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

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Mozilla browser.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Bill Law    <[e-mail]>
 *   Scott MacGregor <[e-mail]>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/* This file implements the nsIHelperAppLauncherDialog interface.
 *
 * The implementation consists of a JavaScript "class" named nsHelperAppDialog,
 * comprised of:
 *   - a JS constructor function
 *   - a prototype providing all the interface methods and implementation stuff
 *
 * In addition, this file implements an nsIModule object that registers the
 * nsHelperAppDialog component.
 */

const nsIHelperAppLauncherDialog = Components.interfaces.nsIHelperAppLauncherDialog;
const REASON_CANTHANDLE = nsIHelperAppLauncherDialog.REASON_CANTHANDLE;
const REASON_SERVERREQUEST = nsIHelperAppLauncherDialog.REASON_SERVERREQUEST;
const REASON_TYPESNIFFED = nsIHelperAppLauncherDialog.REASON_TYPESNIFFED;


/* ctor
 */
function nsHelperAppDialog() {
    // Initialize data properties.
    this.mLauncher = null;
    this.mContext  = null;
    this.mSourcePath = null;
    this.chosenApp = null;
    this.givenDefaultApp = false;
    this.strings   = new Array;
    this.elements  = new Array;
    this.updateSelf = true;
    this.mTitle    = "";
    this.mIsMac    = false;
}

nsHelperAppDialog.prototype = {
    // Turn this on to get debugging messages.
    debug: false,

    nsIMIMEInfo  : Components.interfaces.nsIMIMEInfo,

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

    // This "class" supports nsIHelperAppLauncherDialog, and nsISupports.
    QueryInterface: function (iid) {
        if (iid.equals(Components.interfaces.nsIHelperAppLauncherDialog) ||
            iid.equals(Components.interfaces.nsISupports))
            return this;

        Components.returnCode = Components.results.NS_ERROR_NO_INTERFACE;
        return null;
    },

    // ---------- nsIHelperAppLauncherDialog methods ----------

    // show: Open XUL dialog using window watcher.  Since the dialog is not
    //       modal, it needs to be a top level window and the way to open
    //       one of those is via that route).
    show: function(aLauncher, aContext, aReason)  {
         this.mLauncher = aLauncher;
         this.mContext  = aContext;
         this.mReason   = aReason;
         // Display the dialog using the Window Watcher interface.
         var ww = Components.classes["@mozilla.org/embedcomp/window-watcher;1"]
                    .getService( Components.interfaces.nsIWindowWatcher );
         this.mDialog = ww.openWindow( null, // no parent
                                       "chrome://global/content/nsHelperAppDlg.xul",
                                       null,
                                       "chrome,titlebar,dialog=yes",
                                       null );
         // Hook this object to the dialog.
         this.mDialog.dialog = this;
         // Watch for error notifications.
         this.mIsMac = (this.mDialog.navigator.platform.indexOf( "Mac" ) != -1);
         this.progressListener.helperAppDlg = this;
         this.mLauncher.setWebProgressListener( this.progressListener );
    },

    // promptForSaveToFile:  Display file picker dialog and return selected file.
    promptForSaveToFile: function(aLauncher, aContext, aDefaultFile, aSuggestedFileExtension) {
        var result = "";

        const prefSvcContractID = "@mozilla.org/preferences-service;1";
        const prefSvcIID = Components.interfaces.nsIPrefService;
        var branch = Components.classes[prefSvcContractID].getService(prefSvcIID)
                                                          .getBranch("browser.download.");
        var dir = null;

        const nsILocalFile = Components.interfaces.nsILocalFile;
        const kDownloadDirPref = "dir";

        // Try and pull in download directory pref
        try {
            dir = branch.getComplexValue(kDownloadDirPref, nsILocalFile);
        } catch (e) { }

        var bundle = Components.classes["@mozilla.org/intl/stringbundle;1"]
                               .getService(Components.interfaces.nsIStringBundleService)
                               .createBundle("chrome://global/locale/nsHelperAppDlg.properties");

        var autoDownload = branch.getBoolPref("autoDownload");
        // If the autoDownload pref is set then just download to default download directory
        if (autoDownload && dir && dir.exists()) {
            if (aDefaultFile == "")
                aDefaultFile = bundle.GetStringFromName("noDefaultFile") + (aSuggestedFileExtension || "");
            dir.append(aDefaultFile);
            return uniqueFile(dir);
        }

        // Use file picker to show dialog.
        var nsIFilePicker = Components.interfaces.nsIFilePicker;
        var picker = Components.classes[ "@mozilla.org/filepicker;1" ]
                       .createInstance( nsIFilePicker );

        var windowTitle = bundle.GetStringFromName( "saveDialogTitle" );

        var parent = aContext
                        .QueryInterface( Components.interfaces.nsIInterfaceRequestor )
                        .getInterface( Components.interfaces.nsIDOMWindowInternal );
        picker.init( parent, windowTitle, nsIFilePicker.modeSave );
        picker.defaultString = aDefaultFile;
        if (aSuggestedFileExtension) {
            // aSuggestedFileExtension includes the period, so strip it
            picker.defaultExtension = aSuggestedFileExtension.substring(1);
        } else {
            try {
                picker.defaultExtension = this.mLauncher.MIMEInfo.primaryExtension;
            } catch (ex) {
            }
        }

        var wildCardExtension = "*";
        if ( aSuggestedFileExtension ) {
            wildCardExtension += aSuggestedFileExtension;
            picker.appendFilter( wildCardExtension, wildCardExtension );
        }

        picker.appendFilters( nsIFilePicker.filterAll );

        try {
            if (dir.exists())
                picker.displayDirectory = dir;
        } catch (e) { }

        if (picker.show() == nsIFilePicker.returnCancel || !picker.file) {
            // Null result means user cancelled.
            return null;
        }

        // If not using specified location save the user's choice of directory
        if (branch.getBoolPref("lastLocation") || autoDownload) {
            var directory = picker.file.parent.QueryInterface(nsILocalFile);
            branch.setComplexValue(kDownloadDirPref, nsILocalFile, directory);
        }

        return picker.file;
    },

    // ---------- implementation methods ----------

    // Web progress listener so we can detect errors while mLauncher is
    // streaming the data to a temporary file.
    progressListener: {
        // Implementation properties.
        helperAppDlg: null,

        // nsIWebProgressListener methods.
        // Look for error notifications and display alert to user.
        onStatusChange: function( aWebProgress, aRequest, aStatus, aMessage ) {
            if ( aStatus != Components.results.NS_OK ) {
                // Get prompt service.
                var prompter = Components.classes[ "@mozilla.org/embedcomp/prompt-service;1" ]
                                   .getService( Components.interfaces.nsIPromptService );
                // Display error alert (using text supplied by back-end).
                prompter.alert( this.dialog, this.helperAppDlg.mTitle, aMessage );

                // Close the dialog.
                this.helperAppDlg.onCancel();
                if ( this.helperAppDlg.mDialog ) {
                    this.helperAppDlg.mDialog.close();
                }
            }
        },

        // Ignore onProgressChange, onStateChange, onLocationChange, and onSecurityChange notifications.
        onProgressChange: function( aWebProgress,
                                    aRequest,
                                    aCurSelfProgress,
                                    aMaxSelfProgress,
                                    aCurTotalProgress,
                                    aMaxTotalProgress ) {
        },

        onProgressChange64: function( aWebProgress,
                                      aRequest,
                                      aCurSelfProgress,
                                      aMaxSelfProgress,
                                      aCurTotalProgress,
                                      aMaxTotalProgress ) {
        },

        onStateChange: function( aWebProgress, aRequest, aStateFlags, aStatus ) {
        },

        onLocationChange: function( aWebProgress, aRequest, aLocation ) {
        },

        onSecurityChange: function( aWebProgress, aRequest, state ) {
        }
    },

    // initDialog:  Fill various dialog fields with initial content.
    initDialog : function() {
         // Put product brand short name in prompt.
         var prompt = this.dialogElement( "prompt" );
         var modified = this.replaceInsert( prompt.firstChild.nodeValue, 1, this.getString( "brandShortName" ) );
         prompt.firstChild.nodeValue = modified;

         // Put file name in window title.
         var suggestedFileName = this.mLauncher.suggestedFileName;

         // Some URIs do not implement nsIURL, so we can't just QI.
         var url = this.mLauncher.source.clone();
         try {
           url.userPass = "";
         } catch (ex) {}
         var fname = "";
         this.mSourcePath = url.prePath;
         try {
             url = url.QueryInterface( Components.interfaces.nsIURL );
             // A url, use file name from it.
             fname = url.fileName;
             this.mSourcePath += url.directory;
         } catch (ex) {
             // A generic uri, use path.
             fname = url.path;
             this.mSourcePath += url.path;
         }

         if (suggestedFileName)
           fname = suggestedFileName;

         this.mTitle = this.replaceInsert( this.mDialog.document.title, 1, fname);
         this.mDialog.document.title = this.mTitle;

         // Put content type, filename and location into intro.
         this.initIntro(url, fname);

         var iconString = "moz-icon://" + fname + "?size=32&contentType=" + this.mLauncher.MIMEInfo.MIMEType;