nsprogressdialog.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

/* vim:set ts=4 sts=4 sw=4 et cin: */
/* ***** 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 Mozilla Progress Dialog.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corp.
 * Portions created by the Initial Developer are Copyright (C) 2002
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Bill Law       <[e-mail]>
 *   Aaron Kaluszka <[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 nsIProgressDialog interface.  See nsIProgressDialog.idl
 *
 * The implementation consists of a JavaScript "class" named nsProgressDialog,
 * 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
 * nsProgressDialog component.
 */

/* ctor
 */
function nsProgressDialog() {
    // Initialize data properties.
    this.mParent      = null;
    this.mOperation   = null;
    this.mStartTime   = ( new Date() ).getTime();
    this.observer     = null;
    this.mLastUpdate  = Number.MIN_VALUE; // To ensure first onProgress causes update.
    this.mInterval    = 750; // Default to .75 seconds.
    this.mElapsed     = 0;
    this.mLoaded      = false;
    this.fields       = new Array;
    this.strings      = new Array;
    this.mSource      = null;
    this.mTarget      = null;
    this.mTargetFile  = null;
    this.mMIMEInfo    = null;
    this.mDialog      = null;
    this.mDisplayName = null;
    this.mPaused      = false;
    this.mRequest     = null;
    this.mCompleted   = false;
    this.mMode        = "normal";
    this.mPercent     = -1;
    this.mRate        = 0;
    this.mBundle      = null;
    this.mCancelDownloadOnClose = true;
}

const nsIProgressDialog      = Components.interfaces.nsIProgressDialog;
const nsIWindowWatcher       = Components.interfaces.nsIWindowWatcher;
const nsIWebProgressListener = Components.interfaces.nsIWebProgressListener;
const nsITextToSubURI        = Components.interfaces.nsITextToSubURI;
const nsIChannel             = Components.interfaces.nsIChannel;
const nsIFileURL             = Components.interfaces.nsIFileURL;
const nsIURL                 = Components.interfaces.nsIURL;
const nsILocalFile           = Components.interfaces.nsILocalFile;

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

    // Chrome-related constants.
    dialogChrome:   "chrome://global/content/nsProgressDialog.xul",
    dialogFeatures: "chrome,titlebar,minimizable=yes,dialog=no",

    // getters/setters
    get saving()            { return this.MIMEInfo == null ||
                              this.MIMEInfo.preferredAction == Components.interfaces.nsIMIMEInfo.saveToDisk; },
    get parent()            { return this.mParent; },
    set parent(newval)      { return this.mParent = newval; },
    get operation()         { return this.mOperation; },
    set operation(newval)   { return this.mOperation = newval; },
    get observer()          { return this.mObserver; },
    set observer(newval)    { return this.mObserver = newval; },
    get startTime()         { return this.mStartTime; },
    set startTime(newval)   { return this.mStartTime = newval/1000; }, // PR_Now() is in microseconds, so we convert.
    get lastUpdate()        { return this.mLastUpdate; },
    set lastUpdate(newval)  { return this.mLastUpdate = newval; },
    get interval()          { return this.mInterval; },
    set interval(newval)    { return this.mInterval = newval; },
    get elapsed()           { return this.mElapsed; },
    set elapsed(newval)     { return this.mElapsed = newval; },
    get loaded()            { return this.mLoaded; },
    set loaded(newval)      { return this.mLoaded = newval; },
    get source()            { return this.mSource; },
    set source(newval)      { return this.mSource = newval; },
    get target()            { return this.mTarget; },
    get targetFile()        { return this.mTargetFile; },
    get MIMEInfo()          { return this.mMIMEInfo; },
    set MIMEInfo(newval)    { return this.mMIMEInfo = newval; },
    get dialog()            { return this.mDialog; },
    set dialog(newval)      { return this.mDialog = newval; },
    get displayName()       { return this.mDisplayName; },
    set displayName(newval) { return this.mDisplayName = newval; },
    get paused()            { return this.mPaused; },
    get completed()         { return this.mCompleted; },
    get mode()              { return this.mMode; },
    get percent()           { return this.mPercent; },
    get rate()              { return this.mRate; },
    get kRate()             { return this.mRate / 1024; },
    get cancelDownloadOnClose() { return this.mCancelDownloadOnClose; },
    set cancelDownloadOnClose(newval) { return this.mCancelDownloadOnClose = newval; },

    set target(newval) {
        // If newval references a file on the local filesystem, then grab a
        // reference to its corresponding nsIFile.
        if (newval instanceof nsIFileURL && newval.file instanceof nsILocalFile) {
            this.mTargetFile = newval.file.QueryInterface(nsILocalFile);
        } else {
            this.mTargetFile = null;
        }

        return this.mTarget = newval;
    },

    // These setters use functions that update the dialog.
    set paused(newval)      { return this.setPaused(newval); },
    set completed(newval)   { return this.setCompleted(newval); },
    set mode(newval)        { return this.setMode(newval); },
    set percent(newval)     { return this.setPercent(newval); },
    set rate(newval)        { return this.setRate(newval); },

    // ---------- nsIProgressDialog methods ----------

    // open: Store aParentWindow and open the dialog.
    open: function( aParentWindow ) {
        // Save parent and "persist" operation.
        this.parent    = aParentWindow;

        // Open dialog using the WindowWatcher service.
        var ww = Components.classes["@mozilla.org/embedcomp/window-watcher;1"]
                   .getService( nsIWindowWatcher );
        this.dialog = ww.openWindow( this.parent,
                                     this.dialogChrome,
                                     null,
                                     this.dialogFeatures,
                                     this );
    },

    init: function( aSource, aTarget, aDisplayName, aMIMEInfo, aStartTime,
                    aTempFile, aOperation ) {
      this.source = aSource;
      this.target = aTarget;
      this.displayName = aDisplayName;
      this.MIMEInfo = aMIMEInfo;
      if ( aStartTime ) {
          this.startTime = aStartTime;
      }
      this.operation = aOperation;
    },

    // ---------- nsIWebProgressListener methods ----------

    // Look for STATE_STOP and update dialog to indicate completion when it happens.
    onStateChange: function( aWebProgress, aRequest, aStateFlags, aStatus ) {
        if ( aStateFlags & nsIWebProgressListener.STATE_STOP ) {
            // if we are downloading, then just wait for the first STATE_STOP
            if ( this.targetFile != null ) {
                // we are done transferring...
                this.completed = true;
                return;
            }

            // otherwise, wait for STATE_STOP with aRequest corresponding to
            // our target.  XXX redirects might screw up this logic.
            try {
                var chan = aRequest.QueryInterface(nsIChannel);
                if (chan.URI.equals(this.target)) {
                    // we are done transferring...
                    this.completed = true;
                }
            }
            catch (e) {
            }
        }
    },

    // Handle progress notifications.
    onProgressChange: function( aWebProgress,
                                aRequest,
                                aCurSelfProgress,
                                aMaxSelfProgress,
                                aCurTotalProgress,
                                aMaxTotalProgress ) {
      return onProgressChange64(aWebProgress, aRequest, aCurSelfProgress,
              aMaxSelfProgress, aCurTotalProgress, aMaxTotalProgress);
    },

    onProgressChange64: function( aWebProgress,
                                  aRequest,
                                  aCurSelfProgress,
                                  aMaxSelfProgress,
                                  aCurTotalProgress,
                                  aMaxTotalProgress ) {
        var overallProgress = aCurTotalProgress;

        // Get current time.
        var now = ( new Date() ).getTime();

        // If interval hasn't elapsed, ignore it.
        if ( now - this.lastUpdate < this.interval &&
             aMaxTotalProgress != "-1" &&
             parseInt( aCurTotalProgress ) < parseInt( aMaxTotalProgress ) ) {
            return;
        }

        // Update this time.
        this.lastUpdate = now;

        // Update elapsed time.
        this.elapsed = now - this.startTime;

        // Calculate percentage.
        if ( aMaxTotalProgress > 0) {
            this.percent = Math.floor( ( overallProgress * 100.0 ) / aMaxTotalProgress );
        } else {
            this.percent = -1;
        }

        // If dialog not loaded, then don't bother trying to update display.
        if ( !this.loaded ) {
            return;
        }

        // Update dialog's display of elapsed time.
        this.setValue( "timeElapsed", this.formatSeconds( this.elapsed / 1000 ) );

        // Now that we've set the progress and the time, update # bytes downloaded...
        // Update status (nnK of mmK bytes at xx.xK aCurTotalProgress/sec)
        var status = this.getString( "progressMsg" );

        // Insert 1 is the number of kilobytes downloaded so far.
        status = this.replaceInsert( status, 1, parseInt( overallProgress/1024 + .5 ) );

        // Insert 2 is the total number of kilobytes to be downloaded (if known).
        if ( aMaxTotalProgress != "-1" ) {
            status = this.replaceInsert( status, 2, parseInt( aMaxTotalProgress/1024 + .5 ) );
        } else {
            status = this.replaceInsert( status, 2, "??" );
        }

        // Insert 3 is the download rate.
        if ( this.elapsed ) {
            this.rate = ( aCurTotalProgress * 1000 ) / this.elapsed;
            status = this.replaceInsert( status, 3, this.rateToKRate( this.rate ) );
        } else {
            // Rate not established, yet.
            status = this.replaceInsert( status, 3, "??.?" );
        }

        // All 3 inserts are taken care of, now update status msg.
        this.setValue( "status", status );

        // Update time remaining.
        if ( this.rate && ( aMaxTotalProgress > 0 ) ) {
            // Calculate how much time to download remaining at this rate.
            var rem = Math.round( ( aMaxTotalProgress - aCurTotalProgress ) / this.rate );
            this.setValue( "timeLeft", this.formatSeconds( rem ) );
        } else {
            // We don't know how much time remains.
            this.setValue( "timeLeft", this.getString( "unknownTime" ) );
        }
    },

    // Look for error notifications and display alert to user.
    onStatusChange: function( aWebProgress, aRequest, aStatus, aMessage ) {
        // Check for error condition (only if dialog is still open).
        if ( aStatus != Components.results.NS_OK ) {
            if ( this.loaded ) {
                // 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).
                var title = this.getProperty( this.saving ? "savingAlertTitle" : "openingAlertTitle",
                                              [ this.fileName() ],
                                              1 );
                prompter.alert( this.dialog, title, aMessage );

                // Close the dialog.
                if ( !this.completed ) {
                    this.onCancel();
                }
            } else {
                // Error occurred prior to onload even firing.
                // We can't handle this error until we're done loading, so