gecko/toolkit/mozapps/downloads/DownloadLastDir.jsm

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/* ***** 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 Download Manager Utility Code.
*
* The Initial Developer of the Original Code is
* Ehsan Akhgari <ehsan.akhgari@gmail.com>.
* Portions created by the Initial Developer are Copyright (C) 2008
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* 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 ***** */
2009-11-23 16:24:13 -08:00
/*
* The behavior implemented by gDownloadLastDir is documented here.
*
* In normal browsing sessions, gDownloadLastDir uses the browser.download.lastDir
* preference to store the last used download directory. The first time the user
* switches into the private browsing mode, the last download directory is
* preserved to the pref value, but if the user switches to another directory
* during the private browsing mode, that directory is not stored in the pref,
* and will be merely kept in memory. When leaving the private browsing mode,
* this in-memory value will be discarded, and the last download directory
* will be reverted to the pref value.
*
* Both the pref and the in-memory value will be cleared when clearing the
* browsing history. This effectively changes the last download directory
* to the default download directory on each platform.
*/
const LAST_DIR_PREF = "browser.download.lastDir";
const PBSVC_CID = "@mozilla.org/privatebrowsing;1";
const nsILocalFile = Components.interfaces.nsILocalFile;
var EXPORTED_SYMBOLS = [ "gDownloadLastDir" ];
let pbSvc = null;
if (PBSVC_CID in Components.classes) {
pbSvc = Components.classes[PBSVC_CID]
.getService(Components.interfaces.nsIPrivateBrowsingService);
}
let prefSvc = Components.classes["@mozilla.org/preferences-service;1"]
.getService(Components.interfaces.nsIPrefBranch);
let observer = {
QueryInterface: function (aIID) {
if (aIID.equals(Components.interfaces.nsIObserver) ||
aIID.equals(Components.interfaces.nsISupports) ||
aIID.equals(Components.interfaces.nsISupportsWeakReference))
return this;
throw Components.results.NS_NOINTERFACE;
},
observe: function (aSubject, aTopic, aData) {
switch (aTopic) {
case "private-browsing":
if (aData == "enter")
gDownloadLastDirFile = readLastDirPref();
else if (aData == "exit")
gDownloadLastDirFile = null;
break;
case "browser:purge-session-history":
gDownloadLastDirFile = null;
if (prefSvc.prefHasUserValue(LAST_DIR_PREF))
prefSvc.clearUserPref(LAST_DIR_PREF);
break;
}
}
};
let os = Components.classes["@mozilla.org/observer-service;1"]
.getService(Components.interfaces.nsIObserverService);
os.addObserver(observer, "private-browsing", true);
os.addObserver(observer, "browser:purge-session-history", true);
function readLastDirPref() {
try {
return prefSvc.getComplexValue(LAST_DIR_PREF, nsILocalFile);
}
catch (e) {
return null;
}
}
let gDownloadLastDirFile = readLastDirPref();
let gDownloadLastDir = {
get file() {
if (gDownloadLastDirFile && !gDownloadLastDirFile.exists())
gDownloadLastDirFile = null;
if (pbSvc && pbSvc.privateBrowsingEnabled)
return gDownloadLastDirFile;
else
return readLastDirPref();
},
set file(val) {
if (pbSvc && pbSvc.privateBrowsingEnabled) {
if (val instanceof Components.interfaces.nsIFile)
gDownloadLastDirFile = val.clone();
else
gDownloadLastDirFile = null;
} else {
if (val instanceof Components.interfaces.nsIFile)
prefSvc.setComplexValue(LAST_DIR_PREF, nsILocalFile, val);
else if (prefSvc.prefHasUserValue(LAST_DIR_PREF))
prefSvc.clearUserPref(LAST_DIR_PREF);
}
}
};