nscontextmenu.js

现在很火的邮件客户端软件thunderbird的源码

          reference = focusedWindow.getSelection();
        else if (context == "mathml")
          reference = this.target;
        else
          throw "not reached";

        var docUrl = null; // unused (and play nice for fragments generated via XSLT too)
        window.openDialog("chrome://navigator/content/viewPartialSource.xul",
                          "_blank", "scrollbars,resizable,chrome,dialog=no",
                          docUrl, docCharset, reference, context);
    },
    // Open new "view source" window with the frame's URL.
    viewFrameSource : function () {
        BrowserViewSourceOfDocument(this.target.ownerDocument);
    },
    viewInfo : function () {
        BrowserPageInfo();
    },
    viewFrameInfo : function () {
        BrowserPageInfo(this.target.ownerDocument);
    },
    toggleImageSize : function () {
        _content.document.toggleImageSize();
    },
    // Change current window to the URL of the image.
    viewImage : function () {
        // we don't really want to open the url in a top level window because we don't have a 
        // browser window...for now do nothing
    },
    // Change current window to the URL of the background image.
    viewBGImage : function () {
        openTopWin( this.bgImageURL );
    },
    setWallpaper: function() {
      var winhooks = Components.classes[ "@mozilla.org/winhooks;1" ].
                       getService(Components.interfaces.nsIWindowsHooks);
      
      winhooks.setImageAsWallpaper(this.target, false);
    },    
    // Save URL of clicked-on frame.
    saveFrame : function () {
        saveDocument( this.target.ownerDocument );
    },
    // Save URL of clicked-on link.
    saveLink : function () {
        saveURL( this.linkURL(), this.linkText(), null, true );
    },
    // Save URL of clicked-on image.
    saveImage : function () {
        saveURL( this.imageURL, null, "SaveImageTitle", false );
    },
    // Generate email address and put it on clipboard.
    copyEmail : function () {
        // Copy the comma-separated list of email addresses only.
        // There are other ways of embedding email addresses in a mailto:
        // link, but such complex parsing is beyond us.
        
        const kMailToLength = 7; // length of "mailto:"

        var url = this.linkURL();
        var qmark = url.indexOf( "?" );
        var addresses;
        
        if ( qmark > kMailToLength ) {
            addresses = url.substring( kMailToLength, qmark );
        } else {
            addresses = url.substr( kMailToLength );
        }

        // Let's try to unescape it using a character set
        try {
          var ownerDocument = new XPCNativeWrapper(this.target, "ownerDocument").ownerDocument;
          var characterSet = new XPCNativeWrapper(ownerDocument, "characterSet").characterSet;
          const textToSubURI = Components.classes["@mozilla.org/intl/texttosuburi;1"]
                                         .getService(Components.interfaces.nsITextToSubURI);
          addresses = textToSubURI.unEscapeURIForUI(characterSet, addresses);
        }
        catch(ex) {
          // Do nothing.
        }

        var clipboard = this.getService( "@mozilla.org/widget/clipboardhelper;1",
                                         Components.interfaces.nsIClipboardHelper );
        clipboard.copyString(addresses);
    },    

    ///////////////
    // Utilities //
    ///////////////

    // Create instance of component given contractId and iid (as string).
    createInstance : function ( contractId, iidName ) {
        var iid = Components.interfaces[ iidName ];
        return Components.classes[ contractId ].createInstance( iid );
    },
    // Get service given contractId and iid (as string).
    getService : function ( contractId, iidName ) {
        var iid = Components.interfaces[ iidName ];
        return Components.classes[ contractId ].getService( iid );
    },
    // Show/hide one item (specified via name or the item element itself).
    showItem : function ( itemOrId, show ) {
        var item = itemOrId.constructor == String ? document.getElementById(itemOrId) : itemOrId;
        if (item) 
          item.hidden = !show;
    },
    // Set given attribute of specified context-menu item.  If the
    // value is null, then it removes the attribute (which works
    // nicely for the disabled attribute).
    setItemAttr : function ( id, attr, val ) {
        var elem = document.getElementById( id );
        if ( elem ) {
            if ( val == null ) {
                // null indicates attr should be removed.
                elem.removeAttribute( attr );
            } else {
                // Set attr=val.
                elem.setAttribute( attr, val );
            }
        }
    },
    // Set context menu attribute according to like attribute of another node
    // (such as a broadcaster).
    setItemAttrFromNode : function ( item_id, attr, other_id ) {
        var elem = document.getElementById( other_id );
        if ( elem && elem.getAttribute( attr ) == "true" ) {
            this.setItemAttr( item_id, attr, "true" );
        } else {
            this.setItemAttr( item_id, attr, null );
        }
    },
    // Temporary workaround for DOM api not yet implemented by XUL nodes.
    cloneNode : function ( item ) {
        // Create another element like the one we're cloning.
        var node = document.createElement( item.tagName );

        // Copy attributes from argument item to the new one.
        var attrs = item.attributes;
        for ( var i = 0; i < attrs.length; i++ ) {
            var attr = attrs.item( i );
            node.setAttribute( attr.nodeName, attr.nodeValue );
        }

        // Voila!
        return node;
    },
    // Generate fully-qualified URL for clicked-on link.
    linkURL : function () {
        if (this.link.href) {
          return this.link.href;
        }
        var href = this.link.getAttributeNS("http://www.w3.org/1999/xlink","href");
        if (!href || !href.match(/\S/)) {
          throw "Empty href"; // Without this we try to save as the current doc, for example, HTML case also throws if empty
        }
        href = this.makeURLAbsolute(this.link.baseURI,href);
        return href;
    },
    // Get text of link.
    linkText : function () {
        var text = gatherTextUnder( this.link );
        if (!text || !text.match(/\S/)) {
          text = this.link.getAttribute("title");
          if (!text || !text.match(/\S/)) {
            text = this.link.getAttribute("alt");
            if (!text || !text.match(/\S/)) {
              if (this.link.href) {                
                text = this.link.href;
              } else {
                text = getAttributeNS("http://www.w3.org/1999/xlink", "href");
                if (text && text.match(/\S/)) {
                  text = this.makeURLAbsolute(this.link.baseURI, text);
                }
              }
            }
          }
        }

        return text;
    },

    //Get selected object and convert it to a string to get
    //selected text.   Only use the first 15 chars.
    isTextSelection : function() {
        var result = false;
        var selection = this.searchSelected();

        var bundle = srGetStrBundle("chrome://communicator/locale/contentAreaCommands.properties");

        var searchSelectText;
        if (selection != "") {
            searchSelectText = selection.toString();
            if (searchSelectText.length > 15)
                searchSelectText = searchSelectText.substr(0,15) + "...";
            result = true;

          // format "Search for <selection>" string to show in menu
          searchSelectText = bundle.formatStringFromName("searchText",
                                                         [searchSelectText], 1);
          this.setItemAttr("context-searchselect", "label", searchSelectText);
        } 
        return result;
    },
    
    searchSelected : function() {
        var focusedWindow = document.commandDispatcher.focusedWindow;
        var searchStr = focusedWindow.getSelection();;
        searchStr = searchStr.toString();
        searchStr = searchStr.replace( /^\s+/, "" );
        searchStr = searchStr.replace(/(\n|\r|\t)+/g, " ");
        searchStr = searchStr.replace(/\s+$/,"");
        return searchStr;
    },
    
    // Convert relative URL to absolute, using document's <base>.
    makeURLAbsolute : function ( base, url ) {
        // Construct nsIURL.
        var ioService = Components.classes["@mozilla.org/network/io-service;1"]
                      .getService(Components.interfaces.nsIIOService);
        var baseURI  = ioService.newURI(base, null, null);
        
        return ioService.newURI(baseURI.resolve(url), null, null).spec;
    },

    toString : function () {
        return "contextMenu.target     = " + this.target + "\n" +
               "contextMenu.onImage    = " + this.onImage + "\n" +
               "contextMenu.onLink     = " + this.onLink + "\n" +
               "contextMenu.link       = " + this.link + "\n" +
               "contextMenu.inFrame    = " + this.inFrame + "\n" +
               "contextMenu.hasBGImage = " + this.hasBGImage + "\n";
    },
    isTargetATextBox : function ( node )
    {
      if (node instanceof HTMLInputElement)
        return (node.type == "text" || node.type == "password")

      return (node instanceof HTMLTextAreaElement);
    },

    // Determines whether or not the separator with the specified ID should be 
    // shown or not by determining if there are any non-hidden items between it
    // and the previous separator. 
    shouldShowSeparator : function ( aSeparatorID )
    {
      var separator = document.getElementById(aSeparatorID);
      if (separator) {
        var sibling = separator.previousSibling;
        while (sibling && sibling.localName != "menuseparator") {
          if (sibling.getAttribute("hidden") != "true")
            return true;
          sibling = sibling.previousSibling;
        }
      }
      return false;  
    }
};