**
 * @author Anton Glazatov (c) 03.2008
 * Scroll page button based on existing button idea
 * new implementation
 *
 * Left click - scroll slow down
 * Middle click - stop scroll
 * Right click - scroll slow up
 * Left double click - scroll fast down
 * Right double click - scroll fast up
 * Shift + Right click - Custom Buttons context menu
 */

function Scroller (oDocument)
{
    this. oDocument = oDocument;
    this. oDocument. defaultView. addEventListener ("keydown", this, false);
}
Scroller. prototype =
{
    oDocument: null,
    oTimer: null,
    
    _nSpeed: 1,
    _nDelay: 150,
    
    get _window ()
    {
        return this. oDocument. defaultView;
    },
    
    revertScroll: function ()
    {
        if (this. _nSpeed > 0)
            this. _nSpeed = -this. _nSpeed;
    },
    
    setSpeed: function (nSpeed)
    {
        this. _nSpeed = nSpeed;
    },
    
    setDelay: function (nDelay)
    {
        this. stopScroll ();
        this. _nDelay = nDelay;
    },
    
    scroll: function ()
    {
        var win = this. _window;
        if (((this. _nSpeed < 0) && (win. pageYOffset > 0)) ||
            ((this. _nSpeed > 0) && (win. pageYOffset < (this. oDocument. height - win. innerHeight))))
            this. _window. scrollBy (0, this. _nSpeed);
        else
            this. stopScroll ();
    },
    
    stopScroll: function ()
    {
        if (this. oTimer)
        {
            this. oTimer. cancel ();
            this. oTimer = null;
        }
    },
    
    startScroll: function ()
    {
        if (this. oTimer)
            this. stopTimer ();
        this. oTimer = Components. classes ["@mozilla.org/timer;1"].
                       createInstance (Components. interfaces. nsITimer);
        this. oTimer. initWithCallback (this, this. _nDelay, 1);            
    },
    
    QueryInterface: function (iid)
    {
        if (iid. equals (Components. interfaces. nsISupports) ||
            iid. equals (Components. interfaces. nsITimerCallback))
            return this;
        return Components. results. NS_ERROR_NO_INTERFACE;
    },
    
    notify: function (oTimer)
    {
        this. scroll ();
    },
    
    handleEvent: function (event)
    {
        this. stopScroll ();
    }
};

this. doScroll = function (oEvent)
{
    var scroller = this. getScroller ();
    if (oEvent. button == 1)
    {
        scroller. stopScroll ();
        return;
    }
    if (oEvent. button == 2)
        scroller. revertScroll ();
    scroller. startScroll ();
};

this. scrollPage = function (evt)
{
    var scroller = this. getScroller ();
    scroller. setSpeed (1);
    scroller. setDelay (150);
    if (evt. button == 2 && evt. shiftKey)
        this. showPopup (this);
    else
        this. doScroll (evt);
};
this. scrollPageFast = function (evt)
{
    var scroller = this. getScroller ();
    scroller. setSpeed (10);
    scroller. setDelay (50);
    this. doScroll (evt);
};
this. getScroller = function ()
{
    var ct = getBrowser (). selectedTab;
    if (!ct. cbScrollButton)
        ct. cbScrollButton = new Scroller (getBrowser (). contentDocument);
    return ct. cbScrollButton;
};

this. showPopup = function (node)
{
    var popup = document. getElementById ("custombuttons-contextpopup");
    var x = node. boxObject. x;
    var y = node. boxObject. y + node. boxObject. height;
    document. popupNode = node;
    popup. showPopup (node, x, y, "popup", null, null);
}
this. setAttribute ("onclick", "this.scrollPage(event);");
this. setAttribute ("ondblclick","this.scrollPageFast(event)");
this. setAttribute ("context", "");
this. tooltipText = 'Down/Menu/Up ~ Fast Down//Fast Up';

// Новый пункт 'Догрузка не загруженных картинок' в контекстное меню страницы.......................................
(function() {
  // Стоп, если функция уже выполнялась..........
   if (document.getElementById("context-reloadAllimage")) return;
   
   // Функция перезагружает все изображение на странице..........
   reloadImage = function(event){ 
   function reloadImage(img) {
   if(!(img instanceof Components.interfaces.nsIImageLoadingContent) || !img.currentURI)
        return;
   urlSecurityCheck(img.currentURI.spec,
                     gBrowser.contentPrincipal,
                     Components.interfaces.nsIScriptSecurityManager.DISALLOW_SCRIPT);
   img.forceReload();
   }
   function parseWin(win) {
    Array.forEach(win.frames, parseWin);
    Array.forEach(win.document.images, reloadImage);
    }
   parseWin(content);
   };
   
   // Создаем новый пункт контекстного меню..........
   var menuitem = document.createElement("menuitem");
   menuitem.setAttribute("id", "context-reloadAllimage");
   menuitem.setAttribute("oncommand", "reloadImage(event)");
   menuitem.setAttribute("label", "Догрузка не загруженных картинок");

   // Установить положение нового пункта относительно других пунктов меню
   var selectall = document.getElementById("context-viewbgimage");
   if (!selectall) return;
   selectall.parentNode.insertBefore(menuitem, selectall);
   
   // Устанавливаем где показывать новый пункт меню..........
   document.getElementById("contentAreaContextMenu").addEventListener("popupshowing", function(e) {
   if (e.target != this) return;
   if (gContextMenu) 
      // когда не показывать
      falseItem = gContextMenu.isTextSelected || gContextMenu.onLink || gContextMenu.onImage || gContextMenu.onTextInput;
      gContextMenu.showItem("context-toggleGif", !falseItem);
   }, false);
})();

/*Initialization Code*///Memory Monitor..................
var ucjs_MemoryMonitor = {

  _interval: 2000, //ms
  _maxMemory: 1500,
  _prefix: "MB", //B, KB, MB, GB
  _dPrefix: true,
  
  interval: null,
  init: function () {
  
    var memoryPanel = document.createElement("statusbarpanel");
    memoryPanel.id = "MemoryDisplay";
    memoryPanel.setAttribute("label", this.setPrefix(this._dPrefix));
    var urlbar = document.getElementById("urlbar-icons");
    var go = urlbar.lastChild;
    urlbar.insertBefore(memoryPanel, go)
    this.start();
    this.interval = setInterval(this.start, this._interval);
  },

  addFigure: function (str) {
    var num = new String(str).replace(/,/g, "");
    while (num != (num = num.replace(/^(-?\d+)(\d{3})/, "$1,$2")));
    return num;
  },

  restart: function () {
    var appStartup = Components.interfaces.nsIAppStartup;
    Components.classes["@mozilla.org/toolkit/app-startup;1"].getService(appStartup).quit(appStartup.eRestart | appStartup.eAttemptQuit);
  },

  getSize: function (mem, flag) {
    var pre = 1;
    switch (this._prefix) {
      case 'KB':
        pre = 1024;
        break;
      case 'MB':
        pre = 1024 * 1024;
        break;
      case 'GB':
        pre = 1024 * 1024 * 1024;
        break;
    }
    if (flag) return mem * pre;
    else return ucjs_MemoryMonitor.addFigure(Math.round(mem / pre));
  },

  setPrefix: function (flag) {
    return (flag) ? " " + this._prefix : "";
  },

  start: function () {
    try {
      const Cc = Components.classes;
      const Ci = Components.interfaces;
      var mgr = Cc["@mozilla.org/memory-reporter-manager;1"].getService(Ci.nsIMemoryReporterManager);
      var e = mgr.enumerateReporters();
      var gMemReporters = {};
      while (e.hasMoreElements()) {
        var mr = e.getNext().QueryInterface(Ci.nsIMemoryReporter);
        gMemReporters[mr.path] = mr;
      }
      var workingSet = gMemReporters["resident"].amount;
      var commitmentSize = gMemReporters["private"].amount;
      var gfxImage = gMemReporters["gfx-surface-image"].amount;
      var restartMemory = ucjs_MemoryMonitor.getSize(ucjs_MemoryMonitor._maxMemory, true);
      var memoryPanel = document.getElementById("MemoryDisplay");
      memoryPanel.setAttribute("label", ucjs_MemoryMonitor.getSize(workingSet) + ucjs_MemoryMonitor.setPrefix(ucjs_MemoryMonitor._dPrefix));
      memoryPanel.style.borderBottom = "0px";
memoryPanel.style.borderTop = "0px";
if (workingSet > restartMemory) {
        ucjs_MemoryMonitor.restart();
      }
    } catch (e) {
      clearInterval(ucjs_MemoryMonitor.interval);
    }
  }
}
//Запускаем функцию
// выходим, если функция уже выполнялась
if (!document.getElementById("MemoryDisplay")) ucjs_MemoryMonitor.init();

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