📄 nscontextmenu.js

📁 现在很火的邮件客户端软件thunderbird的源码
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        // See if the user clicked on an image.        if ( this.target.nodeType == Node.ELEMENT_NODE ) {            if ( this.target instanceof Components.interfaces.nsIImageLoadingContent && this.target.currentURI  ) {                this.onImage = true;                var request = this.target.getRequest( Components.interfaces.nsIImageLoadingContent.CURRENT_REQUEST );                if (request && (request.imageStatus & request.STATUS_SIZE_AVAILABLE))                    this.onLoadedImage = true;                this.imageURL = this.target.currentURI.spec;                if ( this.target.ownerDocument instanceof ImageDocument )                   this.onStandaloneImage = true;            } else if ( this.target instanceof HTMLInputElement) {               type = this.target.getAttribute("type");               this.onTextInput = this.isTargetATextBox(this.target);            } else if ( this.target instanceof HTMLTextAreaElement ) {                 this.onTextInput = true;            } else if ( this.target instanceof HTMLHtmlElement ) {               // pages with multiple <body>s are lame. we'll teach them a lesson.               var bodyElt = this.target.ownerDocument.getElementsByTagName("body")[0];               if ( bodyElt ) {                 var computedURL = this.getComputedURL( bodyElt, "background-image" );                 if ( computedURL ) {                   this.hasBGImage = true;                   this.bgImageURL = this.makeURLAbsolute( bodyElt.baseURI,                                                           computedURL );                 }               }            } else if ( "HTTPIndex" in _content &&                        _content.HTTPIndex instanceof Components.interfaces.nsIHTTPIndex ) {                this.inDirList = true;                // Bubble outward till we get to an element with URL attribute                // (which should be the href).                var root = this.target;                while ( root && !this.link ) {                    if ( root.tagName == "tree" ) {                        // Hit root of tree; must have clicked in empty space;                        // thus, no link.                        break;                    }                    if ( root.getAttribute( "URL" ) ) {                        // Build pseudo link object so link-related functions work.                        this.onLink = true;                        this.link = { href : root.getAttribute("URL"),                                      getAttribute: function (attr) {                                          if (attr == "title") {                                              return root.firstChild.firstChild.getAttribute("label");                                          } else {                                              return "";                                          }                                      }                                    };                        // If element is a directory, then you can't save it.                        if ( root.getAttribute( "container" ) == "true" ) {                            this.onSaveableLink = false;                        } else {                            this.onSaveableLink = true;                        }                    } else {                        root = root.parentNode;                    }                }            }        }        // We have meta data on images.        this.onMetaDataItem = this.onImage;                // See if the user clicked on MathML        const NS_MathML = "http://www.w3.org/1998/Math/MathML";        if ((this.target.nodeType == Node.TEXT_NODE &&             this.target.parentNode.namespaceURI == NS_MathML)             || (this.target.namespaceURI == NS_MathML))          this.onMathML = true;        // See if the user clicked in a frame.        if ( this.target.ownerDocument != window._content.document ) {            this.inFrame = true;        }                // Bubble out, looking for items of interest        var elem = this.target;        while ( elem ) {            if ( elem.nodeType == Node.ELEMENT_NODE ) {                // Link?                if ( !this.onLink &&                     ( (elem instanceof HTMLAnchorElement && elem.href) ||                      elem instanceof HTMLAreaElement ||                      elem instanceof HTMLLinkElement ||                      elem.getAttributeNS( "http://www.w3.org/1999/xlink", "type") == "simple" ) ) {                    // Clicked on a link.                    this.onLink = true;                    this.onMetaDataItem = true;                    // Remember corresponding element.                    this.link = elem;                    this.onMailtoLink = this.isLinkType( "mailto:", this.link );                    // Remember if it is saveable.                    this.onSaveableLink = this.isLinkSaveable( this.link );                }                                // Text input?                if ( !this.onTextInput ) {                    // Clicked on a link.                    this.onTextInput = this.isTargetATextBox(elem);                }                                // Metadata item?                if ( !this.onMetaDataItem ) {                    // We currently display metadata on anything which fits                    // the below test.                    if ( ( elem instanceof HTMLQuoteElement && elem.cite)    ||                         ( elem instanceof HTMLTableElement && elem.summary) ||                         ( elem instanceof HTMLModElement &&                             ( elem.cite || elem.dateTime ) )                ||                         ( elem instanceof HTMLElement &&                             ( elem.title || elem.lang ) ) ) {                        this.onMetaDataItem = true;                    }                }                // Background image?  Don't bother if we've already found a                 // background image further down the hierarchy.  Otherwise,                // we look for the computed background-image style.                if ( !this.hasBGImage ) {                    var bgImgUrl = this.getComputedURL( elem, "background-image" );                    if ( bgImgUrl ) {                        this.hasBGImage = true;                        this.bgImageURL = this.makeURLAbsolute( elem.baseURI,                                                                bgImgUrl );                    }                }            }            elem = elem.parentNode;            }    },    initPopupURL: function() {      // quick check: if no opener, it can't be a popup      if (!window.content.opener)        return;      try {        var show = false;        // is it a popup window?        const CI = Components.interfaces;        var xulwin = window                    .QueryInterface(CI.nsIInterfaceRequestor)                    .getInterface(CI.nsIWebNavigation)                    .QueryInterface(CI.nsIDocShellTreeItem)                    .treeOwner                    .QueryInterface(CI.nsIInterfaceRequestor)                    .getInterface(CI.nsIXULWindow);        if (xulwin.contextFlags &            CI.nsIWindowCreator2.PARENT_IS_LOADING_OR_RUNNING_TIMEOUT) {          // do the pref settings allow site-by-site popup management?          const PB = Components.classes["@mozilla.org/preferences-service;1"]                     .getService(CI.nsIPrefBranch);          show = !PB.getBoolPref("dom.disable_open_during_load");        }        if (show) {          // initialize popupURL          const IOS = Components.classes["@mozilla.org/network/io-service;1"]                      .getService(CI.nsIIOService);          var spec = Components.lookupMethod(window.content.opener, "location")                     .call();          this.popupURL = IOS.newURI(spec, null, null);          // but cancel if it's an unsuitable URL          const PM = Components.classes["@mozilla.org/PopupWindowManager;1"]                     .getService(CI.nsIPopupWindowManager);        }      } catch(e) {      }    },    // Returns the computed style attribute for the given element.    getComputedStyle: function( elem, prop ) {         return elem.ownerDocument.defaultView.getComputedStyle( elem, '' ).getPropertyValue( prop );    },    // Returns a "url"-type computed style attribute value, with the url() stripped.    getComputedURL: function( elem, prop ) {         var url = elem.ownerDocument.defaultView.getComputedStyle( elem, '' ).getPropertyCSSValue( prop );         return ( url.primitiveType == CSSPrimitiveValue.CSS_URI ) ? url.getStringValue() : null;    },    // Returns true iff clicked on link is saveable.    isLinkSaveable : function ( link ) {        // We don't do the Right Thing for news/snews yet, so turn them off        // until we do.        return !(this.isLinkType( "mailto:" , link )     ||                 this.isLinkType( "javascript:" , link ) ||                 this.isLinkType( "news:", link )        ||                  this.isLinkType( "snews:", link ) );     },    // Returns true iff clicked on link is of type given.    isLinkType : function ( linktype, link ) {                try {            // Test for missing protocol property.            if ( !link.protocol ) {                // We must resort to testing the URL string :-(.                var protocol;                if ( link.href ) {                    protocol = link.href.substr( 0, linktype.length );                } else {                    protocol = link.getAttributeNS("http://www.w3.org/1999/xlink","href");                    if ( protocol ) {                        protocol = protocol.substr( 0, linktype.length );                    }                }                return protocol.toLowerCase() === linktype;                    } else {                // Presume all but javascript: urls are saveable.                return link.protocol.toLowerCase() === linktype;            }        } catch (e) {            // something was wrong with the link,            // so we won't be able to save it anyway            return false;        }    },    // Block popup windows    rejectPopupWindows: function(andClose) {      const PM = Components.classes["@mozilla.org/PopupWindowManager;1"]                 .getService(Components.interfaces.nsIPopupWindowManager);      PM.add(this.popupURL, false);      if (andClose) {        const OS = Components.classes["@mozilla.org/observer-service;1"]                   .getService(Components.interfaces.nsIObserverService);        OS.notifyObservers(window, "popup-perm-close", this.popupURL.spec);      }    },    // Unblock popup windows    allowPopupWindows: function() {      const PM = Components.classes["@mozilla.org/PopupWindowManager;1"]                 .getService(Components.interfaces.nsIPopupWindowManager);      PM.add(this.popupURL, true);    },    // Reload clicked-in frame.    reloadFrame : function () {        this.target.ownerDocument.location.reload();    },    // Open clicked-in frame in its own window.    openFrame : function () {        openNewWindowWith( this.target.ownerDocument.location.href );    },    // Open clicked-in frame in the same window    showOnlyThisFrame : function () {        window.loadURI(this.target.ownerDocument.location.href);    },    // View Partial Source    viewPartialSource : function ( context ) {        var focusedWindow = document.commandDispatcher.focusedWindow;        if (focusedWindow == window)          focusedWindow = _content;        var docCharset = null;        if (focusedWindow)          docCharset = "charset=" + focusedWindow.document.characterSet;        // "View Selection Source" and others such as "View MathML Source"        // are mutually exclusive, with the precedence given to the selection        // when there is one        var reference = null;        if (context == "selection")
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