nshelperappdlg.js

firefox的html解析器 本程序实现了想数据库中添加多媒体文件和文件说明

         this.dialogElement("contentTypeImage").setAttribute("src", iconString);

         this.initAppAndSaveToDiskValues();

         // Initialize "always ask me" box. This should always be disabled
         // and set to true for the ambiguous type application/octet-stream.
         // Same if this dialog was forced due to a server request or type
         // sniffing
         var alwaysHandleCheckbox = this.dialogElement( "alwaysHandle" );
         if (this.mReason != REASON_CANTHANDLE ||
             this.mLauncher.MIMEInfo.MIMEType == "application/octet-stream"){
            alwaysHandleCheckbox.checked = false;
            alwaysHandleCheckbox.disabled = true;
         }
         else {
            alwaysHandleCheckbox.checked = !this.mLauncher.MIMEInfo.alwaysAskBeforeHandling;
         }

         // Position it.
         if ( this.mDialog.opener ) {
             this.mDialog.moveToAlertPosition();
         } else {
             this.mDialog.sizeToContent();
             this.mDialog.centerWindowOnScreen();
         }

         // Set initial focus
         this.dialogElement( "mode" ).focus();

         this.mDialog.document.documentElement.getButton("accept").disabled = true;
         const nsITimer = Components.interfaces.nsITimer;
         this._timer = Components.classes["@mozilla.org/timer;1"]
                                 .createInstance(nsITimer);
         this._timer.initWithCallback(this, 1000, nsITimer.TYPE_ONE_SHOT);
    },

    // initIntro:
    initIntro: function(url, filename) {
        var intro = this.dialogElement( "intro" );
        var desc = this.mLauncher.MIMEInfo.description;

        var text;
        if ( this.mReason == REASON_CANTHANDLE )
          text = "intro.";
        else if (this.mReason == REASON_SERVERREQUEST )
          text = "intro.attachment.";
        else if (this.mReason == REASON_TYPESNIFFED )
          text = "intro.sniffed.";

        var modified;
        if (desc)
          modified = this.replaceInsert( this.getString( text + "label" ), 1, desc );
        else
          modified = this.getString( text + "noDesc.label" );

        modified = this.replaceInsert( modified, 2, this.mLauncher.MIMEInfo.MIMEType );
        modified = this.replaceInsert( modified, 3, filename);
        modified = this.replaceInsert( modified, 4, this.getString( "brandShortName" ));

        // if mSourcePath is a local file, then let's use the pretty path name instead of an ugly
        // url...
        var pathString = url.prePath;
        try
        {
          var fileURL = url.QueryInterface(Components.interfaces.nsIFileURL);
          if (fileURL)
          {
            var fileObject = fileURL.file;
            if (fileObject)
            {
              var parentObject = fileObject.parent;
              if (parentObject)
              {
                pathString = parentObject.path;
              }
            }
          }
        } catch(ex) {}


        intro.firstChild.nodeValue = "";
        intro.firstChild.nodeValue = modified;

        // Set the location text, which is separate from the intro text so it can be cropped
        var location = this.dialogElement( "location" );
        location.value = pathString;
        location.setAttribute( "tooltiptext", this.mSourcePath );
    },

    _timer: null,
    notify: function (aTimer) {
        try { // The user may have already canceled the dialog.
          if (!this._blurred)
            this.mDialog.document.documentElement.getButton('accept').disabled = false;
        } catch (ex) {}
        this._timer = null;
    },

    _blurred: false,
    onBlur: function(aEvent) {
        if (aEvent.target != this.mDialog.document)
          return;

        this._blurred = true;
        this.mDialog.document.documentElement.getButton("accept").disabled = true;
    },

    onFocus: function(aEvent) {
        if (aEvent.target != this.mDialog.document)
          return;

        this._blurred = false;
        if (!this._timer) {
          // Don't enable the button if the initial timer is running
          var script = "document.documentElement.getButton('accept').disabled = false";
          this.mDialog.setTimeout(script, 1000);
        }
    },

    // Returns true iff opening the default application makes sense.
    openWithDefaultOK: function() {
        var result;

        // The checking is different on Windows...
        if ( this.mDialog.navigator.platform.indexOf( "Win" ) != -1 ) {
            // Windows presents some special cases.
            // We need to prevent use of "system default" when the file is
            // executable (so the user doesn't launch nasty programs downloaded
            // from the web), and, enable use of "system default" if it isn't
            // executable (because we will prompt the user for the default app
            // in that case).

            // Need to get temporary file and check for executable-ness.
            var tmpFile = this.mLauncher.targetFile;

            //  Default is Ok if the file isn't executable (and vice-versa).
            result = !tmpFile.isExecutable();
        } else {
            // On other platforms, default is Ok if there is a default app.
            // Note that nsIMIMEInfo providers need to ensure that this holds true
            // on each platform.
            result = this.mLauncher.MIMEInfo.hasDefaultHandler;
        }
        return result;
    },

    // Set "default" application description field.
    initDefaultApp: function() {
        // Use description, if we can get one.
        var desc = this.mLauncher.MIMEInfo.defaultDescription;
        if ( desc ) {
            this.dialogElement( "useSystemDefault" ).label = this.replaceInsert( this.getString( "defaultApp" ), 1, desc );
        }
    },

    // getPath:
    getPath: function(file) {
        if (this.mIsMac) {
            return file.leafName || file.path;
        }

        return file.path;
    },

    // initAppAndSaveToDiskValues:
    initAppAndSaveToDiskValues: function() {
        // Fill in helper app info, if there is any.
        this.chosenApp = this.mLauncher.MIMEInfo.preferredApplicationHandler;
        // Initialize "default application" field.
        this.initDefaultApp();

        // Fill application name textbox.
        if (this.chosenApp && this.chosenApp.path) {
            this.dialogElement( "appPath" ).value = this.getPath(this.chosenApp);
        }

        var useDefault = this.dialogElement( "useSystemDefault" );;
        if (this.mLauncher.MIMEInfo.preferredAction == this.nsIMIMEInfo.useSystemDefault &&
            this.mReason != REASON_SERVERREQUEST) {
            // Open (using system default).
            useDefault.radioGroup.selectedItem = useDefault;
        } else if (this.mLauncher.MIMEInfo.preferredAction == this.nsIMIMEInfo.useHelperApp &&
                   this.mReason != REASON_SERVERREQUEST) {
            // Open with given helper app.
            var openUsing = this.dialogElement( "openUsing" );
            openUsing.radioGroup.selectedItem = openUsing;
        } else {
            // Save to disk.
            var saveToDisk = this.dialogElement( "saveToDisk" );
            saveToDisk.radioGroup.selectedItem = saveToDisk;
        }
        // If we don't have a "default app" then disable that choice.
        if ( !this.openWithDefaultOK() ) {
            // Disable that choice.
            useDefault.hidden = true;
            // If that's the default, then switch to "save to disk."
            if ( useDefault.selected ) {
                useDefault.radioGroup.selectedItem = this.dialogElement( "saveToDisk" );
            }
        }

        // Enable/Disable choose application button and textfield
        this.toggleChoice();
    },

    // Enable pick app button if the user chooses that option.
    toggleChoice : function () {
        // See what option is selected.
        var openUsing = this.dialogElement( "openUsing" ).selected;
        this.dialogElement( "chooseApp" ).disabled = !openUsing;
        // appPath is always disabled on Mac
        this.dialogElement( "appPath" ).disabled = !openUsing || this.mIsMac;
        this.updateOKButton();
    },

    // Returns the user-selected application
    helperAppChoice: function() {
        var result = this.chosenApp;
        if (!this.mIsMac) {
            var typed  = this.dialogElement( "appPath" ).value;
            // First, see if one was chosen via the Choose... button.
            if ( result ) {
                // Verify that the user didn't type in something different later.
                if ( typed != result.path ) {
                    // Use what was typed in.
                    try {
                        result.QueryInterface( Components.interfaces.nsILocalFile ).initWithPath( typed );
                    } catch( e ) {
                        // Invalid path was typed.
                        result = null;
                    }
                }
            } else {
                // The user didn't use the Choose... button, try using what they typed in.
                result = Components.classes[ "@mozilla.org/file/local;1" ]
                    .createInstance( Components.interfaces.nsILocalFile );
                try {
                    result.initWithPath( typed );
                } catch( e ) {
                    result = null;
                }
            }
            // Remember what was chosen.
            this.chosenApp = result;
        }
        return result;
    },

    updateOKButton: function() {
        var ok = false;
        if ( this.dialogElement( "saveToDisk" ).selected )
        {
            // This is always OK.
            ok = true;
        }
        else if ( this.dialogElement( "useSystemDefault" ).selected )
        {
            // No app need be specified in this case.
            ok = true;
        }
        else
        {
            // only enable the OK button if we have a default app to use or if
            // the user chose an app....
            ok = this.chosenApp || /\S/.test( this.dialogElement( "appPath" ).value );
        }

        // Enable Ok button if ok to press.
        this.mDialog.document.documentElement.getButton( "accept" ).disabled = !ok;
    },

    // Returns true iff the user-specified helper app has been modified.
    appChanged: function() {
        return this.helperAppChoice() != this.mLauncher.MIMEInfo.preferredApplicationHandler;
    },

    updateMIMEInfo: function() {
        var needUpdate = false;
        // If current selection differs from what's in the mime info object,
        // then we need to update.
        // However, we don't want to change the action all nsIMIMEInfo objects to
        // saveToDisk if mReason is REASON_SERVERREQUEST.
        if ( this.dialogElement( "saveToDisk" ).selected &&
             this.mReason != REASON_SERVERREQUEST ) {
            needUpdate = this.mLauncher.MIMEInfo.preferredAction != this.nsIMIMEInfo.saveToDisk;
            if ( needUpdate )
                this.mLauncher.MIMEInfo.preferredAction = this.nsIMIMEInfo.saveToDisk;
        } else if ( this.dialogElement( "useSystemDefault" ).selected ) {
            needUpdate = this.mLauncher.MIMEInfo.preferredAction != this.nsIMIMEInfo.useSystemDefault;
            if ( needUpdate )