gecko/toolkit/mozapps/downloads/DownloadTaskbarProgress.jsm

398 lines
13 KiB
JavaScript

/* -*- Mode: JavaScript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=2 sts=2 et filetype=javascript
* 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/. */
this.EXPORTED_SYMBOLS = [
"DownloadTaskbarProgress",
];
////////////////////////////////////////////////////////////////////////////////
//// Constants
const Cc = Components.classes;
const Ci = Components.interfaces;
const kTaskbarIDWin = "@mozilla.org/windows-taskbar;1";
const kTaskbarIDMac = "@mozilla.org/widget/macdocksupport;1";
////////////////////////////////////////////////////////////////////////////////
//// DownloadTaskbarProgress Object
this.DownloadTaskbarProgress =
{
init: function DTP_init()
{
if (DownloadTaskbarProgressUpdater) {
DownloadTaskbarProgressUpdater._init();
}
},
/**
* 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)
{
this.init();
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 =
{
/// Whether the taskbar is initialized.
_initialized: false,
/// 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 (this._initialized) {
return; // Already initialized
}
this._initialized = true;
if (kTaskbarIDWin in Cc) {
this._taskbar = Cc[kTaskbarIDWin].getService(Ci.nsIWinTaskbar);
if (!this._taskbar.available) {
// The Windows version is probably too old
DownloadTaskbarProgressUpdater = null;
return;
}
} else if (kTaskbarIDMac in Cc) {
this._activeTaskbarProgress = Cc[kTaskbarIDMac].
getService(Ci.nsITaskbarProgress);
} else {
DownloadTaskbarProgressUpdater = null;
return;
}
this._taskbarState = Ci.nsITaskbarProgress.STATE_NO_PROGRESS;
this._dm = Cc["@mozilla.org/download-manager;1"].
getService(Ci.nsIDownloadManager);
this._dm.addPrivacyAwareListener(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._activeTaskbarProgress = null;
this._initialized = false;
},
/**
* 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)
{
#ifdef XP_WIN
// 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;
}
#endif
},
/// Current state displayed on the active window's taskbar item
_taskbarState: null,
_totalSize: 0,
_totalTransferred: 0,
_shouldSetState: function DTPU_shouldSetState()
{
#ifdef XP_WIN
// If the active window is not the download manager window, set the state
// only if it is normal or indeterminate.
return this._activeWindowIsDownloadWindow ||
(this._taskbarState == Ci.nsITaskbarProgress.STATE_NORMAL ||
this._taskbarState == Ci.nsITaskbarProgress.STATE_INDETERMINATE);
#else
return true;
#endif
},
/**
* 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 or indeterminate. i.e. one or more downloads are
* currently progressing or in scan mode. If we aren't, then we clear the
* indicator.
*/
_updateTaskbar: function DTPU_updateTaskbar()
{
if (!this._activeTaskbarProgress) {
return;
}
if (this._shouldSetState()) {
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 + this._dm.activePrivateDownloadCount;
let totalSize = 0, totalTransferred = 0;
if (numActive == 0) {
this._taskbarState = Ci.nsITaskbarProgress.STATE_NO_PROGRESS;
}
else {
let numPaused = 0, numScanning = 0;
// Enumerate all active downloads
[this._dm.activeDownloads, this._dm.activePrivateDownloads].forEach(function(downloads) {
while (downloads.hasMoreElements()) {
let download = downloads.getNext().QueryInterface(Ci.nsIDownload);
// Only set values if we actually know the download size
if (download.percentComplete != -1) {
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++;
} else if (download.state == this._dm.DOWNLOAD_SCANNING) {
numScanning++;
}
}
}.bind(this));
// 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 || numActive == numScanning) {
this._taskbarState = Ci.nsITaskbarProgress.STATE_INDETERMINATE;
totalSize = 0;
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();
}
}
};