nshelperappdlg.js

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      return this.dialogElement("open").selected && this.dialogElement("openHandler").selectedIndex == 1;
    },
    
    get useSystemDefault() {
      return this.dialogElement("open").selected && this.dialogElement("openHandler").selectedIndex == 0;
    },
    
    toggleRememberChoice: function (aCheckbox) {
        this.dialogElement("settingsChange").hidden = !aCheckbox.checked;
        this.mDialog.sizeToContent();
    },
    
    openHandlerCommand: function () {
      var openHandler = this.dialogElement("openHandler");
      if (openHandler.selectedItem.id == "choose")
        this.chooseApp();
      else
        openHandler.setAttribute("lastSelectedItemID", openHandler.selectedItem.id);
    },

    updateOKButton: function() {
      var ok = false;
      if (this.dialogElement("save").selected) {
        // This is always OK.
        ok = true;
      } 
      else if (this.dialogElement("open").selected) {
        switch (this.dialogElement("openHandler").selectedIndex) {
        case 0:
          // No app need be specified in this case.
          ok = true;
          break;
        case 1:
          // 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("otherHandler").getAttribute("path")); 
        break;
        }
      }

      // 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.
      if (this.saveToDisk) {
        needUpdate = this.mLauncher.MIMEInfo.preferredAction != this.nsIMIMEInfo.saveToDisk;
        if (needUpdate)
          this.mLauncher.MIMEInfo.preferredAction = this.nsIMIMEInfo.saveToDisk;
      } 
      else if (this.useSystemDefault) {
        needUpdate = this.mLauncher.MIMEInfo.preferredAction != this.nsIMIMEInfo.useSystemDefault;
        if (needUpdate)
          this.mLauncher.MIMEInfo.preferredAction = this.nsIMIMEInfo.useSystemDefault;
      } 
      else {
        // For "open with", we need to check both preferred action and whether the user chose
        // a new app.
        needUpdate = this.mLauncher.MIMEInfo.preferredAction != this.nsIMIMEInfo.useHelperApp || this.appChanged();
        if (needUpdate) {
          this.mLauncher.MIMEInfo.preferredAction = this.nsIMIMEInfo.useHelperApp;
          // App may have changed - Update application and description
          var app = this.helperAppChoice();
          this.mLauncher.MIMEInfo.preferredApplicationHandler = app;
          this.mLauncher.MIMEInfo.applicationDescription = "";
        }
      }
      // We will also need to update if the "always ask" flag has changed.
      needUpdate = needUpdate || this.mLauncher.MIMEInfo.alwaysAskBeforeHandling != (!this.dialogElement("rememberChoice").checked);

      // One last special case: If the input "always ask" flag was false, then we always
      // update.  In that case we are displaying the helper app dialog for the first
      // time for this mime type and we need to store the user's action in the mimeTypes.rdf
      // data source (whether that action has changed or not; if it didn't change, then we need
      // to store the "always ask" flag so the helper app dialog will or won't display
      // next time, per the user's selection).
      needUpdate = needUpdate || !this.mLauncher.MIMEInfo.alwaysAskBeforeHandling;

      // Make sure mime info has updated setting for the "always ask" flag.
      this.mLauncher.MIMEInfo.alwaysAskBeforeHandling = !this.dialogElement("rememberChoice").checked;

      return needUpdate;        
    },
    
    // See if the user changed things, and if so, update the
    // mimeTypes.rdf entry for this mime type.
    updateHelperAppPref: function() {
      var ha = new this.mDialog.HelperApps();
      ha.updateTypeInfo(this.mLauncher.MIMEInfo);
      ha.destroy();
    },
    
    // onOK:
    onOK: function() {
      // Verify typed app path, if necessary.
      if (this.useOtherHandler) {
        var helperApp = this.helperAppChoice();
        if (!helperApp || !helperApp.exists()) {
          // Show alert and try again.        
          var bundle = this.dialogElement("strings");                    
          var msg = bundle.getFormattedString("badApp", [this.dialogElement("otherHandler").path]);
          var svc = Components.classes["@mozilla.org/embedcomp/prompt-service;1"].getService(Components.interfaces.nsIPromptService);
          svc.alert(this.mDialog, bundle.getString("badApp.title"), msg);

          // Disable the OK button.
          this.mDialog.document.documentElement.getButton("accept").disabled = true;
          this.dialogElement("mode").focus();          

          // Clear chosen application.
          this.chosenApp = null;

          // Leave dialog up.
          return false;
        }
      }
        
      // Remove our web progress listener (a progress dialog will be
      // taking over).
      this.mLauncher.setWebProgressListener(null);
      
      // saveToDisk and launchWithApplication can return errors in 
      // certain circumstances (e.g. The user clicks cancel in the
      // "Save to Disk" dialog. In those cases, we don't want to
      // update the helper application preferences in the RDF file.
      try {
        var needUpdate = this.updateMIMEInfo();
        
        if (this.dialogElement("save").selected) {
          // If we're using a default download location, create a path
          // for the file to be saved to to pass to |saveToDisk| - otherwise
          // we must ask the user to pick a save name.

//@line 887 "/c/builds/1813/mozilla/toolkit/mozapps/downloads/src/nsHelperAppDlg.js.in"
          this.mLauncher.saveToDisk(null, false);
        }
        else
          this.mLauncher.launchWithApplication(null, false);

        // Update user pref for this mime type (if necessary). We do not
        // store anything in the mime type preferences for the ambiguous
        // type application/octet-stream. We do NOT do this for 
        // application/x-msdownload since we want users to be able to 
        // autodownload these to disk. 
        if (needUpdate && this.mLauncher.MIMEInfo.MIMEType != "application/octet-stream")
          this.updateHelperAppPref();
      } catch(e) { }

      // Unhook dialog from this object.
      this.mDialog.dialog = null;

      // Close up dialog by returning true.
      return true;
    },

    // onCancel:
    onCancel: function() {
      // Remove our web progress listener.
      this.mLauncher.setWebProgressListener(null);

      // Cancel app launcher.
      try {
        const NS_BINDING_ABORTED = 0x804b0002;
        this.mLauncher.cancel(NS_BINDING_ABORTED);
      } catch(exception) {
      }

      // Unhook dialog from this object.
      this.mDialog.dialog = null;

      // Close up dialog by returning true.
      return true;
    },

    // dialogElement:  Convenience. 
    dialogElement: function(id) {
      return this.mDialog.document.getElementById(id);
    },

    // chooseApp:  Open file picker and prompt user for application.
    chooseApp: function() {
      var nsIFilePicker = Components.interfaces.nsIFilePicker;
      var fp = Components.classes["@mozilla.org/filepicker;1"].createInstance(nsIFilePicker);
      fp.init(this.mDialog,
              this.dialogElement("strings").getString("chooseAppFilePickerTitle"),
              nsIFilePicker.modeOpen);

      fp.appendFilters(nsIFilePicker.filterApps);

      if (fp.show() == nsIFilePicker.returnOK && fp.file) {
        // Show the "handler" menulist since we have a (user-specified) 
        // application now.
        this.dialogElement("modeDeck").setAttribute("selectedIndex", "0");
        
        // Remember the file they chose to run.
        this.chosenApp = fp.file;
        // Update dialog.
        var otherHandler = this.dialogElement("otherHandler");
        otherHandler.removeAttribute("hidden");
        otherHandler.setAttribute("path", this.getPath(this.chosenApp));
        otherHandler.label = this.chosenApp.leafName;
        this.dialogElement("openHandler").selectedIndex = 1;
        this.dialogElement("openHandler").setAttribute("lastSelectedItemID", "otherHandler");
        
        this.dialogElement("mode").selectedItem = this.dialogElement("open");
      }
      else {
        var openHandler = this.dialogElement("openHandler");
        var lastSelectedID = openHandler.getAttribute("lastSelectedItemID");
        if (!lastSelectedID)
          lastSelectedID = "defaultHandler";
        openHandler.selectedItem = this.dialogElement(lastSelectedID);
      }
    },

    // Turn this on to get debugging messages.
    debug: false,

    // Dump text (if debug is on).
    dump: function( text ) {
        if ( this.debug ) {
            dump( text ); 
        }
    },

    // dumpInfo:
    doDebug: function() {
        const nsIProgressDialog = Components.interfaces.nsIProgressDialog;
        // Open new progress dialog.
        var progress = Components.classes[ "@mozilla.org/progressdialog;1" ]
                         .createInstance( nsIProgressDialog );
        // Show it.
        progress.open( this.mDialog );
    },

    // dumpObj:
    dumpObj: function( spec ) {
         var val = "<undefined>";
         try {
             val = eval( "this."+spec ).toString();
         } catch( exception ) {
         }
         this.dump( spec + "=" + val + "\n" );
    },

    // dumpObjectProperties
    dumpObjectProperties: function( desc, obj ) {
         for( prop in obj ) {
             this.dump( desc + "." + prop + "=" );
             var val = "<undefined>";
             try {
                 val = obj[ prop ];
             } catch ( exception ) {
             }
             this.dump( val + "\n" );
         }
    }
}

// This Component's module implementation.  All the code below is used to get this
// component registered and accessible via XPCOM.
var module = {
    firstTime: true,

    // registerSelf: Register this component.
    registerSelf: function (compMgr, fileSpec, location, type) {
        if (this.firstTime) {
            this.firstTime = false;
            throw Components.results.NS_ERROR_FACTORY_REGISTER_AGAIN;
        }
        compMgr = compMgr.QueryInterface(Components.interfaces.nsIComponentRegistrar);

        compMgr.registerFactoryLocation( this.cid,
                                         "Unknown Content Type Dialog",
                                         this.contractId,
                                         fileSpec,
                                         location,
                                         type );
    },

    // getClassObject: Return this component's factory object.
    getClassObject: function (compMgr, cid, iid) {
        if (!cid.equals(this.cid)) {
            throw Components.results.NS_ERROR_NO_INTERFACE;
        }

        if (!iid.equals(Components.interfaces.nsIFactory)) {
            throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
        }

        return this.factory;
    },

    /* CID for this class */
    cid: Components.ID("{F68578EB-6EC2-4169-AE19-8C6243F0ABE1}"),

    /* Contract ID for this class */
    contractId: "@mozilla.org/helperapplauncherdialog;1",

    /* factory object */
    factory: {
        // createInstance: Return a new nsProgressDialog object.
        createInstance: function (outer, iid) {
            if (outer != null)
                throw Components.results.NS_ERROR_NO_AGGREGATION;

            return (new nsUnknownContentTypeDialog()).QueryInterface(iid);
        }
    },

    // canUnload: n/a (returns true)
    canUnload: function(compMgr) {
        return true;
    }
};

// NSGetModule: Return the nsIModule object.
function NSGetModule(compMgr, fileSpec) {
    return module;
}