayoutInflater inflater =
1.67 + (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
1.68 + View dialogView = inflater.inflate(R.layout.font_size_preference, null);
1.69 + initInternalViews(dialogView);
1.70 + updatePreviewFontSize(mFontTwipValues[mPreviewFontIndex]);
1.71 +
1.72 + builder.setTitle(null);
1.73 + builder.setView(dialogView);
1.74 + }
1.75 +
1.76 + /** Saves relevant views to instance variables and initializes their settings. */
1.77 + private void initInternalViews(View dialogView) {
1.78 + mScrollingContainer = (ScrollView) dialogView.findViewById(R.id.scrolling_container);
1.79 + // Background cannot be set in XML (see bug 783597 - TODO: Change this to XML when bug is fixed).
1.80 + mScrollingContainer.setBackgroundColor(Color.WHITE);
1.81 + mPreviewFontView = (TextView) dialogView.findViewById(R.id.preview);
1.82 +
1.83 + mDecreaseFontButton = (Button) dialogView.findViewById(R.id.decrease_preview_font_button);
1.84 + mIncreaseFontButton = (Button) dialogView.findViewById(R.id.increase_preview_font_button);
1.85 + setButtonState(mPreviewFontIndex);
1.86 + mDecreaseFontButton.setOnClickListener(new View.OnClickListener() {
1.87 + @Override
1.88 + public void onClick(View v) {
1.89 + mPreviewFontIndex = Math.max(mPreviewFontIndex - 1, 0);
1.90 + updatePreviewFontSize(mFontTwipValues[mPreviewFontIndex]);
1.91 + mIncreaseFontButton.setEnabled(true);
1.92 + // If we reached the minimum index, disable the button.
1.93 + if (mPreviewFontIndex == 0) {
1.94 + mDecreaseFontButton.setEnabled(false);
1.95 + }
1.96 + }
1.97 + });
1.98 + mIncreaseFontButton.setOnClickListener(new View.OnClickListener() {
1.99 + @Override
1.100 + public void onClick(View v) {
1.101 + mPreviewFontIndex = Math.min(mPreviewFontIndex + 1, mFontTwipValues.length - 1);
1.102 + updatePreviewFontSize(mFontTwipValues[mPreviewFontIndex]);
1.103 +
1.104 + mDecreaseFontButton.setEnabled(true);
1.105 + // If we reached the maximum index, disable the button.
1.106 + if (mPreviewFontIndex == mFontTwipValues.length - 1) {
1.107 + mIncreaseFontButton.setEnabled(false);
1.108 + }
1.109 + }
1.110 + });
1.111 + }
1.112 +
1.113 + @Override
1.114 + protected void onDialogClosed(boolean positiveResult) {
1.115 + super.onDialogClosed(positiveResult);
1.116 + if (!positiveResult) {
1.117 + mPreviewFontIndex = mSavedFontIndex;
1.118 + return;
1.119 + }
1.120 + mSavedFontIndex = mPreviewFontIndex;
1.121 + final String twipVal = mFontTwipValues[mSavedFontIndex];
1.122 + final OnPreferenceChangeListener prefChangeListener = getOnPreferenceChangeListener();
1.123 + if (prefChangeListener == null) {
1.124 + Log.e(LOGTAG, "PreferenceChangeListener is null. FontSizePreference will not be saved to Gecko.");
1.125 + return;
1.126 + }
1.127 + prefChangeListener.onPreferenceChange(this, twipVal);
1.128 + }
1.129 +
1.130 + /**
1.131 + * Finds the index of the given twip value and sets it as the saved preference value. Also the
1.132 + * current preview text size to the given value. Does not update the mPreviewFontView text size.
1.133 + */
1.134 + protected void setSavedFontSize(String twip) {
1.135 + final Integer index = mFontTwipToIndexMap.get(twip);
1.136 + if (index != null) {
1.137 + mSavedFontIndex = index;
1.138 + mPreviewFontIndex = mSavedFontIndex;
1.139 + return;
1.140 + }
1.141 + resetSavedFontSizeToDefault();
1.142 + Log.e(LOGTAG, "setSavedFontSize: Given font size does not exist in twip values map. Reverted to default font size.");
1.143 + }
1.144 +
1.145 + /**
1.146 + * Updates the mPreviewFontView to the given text size, resets the container's scroll to the top
1.147 + * left, and invalidates the view. Does not update the font indices.
1.148 + */
1.149 + private void updatePreviewFontSize(String twip) {
1.150 + float pt = convertTwipStrToPT(twip);
1.151 + // Android will not render a font size of 0 pt but for Gecko, 0 twip turns off font
1.152 + // inflation. Thus we special case 0 twip to display a renderable font size.
1.153 + if (pt == 0) {
1.154 + // Android adds an inexplicable extra margin on the smallest font size so to get around
1.155 + // this, we reinflate the view.
1.156 + ViewGroup parentView = (ViewGroup) mScrollingContainer.getParent();
1.157 + parentView.removeAllViews();
1.158 + final LayoutInflater inflater =
1.159 + (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
1.160 + View dialogView = inflater.inflate(R.layout.font_size_preference, parentView);
1.161 + initInternalViews(dialogView);
1.162 + mPreviewFontView.setTextSize(PREVIEW_FONT_SIZE_UNIT, 1);
1.163 + } else {
1.164 + mPreviewFontView.setTextSize(PREVIEW_FONT_SIZE_UNIT, pt);
1.165 + }
1.166 + mScrollingContainer.scrollTo(0, 0);
1.167 + }
1.168 +
1.169 + /**
1.170 + * Resets the font indices to the default value. Does not update the mPreviewFontView text size.
1.171 + */
1.172 + private void resetSavedFontSizeToDefault() {
1.173 + mSavedFontIndex = DEFAULT_FONT_INDEX;
1.174 + mPreviewFontIndex = mSavedFontIndex;
1.175 + }
1.176 +
1.177 + private void setButtonState(int index) {
1.178 + if (index == 0) {
1.179 + mDecreaseFontButton.setEnabled(false);
1.180 + } else if (index == mFontTwipValues.length - 1) {
1.181 + mIncreaseFontButton.setEnabled(false);
1.182 + }
1.183 + }
1.184 +
1.185 + /**
1.186 + * Returns the name of the font size (ex: "Small") at the currently saved preference value.
1.187 + */
1.188 + protected String getSavedFontSizeName() {
1.189 + return mFontSizeNames[mSavedFontIndex];
1.190 + }
1.191 +
1.192 + private float convertTwipStrToPT(String twip) {
1.193 + return Float.parseFloat(twip) / TWIP_TO_PT_RATIO;
1.194 + }
1.195 +}
