gecko-dev/toolkit/content/inlineSpellCheckUI.js

# -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is Inline spellcheck code
#
# The Initial Developer of the Original Code is
# Google Inc.
# Portions created by the Initial Developer are Copyright (C) 2005
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
#   Brett Wilson <brettw@gmail.com>
#
# Alternatively, the contents of this file may be used under the terms of
# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
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# decision by deleting the provisions above and replace them with the notice
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# the provisions above, a recipient may use your version of this file under
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# ***** END LICENSE BLOCK *****

var InlineSpellCheckerUI = {

  // Call this function to initialize for a given edit element
  init: function(inputElt)
  {
    this.uninit();
    this.mEditor = inputElt.QueryInterface(Components.interfaces.nsIDOMNSEditableElement).editor;
    try {
      this.mInlineSpellChecker = this.mEditor.getInlineSpellChecker(true);
      // note: this might have been NULL if there is no chance we can spellcheck
    } catch(e) {
      this.mInlineSpellChecker = null;
    }
  },

  // call this to clear state
  uninit: function()
  {
    this.mInlineSpellChecker = null;
    this.mOverMisspelling = false;
    this.mMisspelling = "";
    this.mMenu = null;
    this.mSpellSuggestions = []; // text of words
    this.mSuggestionItems = [];  // menuitem nodes
    this.mDictionaryMenu = null;
    this.mDictionaryNames = [];
    this.mDictionaryItems = [];
  },

  // for each UI event, you must call this function, it will compute the
  // word the cursor is over
  initFromEvent: function(event)
  {
    this.mOverMisspelling = false;
    this.mEvent = event;

    if (! this.mInlineSpellChecker || ! (event instanceof UIEvent))
      return;

    var selcon = this.mEditor.selectionController;
    var spellsel = selcon.getSelection(selcon.SELECTION_SPELLCHECK);
    if (spellsel.rangeCount == 0)
      return; // easy case - no misspellings

    var range = this.mInlineSpellChecker.getMispelledWord(event.rangeParent,
                                                          event.rangeOffset);
    if (! range)
      return; // not over a misspelled word

    this.mMisspelling = range.toString();
    this.mOverMisspelling = true;
    this.mWordNode = event.rangeParent;
    this.mWordOffset = event.rangeOffset;
  },

  // returns false if there should be no spellchecking UI enabled at all, true
  // means that you can at least give the user the ability to turn it on.
  get canSpellCheck()
  {
    // inline spell checker objects will be created only if there are actual
    // dictionaries available
    return (this.mInlineSpellChecker != null);
  },

  // Whether spellchecking is enabled in the current box
  get enabled()
  {
    return (this.mInlineSpellChecker &&
            this.mInlineSpellChecker.enableRealTimeSpell);
  },
  set enabled(isEnabled)
  {
    if (this.mInlineSpellChecker)
      this.mInlineSpellChecker.enableRealTimeSpell = isEnabled;
  },

  // returns true if the given event is over a misspelled word
  get overMisspelling()
  {
    return this.mOverMisspelling;
  },

  // this prepends up to "maxNumber" suggestions at the given menu position
  // for the word under the cursor. Returns the number of suggestions inserted.
  addSuggestionsToMenu: function(menu, insertBefore, maxNumber)
  {
    if (! this.mInlineSpellChecker || ! this.mOverMisspelling)
      return 0; // nothing to do

    var spellchecker = this.mInlineSpellChecker.spellChecker;
    if (! spellchecker.CheckCurrentWord(this.mMisspelling))
      return 0;  // word seems not misspelled after all (?)

    this.mMenu = menu;
    this.mSpellSuggestions = [];
    this.mSuggestionItems = [];
    for (var i = 0; i < maxNumber; i ++) {
      var suggestion = spellchecker.GetSuggestedWord();
      if (! suggestion.length)
        break;
      this.mSpellSuggestions.push(suggestion);

      var item = document.createElement("menuitem");
      this.mSuggestionItems.push(item);
      item.setAttribute("label", suggestion);
      item.setAttribute("value", suggestion);
      // this function thing is necessary to generate a callback with the
      // correct binding of "val" (the index in this loop).
      var callback = function(me, val) { return function(evt) { me.replaceMisspelling(val); } };
      item.addEventListener("command", callback(this, i), true);
      item.setAttribute("class", "spell-suggestion");
      menu.insertBefore(item, insertBefore);
    }
    return this.mSpellSuggestions.length;
  },

  // undoes the work of addSuggestionsToMenu for the same menu
  // (call from popup hiding)
  clearSuggestionsFromMenu: function()
  {
    for (var i = 0; i < this.mSuggestionItems.length; i ++) {
      this.mMenu.removeChild(this.mSuggestionItems[i]);
    }
    this.mSuggestionItems = [];
  },

  // returns the number of dictionary languages. If insertBefore is NULL, this
  // does an append to the given menu
  addDictionaryListToMenu: function(menu, insertBefore)
  {
    this.mDictionaryMenu = menu;
    this.mDictionaryNames = [];
    this.mDictionaryItems = [];

    if (! this.mInlineSpellChecker || ! this.enabled)
      return 0;
    var spellchecker = this.mInlineSpellChecker.spellChecker;
    var o1 = {}, o2 = {};
    spellchecker.GetDictionaryList(o1, o2);
    var list = o1.value;
    var listcount = o2.value;
    var curlang = spellchecker.GetCurrentDictionary();

    for (var i = 0; i < list.length; i ++) {
      this.mDictionaryNames.push(list[i]);
      var item = document.createElement("menuitem");
      item.setAttribute("label", list[i]);
      item.setAttribute("type", "checkbox");
      this.mDictionaryItems.push(item);
      if (curlang == list[i]) {
        item.setAttribute("checked", "true");
      } else {
        var callback = function(me, val) { return function(evt) { me.selectDictionary(val); } };
        item.addEventListener("command", callback(this, i), true);
      }
      if (insertBefore)
        menu.insertBefore(item, insertBefore);
      else
        menu.appendChild(item);
    }
    return list.length;
  },

  // undoes the work of addDictionaryListToMenu for the menu
  // (call on popup hiding)
  clearDictionaryListFromMenu: function()
  {
    for (var i = 0; i < this.mDictionaryItems.length; i ++) {
      this.mDictionaryMenu.removeChild(this.mDictionaryItems[i]);
    }
    this.mDictionaryItems = [];
  },

  // callback for selecting a dictionary
  selectDictionary: function(index)
  {
    if (! this.mInlineSpellChecker || index < 0 || index >= this.mDictionaryNames.length)
      return;
    this.mInlineSpellChecker.spellChecker.SetCurrentDictionary(this.mDictionaryNames[index]);
    this.mInlineSpellChecker.spellCheckRange(null); // causes recheck
  },

  // callback for selecting a suggesteed replacement
  replaceMisspelling: function(index)
  {
    if (! this.mInlineSpellChecker || ! this.mOverMisspelling)
      return;
    if (index < 0 || index >= this.mSpellSuggestions.length)
      return;
    this.mInlineSpellChecker.replaceWord(this.mWordNode, this.mWordOffset,
                                         this.mSpellSuggestions[index]);
  },

  // callback for enabling or disabling spellchecking
  toggleEnabled: function()
  {
    this.mInlineSpellChecker.enableRealTimeSpell =
        ! this.mInlineSpellChecker.enableRealTimeSpell;
  },

  // callback for adding the current misspelling to the user-defined dictionary
  addToDictionary: function()
  {
    this.mInlineSpellChecker.addWordToDictionary(this.mMisspelling);
  }
};