text: /* ***** BEGIN LICENSE BLOCK *****
   * Distributed under the BSD license:
   *
   * Copyright (c) 2010, Ajax.org B.V.
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *     * Redistributions of source code must retain the above copyright
   *       notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above copyright
   *       notice, this list of conditions and the following disclaimer in the
   *       documentation and/or other materials provided with the distribution.
   *     * Neither the name of Ajax.org B.V. nor the
   *       names of its contributors may be used to endorse or promote products
   *       derived from this software without specific prior written permission.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL AJAX.ORG B.V. BE LIABLE FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   * ***** END LICENSE BLOCK ***** */
  
  define(function(require, exports, module) {
  "use strict";
  
  var keyUtil  = require("../lib/keys");
  var event = require("../lib/event");
  
  var KeyBinding = function(editor) {
      this.$editor = editor;
      this.$data = { };
      this.$handlers = [];
      this.setDefaultHandler(editor.commands);
  };
  
  (function() {
      this.setDefaultHandler = function(kb) {
          this.removeKeyboardHandler(this.$defaultHandler);
          this.$defaultHandler = kb;
          this.addKeyboardHandler(kb, 0);
          this.$data = {editor: this.$editor};
      };
  
      this.setKeyboardHandler = function(kb) {
          var h = this.$handlers;
          if (h[h.length - 1] == kb)
              return;
  
          while (h[h.length - 1] && h[h.length - 1] != this.$defaultHandler)
              this.removeKeyboardHandler(h[h.length - 1]);
  
          this.addKeyboardHandler(kb, 1);
      };
  
      this.addKeyboardHandler = function(kb, pos) {
          if (!kb)
              return;
          var i = this.$handlers.indexOf(kb);
          if (i != -1)
              this.$handlers.splice(i, 1);
  
          if (pos == undefined)
              this.$handlers.push(kb);
          else
              this.$handlers.splice(pos, 0, kb);
  
          if (i == -1 && kb.attach)
              kb.attach(this.$editor);
      };
  
      this.removeKeyboardHandler = function(kb) {
          var i = this.$handlers.indexOf(kb);
          if (i == -1)
              return false;
          this.$handlers.splice(i, 1);
          kb.detach && kb.detach(this.$editor);
          return true;
      };
  
      this.getKeyboardHandler = function() {
          return this.$handlers[this.$handlers.length - 1];
      };
  
      this.$callKeyboardHandlers = function (hashId, keyString, keyCode, e) {
          var toExecute;
          var success = false;
          var commands = this.$editor.commands;
  
          for (var i = this.$handlers.length; i--;) {
              toExecute = this.$handlers[i].handleKeyboard(
                  this.$data, hashId, keyString, keyCode, e
              );
              if (!toExecute || !toExecute.command)
                  continue;
              
              // allow keyboardHandler to consume keys
              if (toExecute.command == "null") {
                  success = true;
              } else {
                  success = commands.exec(toExecute.command, this.$editor, toExecute.args, e);                
              }
              // do not stop input events to not break repeating
              if (success && e && hashId != -1 && 
                  toExecute.passEvent != true && toExecute.command.passEvent != true
              ) {
                  event.stopEvent(e);
              }
              if (success)
                  break;
          }
          return success;
      };
  
      this.onCommandKey = function(e, hashId, keyCode) {
          var keyString = keyUtil.keyCodeToString(keyCode);
          this.$callKeyboardHandlers(hashId, keyString, keyCode, e);
      };
  
      this.onTextInput = function(text) {
          var success = this.$callKeyboardHandlers(-1, text);
          if (!success)
              this.$editor.commands.exec("insertstring", this.$editor, text);
      };
  
  }).call(KeyBinding.prototype);
  
  exports.KeyBinding = KeyBinding;
  });
  