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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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tree10027f336435511475e392454359edea8e25895d /browser/components/downloads/DownloadsCommon.jsm
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Add m-esr52 at 52.6.0
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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
+ * Downloads API data, and provides asynchronous notifications allowing
+ * to build a consistent view of the available data.
+ *
+ * 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 { classes: Cc, interfaces: Ci, utils: Cu, results: Cr } = Components;
+
+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, "FileUtils",
+ "resource://gre/modules/FileUtils.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.defineLazyGetter(this, "DownloadsLogger", () => {
+ let { ConsoleAPI } = Cu.import("resource://gre/modules/Console.jsm", {});
+ let consoleOptions = {
+ maxLogLevelPref: "browser.download.loglevel",
+ prefix: "Downloads"
+ };
+ return new ConsoleAPI(consoleOptions);
+});
+
+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
+};
+
+const kPartialDownloadSuffix = ".part";
+
+const kPrefBranch = Services.prefs.getBranch("browser.download.");
+
+var PrefObserver = {
+ QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver,
+ Ci.nsISupportsWeakReference]),
+ getPref(name) {
+ try {
+ switch (typeof this.prefs[name]) {
+ case "boolean":
+ return kPrefBranch.getBoolPref(name);
+ }
+ } catch (ex) { }
+ return this.prefs[name];
+ },
+ observe(aSubject, aTopic, aData) {
+ if (this.prefs.hasOwnProperty(aData)) {
+ delete this[aData];
+ return this[aData] = this.getPref(aData);
+ }
+ },
+ 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
+ animateNotifications: true,
+ showPanelDropmarker: 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 = {
+ ATTENTION_NONE: "",
+ ATTENTION_SUCCESS: "success",
+ ATTENTION_WARNING: "warning",
+ ATTENTION_SEVERE: "severe",
+
+ /**
+ * 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(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;
+ },
+
+ /**
+ * Indicates whether we should show the dropmarker in the Downloads Panel.
+ */
+ get showPanelDropmarker() {
+ return PrefObserver.showPanelDropmarker;
+ },
+
+ /**
+ * 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(aWindow) {
+ if (PrivateBrowsingUtils.isContentWindowPrivate(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() {
+ 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(aWindow) {
+ if (PrivateBrowsingUtils.isContentWindowPrivate(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(aWindow, aNumToExclude) {
+ if (PrivateBrowsingUtils.isContentWindowPrivate(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,
+
+ /**
+ * Returns the legacy state integer value for the provided Download object.
+ */
+ stateOfDownload(download) {
+ // Collapse state using the correct priority.
+ if (!download.stopped) {
+ return nsIDM.DOWNLOAD_DOWNLOADING;
+ }
+ if (download.succeeded) {
+ return nsIDM.DOWNLOAD_FINISHED;
+ }
+ if (download.error) {
+ if (download.error.becauseBlockedByParentalControls) {
+ return nsIDM.DOWNLOAD_BLOCKED_PARENTAL;
+ }
+ if (download.error.becauseBlockedByReputationCheck) {
+ return nsIDM.DOWNLOAD_DIRTY;
+ }
+ return nsIDM.DOWNLOAD_FAILED;
+ }
+ if (download.canceled) {
+ if (download.hasPartialData) {
+ return nsIDM.DOWNLOAD_PAUSED;
+ }
+ return nsIDM.DOWNLOAD_CANCELED;
+ }
+ return nsIDM.DOWNLOAD_NOTSTARTED;
+ },
+
+ /**
+ * Helper function required because the Downloads Panel and the Downloads View
+ * don't share the controller yet.
+ */
+ removeAndFinalizeDownload(download) {
+ Downloads.getList(Downloads.ALL)
+ .then(list => list.remove(download))
+ .then(() => download.finalize(true))
+ .catch(Cu.reportError);
+ },
+
+ /**
+ * Given an iterable collection of Download objects, generates and returns
+ * statistics about that collection.
+ *
+ * @param downloads An iterable collection of Download objects.
+ *
+ * @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.
+ * 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(downloads) {
+ let summary = {
+ numActive: 0,
+ numPaused: 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
+ // download.
+ slowestSpeed: Infinity,
+ rawTimeLeft: -1,
+ percentComplete: -1
+ }
+
+ for (let download of downloads) {
+ summary.numActive++;
+
+ if (!download.stopped) {
+ summary.numDownloading++;
+ if (download.hasProgress && download.speed > 0) {
+ let sizeLeft = download.totalBytes - download.currentBytes;
+ summary.rawTimeLeft = Math.max(summary.rawTimeLeft,
+ sizeLeft / download.speed);
+ summary.slowestSpeed = Math.min(summary.slowestSpeed,
+ download.speed);
+ }
+ } else if (download.canceled && download.hasPartialData) {
+ summary.numPaused++;
+ }
+
+ // Only add to total values if we actually know the download size.
+ if (download.succeeded) {
+ summary.totalSize += download.target.size;
+ summary.totalTransferred += download.target.size;
+ } else if (download.hasProgress) {
+ summary.totalSize += download.totalBytes;
+ summary.totalTransferred += download.currentBytes;
+ }
+ }
+
+ if (summary.totalSize != 0) {
+ 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(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.
+ 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.
+ *
+ * @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(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.
+ *
+ * @param aFile
+ * a downloaded file.
+ */
+ 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) {
+ this.showDirectory(parent);
+ }
+ }
+ },
+
+ /**
+ * Show the specified folder in the system file manager.
+ *
+ * @param aDirectory
+ * a directory to be opened with system file manager.
+ */
+ showDirectory(aDirectory) {
+ if (!(aDirectory instanceof Ci.nsIFile)) {
+ throw new Error("aDirectory must be a nsIFile object");
+ }
+ try {
+ aDirectory.launch();
+ } catch (ex) {
+ // If launch fails (probably because it's not implemented), let
+ // the OS handler try to open the directory.
+ Cc["@mozilla.org/uriloader/external-protocol-service;1"]
+ .getService(Ci.nsIExternalProtocolService)
+ .loadUrl(NetUtil.newURI(aDirectory));
+ }
+ },
+
+ /**
+ * Displays an alert message box which asks the user if they want to
+ * unblock the downloaded file or not.
+ *
+ * @param options
+ * An object with the following properties:
+ * {
+ * verdict:
+ * The detailed reason why the download was blocked, according to
+ * the "Downloads.Error.BLOCK_VERDICT_" constants. If an unknown
+ * reason is specified, "Downloads.Error.BLOCK_VERDICT_MALWARE" is
+ * assumed.
+ * window:
+ * The window with which this action is associated.
+ * dialogType:
+ * String that determines which actions are available:
+ * - "unblock" to offer just "unblock".
+ * - "chooseUnblock" to offer "unblock" and "confirmBlock".
+ * - "chooseOpen" to offer "open" and "confirmBlock".
+ * }
+ *
+ * @return {Promise}
+ * @resolves String representing the action that should be executed:
+ * - "open" to allow the download and open the file.
+ * - "unblock" to allow the download without opening the file.
+ * - "confirmBlock" to delete the blocked data permanently.
+ * - "cancel" to do nothing and cancel the operation.
+ */
+ confirmUnblockDownload: Task.async(function* ({ verdict, window,
+ dialogType }) {
+ let s = DownloadsCommon.strings;
+
+ // All the dialogs have an action button and a cancel button, while only
+ // some of them have an additonal button to remove the file. The cancel
+ // button must always be the one at BUTTON_POS_1 because this is the value
+ // returned by confirmEx when using ESC or closing the dialog (bug 345067).
+ let title = s.unblockHeaderUnblock;
+ let firstButtonText = s.unblockButtonUnblock;
+ let firstButtonAction = "unblock";
+ let buttonFlags =
+ (Ci.nsIPrompt.BUTTON_TITLE_IS_STRING * Ci.nsIPrompt.BUTTON_POS_0) +
+ (Ci.nsIPrompt.BUTTON_TITLE_CANCEL * Ci.nsIPrompt.BUTTON_POS_1);
+
+ switch (dialogType) {
+ case "unblock":
+ // Use only the unblock action. The default is to cancel.
+ buttonFlags += Ci.nsIPrompt.BUTTON_POS_1_DEFAULT;
+ break;
+ case "chooseUnblock":
+ // Use the unblock and remove file actions. The default is remove file.
+ buttonFlags +=
+ (Ci.nsIPrompt.BUTTON_TITLE_IS_STRING * Ci.nsIPrompt.BUTTON_POS_2) +
+ Ci.nsIPrompt.BUTTON_POS_2_DEFAULT;
+ break;
+ case "chooseOpen":
+ // Use the unblock and open file actions. The default is open file.
+ title = s.unblockHeaderOpen;
+ firstButtonText = s.unblockButtonOpen;
+ firstButtonAction = "open";
+ buttonFlags +=
+ (Ci.nsIPrompt.BUTTON_TITLE_IS_STRING * Ci.nsIPrompt.BUTTON_POS_2) +
+ Ci.nsIPrompt.BUTTON_POS_0_DEFAULT;
+ break;
+ default:
+ Cu.reportError("Unexpected dialog type: " + dialogType);
+ return "cancel";
+ }
+
+ let message;
+ switch (verdict) {
+ case Downloads.Error.BLOCK_VERDICT_UNCOMMON:
+ message = s.unblockTypeUncommon2;
+ break;
+ case Downloads.Error.BLOCK_VERDICT_POTENTIALLY_UNWANTED:
+ message = s.unblockTypePotentiallyUnwanted2;
+ break;
+ default: // Assume Downloads.Error.BLOCK_VERDICT_MALWARE
+ message = s.unblockTypeMalware;
+ break;
+ }
+ message += "\n\n" + s.unblockTip2;
+
+ 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(window, title, message, buttonFlags,
+ firstButtonText, null,
+ s.unblockButtonConfirmBlock, null, {});
+ return [firstButtonAction, "cancel", "confirmBlock"][rv];
+ }),
+};
+
+XPCOMUtils.defineLazyGetter(this.DownloadsCommon, "log", () => {
+ return DownloadsLogger.log.bind(DownloadsLogger);
+});
+XPCOMUtils.defineLazyGetter(this.DownloadsCommon, "error", () => {
+ return DownloadsLogger.error.bind(DownloadsLogger);
+});
+
+/**
+ * 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;
+
+ // Contains all the available Download objects and their integer state.
+ this.oldDownloadStates = new Map();
+
+ // Array of view objects that should be notified when the available download
+ // data changes.
+ this._views = [];
+}
+
+DownloadsDataCtor.prototype = {
+ /**
+ * Starts receiving events for current downloads.
+ */
+ initializeDataLink() {
+ 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,
+
+ /**
+ * Iterator for all the available Download objects. This is empty until the
+ * data has been loaded using the JavaScript API for downloads.
+ */
+ get downloads() {
+ return this.oldDownloadStates.keys();
+ },
+
+ /**
+ * True if there are finished downloads that can be removed from the list.
+ */
+ get canRemoveFinished() {
+ for (let download of this.downloads) {
+ // Stopped, paused, and failed downloads with partial data are removed.
+ if (download.stopped && !(download.canceled && download.hasPartialData)) {
+ return true;
+ }
+ }
+ return false;
+ },
+
+ /**
+ * Asks the back-end to remove finished downloads from the list.
+ */
+ removeFinished() {
+ let promiseList = Downloads.getList(this._isPrivate ? Downloads.PRIVATE
+ : Downloads.PUBLIC);
+ promiseList.then(list => list.removeFinished())
+ .then(null, Cu.reportError);
+ let indicatorData = this._isPrivate ? PrivateDownloadsIndicatorData
+ : DownloadsIndicatorData;
+ indicatorData.attention = DownloadsCommon.ATTENTION_NONE;
+ },
+
+ //////////////////////////////////////////////////////////////////////////////
+ //// Integration with the asynchronous Downloads back-end
+
+ onDownloadAdded(download) {
+ // Download objects do not store the end time of downloads, as the Downloads
+ // API does not need to persist this information for all platforms. Once a
+ // download terminates on a Desktop browser, it becomes a history download,
+ // for which the end time is stored differently, as a Places annotation.
+ download.endTime = Date.now();
+
+ this.oldDownloadStates.set(download,
+ DownloadsCommon.stateOfDownload(download));
+
+ for (let view of this._views) {
+ view.onDownloadAdded(download, true);
+ }
+ },
+
+ onDownloadChanged(download) {
+ let oldState = this.oldDownloadStates.get(download);
+ let newState = DownloadsCommon.stateOfDownload(download);
+ this.oldDownloadStates.set(download, newState);
+
+ if (oldState != newState) {
+ if (download.succeeded ||
+ (download.canceled && !download.hasPartialData) ||
+ download.error) {
+ // Store the end time that may be displayed by the views.
+ download.endTime = Date.now();
+
+ // 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) {
+ try {
+ let downloadMetaData = {
+ state: DownloadsCommon.stateOfDownload(download),
+ endTime: download.endTime,
+ };
+ if (download.succeeded) {
+ downloadMetaData.fileSize = download.target.size;
+ }
+ if (download.error && download.error.reputationCheckVerdict) {
+ downloadMetaData.reputationCheckVerdict =
+ download.error.reputationCheckVerdict;
+ }
+
+ PlacesUtils.annotations.setPageAnnotation(
+ NetUtil.newURI(download.source.url),
+ "downloads/metaData",
+ JSON.stringify(downloadMetaData), 0,
+ PlacesUtils.annotations.EXPIRE_WITH_HISTORY);
+ } catch (ex) {
+ Cu.reportError(ex);
+ }
+ }
+ }
+
+ for (let view of this._views) {
+ try {
+ view.onDownloadStateChanged(download);
+ } catch (ex) {
+ Cu.reportError(ex);
+ }
+ }
+
+ if (download.succeeded ||
+ (download.error && download.error.becauseBlocked)) {
+ this._notifyDownloadEvent("finish");
+ }
+ }
+
+ if (!download.newDownloadNotified) {
+ download.newDownloadNotified = true;
+ this._notifyDownloadEvent("start");
+ }
+
+ for (let view of this._views) {
+ view.onDownloadChanged(download);
+ }
+ },
+
+ onDownloadRemoved(download) {
+ this.oldDownloadStates.delete(download);
+
+ for (let view of this._views) {
+ view.onDownloadRemoved(download);
+ }
+ },
+
+ //////////////////////////////////////////////////////////////////////////////
+ //// 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(aView) {
+ this._views.push(aView);
+ this._updateView(aView);
+ },
+
+ /**
+ * Removes an object previously added using addView.
+ *
+ * @param aView
+ * DownloadsView object to be removed.
+ */
+ 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(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 downloadsArray = [...this.downloads];
+ downloadsArray.sort((a, b) => b.startTime - a.startTime);
+ downloadsArray.forEach(download => aView.onDownloadAdded(download, 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(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);
+});
+
+////////////////////////////////////////////////////////////////////////////////
+//// 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(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(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(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() {
+ this._loading = true;
+ },
+
+ /**
+ * Called after data loading finished.
+ */
+ 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 download
+ * Download object that was just added.
+ * @param newest
+ * 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.
+ */
+ onDownloadAdded(download, newest) {
+ throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
+ },
+
+ /**
+ * Called when the overall state of a Download has changed. In particular,
+ * this is called only once when the download succeeds or is blocked
+ * permanently, and is never called if only the current progress changed.
+ *
+ * The onDownloadChanged notification will always be sent afterwards.
+ *
+ * @note Subclasses should override this.
+ */
+ onDownloadStateChanged(download) {
+ throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
+ },
+
+ /**
+ * Called every time any state property of a Download may have changed,
+ * including progress properties.
+ *
+ * Note that progress notification changes are throttled at the Downloads.jsm
+ * API level, and there is no throttling mechanism in the front-end.
+ *
+ * @note Subclasses should override this.
+ */
+ onDownloadChanged(download) {
+ 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 download
+ * Download object that is being removed.
+ *
+ * @note Subclasses should override this.
+ */
+ onDownloadRemoved(download) {
+ 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() {
+ throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
+ },
+
+ /**
+ * Private function used to refresh an individual view.
+ *
+ * @note Subclasses should override this.
+ */
+ _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(aView) {
+ DownloadsViewPrototype.removeView.call(this, aView);
+
+ if (this._views.length == 0) {
+ this._itemCount = 0;
+ }
+ },
+
+ //////////////////////////////////////////////////////////////////////////////
+ //// Callback functions from DownloadsData
+
+ onDataLoadCompleted() {
+ DownloadsViewPrototype.onDataLoadCompleted.call(this);
+ this._updateViews();
+ },
+
+ onDownloadAdded(download, newest) {
+ this._itemCount++;
+ this._updateViews();
+ },
+
+ onDownloadStateChanged(download) {
+ if (!download.succeeded && download.error && download.error.reputationCheckVerdict) {
+ switch (download.error.reputationCheckVerdict) {
+ case Downloads.Error.BLOCK_VERDICT_UNCOMMON: // fall-through
+ case Downloads.Error.BLOCK_VERDICT_POTENTIALLY_UNWANTED:
+ // Existing higher level attention indication trumps ATTENTION_WARNING.
+ if (this._attention != DownloadsCommon.ATTENTION_SEVERE) {
+ this.attention = DownloadsCommon.ATTENTION_WARNING;
+ }
+ break;
+ case Downloads.Error.BLOCK_VERDICT_MALWARE:
+ this.attention = DownloadsCommon.ATTENTION_SEVERE;
+ break;
+ default:
+ this.attention = DownloadsCommon.ATTENTION_SEVERE;
+ Cu.reportError("Unknown reputation verdict: " +
+ download.error.reputationCheckVerdict);
+ }
+ } else if (download.succeeded) {
+ // Existing higher level attention indication trumps ATTENTION_SUCCESS.
+ if (this._attention != DownloadsCommon.ATTENTION_SEVERE &&
+ this._attention != DownloadsCommon.ATTENTION_WARNING) {
+ this.attention = DownloadsCommon.ATTENTION_SUCCESS;
+ }
+ } else if (download.error) {
+ // Existing higher level attention indication trumps ATTENTION_WARNING.
+ if (this._attention != DownloadsCommon.ATTENTION_SEVERE) {
+ this.attention = DownloadsCommon.ATTENTION_WARNING;
+ }
+ }
+
+ // Since the state of a download changed, reset the estimated time left.
+ this._lastRawTimeLeft = -1;
+ this._lastTimeLeft = -1;
+ },
+
+ onDownloadChanged(download) {
+ this._updateViews();
+ },
+
+ onDownloadRemoved(download) {
+ this._itemCount--;
+ this._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: DownloadsCommon.ATTENTION_NONE,
+
+ /**
+ * 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 = DownloadsCommon.ATTENTION_NONE;
+ this._updateViews();
+ return aValue;
+ },
+ _attentionSuppressed: false,
+
+ /**
+ * Computes aggregate values and propagates the changes to our views.
+ */
+ _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(aView) {
+ aView.hasDownloads = this._hasDownloads;
+ aView.counter = this._counter;
+ aView.percentComplete = this._percentComplete;
+ aView.paused = this._paused;
+ aView.attention = this._attentionSuppressed ? DownloadsCommon.ATTENTION_NONE
+ : this._attention;
+ },
+
+ //////////////////////////////////////////////////////////////////////////////
+ //// 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 Download objects this summary is currently
+ * interested in. This generator is passed off to summarizeDownloads in order
+ * to generate statistics about the downloads we care about - in this case,
+ * it's all active downloads.
+ */
+ * _activeDownloads() {
+ let downloads = this._isPrivate ? PrivateDownloadsData.downloads
+ : DownloadsData.downloads;
+ for (let download of downloads) {
+ if (!download.stopped || (download.canceled && download.hasPartialData)) {
+ yield download;
+ }
+ }
+ },
+
+ /**
+ * Computes aggregate values based on the current state of downloads.
+ */
+ _refreshProperties() {
+ let summary =
+ DownloadsCommon.summarizeDownloads(this._activeDownloads());
+
+ // 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._downloads = [];
+
+ // 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(aView) {
+ DownloadsViewPrototype.removeView.call(this, aView);
+
+ if (this._views.length == 0) {
+ // Clear out our collection of Download objects. If we ever have
+ // another view registered with us, this will get re-populated.
+ this._downloads = [];
+ }
+ },
+
+ //////////////////////////////////////////////////////////////////////////////
+ //// Callback functions from DownloadsData - see the documentation in
+ //// DownloadsViewPrototype for more information on what these functions
+ //// are used for.
+
+ onDataLoadCompleted() {
+ DownloadsViewPrototype.onDataLoadCompleted.call(this);
+ this._updateViews();
+ },
+
+ onDownloadAdded(download, newest) {
+ if (newest) {
+ this._downloads.unshift(download);
+ } else {
+ this._downloads.push(download);
+ }
+
+ this._updateViews();
+ },
+
+ onDownloadStateChanged() {
+ // Since the state of a download changed, reset the estimated time left.
+ this._lastRawTimeLeft = -1;
+ this._lastTimeLeft = -1;
+ },
+
+ onDownloadChanged() {
+ this._updateViews();
+ },
+
+ onDownloadRemoved(download) {
+ let itemIndex = this._downloads.indexOf(download);
+ this._downloads.splice(itemIndex, 1);
+ this._updateViews();
+ },
+
+ //////////////////////////////////////////////////////////////////////////////
+ //// Propagation of properties to our views
+
+ /**
+ * Computes aggregate values and propagates the changes to our views.
+ */
+ _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(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 Download objects this summary is currently
+ * interested in. This generator is passed off to summarizeDownloads in order
+ * to generate statistics about the downloads we care about - in this case,
+ * it's the downloads in this._downloads after the first few to exclude,
+ * which was set when constructing this DownloadsSummaryData instance.
+ */
+ * _downloadsForSummary() {
+ if (this._downloads.length > 0) {
+ for (let i = this._numToExclude; i < this._downloads.length; ++i) {
+ yield this._downloads[i];
+ }
+ }
+ },
+
+ /**
+ * Computes aggregate values based on the current state of downloads.
+ */
+ _refreshProperties() {
+ // Pre-load summary with default values.
+ let summary =
+ DownloadsCommon.summarizeDownloads(this._downloadsForSummary());
+
+ 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);
+ }
+ },
+}