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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80 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/. */
/**
* Handles the download progress indicator in the taskbar.
*/
"use strict";
this.EXPORTED_SYMBOLS = [
"DownloadsTaskbar",
];
////////////////////////////////////////////////////////////////////////////////
//// Globals
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;
const Cr = Components.results;
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Downloads",
"resource://gre/modules/Downloads.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "RecentWindow",
"resource:///modules/RecentWindow.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Services",
"resource://gre/modules/Services.jsm");
XPCOMUtils.defineLazyGetter(this, "gWinTaskbar", function () {
if (!("@mozilla.org/windows-taskbar;1" in Cc)) {
return null;
}
let winTaskbar = Cc["@mozilla.org/windows-taskbar;1"]
.getService(Ci.nsIWinTaskbar);
return winTaskbar.available && winTaskbar;
});
XPCOMUtils.defineLazyGetter(this, "gMacTaskbarProgress", function () {
return ("@mozilla.org/widget/macdocksupport;1" in Cc) &&
Cc["@mozilla.org/widget/macdocksupport;1"]
.getService(Ci.nsITaskbarProgress);
});
////////////////////////////////////////////////////////////////////////////////
//// DownloadsTaskbar
/**
* Handles the download progress indicator in the taskbar.
*/
this.DownloadsTaskbar = {
/**
* Underlying DownloadSummary providing the aggregate download information, or
* null if the indicator has never been initialized.
*/
_summary: null,
/**
* nsITaskbarProgress object to which download information is dispatched.
* This can be null if the indicator has never been initialized or if the
* indicator is currently hidden on Windows.
*/
_taskbarProgress: null,
/**
* This method is called after a new browser window is opened, and ensures
* that the download progress indicator is displayed in the taskbar.
*
* On Windows, the indicator is attached to the first browser window that
* calls this method. When the window is closed, the indicator is moved to
* another browser window, if available, in no particular order. When there
* are no browser windows visible, the indicator is hidden.
*
* On Mac OS X, the indicator is initialized globally when this method is
* called for the first time. Subsequent calls have no effect.
*
* @param aBrowserWindow
* nsIDOMWindow object of the newly opened browser window to which the
* indicator may be attached.
*/
registerIndicator(aBrowserWindow) {
if (!this._taskbarProgress) {
if (gMacTaskbarProgress) {
// On Mac OS X, we have to register the global indicator only once.
this._taskbarProgress = gMacTaskbarProgress;
// Free the XPCOM reference on shutdown, to prevent detecting a leak.
Services.obs.addObserver(() => {
this._taskbarProgress = null;
gMacTaskbarProgress = null;
}, "quit-application-granted", false);
} else if (gWinTaskbar) {
// On Windows, the indicator is currently hidden because we have no
// previous browser window, thus we should attach the indicator now.
this._attachIndicator(aBrowserWindow);
} else {
// The taskbar indicator is not available on this platform.
return;
}
}
// Ensure that the DownloadSummary object will be created asynchronously.
if (!this._summary) {
Downloads.getSummary(Downloads.ALL).then(summary => {
// In case the method is re-entered, we simply ignore redundant
// invocations of the callback, instead of keeping separate state.
if (this._summary) {
return;
}
this._summary = summary;
return this._summary.addView(this);
}).then(null, Cu.reportError);
}
},
/**
* On Windows, attaches the taskbar indicator to the specified browser window.
*/
_attachIndicator(aWindow) {
// Activate the indicator on the specified window.
let docShell = aWindow.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIWebNavigation)
.QueryInterface(Ci.nsIDocShellTreeItem).treeOwner
.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIXULWindow).docShell;
this._taskbarProgress = gWinTaskbar.getTaskbarProgress(docShell);
// If the DownloadSummary object has already been created, we should update
// the state of the new indicator, otherwise it will be updated as soon as
// the DownloadSummary view is registered.
if (this._summary) {
this.onSummaryChanged();
}
aWindow.addEventListener("unload", () => {
// Locate another browser window, excluding the one being closed.
let browserWindow = RecentWindow.getMostRecentBrowserWindow();
if (browserWindow) {
// Move the progress indicator to the other browser window.
this._attachIndicator(browserWindow);
} else {
// The last browser window has been closed. We remove the reference to
// the taskbar progress object so that the indicator will be registered
// again on the next browser window that is opened.
this._taskbarProgress = null;
}
}, false);
},
//////////////////////////////////////////////////////////////////////////////
//// DownloadSummary view
onSummaryChanged() {
// If the last browser window has been closed, we have no indicator any more.
if (!this._taskbarProgress) {
return;
}
if (this._summary.allHaveStopped || this._summary.progressTotalBytes == 0) {
this._taskbarProgress.setProgressState(
Ci.nsITaskbarProgress.STATE_NO_PROGRESS, 0, 0);
} else {
// For a brief moment before completion, some download components may
// report more transferred bytes than the total number of bytes. Thus,
// ensure that we never break the expectations of the progress indicator.
let progressCurrentBytes = Math.min(this._summary.progressTotalBytes,
this._summary.progressCurrentBytes);
this._taskbarProgress.setProgressState(
Ci.nsITaskbarProgress.STATE_NORMAL,
progressCurrentBytes,
this._summary.progressTotalBytes);
}
},
};
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