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gecko-dev/browser/components/downloads/DownloadsCommon.jsm

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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/. */
"use strict";
this.EXPORTED_SYMBOLS = [
"DownloadsCommon",
];
/**
* Handles the Downloads panel shared methods and data access.
*
* This file includes the following constructors and global objects:
*
* DownloadsCommon
* This object is exposed directly to the consumers of this JavaScript module,
* and provides shared methods for all the instances of the user interface.
*
* DownloadsData
* Retrieves the list of past and completed downloads from the underlying
* Download Manager data, and provides asynchronous notifications allowing
* to build a consistent view of the available data.
*
* DownloadsDataItem
* Represents a single item in the list of downloads. This object either wraps
* an existing nsIDownload from the Download Manager, or provides the same
* information read directly from the downloads database, with the possibility
* of querying the nsIDownload lazily, for performance reasons.
*
* DownloadsIndicatorData
* This object registers itself with DownloadsData as a view, and transforms the
* notifications it receives into overall status data, that is then broadcast to
* the registered download status indicators.
*/
////////////////////////////////////////////////////////////////////////////////
//// Globals
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;
const Cr = Components.results;
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "NetUtil",
"resource://gre/modules/NetUtil.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "PluralForm",
"resource://gre/modules/PluralForm.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Downloads",
"resource://gre/modules/Downloads.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "DownloadUIHelper",
"resource://gre/modules/DownloadUIHelper.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "DownloadUtils",
"resource://gre/modules/DownloadUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "OS",
"resource://gre/modules/osfile.jsm")
XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
"resource://gre/modules/PlacesUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "PrivateBrowsingUtils",
"resource://gre/modules/PrivateBrowsingUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "RecentWindow",
"resource:///modules/RecentWindow.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Promise",
"resource://gre/modules/Promise.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Task",
"resource://gre/modules/Task.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "DownloadsLogger",
"resource:///modules/DownloadsLogger.jsm");
const nsIDM = Ci.nsIDownloadManager;
const kDownloadsStringBundleUrl =
"chrome://browser/locale/downloads/downloads.properties";
const kDownloadsStringsRequiringFormatting = {
sizeWithUnits: true,
shortTimeLeftSeconds: true,
shortTimeLeftMinutes: true,
shortTimeLeftHours: true,
shortTimeLeftDays: true,
statusSeparator: true,
statusSeparatorBeforeNumber: true,
fileExecutableSecurityWarning: true
};
const kDownloadsStringsRequiringPluralForm = {
otherDownloads2: true
};
XPCOMUtils.defineLazyGetter(this, "DownloadsLocalFileCtor", function () {
return Components.Constructor("@mozilla.org/file/local;1",
"nsILocalFile", "initWithPath");
});
const kPartialDownloadSuffix = ".part";
const kPrefBranch = Services.prefs.getBranch("browser.download.");
let PrefObserver = {
QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver,
Ci.nsISupportsWeakReference]),
getPref: function PO_getPref(name) {
try {
switch (typeof this.prefs[name]) {
case "boolean":
return kPrefBranch.getBoolPref(name);
}
} catch (ex) { }
return this.prefs[name];
},
observe: function PO_observe(aSubject, aTopic, aData) {
if (this.prefs.hasOwnProperty(aData)) {
return this[aData] = this.getPref(aData);
}
},
register: function PO_register(prefs) {
this.prefs = prefs;
kPrefBranch.addObserver("", this, true);
for (let key in prefs) {
let name = key;
XPCOMUtils.defineLazyGetter(this, name, function () {
return PrefObserver.getPref(name);
});
}
},
};
PrefObserver.register({
// prefName: defaultValue
debug: false,
animateNotifications: true
});
////////////////////////////////////////////////////////////////////////////////
//// DownloadsCommon
/**
* This object is exposed directly to the consumers of this JavaScript module,
* and provides shared methods for all the instances of the user interface.
*/
this.DownloadsCommon = {
/**
* Constants with the different types of unblock messages.
*/
BLOCK_VERDICT_MALWARE: "Malware",
BLOCK_VERDICT_POTENTIALLY_UNWANTED: "PotentiallyUnwanted",
BLOCK_VERDICT_UNCOMMON: "Uncommon",
log: function DC_log(...aMessageArgs) {
delete this.log;
this.log = function DC_log(...aMessageArgs) {
if (!PrefObserver.debug) {
return;
}
DownloadsLogger.log.apply(DownloadsLogger, aMessageArgs);
}
this.log.apply(this, aMessageArgs);
},
error: function DC_error(...aMessageArgs) {
delete this.error;
this.error = function DC_error(...aMessageArgs) {
if (!PrefObserver.debug) {
return;
}
DownloadsLogger.reportError.apply(DownloadsLogger, aMessageArgs);
}
this.error.apply(this, aMessageArgs);
},
/**
* Returns an object whose keys are the string names from the downloads string
* bundle, and whose values are either the translated strings or functions
* returning formatted strings.
*/
get strings()
{
let strings = {};
let sb = Services.strings.createBundle(kDownloadsStringBundleUrl);
let enumerator = sb.getSimpleEnumeration();
while (enumerator.hasMoreElements()) {
let string = enumerator.getNext().QueryInterface(Ci.nsIPropertyElement);
let stringName = string.key;
if (stringName in kDownloadsStringsRequiringFormatting) {
strings[stringName] = function () {
// Convert "arguments" to a real array before calling into XPCOM.
return sb.formatStringFromName(stringName,
Array.slice(arguments, 0),
arguments.length);
};
} else if (stringName in kDownloadsStringsRequiringPluralForm) {
strings[stringName] = function (aCount) {
// Convert "arguments" to a real array before calling into XPCOM.
let formattedString = sb.formatStringFromName(stringName,
Array.slice(arguments, 0),
arguments.length);
return PluralForm.get(aCount, formattedString);
};
} else {
strings[stringName] = string.value;
}
}
delete this.strings;
return this.strings = strings;
},
/**
* Generates a very short string representing the given time left.
*
* @param aSeconds
* Value to be formatted. It represents the number of seconds, it must
* be positive but does not need to be an integer.
*
* @return Formatted string, for example "30s" or "2h". The returned value is
* maximum three characters long, at least in English.
*/
formatTimeLeft: function DC_formatTimeLeft(aSeconds)
{
// Decide what text to show for the time
let seconds = Math.round(aSeconds);
if (!seconds) {
return "";
} else if (seconds <= 30) {
return DownloadsCommon.strings["shortTimeLeftSeconds"](seconds);
}
let minutes = Math.round(aSeconds / 60);
if (minutes < 60) {
return DownloadsCommon.strings["shortTimeLeftMinutes"](minutes);
}
let hours = Math.round(minutes / 60);
if (hours < 48) { // two days
return DownloadsCommon.strings["shortTimeLeftHours"](hours);
}
let days = Math.round(hours / 24);
return DownloadsCommon.strings["shortTimeLeftDays"](Math.min(days, 99));
},
/**
* Indicates whether we should show visual notification on the indicator
* when a download event is triggered.
*/
get animateNotifications()
{
return PrefObserver.animateNotifications;
},
/**
* Get access to one of the DownloadsData or PrivateDownloadsData objects,
* depending on the privacy status of the window in question.
*
* @param aWindow
* The browser window which owns the download button.
*/
getData: function DC_getData(aWindow) {
if (PrivateBrowsingUtils.isWindowPrivate(aWindow)) {
return PrivateDownloadsData;
} else {
return DownloadsData;
}
},
/**
* Initializes the Downloads back-end and starts receiving events for both the
* private and non-private downloads data objects.
*/
initializeAllDataLinks: function () {
DownloadsData.initializeDataLink();
PrivateDownloadsData.initializeDataLink();
},
/**
* Get access to one of the DownloadsIndicatorData or
* PrivateDownloadsIndicatorData objects, depending on the privacy status of
* the window in question.
*/
getIndicatorData: function DC_getIndicatorData(aWindow) {
if (PrivateBrowsingUtils.isWindowPrivate(aWindow)) {
return PrivateDownloadsIndicatorData;
} else {
return DownloadsIndicatorData;
}
},
/**
* Returns a reference to the DownloadsSummaryData singleton - creating one
* in the process if one hasn't been instantiated yet.
*
* @param aWindow
* The browser window which owns the download button.
* @param aNumToExclude
* The number of items on the top of the downloads list to exclude
* from the summary.
*/
getSummary: function DC_getSummary(aWindow, aNumToExclude)
{
if (PrivateBrowsingUtils.isWindowPrivate(aWindow)) {
if (this._privateSummary) {
return this._privateSummary;
}
return this._privateSummary = new DownloadsSummaryData(true, aNumToExclude);
} else {
if (this._summary) {
return this._summary;
}
return this._summary = new DownloadsSummaryData(false, aNumToExclude);
}
},
_summary: null,
_privateSummary: null,
/**
* Given an iterable collection of DownloadDataItems, generates and returns
* statistics about that collection.
*
* @param aDataItems An iterable collection of DownloadDataItems.
*
* @return Object whose properties are the generated statistics. Currently,
* we return the following properties:
*
* numActive : The total number of downloads.
* numPaused : The total number of paused downloads.
* numScanning : The total number of downloads being scanned.
* numDownloading : The total number of downloads being downloaded.
* totalSize : The total size of all downloads once completed.
* totalTransferred: The total amount of transferred data for these
* downloads.
* slowestSpeed : The slowest download rate.
* rawTimeLeft : The estimated time left for the downloads to
* complete.
* percentComplete : The percentage of bytes successfully downloaded.
*/
summarizeDownloads: function DC_summarizeDownloads(aDataItems)
{
let summary = {
numActive: 0,
numPaused: 0,
numScanning: 0,
numDownloading: 0,
totalSize: 0,
totalTransferred: 0,
// slowestSpeed is Infinity so that we can use Math.min to
// find the slowest speed. We'll set this to 0 afterwards if
// it's still at Infinity by the time we're done iterating all
// dataItems.
slowestSpeed: Infinity,
rawTimeLeft: -1,
percentComplete: -1
}
for (let dataItem of aDataItems) {
summary.numActive++;
switch (dataItem.state) {
case nsIDM.DOWNLOAD_PAUSED:
summary.numPaused++;
break;
case nsIDM.DOWNLOAD_SCANNING:
summary.numScanning++;
break;
case nsIDM.DOWNLOAD_DOWNLOADING:
summary.numDownloading++;
if (dataItem.maxBytes > 0 && dataItem.speed > 0) {
let sizeLeft = dataItem.maxBytes - dataItem.currBytes;
summary.rawTimeLeft = Math.max(summary.rawTimeLeft,
sizeLeft / dataItem.speed);
summary.slowestSpeed = Math.min(summary.slowestSpeed,
dataItem.speed);
}
break;
}
// Only add to total values if we actually know the download size.
if (dataItem.maxBytes > 0 &&
dataItem.state != nsIDM.DOWNLOAD_CANCELED &&
dataItem.state != nsIDM.DOWNLOAD_FAILED) {
summary.totalSize += dataItem.maxBytes;
summary.totalTransferred += dataItem.currBytes;
}
}
if (summary.numActive != 0 && summary.totalSize != 0 &&
summary.numActive != summary.numScanning) {
summary.percentComplete = (summary.totalTransferred /
summary.totalSize) * 100;
}
if (summary.slowestSpeed == Infinity) {
summary.slowestSpeed = 0;
}
return summary;
},
/**
* If necessary, smooths the estimated number of seconds remaining for one
* or more downloads to complete.
*
* @param aSeconds
* Current raw estimate on number of seconds left for one or more
* downloads. This is a floating point value to help get sub-second
* accuracy for current and future estimates.
*/
smoothSeconds: function DC_smoothSeconds(aSeconds, aLastSeconds)
{
// We apply an algorithm similar to the DownloadUtils.getTimeLeft function,
// though tailored to a single time estimation for all downloads. We never
// apply something if the new value is less than half the previous value.
let shouldApplySmoothing = aLastSeconds >= 0 &&
aSeconds > aLastSeconds / 2;
if (shouldApplySmoothing) {
// Apply hysteresis to favor downward over upward swings. Trust only 30%
// of the new value if lower, and 10% if higher (exponential smoothing).
let (diff = aSeconds - aLastSeconds) {
aSeconds = aLastSeconds + (diff < 0 ? .3 : .1) * diff;
}
// If the new time is similar, reuse something close to the last time
// left, but subtract a little to provide forward progress.
let diff = aSeconds - aLastSeconds;
let diffPercent = diff / aLastSeconds * 100;
if (Math.abs(diff) < 5 || Math.abs(diffPercent) < 5) {
aSeconds = aLastSeconds - (diff < 0 ? .4 : .2);
}
}
// In the last few seconds of downloading, we are always subtracting and
// never adding to the time left. Ensure that we never fall below one
// second left until all downloads are actually finished.
return aLastSeconds = Math.max(aSeconds, 1);
},
/**
* Opens a downloaded file.
* If you've a dataItem, you should call dataItem.openLocalFile.
* @param aFile
* the downloaded file to be opened.
* @param aMimeInfo
* the mime type info object. May be null.
* @param aOwnerWindow
* the window with which this action is associated.
*/
openDownloadedFile: function DC_openDownloadedFile(aFile, aMimeInfo, aOwnerWindow) {
if (!(aFile instanceof Ci.nsIFile))
throw new Error("aFile must be a nsIFile object");
if (aMimeInfo && !(aMimeInfo instanceof Ci.nsIMIMEInfo))
throw new Error("Invalid value passed for aMimeInfo");
if (!(aOwnerWindow instanceof Ci.nsIDOMWindow))
throw new Error("aOwnerWindow must be a dom-window object");
let promiseShouldLaunch;
if (aFile.isExecutable()) {
// We get a prompter for the provided window here, even though anchoring
// to the most recently active window should work as well.
promiseShouldLaunch =
DownloadUIHelper.getPrompter(aOwnerWindow)
.confirmLaunchExecutable(aFile.path);
} else {
promiseShouldLaunch = Promise.resolve(true);
}
promiseShouldLaunch.then(shouldLaunch => {
if (!shouldLaunch) {
return;
}
// Actually open the file.
try {
if (aMimeInfo && aMimeInfo.preferredAction == aMimeInfo.useHelperApp) {
aMimeInfo.launchWithFile(aFile);
return;
}
}
catch(ex) { }
// If either we don't have the mime info, or the preferred action failed,
// attempt to launch the file directly.
try {
aFile.launch();
}
catch(ex) {
// If launch fails, try sending it through the system's external "file:"
// URL handler.
Cc["@mozilla.org/uriloader/external-protocol-service;1"]
.getService(Ci.nsIExternalProtocolService)
.loadUrl(NetUtil.newURI(aFile));
}
}).then(null, Cu.reportError);
},
/**
* Show a downloaded file in the system file manager.
* If you have a dataItem, use dataItem.showLocalFile.
*
* @param aFile
* a downloaded file.
*/
showDownloadedFile: function DC_showDownloadedFile(aFile) {
if (!(aFile instanceof Ci.nsIFile))
throw new Error("aFile must be a nsIFile object");
try {
// Show the directory containing the file and select the file.
aFile.reveal();
} catch (ex) {
// If reveal fails for some reason (e.g., it's not implemented on unix
// or the file doesn't exist), try using the parent if we have it.
let parent = aFile.parent;
if (parent) {
try {
// Open the parent directory to show where the file should be.
parent.launch();
} catch (ex) {
// If launch also fails (probably because it's not implemented), let
// the OS handler try to open the parent.
Cc["@mozilla.org/uriloader/external-protocol-service;1"]
.getService(Ci.nsIExternalProtocolService)
.loadUrl(NetUtil.newURI(parent));
}
}
}
},
/**
* Displays an alert message box which asks the user if they want to
* unblock the downloaded file or not.
*
* @param aType
* The type of malware the downloaded file contains.
* @param aOwnerWindow
* The window with which this action is associated.
*
* @return True to unblock the file, false to keep the user safe and
* cancel the operation.
*/
confirmUnblockDownload: Task.async(function* DP_confirmUnblockDownload(aType, aOwnerWindow) {
let s = DownloadsCommon.strings;
let title = s.unblockHeader;
let buttonFlags = (Ci.nsIPrompt.BUTTON_TITLE_IS_STRING * Ci.nsIPrompt.BUTTON_POS_0) +
(Ci.nsIPrompt.BUTTON_TITLE_IS_STRING * Ci.nsIPrompt.BUTTON_POS_1);
let type = "";
let message = s.unblockTip;
let okButton = s.unblockButtonContinue;
let cancelButton = s.unblockButtonCancel;
switch (aType) {
case this.BLOCK_VERDICT_MALWARE:
type = s.unblockTypeMalware;
break;
case this.BLOCK_VERDICT_POTENTIALLY_UNWANTED:
type = s.unblockTypePotentiallyUnwanted;
break;
case this.BLOCK_VERDICT_UNCOMMON:
type = s.unblockTypeUncommon;
break;
}
if (type) {
message = type + "\n\n" + message;
}
Services.ww.registerNotification(function onOpen(subj, topic) {
if (topic == "domwindowopened" && subj instanceof Ci.nsIDOMWindow) {
// Make sure to listen for "DOMContentLoaded" because it is fired
// before the "load" event.
subj.addEventListener("DOMContentLoaded", function onLoad() {
subj.removeEventListener("DOMContentLoaded", onLoad);
if (subj.document.documentURI ==
"chrome://global/content/commonDialog.xul") {
Services.ww.unregisterNotification(onOpen);
let dialog = subj.document.getElementById("commonDialog");
if (dialog) {
// Change the dialog to use a warning icon.
dialog.classList.add("alert-dialog");
}
}
});
}
});
let rv = Services.prompt.confirmEx(aOwnerWindow, title, message, buttonFlags,
cancelButton, okButton, null, null, {});
return (rv == 1);
}),
};
/**
* Returns true if we are executing on Windows Vista or a later version.
*/
XPCOMUtils.defineLazyGetter(DownloadsCommon, "isWinVistaOrHigher", function () {
let os = Cc["@mozilla.org/xre/app-info;1"].getService(Ci.nsIXULRuntime).OS;
if (os != "WINNT") {
return false;
}
let sysInfo = Cc["@mozilla.org/system-info;1"].getService(Ci.nsIPropertyBag2);
return parseFloat(sysInfo.getProperty("version")) >= 6;
});
////////////////////////////////////////////////////////////////////////////////
//// DownloadsData
/**
* Retrieves the list of past and completed downloads from the underlying
* Download Manager data, and provides asynchronous notifications allowing to
* build a consistent view of the available data.
*
* This object responds to real-time changes in the underlying Download Manager
* data. For example, the deletion of one or more downloads is notified through
* the nsIObserver interface, while any state or progress change is notified
* through the nsIDownloadProgressListener interface.
*
* Note that using this object does not automatically start the Download Manager
* service. Consumers will see an empty list of downloads until the service is
* actually started. This is useful to display a neutral progress indicator in
* the main browser window until the autostart timeout elapses.
*
* Note that DownloadsData and PrivateDownloadsData are two equivalent singleton
* objects, one accessing non-private downloads, and the other accessing private
* ones.
*/
function DownloadsDataCtor(aPrivate) {
this._isPrivate = aPrivate;
// This Object contains all the available DownloadsDataItem objects, indexed by
// their globally unique identifier. The identifiers of downloads that have
// been removed from the Download Manager data are still present, however the
// associated objects are replaced with the value "null". This is required to
// prevent race conditions when populating the list asynchronously.
this.dataItems = {};
// Array of view objects that should be notified when the available download
// data changes.
this._views = [];
// Maps Download objects to DownloadDataItem objects.
this._downloadToDataItemMap = new Map();
}
DownloadsDataCtor.prototype = {
/**
* Starts receiving events for current downloads.
*/
initializeDataLink: function ()
{
if (!this._dataLinkInitialized) {
let promiseList = Downloads.getList(this._isPrivate ? Downloads.PRIVATE
: Downloads.PUBLIC);
promiseList.then(list => list.addView(this)).then(null, Cu.reportError);
this._dataLinkInitialized = true;
}
},
_dataLinkInitialized: false,
/**
* True if there are finished downloads that can be removed from the list.
*/
get canRemoveFinished()
{
for (let [, dataItem] of Iterator(this.dataItems)) {
if (dataItem && !dataItem.inProgress) {
return true;
}
}
return false;
},
/**
* Asks the back-end to remove finished downloads from the list.
*/
removeFinished: function DD_removeFinished()
{
let promiseList = Downloads.getList(this._isPrivate ? Downloads.PRIVATE
: Downloads.PUBLIC);
promiseList.then(list => list.removeFinished())
.then(null, Cu.reportError);
},
//////////////////////////////////////////////////////////////////////////////
//// Integration with the asynchronous Downloads back-end
onDownloadAdded: function (aDownload)
{
let dataItem = new DownloadsDataItem(aDownload);
this._downloadToDataItemMap.set(aDownload, dataItem);
this.dataItems[dataItem.downloadGuid] = dataItem;
for (let view of this._views) {
view.onDataItemAdded(dataItem, true);
}
this._updateDataItemState(dataItem);
},
onDownloadChanged: function (aDownload)
{
let dataItem = this._downloadToDataItemMap.get(aDownload);
if (!dataItem) {
Cu.reportError("Download doesn't exist.");
return;
}
this._updateDataItemState(dataItem);
},
onDownloadRemoved: function (aDownload)
{
let dataItem = this._downloadToDataItemMap.get(aDownload);
if (!dataItem) {
Cu.reportError("Download doesn't exist.");
return;
}
this._downloadToDataItemMap.delete(aDownload);
this.dataItems[dataItem.downloadGuid] = null;
for (let view of this._views) {
view.onDataItemRemoved(dataItem);
}
},
/**
* Updates the given data item and sends related notifications.
*/
_updateDataItemState: function (aDataItem)
{
let oldState = aDataItem.state;
let wasInProgress = aDataItem.inProgress;
let wasDone = aDataItem.done;
aDataItem.updateFromDownload();
if (wasInProgress && !aDataItem.inProgress) {
aDataItem.endTime = Date.now();
}
if (oldState != aDataItem.state) {
for (let view of this._views) {
try {
view.getViewItem(aDataItem).onStateChange(oldState);
} catch (ex) {
Cu.reportError(ex);
}
}
// This state transition code should actually be located in a Downloads
// API module (bug 941009). Moreover, the fact that state is stored as
// annotations should be ideally hidden behind methods of
// nsIDownloadHistory (bug 830415).
if (!this._isPrivate && !aDataItem.inProgress) {
try {
let downloadMetaData = { state: aDataItem.state,
endTime: aDataItem.endTime };
if (aDataItem.done) {
downloadMetaData.fileSize = aDataItem.maxBytes;
}
PlacesUtils.annotations.setPageAnnotation(
NetUtil.newURI(aDataItem.uri), "downloads/metaData",
JSON.stringify(downloadMetaData), 0,
PlacesUtils.annotations.EXPIRE_WITH_HISTORY);
} catch (ex) {
Cu.reportError(ex);
}
}
}
if (!aDataItem.newDownloadNotified) {
aDataItem.newDownloadNotified = true;
this._notifyDownloadEvent("start");
}
if (!wasDone && aDataItem.done) {
this._notifyDownloadEvent("finish");
}
for (let view of this._views) {
view.getViewItem(aDataItem).onProgressChange();
}
},
//////////////////////////////////////////////////////////////////////////////
//// Registration of views
/**
* Adds an object to be notified when the available download data changes.
* The specified object is initialized with the currently available downloads.
*
* @param aView
* DownloadsView object to be added. This reference must be passed to
* removeView before termination.
*/
addView: function DD_addView(aView)
{
this._views.push(aView);
this._updateView(aView);
},
/**
* Removes an object previously added using addView.
*
* @param aView
* DownloadsView object to be removed.
*/
removeView: function DD_removeView(aView)
{
let index = this._views.indexOf(aView);
if (index != -1) {
this._views.splice(index, 1);
}
},
/**
* Ensures that the currently loaded data is added to the specified view.
*
* @param aView
* DownloadsView object to be initialized.
*/
_updateView: function DD_updateView(aView)
{
// Indicate to the view that a batch loading operation is in progress.
aView.onDataLoadStarting();
// Sort backwards by start time, ensuring that the most recent
// downloads are added first regardless of their state.
let loadedItemsArray = [dataItem
for each (dataItem in this.dataItems)
if (dataItem)];
loadedItemsArray.sort(function(a, b) b.startTime - a.startTime);
loadedItemsArray.forEach(
function (dataItem) aView.onDataItemAdded(dataItem, false)
);
// Notify the view that all data is available.
aView.onDataLoadCompleted();
},
//////////////////////////////////////////////////////////////////////////////
//// Notifications sent to the most recent browser window only
/**
* Set to true after the first download causes the downloads panel to be
* displayed.
*/
get panelHasShownBefore() {
try {
return Services.prefs.getBoolPref("browser.download.panel.shown");
} catch (ex) { }
return false;
},
set panelHasShownBefore(aValue) {
Services.prefs.setBoolPref("browser.download.panel.shown", aValue);
return aValue;
},
/**
* Displays a new or finished download notification in the most recent browser
* window, if one is currently available with the required privacy type.
*
* @param aType
* Set to "start" for new downloads, "finish" for completed downloads.
*/
_notifyDownloadEvent: function DD_notifyDownloadEvent(aType)
{
DownloadsCommon.log("Attempting to notify that a new download has started or finished.");
// Show the panel in the most recent browser window, if present.
let browserWin = RecentWindow.getMostRecentBrowserWindow({ private: this._isPrivate });
if (!browserWin) {
return;
}
if (this.panelHasShownBefore) {
// For new downloads after the first one, don't show the panel
// automatically, but provide a visible notification in the topmost
// browser window, if the status indicator is already visible.
DownloadsCommon.log("Showing new download notification.");
browserWin.DownloadsIndicatorView.showEventNotification(aType);
return;
}
this.panelHasShownBefore = true;
browserWin.DownloadsPanel.showPanel();
}
};
XPCOMUtils.defineLazyGetter(this, "PrivateDownloadsData", function() {
return new DownloadsDataCtor(true);
});
XPCOMUtils.defineLazyGetter(this, "DownloadsData", function() {
return new DownloadsDataCtor(false);
});
////////////////////////////////////////////////////////////////////////////////
//// DownloadsDataItem
/**
* Represents a single item in the list of downloads.
*
* The endTime property is initialized to the current date and time.
*
* @param aDownload
* The Download object with the current state.
*/
function DownloadsDataItem(aDownload)
{
this._download = aDownload;
this.downloadGuid = "id:" + this._autoIncrementId;
this.file = aDownload.target.path;
this.target = OS.Path.basename(aDownload.target.path);
this.uri = aDownload.source.url;
this.endTime = Date.now();
this.updateFromDownload();
}
DownloadsDataItem.prototype = {
/**
* The JavaScript API does not need identifiers for Download objects, so they
* are generated sequentially for the corresponding DownloadDataItem.
*/
get _autoIncrementId() ++DownloadsDataItem.prototype.__lastId,
__lastId: 0,
/**
* Updates this object from the underlying Download object.
*/
updateFromDownload: function ()
{
// Collapse state using the correct priority.
if (this._download.succeeded) {
this.state = nsIDM.DOWNLOAD_FINISHED;
} else if (this._download.error &&
this._download.error.becauseBlockedByParentalControls) {
this.state = nsIDM.DOWNLOAD_BLOCKED_PARENTAL;
} else if (this._download.error &&
this._download.error.becauseBlockedByReputationCheck) {
this.state = nsIDM.DOWNLOAD_DIRTY;
} else if (this._download.error) {
this.state = nsIDM.DOWNLOAD_FAILED;
} else if (this._download.canceled && this._download.hasPartialData) {
this.state = nsIDM.DOWNLOAD_PAUSED;
} else if (this._download.canceled) {
this.state = nsIDM.DOWNLOAD_CANCELED;
} else if (this._download.stopped) {
this.state = nsIDM.DOWNLOAD_NOTSTARTED;
} else {
this.state = nsIDM.DOWNLOAD_DOWNLOADING;
}
this.referrer = this._download.source.referrer;
this.startTime = this._download.startTime;
this.currBytes = this._download.currentBytes;
this.resumable = this._download.hasPartialData;
this.speed = this._download.speed;
if (this._download.succeeded) {
// If the download succeeded, show the final size if available, otherwise
// use the last known number of bytes transferred. The final size on disk
// will be available when bug 941063 is resolved.
this.maxBytes = this._download.hasProgress ?
this._download.totalBytes :
this._download.currentBytes;
this.percentComplete = 100;
} else if (this._download.hasProgress) {
// If the final size and progress are known, use them.
this.maxBytes = this._download.totalBytes;
this.percentComplete = this._download.progress;
} else {
// The download final size and progress percentage is unknown.
this.maxBytes = -1;
this.percentComplete = -1;
}
},
/**
* Indicates whether the download is proceeding normally, and not finished
* yet. This includes paused downloads. When this property is true, the
* "progress" property represents the current progress of the download.
*/
get inProgress()
{
return [
nsIDM.DOWNLOAD_NOTSTARTED,
nsIDM.DOWNLOAD_QUEUED,
nsIDM.DOWNLOAD_DOWNLOADING,
nsIDM.DOWNLOAD_PAUSED,
nsIDM.DOWNLOAD_SCANNING,
].indexOf(this.state) != -1;
},
/**
* This is true during the initial phases of a download, before the actual
* download of data bytes starts.
*/
get starting()
{
return this.state == nsIDM.DOWNLOAD_NOTSTARTED ||
this.state == nsIDM.DOWNLOAD_QUEUED;
},
/**
* Indicates whether the download is paused.
*/
get paused()
{
return this.state == nsIDM.DOWNLOAD_PAUSED;
},
/**
* Indicates whether the download is in a final state, either because it
* completed successfully or because it was blocked.
*/
get done()
{
return [
nsIDM.DOWNLOAD_FINISHED,
nsIDM.DOWNLOAD_BLOCKED_PARENTAL,
nsIDM.DOWNLOAD_BLOCKED_POLICY,
nsIDM.DOWNLOAD_DIRTY,
].indexOf(this.state) != -1;
},
/**
* Indicates whether the download is finished and can be opened.
*/
get openable()
{
return this.state == nsIDM.DOWNLOAD_FINISHED;
},
/**
* Indicates whether the download stopped because of an error, and can be
* resumed manually.
*/
get canRetry()
{
return this.state == nsIDM.DOWNLOAD_CANCELED ||
this.state == nsIDM.DOWNLOAD_FAILED;
},
/**
* Returns the nsILocalFile for the download target.
*
* @throws if the native path is not valid. This can happen if the same
* profile is used on different platforms, for example if a native
* Windows path is stored and then the item is accessed on a Mac.
*/
get localFile()
{
return this._getFile(this.file);
},
/**
* Returns the nsILocalFile for the partially downloaded target.
*
* @throws if the native path is not valid. This can happen if the same
* profile is used on different platforms, for example if a native
* Windows path is stored and then the item is accessed on a Mac.
*/
get partFile()
{
return this._getFile(this.file + kPartialDownloadSuffix);
},
/**
* Returns an nsILocalFile for aFilename. aFilename might be a file URL or
* a native path.
*
* @param aFilename the filename of the file to retrieve.
* @return an nsILocalFile for the file.
* @throws if the native path is not valid. This can happen if the same
* profile is used on different platforms, for example if a native
* Windows path is stored and then the item is accessed on a Mac.
* @note This function makes no guarantees about the file's existence -
* callers should check that the returned file exists.
*/
_getFile: function DDI__getFile(aFilename)
{
// The download database may contain targets stored as file URLs or native
// paths. This can still be true for previously stored items, even if new
// items are stored using their file URL. See also bug 239948 comment 12.
if (aFilename.startsWith("file:")) {
// Assume the file URL we obtained from the downloads database or from the
// "spec" property of the target has the UTF-8 charset.
let fileUrl = NetUtil.newURI(aFilename).QueryInterface(Ci.nsIFileURL);
return fileUrl.file.clone().QueryInterface(Ci.nsILocalFile);
} else {
// The downloads database contains a native path. Try to create a local
// file, though this may throw an exception if the path is invalid.
return new DownloadsLocalFileCtor(aFilename);
}
},
/**
* Open the target file for this download.
*/
openLocalFile: function () {
this._download.launch().then(null, Cu.reportError);
},
/**
* Show the downloaded file in the system file manager.
*/
showLocalFile: function DDI_showLocalFile() {
DownloadsCommon.showDownloadedFile(this.localFile);
},
/**
* Resumes the download if paused, pauses it if active.
* @throws if the download is not resumable or if has already done.
*/
togglePauseResume: function DDI_togglePauseResume() {
if (this._download.stopped) {
this._download.start();
} else {
this._download.cancel();
}
},
/**
* Attempts to retry the download.
* @throws if we cannot.
*/
retry: function DDI_retry() {
this._download.start();
},
/**
* Cancels the download.
*/
cancel: function() {
this._download.cancel();
this._download.removePartialData().then(null, Cu.reportError);
},
/**
* Remove the download.
*/
remove: function DDI_remove() {
Downloads.getList(Downloads.ALL)
.then(list => list.remove(this._download))
.then(() => this._download.finalize(true))
.then(null, Cu.reportError);
}
};
////////////////////////////////////////////////////////////////////////////////
//// DownloadsViewPrototype
/**
* A prototype for an object that registers itself with DownloadsData as soon
* as a view is registered with it.
*/
const DownloadsViewPrototype = {
//////////////////////////////////////////////////////////////////////////////
//// Registration of views
/**
* Array of view objects that should be notified when the available status
* data changes.
*
* SUBCLASSES MUST OVERRIDE THIS PROPERTY.
*/
_views: null,
/**
* Determines whether this view object is over the private or non-private
* downloads.
*
* SUBCLASSES MUST OVERRIDE THIS PROPERTY.
*/
_isPrivate: false,
/**
* Adds an object to be notified when the available status data changes.
* The specified object is initialized with the currently available status.
*
* @param aView
* View object to be added. This reference must be
* passed to removeView before termination.
*/
addView: function DVP_addView(aView)
{
// Start receiving events when the first of our views is registered.
if (this._views.length == 0) {
if (this._isPrivate) {
PrivateDownloadsData.addView(this);
} else {
DownloadsData.addView(this);
}
}
this._views.push(aView);
this.refreshView(aView);
},
/**
* Updates the properties of an object previously added using addView.
*
* @param aView
* View object to be updated.
*/
refreshView: function DVP_refreshView(aView)
{
// Update immediately even if we are still loading data asynchronously.
// Subclasses must provide these two functions!
this._refreshProperties();
this._updateView(aView);
},
/**
* Removes an object previously added using addView.
*
* @param aView
* View object to be removed.
*/
removeView: function DVP_removeView(aView)
{
let index = this._views.indexOf(aView);
if (index != -1) {
this._views.splice(index, 1);
}
// Stop receiving events when the last of our views is unregistered.
if (this._views.length == 0) {
if (this._isPrivate) {
PrivateDownloadsData.removeView(this);
} else {
DownloadsData.removeView(this);
}
}
},
//////////////////////////////////////////////////////////////////////////////
//// Callback functions from DownloadsData
/**
* Indicates whether we are still loading downloads data asynchronously.
*/
_loading: false,
/**
* Called before multiple downloads are about to be loaded.
*/
onDataLoadStarting: function DVP_onDataLoadStarting()
{
this._loading = true;
},
/**
* Called after data loading finished.
*/
onDataLoadCompleted: function DVP_onDataLoadCompleted()
{
this._loading = false;
},
/**
* Called when a new download data item is available, either during the
* asynchronous data load or when a new download is started.
*
* @param aDataItem
* DownloadsDataItem object that was just added.
* @param aNewest
* When true, indicates that this item is the most recent and should be
* added in the topmost position. This happens when a new download is
* started. When false, indicates that the item is the least recent
* with regard to the items that have been already added. The latter
* generally happens during the asynchronous data load.
*
* @note Subclasses should override this.
*/
onDataItemAdded: function DVP_onDataItemAdded(aDataItem, aNewest)
{
throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
},
/**
* Called when a data item is removed, ensures that the widget associated with
* the view item is removed from the user interface.
*
* @param aDataItem
* DownloadsDataItem object that is being removed.
*
* @note Subclasses should override this.
*/
onDataItemRemoved: function DVP_onDataItemRemoved(aDataItem)
{
throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
},
/**
* Returns the view item associated with the provided data item for this view.
*
* @param aDataItem
* DownloadsDataItem object for which the view item is requested.
*
* @return Object that can be used to notify item status events.
*
* @note Subclasses should override this.
*/
getViewItem: function DID_getViewItem(aDataItem)
{
throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
},
/**
* Private function used to refresh the internal properties being sent to
* each registered view.
*
* @note Subclasses should override this.
*/
_refreshProperties: function DID_refreshProperties()
{
throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
},
/**
* Private function used to refresh an individual view.
*
* @note Subclasses should override this.
*/
_updateView: function DID_updateView()
{
throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
}
};
////////////////////////////////////////////////////////////////////////////////
//// DownloadsIndicatorData
/**
* This object registers itself with DownloadsData as a view, and transforms the
* notifications it receives into overall status data, that is then broadcast to
* the registered download status indicators.
*
* Note that using this object does not automatically start the Download Manager
* service. Consumers will see an empty list of downloads until the service is
* actually started. This is useful to display a neutral progress indicator in
* the main browser window until the autostart timeout elapses.
*/
function DownloadsIndicatorDataCtor(aPrivate) {
this._isPrivate = aPrivate;
this._views = [];
}
DownloadsIndicatorDataCtor.prototype = {
__proto__: DownloadsViewPrototype,
/**
* Removes an object previously added using addView.
*
* @param aView
* DownloadsIndicatorView object to be removed.
*/
removeView: function DID_removeView(aView)
{
DownloadsViewPrototype.removeView.call(this, aView);
if (this._views.length == 0) {
this._itemCount = 0;
}
},
//////////////////////////////////////////////////////////////////////////////
//// Callback functions from DownloadsData
/**
* Called after data loading finished.
*/
onDataLoadCompleted: function DID_onDataLoadCompleted()
{
DownloadsViewPrototype.onDataLoadCompleted.call(this);
this._updateViews();
},
/**
* Called when a new download data item is available, either during the
* asynchronous data load or when a new download is started.
*
* @param aDataItem
* DownloadsDataItem object that was just added.
* @param aNewest
* When true, indicates that this item is the most recent and should be
* added in the topmost position. This happens when a new download is
* started. When false, indicates that the item is the least recent
* with regard to the items that have been already added. The latter
* generally happens during the asynchronous data load.
*/
onDataItemAdded: function DID_onDataItemAdded(aDataItem, aNewest)
{
this._itemCount++;
this._updateViews();
},
/**
* Called when a data item is removed, ensures that the widget associated with
* the view item is removed from the user interface.
*
* @param aDataItem
* DownloadsDataItem object that is being removed.
*/
onDataItemRemoved: function DID_onDataItemRemoved(aDataItem)
{
this._itemCount--;
this._updateViews();
},
/**
* Returns the view item associated with the provided data item for this view.
*
* @param aDataItem
* DownloadsDataItem object for which the view item is requested.
*
* @return Object that can be used to notify item status events.
*/
getViewItem: function DID_getViewItem(aDataItem)
{
let data = this._isPrivate ? PrivateDownloadsIndicatorData
: DownloadsIndicatorData;
return Object.freeze({
onStateChange: function DIVI_onStateChange(aOldState)
{
if (aDataItem.state == nsIDM.DOWNLOAD_FINISHED ||
aDataItem.state == nsIDM.DOWNLOAD_FAILED) {
data.attention = true;
}
// Since the state of a download changed, reset the estimated time left.
data._lastRawTimeLeft = -1;
data._lastTimeLeft = -1;
data._updateViews();
},
onProgressChange: function DIVI_onProgressChange()
{
data._updateViews();
}
});
},
//////////////////////////////////////////////////////////////////////////////
//// Propagation of properties to our views
// The following properties are updated by _refreshProperties and are then
// propagated to the views. See _refreshProperties for details.
_hasDownloads: false,
_counter: "",
_percentComplete: -1,
_paused: false,
/**
* Indicates whether the download indicators should be highlighted.
*/
set attention(aValue)
{
this._attention = aValue;
this._updateViews();
return aValue;
},
_attention: false,
/**
* Indicates whether the user is interacting with downloads, thus the
* attention indication should not be shown even if requested.
*/
set attentionSuppressed(aValue)
{
this._attentionSuppressed = aValue;
this._attention = false;
this._updateViews();
return aValue;
},
_attentionSuppressed: false,
/**
* Computes aggregate values and propagates the changes to our views.
*/
_updateViews: function DID_updateViews()
{
// Do not update the status indicators during batch loads of download items.
if (this._loading) {
return;
}
this._refreshProperties();
this._views.forEach(this._updateView, this);
},
/**
* Updates the specified view with the current aggregate values.
*
* @param aView
* DownloadsIndicatorView object to be updated.
*/
_updateView: function DID_updateView(aView)
{
aView.hasDownloads = this._hasDownloads;
aView.counter = this._counter;
aView.percentComplete = this._percentComplete;
aView.paused = this._paused;
aView.attention = this._attention && !this._attentionSuppressed;
},
//////////////////////////////////////////////////////////////////////////////
//// Property updating based on current download status
/**
* Number of download items that are available to be displayed.
*/
_itemCount: 0,
/**
* Floating point value indicating the last number of seconds estimated until
* the longest download will finish. We need to store this value so that we
* don't continuously apply smoothing if the actual download state has not
* changed. This is set to -1 if the previous value is unknown.
*/
_lastRawTimeLeft: -1,
/**
* Last number of seconds estimated until all in-progress downloads with a
* known size and speed will finish. This value is stored to allow smoothing
* in case of small variations. This is set to -1 if the previous value is
* unknown.
*/
_lastTimeLeft: -1,
/**
* A generator function for the dataItems that this summary is currently
* interested in. This generator is passed off to summarizeDownloads in order
* to generate statistics about the dataItems we care about - in this case,
* it's all dataItems for active downloads.
*/
_activeDataItems: function DID_activeDataItems()
{
let dataItems = this._isPrivate ? PrivateDownloadsData.dataItems
: DownloadsData.dataItems;
for each (let dataItem in dataItems) {
if (dataItem && dataItem.inProgress) {
yield dataItem;
}
}
},
/**
* Computes aggregate values based on the current state of downloads.
*/
_refreshProperties: function DID_refreshProperties()
{
let summary =
DownloadsCommon.summarizeDownloads(this._activeDataItems());
// Determine if the indicator should be shown or get attention.
this._hasDownloads = (this._itemCount > 0);
// If all downloads are paused, show the progress indicator as paused.
this._paused = summary.numActive > 0 &&
summary.numActive == summary.numPaused;
this._percentComplete = summary.percentComplete;
// Display the estimated time left, if present.
if (summary.rawTimeLeft == -1) {
// There are no downloads with a known time left.
this._lastRawTimeLeft = -1;
this._lastTimeLeft = -1;
this._counter = "";
} else {
// Compute the new time left only if state actually changed.
if (this._lastRawTimeLeft != summary.rawTimeLeft) {
this._lastRawTimeLeft = summary.rawTimeLeft;
this._lastTimeLeft = DownloadsCommon.smoothSeconds(summary.rawTimeLeft,
this._lastTimeLeft);
}
this._counter = DownloadsCommon.formatTimeLeft(this._lastTimeLeft);
}
}
};
XPCOMUtils.defineLazyGetter(this, "PrivateDownloadsIndicatorData", function() {
return new DownloadsIndicatorDataCtor(true);
});
XPCOMUtils.defineLazyGetter(this, "DownloadsIndicatorData", function() {
return new DownloadsIndicatorDataCtor(false);
});
////////////////////////////////////////////////////////////////////////////////
//// DownloadsSummaryData
/**
* DownloadsSummaryData is a view for DownloadsData that produces a summary
* of all downloads after a certain exclusion point aNumToExclude. For example,
* if there were 5 downloads in progress, and a DownloadsSummaryData was
* constructed with aNumToExclude equal to 3, then that DownloadsSummaryData
* would produce a summary of the last 2 downloads.
*
* @param aIsPrivate
* True if the browser window which owns the download button is a private
* window.
* @param aNumToExclude
* The number of items to exclude from the summary, starting from the
* top of the list.
*/
function DownloadsSummaryData(aIsPrivate, aNumToExclude) {
this._numToExclude = aNumToExclude;
// Since we can have multiple instances of DownloadsSummaryData, we
// override these values from the prototype so that each instance can be
// completely separated from one another.
this._loading = false;
this._dataItems = [];
// Floating point value indicating the last number of seconds estimated until
// the longest download will finish. We need to store this value so that we
// don't continuously apply smoothing if the actual download state has not
// changed. This is set to -1 if the previous value is unknown.
this._lastRawTimeLeft = -1;
// Last number of seconds estimated until all in-progress downloads with a
// known size and speed will finish. This value is stored to allow smoothing
// in case of small variations. This is set to -1 if the previous value is
// unknown.
this._lastTimeLeft = -1;
// The following properties are updated by _refreshProperties and are then
// propagated to the views.
this._showingProgress = false;
this._details = "";
this._description = "";
this._numActive = 0;
this._percentComplete = -1;
this._isPrivate = aIsPrivate;
this._views = [];
}
DownloadsSummaryData.prototype = {
__proto__: DownloadsViewPrototype,
/**
* Removes an object previously added using addView.
*
* @param aView
* DownloadsSummary view to be removed.
*/
removeView: function DSD_removeView(aView)
{
DownloadsViewPrototype.removeView.call(this, aView);
if (this._views.length == 0) {
// Clear out our collection of DownloadDataItems. If we ever have
// another view registered with us, this will get re-populated.
this._dataItems = [];
}
},
//////////////////////////////////////////////////////////////////////////////
//// Callback functions from DownloadsData - see the documentation in
//// DownloadsViewPrototype for more information on what these functions
//// are used for.
onDataLoadCompleted: function DSD_onDataLoadCompleted()
{
DownloadsViewPrototype.onDataLoadCompleted.call(this);
this._updateViews();
},
onDataItemAdded: function DSD_onDataItemAdded(aDataItem, aNewest)
{
if (aNewest) {
this._dataItems.unshift(aDataItem);
} else {
this._dataItems.push(aDataItem);
}
this._updateViews();
},
onDataItemRemoved: function DSD_onDataItemRemoved(aDataItem)
{
let itemIndex = this._dataItems.indexOf(aDataItem);
this._dataItems.splice(itemIndex, 1);
this._updateViews();
},
getViewItem: function DSD_getViewItem(aDataItem)
{
let self = this;
return Object.freeze({
onStateChange: function DIVI_onStateChange(aOldState)
{
// Since the state of a download changed, reset the estimated time left.
self._lastRawTimeLeft = -1;
self._lastTimeLeft = -1;
self._updateViews();
},
onProgressChange: function DIVI_onProgressChange()
{
self._updateViews();
}
});
},
//////////////////////////////////////////////////////////////////////////////
//// Propagation of properties to our views
/**
* Computes aggregate values and propagates the changes to our views.
*/
_updateViews: function DSD_updateViews()
{
// Do not update the status indicators during batch loads of download items.
if (this._loading) {
return;
}
this._refreshProperties();
this._views.forEach(this._updateView, this);
},
/**
* Updates the specified view with the current aggregate values.
*
* @param aView
* DownloadsIndicatorView object to be updated.
*/
_updateView: function DSD_updateView(aView)
{
aView.showingProgress = this._showingProgress;
aView.percentComplete = this._percentComplete;
aView.description = this._description;
aView.details = this._details;
},
//////////////////////////////////////////////////////////////////////////////
//// Property updating based on current download status
/**
* A generator function for the dataItems that this summary is currently
* interested in. This generator is passed off to summarizeDownloads in order
* to generate statistics about the dataItems we care about - in this case,
* it's the dataItems in this._dataItems after the first few to exclude,
* which was set when constructing this DownloadsSummaryData instance.
*/
_dataItemsForSummary: function DSD_dataItemsForSummary()
{
if (this._dataItems.length > 0) {
for (let i = this._numToExclude; i < this._dataItems.length; ++i) {
yield this._dataItems[i];
}
}
},
/**
* Computes aggregate values based on the current state of downloads.
*/
_refreshProperties: function DSD_refreshProperties()
{
// Pre-load summary with default values.
let summary =
DownloadsCommon.summarizeDownloads(this._dataItemsForSummary());
this._description = DownloadsCommon.strings
.otherDownloads2(summary.numActive);
this._percentComplete = summary.percentComplete;
// If all downloads are paused, show the progress indicator as paused.
this._showingProgress = summary.numDownloading > 0 ||
summary.numPaused > 0;
// Display the estimated time left, if present.
if (summary.rawTimeLeft == -1) {
// There are no downloads with a known time left.
this._lastRawTimeLeft = -1;
this._lastTimeLeft = -1;
this._details = "";
} else {
// Compute the new time left only if state actually changed.
if (this._lastRawTimeLeft != summary.rawTimeLeft) {
this._lastRawTimeLeft = summary.rawTimeLeft;
this._lastTimeLeft = DownloadsCommon.smoothSeconds(summary.rawTimeLeft,
this._lastTimeLeft);
}
[this._details] = DownloadUtils.getDownloadStatusNoRate(
summary.totalTransferred, summary.totalSize, summary.slowestSpeed,
this._lastTimeLeft);
}
}
}
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