gecko/toolkit/mozapps/downloads/DownloadTaskbarProgress.jsm

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/* -*- Mode: JavaScript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=2 sts=2 et filetype=javascript
* ***** 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 Windows Download Taskbar Progress.
*
* The Initial Developer of the Original Code is
* Siddharth Agarwal <sid.bugzilla@gmail.com>
* Portions created by the Initial Developer are Copyright (C) 2009
* 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 ***** */
let EXPORTED_SYMBOLS = [
"DownloadTaskbarProgress",
];
////////////////////////////////////////////////////////////////////////////////
//// Constants
const Cc = Components.classes;
const Ci = Components.interfaces;
const kTaskbarID = "@mozilla.org/windows-taskbar;1";
////////////////////////////////////////////////////////////////////////////////
//// DownloadTaskbarProgress Object
const DownloadTaskbarProgress =
{
/**
* Called when a browser window appears. This has an effect only when we
* don't already have an active window.
*
* @param aWindow
* The browser window that we'll potentially use to display the
* progress.
*/
onBrowserWindowLoad: function DTP_onBrowserWindowLoad(aWindow)
{
if (!DownloadTaskbarProgressUpdater) {
return;
}
if (!DownloadTaskbarProgressUpdater._activeTaskbarProgress) {
DownloadTaskbarProgressUpdater._setActiveWindow(aWindow, false);
}
},
/**
* Called when the download window appears. The download window will take
* over as the active window.
*/
onDownloadWindowLoad: function DTP_onDownloadWindowLoad(aWindow)
{
if (!DownloadTaskbarProgressUpdater) {
return;
}
DownloadTaskbarProgressUpdater._setActiveWindow(aWindow, true);
},
/**
* Getters for internal DownloadTaskbarProgressUpdater values
*/
get activeTaskbarProgress() {
if (!DownloadTaskbarProgressUpdater) {
return null;
}
return DownloadTaskbarProgressUpdater._activeTaskbarProgress;
},
get activeWindowIsDownloadWindow() {
if (!DownloadTaskbarProgressUpdater) {
return null;
}
return DownloadTaskbarProgressUpdater._activeWindowIsDownloadWindow;
},
get taskbarState() {
if (!DownloadTaskbarProgressUpdater) {
return null;
}
return DownloadTaskbarProgressUpdater._taskbarState;
},
};
////////////////////////////////////////////////////////////////////////////////
//// DownloadTaskbarProgressUpdater Object
var DownloadTaskbarProgressUpdater =
{
/// Reference to the taskbar.
_taskbar: null,
/// Reference to the download manager.
_dm: null,
/**
* Initialize and register ourselves as a download progress listener.
*/
_init: function DTPU_init()
{
if (!(kTaskbarID in Cc)) {
// This means that the component isn't available
DownloadTaskbarProgressUpdater = null;
return;
}
this._taskbar = Cc[kTaskbarID].getService(Ci.nsIWinTaskbar);
if (!this._taskbar.available) {
// The Windows version is probably too old
DownloadTaskbarProgressUpdater = null;
return;
}
this._dm = Cc["@mozilla.org/download-manager;1"].
getService(Ci.nsIDownloadManager);
this._dm.addListener(this);
this._os = Cc["@mozilla.org/observer-service;1"].
getService(Ci.nsIObserverService);
this._os.addObserver(this, "quit-application-granted", false);
this._updateStatus();
// onBrowserWindowLoad/onDownloadWindowLoad are going to set the active
// window, so don't do it here.
},
/**
* Unregisters ourselves as a download progress listener.
*/
_uninit: function DTPU_uninit() {
this._dm.removeListener(this);
this._os.removeObserver(this, "quit-application-granted");
},
/**
* This holds a reference to the taskbar progress for the window we're
* working with. This window would preferably be download window, but can be
* another window if it isn't open.
*/
_activeTaskbarProgress: null,
/// Whether the active window is the download window
_activeWindowIsDownloadWindow: false,
/**
* Sets the active window, and whether it's the download window. This takes
* care of clearing out the previous active window's taskbar item, updating
* the taskbar, and setting an onunload listener.
*
* @param aWindow
* The window to set as active.
* @param aIsDownloadWindow
* Whether this window is a download window.
*/
_setActiveWindow: function DTPU_setActiveWindow(aWindow, aIsDownloadWindow)
{
// Clear out the taskbar for the old active window. (If there was no active
// window, this is a no-op.)
this._clearTaskbar();
this._activeWindowIsDownloadWindow = aIsDownloadWindow;
if (aWindow) {
// Get the taskbar progress for this window
let docShell = aWindow.QueryInterface(Ci.nsIInterfaceRequestor).
getInterface(Ci.nsIWebNavigation).
QueryInterface(Ci.nsIDocShellTreeItem).treeOwner.
QueryInterface(Ci.nsIInterfaceRequestor).
getInterface(Ci.nsIXULWindow).docShell;
let taskbarProgress = this._taskbar.getTaskbarProgress(docShell);
this._activeTaskbarProgress = taskbarProgress;
this._updateTaskbar();
// _onActiveWindowUnload is idempotent, so we don't need to check whether
// we've already set this before or not.
aWindow.addEventListener("unload", function () {
DownloadTaskbarProgressUpdater._onActiveWindowUnload(taskbarProgress);
}, false);
}
else {
this._activeTaskbarProgress = null;
}
},
/// Current state displayed on the active window's taskbar item
_taskbarState: Ci.nsITaskbarProgress.STATE_NO_PROGRESS,
_totalSize: 0,
_totalTransferred: 0,
/**
* Update the active window's taskbar indicator with the current state. There
* are two cases here:
* 1. If the active window is the download window, then we always update
* the taskbar indicator.
* 2. If the active window isn't the download window, then we update only if
* the status is Normal, i.e. one or more downloads are currently
* progressing. If we aren't, then we clear the indicator.
*/
_updateTaskbar: function DTPU_updateTaskbar()
{
if (!this._activeTaskbarProgress) {
return;
}
// If the active window is not the download manager window, set the state
// only if it is Normal
if (this._activeWindowIsDownloadWindow ||
(this._taskbarState == Ci.nsITaskbarProgress.STATE_NORMAL)) {
this._activeTaskbarProgress.setProgressState(this._taskbarState,
this._totalTransferred,
this._totalSize);
}
// Clear any state otherwise
else {
this._clearTaskbar();
}
},
/**
* Clear taskbar state. This is needed:
* - to transfer the indicator off a window before transferring it onto
* another one
* - whenever we don't want to show it for a non-download window.
*/
_clearTaskbar: function DTPU_clearTaskbar()
{
if (this._activeTaskbarProgress) {
this._activeTaskbarProgress.setProgressState(
Ci.nsITaskbarProgress.STATE_NO_PROGRESS
);
}
},
/**
* Update this._taskbarState, this._totalSize and this._totalTransferred.
* This is called when the download manager is initialized or when the
* progress or state of a download changes.
* We compute the number of active and paused downloads, and the total size
* and total amount already transferred across whichever downloads we have
* the data for.
* - If there are no active downloads, then we don't want to show any
* progress.
* - If the number of active downloads is equal to the number of paused
* downloads, then we show a paused indicator if we know the size of at
* least one download, and no indicator if we don't.
* - If the number of active downloads is more than the number of paused
* downloads, then we show a "normal" indicator if we know the size of at
* least one download, and an indeterminate indicator if we don't.
*/
_updateStatus: function DTPU_updateStatus()
{
let numActive = this._dm.activeDownloadCount;
let totalSize = 0, totalTransferred = 0;
if (numActive == 0) {
this._taskbarState = Ci.nsITaskbarProgress.STATE_NO_PROGRESS;
}
else {
let numPaused = 0;
// Enumerate all active downloads
let downloads = this._dm.activeDownloads;
while (downloads.hasMoreElements()) {
let download = downloads.getNext().QueryInterface(Ci.nsIDownload);
// Only set values if we actually know the download size
if (download.percentComplete < 100 && download.size > 0) {
totalSize += download.size;
totalTransferred += download.amountTransferred;
}
// We might need to display a paused state, so track this
if (download.state == this._dm.DOWNLOAD_PAUSED) {
numPaused++;
}
}
// If all downloads are paused, show the progress as paused, unless we
// don't have any information about sizes, in which case we don't
// display anything
if (numActive == numPaused) {
if (totalSize == 0) {
this._taskbarState = Ci.nsITaskbarProgress.STATE_NO_PROGRESS;
totalTransferred = 0;
}
else {
this._taskbarState = Ci.nsITaskbarProgress.STATE_PAUSED;
}
}
// If at least one download is not paused, and we don't have any
// information about download sizes, display an indeterminate indicator
else if (totalSize == 0) {
this._taskbarState = Ci.nsITaskbarProgress.STATE_INDETERMINATE;
totalTransferred = 0;
}
// Otherwise display a normal progress bar
else {
this._taskbarState = Ci.nsITaskbarProgress.STATE_NORMAL;
}
}
this._totalSize = totalSize;
this._totalTransferred = totalTransferred;
},
/**
* Called when a window that at one point has been an active window is
* closed. If this window is currently the active window, we need to look for
* another window and make that our active window.
*
* This function is idempotent, so multiple calls for the same window are not
* a problem.
*
* @param aTaskbarProgress
* The taskbar progress for the window that is being unloaded.
*/
_onActiveWindowUnload: function DTPU_onActiveWindowUnload(aTaskbarProgress)
{
if (this._activeTaskbarProgress == aTaskbarProgress) {
let windowMediator = Cc["@mozilla.org/appshell/window-mediator;1"].
getService(Ci.nsIWindowMediator);
let windows = windowMediator.getEnumerator(null);
let newActiveWindow = null;
if (windows.hasMoreElements()) {
newActiveWindow = windows.getNext().QueryInterface(Ci.nsIDOMWindow);
}
// We aren't ever going to reach this point while the download manager is
// open, so it's safe to assume false for the second operand
this._setActiveWindow(newActiveWindow, false);
}
},
//////////////////////////////////////////////////////////////////////////////
//// nsIDownloadProgressListener
/**
* Update status if a download's progress has changed.
*/
onProgressChange: function DTPU_onProgressChange()
{
this._updateStatus();
this._updateTaskbar();
},
/**
* Update status if a download's state has changed.
*/
onDownloadStateChange: function DTPU_onDownloadStateChange()
{
this._updateStatus();
this._updateTaskbar();
},
onSecurityChange: function() { },
onStateChange: function() { },
observe: function DTPU_observe(aSubject, aTopic, aData) {
if (aTopic == "quit-application-granted") {
this._uninit();
}
}
};
////////////////////////////////////////////////////////////////////////////////
//// Initialization
DownloadTaskbarProgressUpdater._init();