The Tor Browser: browser/components/downloads/content/allDownloadsViewOverlay.js@7e26c7da4463 (annotated)

browser/components/downloads/content/allDownloadsViewOverlay.js@7e26c7da4463 (annotated)

browser/components/downloads/content/allDownloadsViewOverlay.js

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 /**
  * THE PLACES VIEW IMPLEMENTED IN THIS FILE HAS A VERY PARTICULAR USE CASE.
  * IT IS HIGHLY RECOMMENDED NOT TO EXTEND IT FOR ANY OTHER USE CASES OR RELY
  * ON IT AS AN API.
  */
 let Cu = Components.utils;
 let Ci = Components.interfaces;
 let Cc = Components.classes;
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/Services.jsm");
 Cu.import("resource://gre/modules/NetUtil.jsm");
 Cu.import("resource://gre/modules/DownloadUtils.jsm");
 Cu.import("resource:///modules/DownloadsCommon.jsm");
 Cu.import("resource://gre/modules/PlacesUtils.jsm");
 Cu.import("resource://gre/modules/osfile.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "PrivateBrowsingUtils",
                                   "resource://gre/modules/PrivateBrowsingUtils.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "RecentWindow",
                                   "resource:///modules/RecentWindow.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "FileUtils",
                                   "resource://gre/modules/FileUtils.jsm");
 const nsIDM = Ci.nsIDownloadManager;
 const DESTINATION_FILE_URI_ANNO  = "downloads/destinationFileURI";
 const DOWNLOAD_META_DATA_ANNO    = "downloads/metaData";
 const DOWNLOAD_VIEW_SUPPORTED_COMMANDS =
  ["cmd_delete", "cmd_copy", "cmd_paste", "cmd_selectAll",
   "downloadsCmd_pauseResume", "downloadsCmd_cancel",
   "downloadsCmd_open", "downloadsCmd_show", "downloadsCmd_retry",
   "downloadsCmd_openReferrer", "downloadsCmd_clearDownloads"];
 const NOT_AVAILABLE = Number.MAX_VALUE;
 /**
  * A download element shell is responsible for handling the commands and the
  * displayed data for a single download view element. The download element
  * could represent either a past download (for which we get data from places)  or
  * a "session" download (using a data-item object. See DownloadsCommon.jsm), or both.
  *
  * Once initialized with either a data item or a places node, the created richlistitem
  * can be accessed through the |element| getter, and can then be inserted/removed from
  * a richlistbox.
  *
  * The shell doesn't take care of inserting the item, or removing it when it's no longer
  * valid. That's the caller (a DownloadsPlacesView object) responsibility.
  *
  * The caller is also responsible for "passing over" notification from both the
  * download-view and the places-result-observer, in the following manner:
  *  - The DownloadsPlacesView object implements getViewItem of the download-view
  *    pseudo interface.  It returns this object (therefore we implement
  *    onStateChangea and onProgressChange here).
  *  - The DownloadsPlacesView object adds itself as a places result observer and
  *    calls this object's placesNodeIconChanged, placesNodeTitleChanged and
  *    placeNodeAnnotationChanged from its callbacks.
  *
  * @param [optional] aDataItem
  *        The data item of a the session download. Required if aPlacesNode is not set
  * @param [optional] aPlacesNode
  *        The places node for a past download. Required if aDataItem is not set.
  * @param [optional] aAnnotations
  *        Map containing annotations values, to speed up the initial loading.
  */
 function DownloadElementShell(aDataItem, aPlacesNode, aAnnotations) {
   this._element = document.createElement("richlistitem");
   this._element._shell = this;
   this._element.classList.add("download");
   this._element.classList.add("download-state");
   if (aAnnotations)
     this._annotations = aAnnotations;
   if (aDataItem)
     this.dataItem = aDataItem;
   if (aPlacesNode)
     this.placesNode = aPlacesNode;
 }
 DownloadElementShell.prototype = {
   // The richlistitem for the download
   get element() this._element,
   /**
    * Manages the "active" state of the shell.  By default all the shells
    * without a dataItem are inactive, thus their UI is not updated.  They must
    * be activated when entering the visible area.  Session downloads are
    * always active since they always have a dataItem.
    */
   ensureActive: function DES_ensureActive() {
     if (!this._active) {
       this._active = true;
       this._element.setAttribute("active", true);
       this._updateUI();
     }
   },
   get active() !!this._active,
   // The data item for the download
   _dataItem: null,
   get dataItem() this._dataItem,
   set dataItem(aValue) {
     if (this._dataItem != aValue) {
       if (!aValue && !this._placesNode)
         throw new Error("Should always have either a dataItem or a placesNode");
       this._dataItem = aValue;
       if (!this.active)
         this.ensureActive();
       else
         this._updateUI();
     }
     return aValue;
   },
   _placesNode: null,
   get placesNode() this._placesNode,
   set placesNode(aValue) {
     if (this._placesNode != aValue) {
       if (!aValue && !this._dataItem)
         throw new Error("Should always have either a dataItem or a placesNode");
       // Preserve the annotations map if this is the first loading and we got
       // cached values.
       if (this._placesNode || !this._annotations) {
         this._annotations = new Map();
       }
       this._placesNode = aValue;
       // We don't need to update the UI if we had a data item, because
       // the places information isn't used in this case.
       if (!this._dataItem && this.active)
         this._updateUI();
     }
     return aValue;
   },
   // The download uri (as a string)
   get downloadURI() {
     if (this._dataItem)
      return this._dataItem.uri;
     if (this._placesNode)
       return this._placesNode.uri;
     throw new Error("Unexpected download element state");
   },
   get _downloadURIObj() {
     if (!("__downloadURIObj" in this))
       this.__downloadURIObj = NetUtil.newURI(this.downloadURI);
     return this.__downloadURIObj;
   },
   _getIcon: function DES__getIcon() {
     let metaData = this.getDownloadMetaData();
     if ("filePath" in metaData)
       return "moz-icon://" + metaData.filePath + "?size=32";
     if (this._placesNode) {
       // Try to extract an extension from the uri.
       let ext = this._downloadURIObj.QueryInterface(Ci.nsIURL).fileExtension;
       if (ext)
         return "moz-icon://." + ext + "?size=32";
       return this._placesNode.icon || "moz-icon://.unknown?size=32";
     }
     if (this._dataItem)
       throw new Error("Session-download items should always have a target file uri");
     throw new Error("Unexpected download element state");
   },
   // Helper for getting a places annotation set for the download.
   _getAnnotation: function DES__getAnnotation(aAnnotation, aDefaultValue) {
     let value;
     if (this._annotations.has(aAnnotation))
       value = this._annotations.get(aAnnotation);
     // If the value is cached, or we know it doesn't exist, avoid a database
     // lookup.
     if (value === undefined) {
       try {
         value = PlacesUtils.annotations.getPageAnnotation(
           this._downloadURIObj, aAnnotation);
       }
       catch(ex) {
         value = NOT_AVAILABLE;
       }
     }
     if (value === NOT_AVAILABLE) {
       if (aDefaultValue === undefined) {
         throw new Error("Could not get required annotation '" + aAnnotation +
                         "' for download with url '" + this.downloadURI + "'");
       }
       value = aDefaultValue;
     }
     this._annotations.set(aAnnotation, value);
     return value;
   },
   _fetchTargetFileInfo: function DES__fetchTargetFileInfo(aUpdateMetaDataAndStatusUI = false) {
     if (this._targetFileInfoFetched)
       throw new Error("_fetchTargetFileInfo should not be called if the information was already fetched");
     if (!this.active)
       throw new Error("Trying to _fetchTargetFileInfo on an inactive download shell");
     let path = this.getDownloadMetaData().filePath;
     // In previous version, the target file annotations were not set,
     // so we cannot tell where is the file.
     if (path === undefined) {
       this._targetFileInfoFetched = true;
       this._targetFileExists = false;
       if (aUpdateMetaDataAndStatusUI) {
         this._metaData = null;
         this._updateDownloadStatusUI();
       }
       // Here we don't need to update the download commands,
       // as the state is unknown as it was.
       return;
     }
     OS.File.stat(path).then(
       function onSuccess(fileInfo) {
         this._targetFileInfoFetched = true;
         this._targetFileExists = true;
         this._targetFileSize = fileInfo.size;
         if (aUpdateMetaDataAndStatusUI) {
           this._metaData = null;
           this._updateDownloadStatusUI();
         }
         if (this._element.selected)
           goUpdateDownloadCommands();
       }.bind(this),
       function onFailure(aReason) {
         if (aReason instanceof OS.File.Error && aReason.becauseNoSuchFile) {
           this._targetFileInfoFetched = true;
           this._targetFileExists = false;
         }
         else {
           Cu.reportError("Could not fetch info for target file (reason: " +
                          aReason + ")");
         }
         if (aUpdateMetaDataAndStatusUI) {
           this._metaData = null;
           this._updateDownloadStatusUI();
         }
         if (this._element.selected)
           goUpdateDownloadCommands();
       }.bind(this)
     );
   },
   _getAnnotatedMetaData: function DES__getAnnotatedMetaData()
     JSON.parse(this._getAnnotation(DOWNLOAD_META_DATA_ANNO)),
   _extractFilePathAndNameFromFileURI:
   function DES__extractFilePathAndNameFromFileURI(aFileURI) {
     let file = Cc["@mozilla.org/network/protocol;1?name=file"]
                 .getService(Ci.nsIFileProtocolHandler)
                 .getFileFromURLSpec(aFileURI);
     return [file.path, file.leafName];
   },
   /**
    * Retrieve the meta data object for the download.  The following fields
    * may be set.
    *
    * - state - any download state defined in nsIDownloadManager.  If this field
    *   is not set, the download state is unknown.
    * - endTime: the end time of the download.
    * - filePath: the downloaded file path on the file system, when it
    *   was downloaded.  The file may not exist.  This is set for session
    *   downloads that have a local file set, and for history downloads done
    *   after the landing of bug 591289.
    * - fileName: the downloaded file name on the file system. Set if filePath
    *   is set.
    * - displayName: the user-facing label for the download.  This is always
    *   set.  If available, it's set to the downloaded file name.  If not,
    *   the places title for the download uri is used it's set.  As a last
    *   resort, we fallback to the download uri.
    * - fileSize (only set for downloads which completed succesfully):
    *   the downloaded file size.  For downloads done after the landing of
    *   bug 826991, this value is "static" - that is, it does not necessarily
    *   mean that the file is in place and has this size.
    */
   getDownloadMetaData: function DES_getDownloadMetaData() {
     if (!this._metaData) {
       if (this._dataItem) {
         this._metaData = {
           state:       this._dataItem.state,
           endTime:     this._dataItem.endTime,
           fileName:    this._dataItem.target,
           displayName: this._dataItem.target
         };
         if (this._dataItem.done)
           this._metaData.fileSize = this._dataItem.maxBytes;
         if (this._dataItem.localFile)
           this._metaData.filePath = this._dataItem.localFile.path;
       }
       else {
         try {
           this._metaData = this._getAnnotatedMetaData();
         }
         catch(ex) {
           this._metaData = { };
           if (this._targetFileInfoFetched && this._targetFileExists) {
             this._metaData.state = this._targetFileSize > 0 ?
               nsIDM.DOWNLOAD_FINISHED : nsIDM.DOWNLOAD_FAILED;
             this._metaData.fileSize = this._targetFileSize;
           }
           // This is actually the start-time, but it's the best we can get.
           this._metaData.endTime = this._placesNode.time / 1000;
         }
         try {
           let targetFileURI = this._getAnnotation(DESTINATION_FILE_URI_ANNO);
           [this._metaData.filePath, this._metaData.fileName] =
             this._extractFilePathAndNameFromFileURI(targetFileURI);
           this._metaData.displayName = this._metaData.fileName;
         }
         catch(ex) {
           this._metaData.displayName = this._placesNode.title || this.downloadURI;
         }
       }
     }
     return this._metaData;
   },
   // The status text for the download
   _getStatusText: function DES__getStatusText() {
     let s = DownloadsCommon.strings;
     if (this._dataItem && this._dataItem.inProgress) {
       if (this._dataItem.paused) {
         let transfer =
           DownloadUtils.getTransferTotal(this._dataItem.currBytes,
                                          this._dataItem.maxBytes);
          // We use the same XUL label to display both the state and the amount
          // transferred, for example "Paused -  1.1 MB".
          return s.statusSeparatorBeforeNumber(s.statePaused, transfer);
       }
       if (this._dataItem.state == nsIDM.DOWNLOAD_DOWNLOADING) {
         let [status, newEstimatedSecondsLeft] =
           DownloadUtils.getDownloadStatus(this.dataItem.currBytes,
                                           this.dataItem.maxBytes,
                                           this.dataItem.speed,
                                           this._lastEstimatedSecondsLeft || Infinity);
         this._lastEstimatedSecondsLeft = newEstimatedSecondsLeft;
         return status;
       }
       if (this._dataItem.starting) {
         return s.stateStarting;
       }
       if (this._dataItem.state == nsIDM.DOWNLOAD_SCANNING) {
         return s.stateScanning;
       }
       throw new Error("_getStatusText called with a bogus download state");
     }
     // This is a not-in-progress or history download.
     let stateLabel = "";
     let state = this.getDownloadMetaData().state;
     switch (state) {
       case nsIDM.DOWNLOAD_FAILED:
         stateLabel = s.stateFailed;
         break;
       case nsIDM.DOWNLOAD_CANCELED:
         stateLabel = s.stateCanceled;
         break;
       case nsIDM.DOWNLOAD_BLOCKED_PARENTAL:
         stateLabel = s.stateBlockedParentalControls;
         break;
       case nsIDM.DOWNLOAD_BLOCKED_POLICY:
         stateLabel = s.stateBlockedPolicy;
         break;
       case nsIDM.DOWNLOAD_DIRTY:
         stateLabel = s.stateDirty;
         break;
       case nsIDM.DOWNLOAD_FINISHED:{
         // For completed downloads, show the file size (e.g. "1.5 MB")
         let metaData = this.getDownloadMetaData();
         if ("fileSize" in metaData) {
           let [size, unit] = DownloadUtils.convertByteUnits(metaData.fileSize);
           stateLabel = s.sizeWithUnits(size, unit);
           break;
         }
         // Fallback to default unknown state.
       }
       default:
         stateLabel = s.sizeUnknown;
         break;
     }
     // TODO (bug 829201): history downloads should get the referrer from Places.
     let referrer = this._dataItem && this._dataItem.referrer ||
                    this.downloadURI;
     let [displayHost, fullHost] = DownloadUtils.getURIHost(referrer);
     let date = new Date(this.getDownloadMetaData().endTime);
     let [displayDate, fullDate] = DownloadUtils.getReadableDates(date);
     // We use the same XUL label to display the state, the host name, and the
     // end time.
     let firstPart = s.statusSeparator(stateLabel, displayHost);
     return s.statusSeparator(firstPart, displayDate);
   },
   // The progressmeter element for the download
   get _progressElement() {
     if (!("__progressElement" in this)) {
       this.__progressElement =
         document.getAnonymousElementByAttribute(this._element, "anonid",
                                                 "progressmeter");
     }
     return this.__progressElement;
   },
   // Updates the download state attribute (and by that hide/unhide the
   // appropriate buttons and context menu items), the status text label,
   // and the progress meter.
   _updateDownloadStatusUI: function  DES__updateDownloadStatusUI() {
     if (!this.active)
       throw new Error("_updateDownloadStatusUI called for an inactive item.");
     let state = this.getDownloadMetaData().state;
     if (state !== undefined)
       this._element.setAttribute("state", state);
     this._element.setAttribute("status", this._getStatusText());
     // For past-downloads, we're done. For session-downloads, we may also need
     // to update the progress-meter.
     if (!this._dataItem)
       return;
     // Copied from updateProgress in downloads.js.
     if (this._dataItem.starting) {
       // Before the download starts, the progress meter has its initial value.
       this._element.setAttribute("progressmode", "normal");
       this._element.setAttribute("progress", "0");
     }
     else if (this._dataItem.state == nsIDM.DOWNLOAD_SCANNING ||
              this._dataItem.percentComplete == -1) {
       // We might not know the progress of a running download, and we don't know
       // the remaining time during the malware scanning phase.
       this._element.setAttribute("progressmode", "undetermined");
     }
     else {
       // This is a running download of which we know the progress.
       this._element.setAttribute("progressmode", "normal");
       this._element.setAttribute("progress", this._dataItem.percentComplete);
     }
     // Dispatch the ValueChange event for accessibility, if possible.
     if (this._progressElement) {
       let event = document.createEvent("Events");
       event.initEvent("ValueChange", true, true);
       this._progressElement.dispatchEvent(event);
     }
   },
   _updateDisplayNameAndIcon: function DES__updateDisplayNameAndIcon() {
     let metaData = this.getDownloadMetaData();
     this._element.setAttribute("displayName", metaData.displayName);
     this._element.setAttribute("image", this._getIcon());
   },
   _updateUI: function DES__updateUI() {
     if (!this.active)
       throw new Error("Trying to _updateUI on an inactive download shell");
     this._metaData = null;
     this._targetFileInfoFetched = false;
     this._updateDisplayNameAndIcon();
     // For history downloads done in past releases, the downloads/metaData
     // annotation is not set, and therefore we cannot tell the download
     // state without the target file information.
     if (this._dataItem || this.getDownloadMetaData().state !== undefined)
       this._updateDownloadStatusUI();
     else
       this._fetchTargetFileInfo(true);
   },
   placesNodeIconChanged: function DES_placesNodeIconChanged() {
     if (!this._dataItem)
       this._element.setAttribute("image", this._getIcon());
   },
   placesNodeTitleChanged: function DES_placesNodeTitleChanged() {
     // If there's a file path, we use the leaf name for the title.
     if (!this._dataItem && this.active && !this.getDownloadMetaData().filePath) {
       this._metaData = null;
       this._updateDisplayNameAndIcon();
     }
   },
   placesNodeAnnotationChanged: function DES_placesNodeAnnotationChanged(aAnnoName) {
     this._annotations.delete(aAnnoName);
     if (!this._dataItem && this.active) {
       if (aAnnoName == DOWNLOAD_META_DATA_ANNO) {
         let metaData = this.getDownloadMetaData();
         let annotatedMetaData = this._getAnnotatedMetaData();
         metaData.endTme = annotatedMetaData.endTime;
         if ("fileSize" in annotatedMetaData)
           metaData.fileSize = annotatedMetaData.fileSize;
         else
           delete metaData.fileSize;
         if (metaData.state != annotatedMetaData.state) {
           metaData.state = annotatedMetaData.state;
           if (this._element.selected)
             goUpdateDownloadCommands();
         }
         this._updateDownloadStatusUI();
       }
       else if (aAnnoName == DESTINATION_FILE_URI_ANNO) {
         let metaData = this.getDownloadMetaData();
         let targetFileURI = this._getAnnotation(DESTINATION_FILE_URI_ANNO);
         [metaData.filePath, metaData.fileName] =
             this._extractFilePathAndNameFromFileURI(targetFileURI);
         metaData.displayName = metaData.fileName;
         this._updateDisplayNameAndIcon();
         if (this._targetFileInfoFetched) {
           // This will also update the download commands if necessary.
           this._targetFileInfoFetched = false;
           this._fetchTargetFileInfo();
         }
       }
     }
   },
   /* DownloadView */
   onStateChange: function DES_onStateChange(aOldState) {
     let metaData = this.getDownloadMetaData();
     metaData.state = this.dataItem.state;
     if (aOldState != nsIDM.DOWNLOAD_FINISHED && aOldState != metaData.state) {
       // See comment in DVI_onStateChange in downloads.js (the panel-view)
       this._element.setAttribute("image", this._getIcon() + "&state=normal");
       metaData.fileSize = this._dataItem.maxBytes;
       if (this._targetFileInfoFetched) {
         this._targetFileInfoFetched = false;
         this._fetchTargetFileInfo();
       }
     }
     this._updateDownloadStatusUI();
     if (this._element.selected)
       goUpdateDownloadCommands();
     else
       goUpdateCommand("downloadsCmd_clearDownloads");
   },
   /* DownloadView */
   onProgressChange: function DES_onProgressChange() {
     this._updateDownloadStatusUI();
   },
   /* nsIController */
   isCommandEnabled: function DES_isCommandEnabled(aCommand) {
     // The only valid command for inactive elements is cmd_delete.
     if (!this.active && aCommand != "cmd_delete")
       return false;
     switch (aCommand) {
       case "downloadsCmd_open": {
         // We cannot open a session dowload file unless it's done ("openable").
         // If it's finished, we need to make sure the file was not removed,
         // as we do for past downloads.
         if (this._dataItem && !this._dataItem.openable)
           return false;
         if (this._targetFileInfoFetched)
           return this._targetFileExists;
         // If the target file information is not yet fetched,
         // temporarily assume that the file is in place.
         return this.getDownloadMetaData().state == nsIDM.DOWNLOAD_FINISHED;
       }
       case "downloadsCmd_show": {
         // TODO: Bug 827010 - Handle part-file asynchronously.
         if (this._dataItem &&
             this._dataItem.partFile && this._dataItem.partFile.exists())
           return true;
         if (this._targetFileInfoFetched)
           return this._targetFileExists;
         // If the target file information is not yet fetched,
         // temporarily assume that the file is in place.
         return this.getDownloadMetaData().state == nsIDM.DOWNLOAD_FINISHED;
       }
       case "downloadsCmd_pauseResume":
         return this._dataItem && this._dataItem.inProgress && this._dataItem.resumable;
       case "downloadsCmd_retry":
         // An history download can always be retried.
         return !this._dataItem || this._dataItem.canRetry;
       case "downloadsCmd_openReferrer":
         return this._dataItem && !!this._dataItem.referrer;
       case "cmd_delete":
         // The behavior in this case is somewhat unexpected, so we disallow that.
         if (this._placesNode && this._dataItem && this._dataItem.inProgress)
           return false;
         return true;
       case "downloadsCmd_cancel":
         return this._dataItem != null;
     }
     return false;
   },
   _retryAsHistoryDownload: function DES__retryAsHistoryDownload() {
     // In future we may try to download into the same original target uri, when
     // we have it.  Though that requires verifying the path is still valid and
     // may surprise the user if he wants to be requested every time.
     let browserWin = RecentWindow.getMostRecentBrowserWindow();
     let initiatingDoc = browserWin ? browserWin.document : document;
     DownloadURL(this.downloadURI, this.getDownloadMetaData().fileName,
                 initiatingDoc);
   },
   /* nsIController */
   doCommand: function DES_doCommand(aCommand) {
     switch (aCommand) {
       case "downloadsCmd_open": {
         let file = this._dataItem ?
           this.dataItem.localFile :
           new FileUtils.File(this.getDownloadMetaData().filePath);
         DownloadsCommon.openDownloadedFile(file, null, window);
         break;
       }
       case "downloadsCmd_show": {
         if (this._dataItem) {
           this._dataItem.showLocalFile();
         }
         else {
           let file = new FileUtils.File(this.getDownloadMetaData().filePath);
           DownloadsCommon.showDownloadedFile(file);
         }
         break;
       }
       case "downloadsCmd_openReferrer": {
         openURL(this._dataItem.referrer);
         break;
       }
       case "downloadsCmd_cancel": {
         this._dataItem.cancel();
         break;
       }
       case "cmd_delete": {
         if (this._dataItem)
           this._dataItem.remove();
         if (this._placesNode)
           PlacesUtils.bhistory.removePage(this._downloadURIObj);
         break;
        }
       case "downloadsCmd_retry": {
         if (this._dataItem)
           this._dataItem.retry();
         else
           this._retryAsHistoryDownload();
         break;
       }
       case "downloadsCmd_pauseResume": {
         this._dataItem.togglePauseResume();
         break;
       }
     }
   },
   // Returns whether or not the download handled by this shell should
   // show up in the search results for the given term.  Both the display
   // name for the download and the url are searched.
   matchesSearchTerm: function DES_matchesSearchTerm(aTerm) {
     if (!aTerm)
       return true;
     aTerm = aTerm.toLowerCase();
     return this.getDownloadMetaData().displayName.toLowerCase().contains(aTerm) ||
            this.downloadURI.toLowerCase().contains(aTerm);
   },
   // Handles return kepress on the element (the keypress listener is
   // set in the DownloadsPlacesView object).
   doDefaultCommand: function DES_doDefaultCommand() {
     function getDefaultCommandForState(aState) {
       switch (aState) {
         case nsIDM.DOWNLOAD_FINISHED:
           return "downloadsCmd_open";
         case nsIDM.DOWNLOAD_PAUSED:
           return "downloadsCmd_pauseResume";
         case nsIDM.DOWNLOAD_NOTSTARTED:
         case nsIDM.DOWNLOAD_QUEUED:
           return "downloadsCmd_cancel";
         case nsIDM.DOWNLOAD_FAILED:
         case nsIDM.DOWNLOAD_CANCELED:
           return "downloadsCmd_retry";
         case nsIDM.DOWNLOAD_SCANNING:
           return "downloadsCmd_show";
         case nsIDM.DOWNLOAD_BLOCKED_PARENTAL:
         case nsIDM.DOWNLOAD_DIRTY:
         case nsIDM.DOWNLOAD_BLOCKED_POLICY:
           return "downloadsCmd_openReferrer";
       }
       return "";
     }
     let command = getDefaultCommandForState(this.getDownloadMetaData().state);
     if (command && this.isCommandEnabled(command))
       this.doCommand(command);
   },
   /**
    * At the first time an item is selected, we don't yet have
    * the target file information.  Thus the call to goUpdateDownloadCommands
    * in DPV_onSelect would result in best-guess enabled/disabled result.
    * That way we let the user perform command immediately. However, once
    * we have the target file information, we can update the commands
    * appropriately (_fetchTargetFileInfo() calls goUpdateDownloadCommands).
    */
   onSelect: function DES_onSelect() {
     if (!this.active)
       return;
     if (!this._targetFileInfoFetched)
       this._fetchTargetFileInfo();
   }
 };
 /**
  * A Downloads Places View is a places view designed to show a places query
  * for history donwloads alongside the current "session"-downloads.
  *
  * As we don't use the places controller, some methods implemented by other
  * places views are not implemented by this view.
  *
  * A richlistitem in this view can represent either a past download or a session
  * download, or both. Session downloads are shown first in the view, and as long
  * as they exist they "collapses" their history "counterpart" (So we don't show two
  * items for every download).
  */
 function DownloadsPlacesView(aRichListBox, aActive = true) {
   this._richlistbox = aRichListBox;
   this._richlistbox._placesView = this;
   window.controllers.insertControllerAt(0, this);
   // Map download URLs to download element shells regardless of their type
   this._downloadElementsShellsForURI = new Map();
   // Map download data items to their element shells.
   this._viewItemsForDataItems = new WeakMap();
   // Points to the last session download element. We keep track of this
   // in order to keep all session downloads above past downloads.
   this._lastSessionDownloadElement = null;
   this._searchTerm = "";
   this._active = aActive;
   // Register as a downloads view. The places data will be initialized by
   // the places setter.
   this._initiallySelectedElement = null;
   this._downloadsData = DownloadsCommon.getData(window.opener || window);
   this._downloadsData.addView(this);
   // Get the Download button out of the attention state since we're about to
   // view all downloads.
   DownloadsCommon.getIndicatorData(window).attention = false;
   // Make sure to unregister the view if the window is closed.
   window.addEventListener("unload", function() {
     window.controllers.removeController(this);
     this._downloadsData.removeView(this);
     this.result = null;
   }.bind(this), true);
   // Resizing the window may change items visibility.
   window.addEventListener("resize", function() {
     this._ensureVisibleElementsAreActive();
   }.bind(this), true);
 }
 DownloadsPlacesView.prototype = {
   get associatedElement() this._richlistbox,
   get active() this._active,
   set active(val) {
     this._active = val;
     if (this._active)
       this._ensureVisibleElementsAreActive();
     return this._active;
   },
   _forEachDownloadElementShellForURI:
   function DPV__forEachDownloadElementShellForURI(aURI, aCallback) {
     if (this._downloadElementsShellsForURI.has(aURI)) {
       let downloadElementShells = this._downloadElementsShellsForURI.get(aURI);
       for (let des of downloadElementShells) {
         aCallback(des);
       }
     }
   },
   _getAnnotationsFor: function DPV_getAnnotationsFor(aURI) {
     if (!this._cachedAnnotations) {
       this._cachedAnnotations = new Map();
       for (let name of [ DESTINATION_FILE_URI_ANNO,
                          DOWNLOAD_META_DATA_ANNO ]) {
         let results = PlacesUtils.annotations.getAnnotationsWithName(name);
         for (let result of results) {
           let url = result.uri.spec;
           if (!this._cachedAnnotations.has(url))
             this._cachedAnnotations.set(url, new Map());
           let m = this._cachedAnnotations.get(url);
           m.set(result.annotationName, result.annotationValue);
         }
       }
     }
     let annotations = this._cachedAnnotations.get(aURI);
     if (!annotations) {
       // There are no annotations for this entry, that means it is quite old.
       // Make up a fake annotations entry with default values.
       annotations = new Map();
       annotations.set(DESTINATION_FILE_URI_ANNO, NOT_AVAILABLE);
     }
     // The meta-data annotation has been added recently, so it's likely missing.
     if (!annotations.has(DOWNLOAD_META_DATA_ANNO)) {
       annotations.set(DOWNLOAD_META_DATA_ANNO, NOT_AVAILABLE);
     }
     return annotations;
   },
   /**
    * Given a data item for a session download, or a places node for a past
    * download, updates the view as necessary.
    *  1. If the given data is a places node, we check whether there are any
    *     elements for the same download url. If there are, then we just reset
    *     their places node. Otherwise we add a new download element.
    *  2. If the given data is a data item, we first check if there's a history
    *     download in the list that is not associated with a data item. If we
    *     found one, we use it for the data item as well and reposition it
    *     alongside the other session downloads. If we don't, then we go ahead
    *     and create a new element for the download.
    *
    * @param aDataItem
    *        The data item of a session download. Set to null for history
    *        downloads data.
    * @param [optional] aPlacesNode
    *        The places node for a history download. Required if there's no data
    *        item.
    * @param [optional] aNewest
    *        @see onDataItemAdded. Ignored for history downlods.
    * @param [optional] aDocumentFragment
    *        To speed up the appending of multiple elements to the end of the
    *        list which are coming in a single batch (i.e. invalidateContainer),
    *        a document fragment may be passed to which the new elements would
    *        be appended. It's the caller's job to ensure the fragment is merged
    *        to the richlistbox at the end.
    */
   _addDownloadData:
   function DPV_addDownloadData(aDataItem, aPlacesNode, aNewest = false,
                                aDocumentFragment = null) {
     let downloadURI = aPlacesNode ? aPlacesNode.uri : aDataItem.uri;
     let shellsForURI = this._downloadElementsShellsForURI.get(downloadURI);
     if (!shellsForURI) {
       shellsForURI = new Set();
       this._downloadElementsShellsForURI.set(downloadURI, shellsForURI);
     }
     let newOrUpdatedShell = null;
     // Trivial: if there are no shells for this download URI, we always
     // need to create one.
     let shouldCreateShell = shellsForURI.size == 0;
     // However, if we do have shells for this download uri, there are
     // few options:
     // 1) There's only one shell and it's for a history download (it has
     //    no data item). In this case, we update this shell and move it
     //    if necessary
     // 2) There are multiple shells, indicicating multiple downloads for
     //    the same download uri are running. In this case we create
     //    anoter shell for the download (so we have one shell for each data
     //    item).
     //
     // Note: If a cancelled session download is already in the list, and the
     // download is retired, onDataItemAdded is called again for the same
     // data item. Thus, we also check that we make sure we don't have a view item
     // already.
     if (!shouldCreateShell &&
         aDataItem && this.getViewItem(aDataItem) == null) {
       // If there's a past-download-only shell for this download-uri with no
       // associated data item, use it for the new data item. Otherwise, go ahead
       // and create another shell.
       shouldCreateShell = true;
       for (let shell of shellsForURI) {
         if (!shell.dataItem) {
           shouldCreateShell = false;
           shell.dataItem = aDataItem;
           newOrUpdatedShell = shell;
           this._viewItemsForDataItems.set(aDataItem, shell);
           break;
         }
       }
     }
     if (shouldCreateShell) {
       // Bug 836271: The annotations for a url should be cached only when the
       // places node is available, i.e. when we know we we'd be notified for
       // annoation changes.
       // Otherwise we may cache NOT_AVILABLE values first for a given session
       // download, and later use these NOT_AVILABLE values when a history
       // download for the same URL is added.
       let cachedAnnotations = aPlacesNode ? this._getAnnotationsFor(downloadURI) : null;
       let shell = new DownloadElementShell(aDataItem, aPlacesNode, cachedAnnotations);
       newOrUpdatedShell = shell;
       shellsForURI.add(shell);
       if (aDataItem)
         this._viewItemsForDataItems.set(aDataItem, shell);
     }
     else if (aPlacesNode) {
       for (let shell of shellsForURI) {
         if (shell.placesNode != aPlacesNode)
           shell.placesNode = aPlacesNode;
       }
     }
     if (newOrUpdatedShell) {
       if (aNewest) {
         this._richlistbox.insertBefore(newOrUpdatedShell.element,
                                        this._richlistbox.firstChild);
         if (!this._lastSessionDownloadElement) {
           this._lastSessionDownloadElement = newOrUpdatedShell.element;
         }
         // Some operations like retrying an history download move an element to
         // the top of the richlistbox, along with other session downloads.
         // More generally, if a new download is added, should be made visible.
         this._richlistbox.ensureElementIsVisible(newOrUpdatedShell.element);
       }
       else if (aDataItem) {
         let before = this._lastSessionDownloadElement ?
           this._lastSessionDownloadElement.nextSibling : this._richlistbox.firstChild;
         this._richlistbox.insertBefore(newOrUpdatedShell.element, before);
         this._lastSessionDownloadElement = newOrUpdatedShell.element;
       }
       else {
         let appendTo = aDocumentFragment || this._richlistbox;
         appendTo.appendChild(newOrUpdatedShell.element);
       }
       if (this.searchTerm) {
         newOrUpdatedShell.element.hidden =
           !newOrUpdatedShell.element._shell.matchesSearchTerm(this.searchTerm);
       }
     }
     // If aDocumentFragment is defined this is a batch change, so it's up to
     // the caller to append the fragment and activate the visible shells.
     if (!aDocumentFragment) {
       this._ensureVisibleElementsAreActive();
       goUpdateCommand("downloadsCmd_clearDownloads");
     }
   },
   _removeElement: function DPV__removeElement(aElement) {
     // If the element was selected exclusively, select its next
     // sibling first, if not, try for previous sibling, if any.
     if ((aElement.nextSibling || aElement.previousSibling) &&
         this._richlistbox.selectedItems &&
         this._richlistbox.selectedItems.length == 1 &&
         this._richlistbox.selectedItems[0] == aElement) {
       this._richlistbox.selectItem(aElement.nextSibling ||
                                    aElement.previousSibling);
     }
     if (this._lastSessionDownloadElement == aElement)
       this._lastSessionDownloadElement = aElement.previousSibling;
     this._richlistbox.removeItemFromSelection(aElement);
     this._richlistbox.removeChild(aElement);
     this._ensureVisibleElementsAreActive();
     goUpdateCommand("downloadsCmd_clearDownloads");
   },
   _removeHistoryDownloadFromView:
   function DPV__removeHistoryDownloadFromView(aPlacesNode) {
     let downloadURI = aPlacesNode.uri;
     let shellsForURI = this._downloadElementsShellsForURI.get(downloadURI);
     if (shellsForURI) {
       for (let shell of shellsForURI) {
         if (shell.dataItem) {
           shell.placesNode = null;
         }
         else {
           this._removeElement(shell.element);
           shellsForURI.delete(shell);
           if (shellsForURI.size == 0)
             this._downloadElementsShellsForURI.delete(downloadURI);
         }
       }
     }
   },
   _removeSessionDownloadFromView:
   function DPV__removeSessionDownloadFromView(aDataItem) {
     let shells = this._downloadElementsShellsForURI.get(aDataItem.uri);
     if (shells.size == 0)
       throw new Error("Should have had at leaat one shell for this uri");
     let shell = this.getViewItem(aDataItem);
     if (!shells.has(shell))
       throw new Error("Missing download element shell in shells list for url");
     // If there's more than one item for this download uri, we can let the
     // view item for this this particular data item go away.
     // If there's only one item for this download uri, we should only
     // keep it if it is associated with a history download.
     if (shells.size > 1 || !shell.placesNode) {
       this._removeElement(shell.element);
       shells.delete(shell);
       if (shells.size == 0)
         this._downloadElementsShellsForURI.delete(aDataItem.uri);
     }
     else {
       shell.dataItem = null;
       // Move it below the session-download items;
       if (this._lastSessionDownloadElement == shell.element) {
         this._lastSessionDownloadElement = shell.element.previousSibling;
       }
       else {
         let before = this._lastSessionDownloadElement ?
           this._lastSessionDownloadElement.nextSibling : this._richlistbox.firstChild;
         this._richlistbox.insertBefore(shell.element, before);
       }
     }
   },
   _ensureVisibleElementsAreActive:
   function DPV__ensureVisibleElementsAreActive() {
     if (!this.active || this._ensureVisibleTimer || !this._richlistbox.firstChild)
       return;
     this._ensureVisibleTimer = setTimeout(function() {
       delete this._ensureVisibleTimer;
       if (!this._richlistbox.firstChild)
         return;
       let rlbRect = this._richlistbox.getBoundingClientRect();
       let winUtils = window.QueryInterface(Ci.nsIInterfaceRequestor)
                            .getInterface(Ci.nsIDOMWindowUtils);
       let nodes = winUtils.nodesFromRect(rlbRect.left, rlbRect.top,
 , rlbRect.width, rlbRect.height, 0,
                                          true, false);
       // nodesFromRect returns nodes in z-index order, and for the same z-index
       // sorts them in inverted DOM order, thus starting from the one that would
       // be on top.
       let firstVisibleNode, lastVisibleNode;
       for (let node of nodes) {
         if (node.localName === "richlistitem" && node._shell) {
           node._shell.ensureActive();
           // The first visible node is the last match.
           firstVisibleNode = node;
           // While the last visible node is the first match.
           if (!lastVisibleNode)
             lastVisibleNode = node;
         }
       }
       // Also activate the first invisible nodes in both boundaries (that is,
       // above and below the visible area) to ensure proper keyboard navigation
       // in both directions.
       let nodeBelowVisibleArea = lastVisibleNode && lastVisibleNode.nextSibling;
       if (nodeBelowVisibleArea && nodeBelowVisibleArea._shell)
         nodeBelowVisibleArea._shell.ensureActive();
       let nodeABoveVisibleArea =
         firstVisibleNode && firstVisibleNode.previousSibling;
       if (nodeABoveVisibleArea && nodeABoveVisibleArea._shell)
         nodeABoveVisibleArea._shell.ensureActive();
     }.bind(this), 10);
   },
   _place: "",
   get place() this._place,
   set place(val) {
     // Don't reload everything if we don't have to.
     if (this._place == val) {
       // XXXmano: places.js relies on this behavior (see Bug 822203).
       this.searchTerm = "";
       return val;
     }
     this._place = val;
     let history = PlacesUtils.history;
     let queries = { }, options = { };
     history.queryStringToQueries(val, queries, { }, options);
     if (!queries.value.length)
       queries.value = [history.getNewQuery()];
     let result = history.executeQueries(queries.value, queries.value.length,
                                         options.value);
     result.addObserver(this, false);
     return val;
   },
   _result: null,
   get result() this._result,
   set result(val) {
     if (this._result == val)
       return val;
     if (this._result) {
       this._result.removeObserver(this);
       this._resultNode.containerOpen = false;
     }
     if (val) {
       this._result = val;
       this._resultNode = val.root;
       this._resultNode.containerOpen = true;
       this._ensureInitialSelection();
     }
     else {
       delete this._resultNode;
       delete this._result;
     }
     return val;
   },
   get selectedNodes() {
     let placesNodes = [];
     let selectedElements = this._richlistbox.selectedItems;
     for (let elt of selectedElements) {
       if (elt._shell.placesNode)
         placesNodes.push(elt._shell.placesNode);
     }
     return placesNodes;
   },
   get selectedNode() {
     let selectedNodes = this.selectedNodes;
     return selectedNodes.length == 1 ? selectedNodes[0] : null;
   },
   get hasSelection() this.selectedNodes.length > 0,
   containerStateChanged:
   function DPV_containerStateChanged(aNode, aOldState, aNewState) {
     this.invalidateContainer(aNode)
   },
   invalidateContainer:
   function DPV_invalidateContainer(aContainer) {
     if (aContainer != this._resultNode)
       throw new Error("Unexpected container node");
     if (!aContainer.containerOpen)
       throw new Error("Root container for the downloads query cannot be closed");
     let suppressOnSelect = this._richlistbox.suppressOnSelect;
     this._richlistbox.suppressOnSelect = true;
     try {
       // Remove the invalidated history downloads from the list and unset the
       // places node for data downloads.
       // Loop backwards since _removeHistoryDownloadFromView may removeChild().
       for (let i = this._richlistbox.childNodes.length - 1; i >= 0; --i) {
         let element = this._richlistbox.childNodes[i];
         if (element._shell.placesNode)
           this._removeHistoryDownloadFromView(element._shell.placesNode);
       }
     }
     finally {
       this._richlistbox.suppressOnSelect = suppressOnSelect;
     }
     if (aContainer.childCount > 0) {
       let elementsToAppendFragment = document.createDocumentFragment();
       for (let i = 0; i < aContainer.childCount; i++) {
         try {
           this._addDownloadData(null, aContainer.getChild(i), false,
                                 elementsToAppendFragment);
         }
         catch(ex) {
           Cu.reportError(ex);
         }
       }
       // _addDownloadData may not add new elements if there were already
       // data items in place.
       if (elementsToAppendFragment.firstChild) {
         this._appendDownloadsFragment(elementsToAppendFragment);
         this._ensureVisibleElementsAreActive();
       }
     }
     goUpdateDownloadCommands();
   },
   _appendDownloadsFragment: function DPV__appendDownloadsFragment(aDOMFragment) {
     // Workaround multiple reflows hang by removing the richlistbox
     // and adding it back when we're done.
     // Hack for bug 836283: reset xbl fields to their old values after the
     // binding is reattached to avoid breaking the selection state
     let xblFields = new Map();
     for (let [key, value] in Iterator(this._richlistbox)) {
       xblFields.set(key, value);
     }
     let parentNode = this._richlistbox.parentNode;
     let nextSibling = this._richlistbox.nextSibling;
     parentNode.removeChild(this._richlistbox);
     this._richlistbox.appendChild(aDOMFragment);
     parentNode.insertBefore(this._richlistbox, nextSibling);
     for (let [key, value] of xblFields) {
       this._richlistbox[key] = value;
     }
   },
   nodeInserted: function DPV_nodeInserted(aParent, aPlacesNode) {
     this._addDownloadData(null, aPlacesNode);
   },
   nodeRemoved: function DPV_nodeRemoved(aParent, aPlacesNode, aOldIndex) {
     this._removeHistoryDownloadFromView(aPlacesNode);
   },
   nodeIconChanged: function DPV_nodeIconChanged(aNode) {
     this._forEachDownloadElementShellForURI(aNode.uri, function(aDownloadElementShell) {
       aDownloadElementShell.placesNodeIconChanged();
     });
   },
   nodeAnnotationChanged: function DPV_nodeAnnotationChanged(aNode, aAnnoName) {
     this._forEachDownloadElementShellForURI(aNode.uri, function(aDownloadElementShell) {
       aDownloadElementShell.placesNodeAnnotationChanged(aAnnoName);
     });
   },
   nodeTitleChanged: function DPV_nodeTitleChanged(aNode, aNewTitle) {
     this._forEachDownloadElementShellForURI(aNode.uri, function(aDownloadElementShell) {
       aDownloadElementShell.placesNodeTitleChanged();
     });
   },
   nodeKeywordChanged: function() {},
   nodeDateAddedChanged: function() {},
   nodeLastModifiedChanged: function() {},
   nodeHistoryDetailsChanged: function() {},
   nodeTagsChanged: function() {},
   sortingChanged: function() {},
   nodeMoved: function() {},
   nodeURIChanged: function() {},
   batching: function() {},
   get controller() this._richlistbox.controller,
   get searchTerm() this._searchTerm,
   set searchTerm(aValue) {
     if (this._searchTerm != aValue) {
       for (let element of this._richlistbox.childNodes) {
         element.hidden = !element._shell.matchesSearchTerm(aValue);
       }
       this._ensureVisibleElementsAreActive();
     }
     return this._searchTerm = aValue;
   },
   /**
    * When the view loads, we want to select the first item.
    * However, because session downloads, for which the data is loaded
    * asynchronously, always come first in the list, and because the list
    * may (or may not) already contain history downloads at that point, it
    * turns out that by the time we can select the first item, the user may
    * have already started using the view.
    * To make things even more complicated, in other cases, the places data
    * may be loaded after the session downloads data.  Thus we cannot rely on
    * the order in which the data comes in.
    * We work around this by attempting to select the first element twice,
    * once after the places data is loaded and once when the session downloads
    * data is done loading.  However, if the selection has changed in-between,
    * we assume the user has already started using the view and give up.
    */
   _ensureInitialSelection: function DPV__ensureInitialSelection() {
     // Either they're both null, or the selection has not changed in between.
     if (this._richlistbox.selectedItem == this._initiallySelectedElement) {
       let firstDownloadElement = this._richlistbox.firstChild;
       if (firstDownloadElement != this._initiallySelectedElement) {
         // We may be called before _ensureVisibleElementsAreActive,
         // or before the download binding is attached. Therefore, ensure the
         // first item is activated, and pass the item to the richlistbox
         // setters only at a point we know for sure the binding is attached.
         firstDownloadElement._shell.ensureActive();
         Services.tm.mainThread.dispatch(function() {
           this._richlistbox.selectedItem = firstDownloadElement;
           this._richlistbox.currentItem = firstDownloadElement;
           this._initiallySelectedElement = firstDownloadElement;
         }.bind(this), Ci.nsIThread.DISPATCH_NORMAL);
       }
     }
   },
   onDataLoadStarting: function() { },
   onDataLoadCompleted: function DPV_onDataLoadCompleted() {
     this._ensureInitialSelection();
   },
   onDataItemAdded: function DPV_onDataItemAdded(aDataItem, aNewest) {
     this._addDownloadData(aDataItem, null, aNewest);
   },
   onDataItemRemoved: function DPV_onDataItemRemoved(aDataItem) {
     this._removeSessionDownloadFromView(aDataItem);
   },
   getViewItem: function(aDataItem)
     this._viewItemsForDataItems.get(aDataItem, null),
   supportsCommand: function DPV_supportsCommand(aCommand) {
     if (DOWNLOAD_VIEW_SUPPORTED_COMMANDS.indexOf(aCommand) != -1) {
       // The clear-downloads command may be performed by the toolbar-button,
       // which can be focused on OS X.  Thus enable this command even if the
       // richlistbox is not focused.
       // For other commands, be prudent and disable them unless the richlistview
       // is focused. It's important to make the decision here rather than in
       // isCommandEnabled.  Otherwise our controller may "steal" commands from
       // other controls in the window (see goUpdateCommand &
       // getControllerForCommand).
       if (document.activeElement == this._richlistbox ||
           aCommand == "downloadsCmd_clearDownloads") {
         return true;
       }
     }
     return false;
   },
   isCommandEnabled: function DPV_isCommandEnabled(aCommand) {
     switch (aCommand) {
       case "cmd_copy":
         return this._richlistbox.selectedItems.length > 0;
       case "cmd_selectAll":
         return true;
       case "cmd_paste":
         return this._canDownloadClipboardURL();
       case "downloadsCmd_clearDownloads":
         return this._canClearDownloads();
       default:
         return Array.every(this._richlistbox.selectedItems, function(element) {
           return element._shell.isCommandEnabled(aCommand);
         });
     }
   },
   _canClearDownloads: function DPV__canClearDownloads() {
     // Downloads can be cleared if there's at least one removeable download in
     // the list (either a history download or a completed session download).
     // Because history downloads are always removable and are listed after the
     // session downloads, check from bottom to top.
     for (let elt = this._richlistbox.lastChild; elt; elt = elt.previousSibling) {
       if (elt._shell.placesNode || !elt._shell.dataItem.inProgress)
         return true;
     }
     return false;
   },
   _copySelectedDownloadsToClipboard:
   function DPV__copySelectedDownloadsToClipboard() {
     let selectedElements = this._richlistbox.selectedItems;
     let urls = [e._shell.downloadURI for each (e in selectedElements)];
     Cc["@mozilla.org/widget/clipboardhelper;1"].
     getService(Ci.nsIClipboardHelper).copyString(urls.join("\n"), document);
   },
   _getURLFromClipboardData: function DPV__getURLFromClipboardData() {
     let trans = Cc["@mozilla.org/widget/transferable;1"].
                 createInstance(Ci.nsITransferable);
     trans.init(null);
     let flavors = ["text/x-moz-url", "text/unicode"];
     flavors.forEach(trans.addDataFlavor);
     Services.clipboard.getData(trans, Services.clipboard.kGlobalClipboard);
     // Getting the data or creating the nsIURI might fail.
     try {
       let data = {};
       trans.getAnyTransferData({}, data, {});
       let [url, name] = data.value.QueryInterface(Ci.nsISupportsString)
                             .data.split("\n");
       if (url)
         return [NetUtil.newURI(url, null, null).spec, name];
     }
     catch(ex) { }
     return ["", ""];
   },
   _canDownloadClipboardURL: function DPV__canDownloadClipboardURL() {
     let [url, name] = this._getURLFromClipboardData();
     return url != "";
   },
   _downloadURLFromClipboard: function DPV__downloadURLFromClipboard() {
     let [url, name] = this._getURLFromClipboardData();
     let browserWin = RecentWindow.getMostRecentBrowserWindow();
     let initiatingDoc = browserWin ? browserWin.document : document;
     DownloadURL(url, name, initiatingDoc);
   },
   doCommand: function DPV_doCommand(aCommand) {
     switch (aCommand) {
       case "cmd_copy":
         this._copySelectedDownloadsToClipboard();
         break;
       case "cmd_selectAll":
         this._richlistbox.selectAll();
         break;
       case "cmd_paste":
         this._downloadURLFromClipboard();
         break;
       case "downloadsCmd_clearDownloads":
         this._downloadsData.removeFinished();
         if (this.result) {
           Cc["@mozilla.org/browser/download-history;1"]
             .getService(Ci.nsIDownloadHistory)
             .removeAllDownloads();
         }
         // There may be no selection or focus change as a result
         // of these change, and we want the command updated immediately.
         goUpdateCommand("downloadsCmd_clearDownloads");
         break;
       default: {
         // Slicing the array to get a freezed list of selected items. Otherwise,
         // the selectedItems array is live and doCommand may alter the selection
         // while we are trying to do one particular action, like removing items
         // from history.
         let selectedElements = this._richlistbox.selectedItems.slice();
         for (let element of selectedElements) {
           element._shell.doCommand(aCommand);
         }
       }
     }
   },
   onEvent: function() { },
   onContextMenu: function DPV_onContextMenu(aEvent)
   {
     let element = this._richlistbox.selectedItem;
     if (!element || !element._shell)
       return false;
     // Set the state attribute so that only the appropriate items are displayed.
     let contextMenu = document.getElementById("downloadsContextMenu");
     let state = element._shell.getDownloadMetaData().state;
     if (state !== undefined)
       contextMenu.setAttribute("state", state);
     else
       contextMenu.removeAttribute("state");
     if (state == nsIDM.DOWNLOAD_DOWNLOADING) {
       // The resumable property of a download may change at any time, so
       // ensure we update the related command now.
       goUpdateCommand("downloadsCmd_pauseResume");
     }
     return true;
   },
   onKeyPress: function DPV_onKeyPress(aEvent) {
     let selectedElements = this._richlistbox.selectedItems;
     if (aEvent.keyCode == KeyEvent.DOM_VK_RETURN) {
       // In the content tree, opening bookmarks by pressing return is only
       // supported when a single item is selected. To be consistent, do the
       // same here.
       if (selectedElements.length == 1) {
         let element = selectedElements[0];
         if (element._shell)
           element._shell.doDefaultCommand();
       }
     }
     else if (aEvent.charCode == " ".charCodeAt(0)) {
       // Pausue/Resume every selected download
       for (let element of selectedElements) {
         if (element._shell.isCommandEnabled("downloadsCmd_pauseResume"))
           element._shell.doCommand("downloadsCmd_pauseResume");
       }
     }
   },
   onDoubleClick: function DPV_onDoubleClick(aEvent) {
     if (aEvent.button != 0)
       return;
     let selectedElements = this._richlistbox.selectedItems;
     if (selectedElements.length != 1)
       return;
     let element = selectedElements[0];
     if (element._shell)
       element._shell.doDefaultCommand();
   },
   onScroll: function DPV_onScroll() {
     this._ensureVisibleElementsAreActive();
   },
   onSelect: function DPV_onSelect() {
     goUpdateDownloadCommands();
     let selectedElements = this._richlistbox.selectedItems;
     for (let elt of selectedElements) {
       if (elt._shell)
         elt._shell.onSelect();
     }
   },
   onDragStart: function DPV_onDragStart(aEvent) {
     // TODO Bug 831358: Support d&d for multiple selection.
     // For now, we just drag the first element.
     let selectedItem = this._richlistbox.selectedItem;
     if (!selectedItem)
       return;
     let metaData = selectedItem._shell.getDownloadMetaData();
     if (!("filePath" in metaData))
       return;
     let file = new FileUtils.File(metaData.filePath);
     if (!file.exists())
       return;
     let dt = aEvent.dataTransfer;
     dt.mozSetDataAt("application/x-moz-file", file, 0);
     let url = Services.io.newFileURI(file).spec;
     dt.setData("text/uri-list", url);
     dt.setData("text/plain", url);
     dt.effectAllowed = "copyMove";
     dt.addElement(selectedItem);
   },
   onDragOver: function DPV_onDragOver(aEvent) {
     let types = aEvent.dataTransfer.types;
     if (types.contains("text/uri-list") ||
         types.contains("text/x-moz-url") ||
         types.contains("text/plain")) {
       aEvent.preventDefault();
     }
   },
   onDrop: function DPV_onDrop(aEvent) {
     let dt = aEvent.dataTransfer;
     // If dragged item is from our source, do not try to
     // redownload already downloaded file.
     if (dt.mozGetDataAt("application/x-moz-file", 0))
       return;
     let name = { };
     let url = Services.droppedLinkHandler.dropLink(aEvent, name);
     if (url) {
       let browserWin = RecentWindow.getMostRecentBrowserWindow();
       let initiatingDoc = browserWin ? browserWin.document : document;
       DownloadURL(url, name.value, initiatingDoc);
     }
   }
 };
 for (let methodName of ["load", "applyFilter", "selectNode", "selectItems"]) {
   DownloadsPlacesView.prototype[methodName] = function() {
     throw new Error("|" + methodName + "| is not implemented by the downloads view.");
   }
 }
 function goUpdateDownloadCommands() {
   for (let command of DOWNLOAD_VIEW_SUPPORTED_COMMANDS) {
     goUpdateCommand(command);
   }
 }