pjs/editor/ui/composer/content/editorApplicationOverlay.js

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/* Implementations of nsIControllerCommand for composer commands */

function initEditorContextMenuItems(aEvent)
{
  var shouldShowEditPage = !gContextMenu.onImage && !gContextMenu.onLink && !gContextMenu.onTextInput && !gContextMenu.inDirList;
  gContextMenu.showItem( "context-editpage", shouldShowEditPage );

  var shouldShowEditLink = gContextMenu.onSaveableLink; 
  gContextMenu.showItem( "context-editlink", shouldShowEditLink );

  // Hide the applications separator if there's no add-on apps present. 
  gContextMenu.showItem("context-sep-apps", gContextMenu.shouldShowSeparator("context-sep-apps"));
}
  
function initEditorContextMenuListener(aEvent)
{
  var popup = document.getElementById("contentAreaContextMenu");
  if (popup)
    popup.addEventListener("popupshowing", initEditorContextMenuItems, false);
}

addEventListener("load", initEditorContextMenuListener, false);

function editLink(aLinkURL)
{
  urlSecurityCheck(aLinkURL, window.document);  // XXX what is this? Why do we pass the chrome doc?
  editPage(aLinkURL, window, false);
}

function editDocument(aDocument)      
{
  if (!aDocument)
    aDocument = window._content.document;

  editPage(aDocument.URL, window, false); 
}

function editPageOrFrame()
{
  var url;
  var focusedWindow = document.commandDispatcher.focusedWindow;
  if (isDocumentFrame(focusedWindow))
    url = focusedWindow.location.href;
  else
    url = window._content.location.href;

  editPage(url, window, false)
}

// Any non-editor window wanting to create an editor with a URL
//   should use this instead of "window.openDialog..."
//  We must always find an existing window with requested URL
// (When calling from a dialog, "launchWindow" is dialog's "opener"
//   and we need a delay to let dialog close)
function editPage(url, launchWindow, delay)
{
  var focusedWindow = document.commandDispatcher.focusedWindow;
  if (isDocumentFrame(focusedWindow))
    url = focusedWindow.location.href;

  // User may not have supplied a window
  if (!launchWindow)
  {
    if (window)
    {
      launchWindow = window;
    }
    else
    {
      dump("No window to launch an editor from!\n");
      return;
    }
  }

  // if the current window is a browser window, then extract the current charset menu setting from the current 
  // document and use it to initialize the new composer window...

  var wintype = document.firstChild.getAttribute('windowtype');
  var charsetArg;

  if (launchWindow && (wintype == "navigator:browser") && launchWindow._content.document)
    charsetArg = "charset=" + launchWindow._content.document.characterSet;

  try {
    var uri = createURI(url, null, null);

    var windowManager = Components.classes['@mozilla.org/appshell/window-mediator;1'].getService();
    var windowManagerInterface = windowManager.QueryInterface( Components.interfaces.nsIWindowMediator);
    var enumerator = windowManagerInterface.getEnumerator( "composer:html" );
    var emptyWindow;
    while ( enumerator.hasMoreElements() )
    {
      var win = enumerator.getNext().QueryInterface(Components.interfaces.nsIDOMWindowInternal);
      if ( win && win.editorShell)
      {
        if (CheckOpenWindowForURIMatch(uri, win))
        {
          // We found an editor with our url
          win.focus();
          return;
        }
        else if (!emptyWindow && win.PageIsEmptyAndUntouched())
        {
          emptyWindow = win;
        }
      }
    }

    if (emptyWindow)
    {
      // we have an empty window we can use
      if (emptyWindow.IsInHTMLSourceMode())
        emptyWindow.FinishHTMLSource();
      emptyWindow.editorShell.LoadUrl(url);
      emptyWindow.focus();
      emptyWindow.SetSaveAndPublishUI(url);
      return;
    }

    // Create new Composer window
    if (delay)
    {
      launchWindow.delayedOpenWindow("chrome://editor/content", "chrome,all,dialog=no", url);
    }
    else
      launchWindow.openDialog("chrome://editor/content", "_blank", "chrome,all,dialog=no", url, charsetArg);

  } catch(e) {}
}

function createURI(urlstring)
{
  try {
    var ioserv = Components.classes["@mozilla.org/network/io-service;1"]
               .getService(Components.interfaces.nsIIOService);
    return ioserv.newURI(urlstring, null, null);
  } catch (e) {}

  return null;
}

function CheckOpenWindowForURIMatch(uri, win)
{
  try {
    var contentWindow = win.content;  // need to QI win to nsIDOMWindowInternal?
    var contentDoc = contentWindow.document;
    var htmlDoc = contentDoc.QueryInterface(Components.interfaces.nsIDOMHTMLDocument);
    var winuri = createURI(htmlDoc.URL);
    return winuri.equals(uri);
  } catch (e) {}
  
  return false;
}

function NewEditorFromTemplate()
{
  // XXX not implemented
}

function NewEditorFromDraft()
{
  // XXX not implemented
}