mirror of
https://github.com/mozilla/gecko-dev.git
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191 lines
8.0 KiB
Java
191 lines
8.0 KiB
Java
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.gecko;
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import android.app.AlertDialog;
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import android.content.Context;
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import android.content.res.Resources;
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import android.graphics.Color;
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import android.preference.DialogPreference;
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import android.util.AttributeSet;
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import android.util.Log;
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import android.util.TypedValue;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.Button;
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import android.widget.ScrollView;
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import android.widget.TextView;
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import java.util.HashMap;
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class FontSizePreference extends DialogPreference {
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private static final String LOGTAG = "FontSizePreference";
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private static final int TWIP_TO_PT_RATIO = 20; // 20 twip = 1 point.
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private static final int PREVIEW_FONT_SIZE_UNIT = TypedValue.COMPLEX_UNIT_PT;
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private static final int DEFAULT_FONT_INDEX = 2;
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private final Context mContext;
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/** Container for mPreviewFontView to allow for scrollable padding at the top of the view. */
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private ScrollView mScrollingContainer;
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private TextView mPreviewFontView;
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private Button mIncreaseFontButton;
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private Button mDecreaseFontButton;
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private final String[] mFontTwipValues;
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private final String[] mFontSizeNames; // Ex: "Small".
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/** Index into the above arrays for the saved preference value (from Gecko). */
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private int mSavedFontIndex = DEFAULT_FONT_INDEX;
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/** Index into the above arrays for the currently displayed font size (the preview). */
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private int mPreviewFontIndex = mSavedFontIndex;
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private final HashMap<String, Integer> mFontTwipToIndexMap;
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public FontSizePreference(Context context, AttributeSet attrs) {
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super(context, attrs);
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mContext = context;
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final Resources res = mContext.getResources();
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mFontTwipValues = res.getStringArray(R.array.pref_font_size_values);
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mFontSizeNames = res.getStringArray(R.array.pref_font_size_entries);
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mFontTwipToIndexMap = new HashMap<String, Integer>();
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for (int i = 0; i < mFontTwipValues.length; ++i) {
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mFontTwipToIndexMap.put(mFontTwipValues[i], i);
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}
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}
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@Override
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protected void onPrepareDialogBuilder(AlertDialog.Builder builder) {
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final LayoutInflater inflater =
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(LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
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View dialogView = inflater.inflate(R.layout.font_size_preference, null);
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initInternalViews(dialogView);
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updatePreviewFontSize(mFontTwipValues[mPreviewFontIndex]);
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builder.setTitle(null);
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builder.setView(dialogView);
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}
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/** Saves relevant views to instance variables and initializes their settings. */
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private void initInternalViews(View dialogView) {
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mScrollingContainer = (ScrollView) dialogView.findViewById(R.id.scrolling_container);
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// Background cannot be set in XML (see bug 783597 - TODO: Change this to XML when bug is fixed).
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mScrollingContainer.setBackgroundColor(Color.WHITE);
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mPreviewFontView = (TextView) dialogView.findViewById(R.id.preview);
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mDecreaseFontButton = (Button) dialogView.findViewById(R.id.decrease_preview_font_button);
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mIncreaseFontButton = (Button) dialogView.findViewById(R.id.increase_preview_font_button);
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setButtonState(mPreviewFontIndex);
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mDecreaseFontButton.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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mPreviewFontIndex = Math.max(mPreviewFontIndex - 1, 0);
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updatePreviewFontSize(mFontTwipValues[mPreviewFontIndex]);
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mIncreaseFontButton.setEnabled(true);
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// If we reached the minimum index, disable the button.
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if (mPreviewFontIndex == 0) {
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mDecreaseFontButton.setEnabled(false);
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}
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}
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});
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mIncreaseFontButton.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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mPreviewFontIndex = Math.min(mPreviewFontIndex + 1, mFontTwipValues.length - 1);
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updatePreviewFontSize(mFontTwipValues[mPreviewFontIndex]);
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mDecreaseFontButton.setEnabled(true);
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// If we reached the maximum index, disable the button.
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if (mPreviewFontIndex == mFontTwipValues.length - 1) {
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mIncreaseFontButton.setEnabled(false);
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}
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}
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});
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}
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@Override
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protected void onDialogClosed(boolean positiveResult) {
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super.onDialogClosed(positiveResult);
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if (!positiveResult) {
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mPreviewFontIndex = mSavedFontIndex;
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return;
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}
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mSavedFontIndex = mPreviewFontIndex;
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final String twipVal = mFontTwipValues[mSavedFontIndex];
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final OnPreferenceChangeListener prefChangeListener = getOnPreferenceChangeListener();
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if (prefChangeListener == null) {
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Log.e(LOGTAG, "PreferenceChangeListener is null. FontSizePreference will not be saved to Gecko.");
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return;
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}
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prefChangeListener.onPreferenceChange(this, twipVal);
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}
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/**
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* Finds the index of the given twip value and sets it as the saved preference value. Also the
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* current preview text size to the given value. Does not update the mPreviewFontView text size.
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*/
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protected void setSavedFontSize(String twip) {
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final Integer index = mFontTwipToIndexMap.get(twip);
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if (index != null) {
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mSavedFontIndex = index;
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mPreviewFontIndex = mSavedFontIndex;
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return;
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}
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resetSavedFontSizeToDefault();
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Log.e(LOGTAG, "setSavedFontSize: Given font size does not exist in twip values map. Reverted to default font size.");
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}
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/**
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* Updates the mPreviewFontView to the given text size, resets the container's scroll to the top
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* left, and invalidates the view. Does not update the font indices.
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*/
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private void updatePreviewFontSize(String twip) {
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float pt = convertTwipStrToPT(twip);
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// Android will not render a font size of 0 pt but for Gecko, 0 twip turns off font
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// inflation. Thus we special case 0 twip to display a renderable font size.
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if (pt == 0) {
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// Android adds an inexplicable extra margin on the smallest font size so to get around
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// this, we reinflate the view.
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ViewGroup parentView = (ViewGroup) mScrollingContainer.getParent();
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parentView.removeAllViews();
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final LayoutInflater inflater =
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(LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
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View dialogView = inflater.inflate(R.layout.font_size_preference, parentView);
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initInternalViews(dialogView);
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mPreviewFontView.setTextSize(PREVIEW_FONT_SIZE_UNIT, 1);
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} else {
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mPreviewFontView.setTextSize(PREVIEW_FONT_SIZE_UNIT, pt);
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}
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mScrollingContainer.scrollTo(0, 0);
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}
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/**
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* Resets the font indices to the default value. Does not update the mPreviewFontView text size.
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*/
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private void resetSavedFontSizeToDefault() {
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mSavedFontIndex = DEFAULT_FONT_INDEX;
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mPreviewFontIndex = mSavedFontIndex;
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}
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private void setButtonState(int index) {
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if (index == 0) {
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mDecreaseFontButton.setEnabled(false);
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} else if (index == mFontTwipValues.length - 1) {
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mIncreaseFontButton.setEnabled(false);
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}
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}
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/**
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* Returns the name of the font size (ex: "Small") at the currently saved preference value.
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*/
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protected String getSavedFontSizeName() {
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return mFontSizeNames[mSavedFontIndex];
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}
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private float convertTwipStrToPT(String twip) {
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return Float.parseFloat(twip) / TWIP_TO_PT_RATIO;
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}
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}
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