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File: Plugin.js
/**
 * Plugin.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2017 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

/**
 * This class contains all core logic for the code plugin.
 *
 * @class tinymce.tabfocus.Plugin
 * @private
 */
define(
  'tinymce.plugins.tabfocus.Plugin',
  [
    'tinymce.core.PluginManager',
    'tinymce.core.dom.DOMUtils',
    'tinymce.core.util.Tools',
    'tinymce.core.EditorManager',
    'tinymce.core.util.Delay',
    'tinymce.core.Env'
  ],
  function (PluginManager, DOMUtils, Tools, EditorManager, Delay, Env) {
    PluginManager.add('tabfocus', function (editor) {
      var DOM = DOMUtils.DOM;

      function tabCancel(e) {
        if (e.keyCode === 9 && !e.ctrlKey && !e.altKey && !e.metaKey) {
          e.preventDefault();
        }
      }

      function tabHandler(e) {
        var x, el, v, i;

        if (e.keyCode !== 9 || e.ctrlKey || e.altKey || e.metaKey || e.isDefaultPrevented()) {
          return;
        }

        function find(direction) {
          el = DOM.select(':input:enabled,*[tabindex]:not(iframe)');

          function canSelectRecursive(e) {
            return e.nodeName === "BODY" || (e.type != 'hidden' &&
              e.style.display != "none" &&
              e.style.visibility != "hidden" && canSelectRecursive(e.parentNode));
          }

          function canSelect(el) {
            return /INPUT|TEXTAREA|BUTTON/.test(el.tagName) && EditorManager.get(e.id) && el.tabIndex != -1 && canSelectRecursive(el);
          }

          Tools.each(el, function (e, i) {
            if (e.id == editor.id) {
              x = i;
              return false;
            }
          });
          if (direction > 0) {
            for (i = x + 1; i < el.length; i++) {
              if (canSelect(el[i])) {
                return el[i];
              }
            }
          } else {
            for (i = x - 1; i >= 0; i--) {
              if (canSelect(el[i])) {
                return el[i];
              }
            }
          }

          return null;
        }

        v = Tools.explode(editor.getParam('tab_focus', editor.getParam('tabfocus_elements', ':prev,:next')));

        if (v.length == 1) {
          v[1] = v[0];
          v[0] = ':prev';
        }

        // Find element to focus
        if (e.shiftKey) {
          if (v[0] == ':prev') {
            el = find(-1);
          } else {
            el = DOM.get(v[0]);
          }
        } else {
          if (v[1] == ':next') {
            el = find(1);
          } else {
            el = DOM.get(v[1]);
          }
        }

        if (el) {
          var focusEditor = EditorManager.get(el.id || el.name);

          if (el.id && focusEditor) {
            focusEditor.focus();
          } else {
            Delay.setTimeout(function () {
              if (!Env.webkit) {
                window.focus();
              }

              el.focus();
            }, 10);
          }

          e.preventDefault();
        }
      }

      editor.on('init', function () {
        if (editor.inline) {
          // Remove default tabIndex in inline mode
          DOM.setAttrib(editor.getBody(), 'tabIndex', null);
        }

        editor.on('keyup', tabCancel);

        if (Env.gecko) {
          editor.on('keypress keydown', tabHandler);
        } else {
          editor.on('keydown', tabHandler);
        }
      });
    });


    return function () { };
  }
);