/**
 * Copyright (c) Tiny Technologies, Inc. All rights reserved.
 * Licensed under the LGPL or a commercial license.
 * For LGPL see License.txt in the project root for license information.
 * For commercial licenses see https://www.tiny.cloud/
 *
 * Version: 5.3.0 (2020-05-21)
 */
(function (domGlobals) {
    'use strict';

    var global = tinymce.util.Tools.resolve('tinymce.PluginManager');

    var global$1 = tinymce.util.Tools.resolve('tinymce.dom.DOMUtils');

    var global$2 = tinymce.util.Tools.resolve('tinymce.EditorManager');

    var global$3 = tinymce.util.Tools.resolve('tinymce.Env');

    var global$4 = tinymce.util.Tools.resolve('tinymce.util.Delay');

    var global$5 = tinymce.util.Tools.resolve('tinymce.util.Tools');

    var global$6 = tinymce.util.Tools.resolve('tinymce.util.VK');

    var getTabFocusElements = function (editor) {
      return editor.getParam('tabfocus_elements', ':prev,:next');
    };
    var getTabFocus = function (editor) {
      return editor.getParam('tab_focus', getTabFocusElements(editor));
    };

    var DOM = global$1.DOM;
    var tabCancel = function (e) {
      if (e.keyCode === global$6.TAB && !e.ctrlKey && !e.altKey && !e.metaKey) {
        e.preventDefault();
      }
    };
    var setup = function (editor) {
      function tabHandler(e) {
        var x, el, v, i;
        if (e.keyCode !== global$6.TAB || 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) && global$2.get(e.id) && el.tabIndex !== -1 && canSelectRecursive(el);
          }
          global$5.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 = global$5.explode(getTabFocus(editor));
        if (v.length === 1) {
          v[1] = v[0];
          v[0] = ':prev';
        }
        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 = global$2.get(el.id || el.name);
          if (el.id && focusEditor) {
            focusEditor.focus();
          } else {
            global$4.setTimeout(function () {
              if (!global$3.webkit) {
                domGlobals.window.focus();
              }
              el.focus();
            }, 10);
          }
          e.preventDefault();
        }
      }
      editor.on('init', function () {
        if (editor.inline) {
          DOM.setAttrib(editor.getBody(), 'tabIndex', null);
        }
        editor.on('keyup', tabCancel);
        if (global$3.gecko) {
          editor.on('keypress keydown', tabHandler);
        } else {
          editor.on('keydown', tabHandler);
        }
      });
    };

    function Plugin () {
      global.add('tabfocus', function (editor) {
        setup(editor);
      });
    }

    Plugin();

}(window));
