/*************************************************************

*
*  MathJax/extensions/HelpDialog.js
*  
*  Implements the MathJax Help dialog box.
*
*  ---------------------------------------------------------------------
*  
*  Copyright (c) 2013-2018 The MathJax Consortium
* 
*  Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
* 
*  Unless required by applicable law or agreed to in writing, software
*  distributed under the License is distributed on an "AS IS" BASIS,
*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*  See the License for the specific language governing permissions and
*  limitations under the License.
*/

(function (HUB,HTML,AJAX,OUTPUT,LOCALE) {

var HELP = MathJax.Extension.Help = {
  version: "2.7.5"
};

var STIXURL = "http://www.stixfonts.org/";
var MENU = MathJax.Menu;
var FALSE, KEY;
HUB.Register.StartupHook("MathEvents Ready",function () {
  FALSE = MathJax.Extension.MathEvents.Event.False;
  KEY = MathJax.Extension.MathEvents.Event.KEY;
});

var CONFIG = HUB.CombineConfig("HelpDialog",{

  styles: {
    "#MathJax_Help": {
      position:"fixed", left:"50%", width:"auto", "max-width": "90%", "text-align":"center",
      border:"3px outset", padding:"1em 2em", "background-color":"#DDDDDD", color:"black",
      cursor: "default", "font-family":"message-box", "font-size":"120%",
      "font-style":"normal", "text-indent":0, "text-transform":"none",
      "line-height":"normal", "letter-spacing":"normal", "word-spacing":"normal",
      "word-wrap":"normal", "white-space":"wrap", "float":"none", "z-index":201,

      "border-radius": "15px",                     // Opera 10.5 and IE9
      "-webkit-border-radius": "15px",             // Safari and Chrome
      "-moz-border-radius": "15px",                // Firefox
      "-khtml-border-radius": "15px",              // Konqueror

      "box-shadow":"0px 10px 20px #808080",         // Opera 10.5 and IE9
      "-webkit-box-shadow":"0px 10px 20px #808080", // Safari 3 and Chrome
      "-moz-box-shadow":"0px 10px 20px #808080",    // Forefox 3.5
      "-khtml-box-shadow":"0px 10px 20px #808080",  // Konqueror
      filter: "progid:DXImageTransform.Microsoft.dropshadow(OffX=2, OffY=2, Color='gray', Positive='true')" // IE
    },
    "#MathJax_Help.MathJax_MousePost": {
      outline:"none"
    },

    "#MathJax_HelpContent": {
      overflow:"auto", "text-align":"left", "font-size":"80%",
      padding:".4em .6em", border:"1px inset", margin:"1em 0px",
      "max-height":"20em", "max-width":"30em", "background-color":"#EEEEEE"
    },

    "#MathJax_HelpClose": {
      position:"absolute", top:".2em", right:".2em",
      cursor:"pointer",
      display:"inline-block",
      border:"2px solid #AAA",
      "border-radius":"18px",
      "-webkit-border-radius": "18px",             // Safari and Chrome
      "-moz-border-radius": "18px",                // Firefox
      "-khtml-border-radius": "18px",              // Konqueror
      "font-family":"'Courier New',Courier",
      "font-size":"24px",
      color:"#F0F0F0"
    },
    "#MathJax_HelpClose span": {
      display:"block", "background-color":"#AAA", border:"1.5px solid",
      "border-radius":"18px",
      "-webkit-border-radius": "18px",             // Safari and Chrome
      "-moz-border-radius": "18px",                // Firefox
      "-khtml-border-radius": "18px",              // Konqueror
      "line-height":0, 
      padding:"8px 0 6px"     // may need to be browser-specific
    },
    "#MathJax_HelpClose:hover": {
      color:"white!important",
      border:"2px solid #CCC!important"
    },
    "#MathJax_HelpClose:hover span": {
      "background-color":"#CCC!important"
    },
    "#MathJax_HelpClose:hover:focus": {
      outline:"none"
    }
  }
});

/*
 *  Handle the Help Dialog box
 */
HELP.Dialog = function (event) {
  LOCALE.loadDomain("HelpDialog",["Post",HELP,event]);
};

HELP.Post = function (event) {
  this.div = MENU.Background(this);
  var help = HTML.addElement(this.div,"div",{
    id: "MathJax_Help", tabIndex: 0, onkeydown: HELP.Keydown
  },LOCALE._("HelpDialog",[
    ["b",{style:{fontSize:"120%"}},[["Help","MathJax Help"]]],
    ["div",{id: "MathJax_HelpContent", tabIndex: 0},[
      ["p",{},[["MathJax",
        "*MathJax* is a JavaScript library that allows page authors to include " +
        "mathematics within their web pages.  As a reader, you don't need to do " +
        "anything to make that happen."]]
      ],
      ["p",{},[["Browsers",
        "*Browsers*: MathJax works with all modern browsers including IE6+, Firefox 3+, " +
        "Chrome 0.2+, Safari 2+, Opera 9.6+ and most mobile browsers."]]
      ],
      ["p",{},[["Menu",
        "*Math Menu*: MathJax adds a contextual menu to equations.  Right-click or " +
        "CTRL-click on any mathematics to access the menu."]]
      ],
      ["div",{style:{"margin-left":"1em"}},[
        ["p",{},[["ShowMath",
          "*Show Math As* allows you to view the formula's source markup " +
          "for copy & paste (as MathML or in its original format)."]]
        ],
        ["p",{},[["Settings",
          "*Settings* gives you control over features of MathJax, such as the " +
          "size of the mathematics, and the mechanism used to display equations."]]
        ],
        ["p",{},[["Language",
          "*Language* lets you select the language used by MathJax for its menus " +
          "and warning messages."]]
        ],
      ]],
      ["p",{},[["Zoom",
        "*Math Zoom*: If you are having difficulty reading an equation, MathJax can " +
        "enlarge it to help you see it better."]]
      ],
      ["p",{},[["Accessibilty",
        "*Accessibility*: MathJax will automatically work with screen readers to make " +
        "mathematics accessible to the visually impaired."]]
      ],
      ["p",{},[["Fonts",
        "*Fonts*: MathJax will use certain math fonts if they are installed on your " +
        "computer; otherwise, it will use web-based fonts.  Although not required, " +
        "locally installed fonts will speed up typesetting.  We suggest installing " +
        "the [STIX fonts](%1).",STIXURL]]
      ]
    ]],
    ["a",{href:"http://www.mathjax.org/"},["www.mathjax.org"]],
    ["span",{id: "MathJax_HelpClose", onclick: HELP.Remove,
             onkeydown: HELP.Keydown, tabIndex: 0, role: "button",
             "aria-label": LOCALE._(["HelpDialog","CloseDialog"],"Close help dialog")},
      [["span",{},["\u00D7"]]]
    ]
  ]));
  if (event.type === "mouseup") help.className += " MathJax_MousePost";
  help.focus();
  LOCALE.setCSS(help);
  var doc = (document.documentElement||{});
  var H = window.innerHeight || doc.clientHeight || doc.scrollHeight || 0;
  if (MENU.prototype.msieAboutBug) {
    help.style.width = "20em"; help.style.position = "absolute";
    help.style.left = Math.floor((document.documentElement.scrollWidth - help.offsetWidth)/2)+"px";
    help.style.top = (Math.floor((H-help.offsetHeight)/3)+document.body.scrollTop)+"px";
  } else {
    help.style.marginLeft = Math.floor(-help.offsetWidth/2)+"px";
    help.style.top = Math.floor((H-help.offsetHeight)/3)+"px";
  }
};
HELP.Remove = function (event) {
  if (HELP.div) {document.body.removeChild(HELP.div); delete HELP.div}
};
HELP.Keydown = function(event) {
  if (event.keyCode === KEY.ESCAPE ||
      (this.id === "MathJax_HelpClose" &&
       (event.keyCode === KEY.SPACE || event.keyCode === KEY.RETURN))) {
    HELP.Remove(event);
    MENU.CurrentNode().focus();
    FALSE(event);
  }
},

MathJax.Callback.Queue(
  HUB.Register.StartupHook("End Config",{}), // wait until config is complete
  ["Styles",AJAX,CONFIG.styles],
  ["Post",HUB.Startup.signal,"HelpDialog Ready"],
  ["loadComplete",AJAX,"[MathJax]/extensions/HelpDialog.js"]
);

})(MathJax.Hub,MathJax.HTML,MathJax.Ajax,MathJax.OutputJax,MathJax.Localization);