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authorThomas Groman <tgroman@nuegia.net>2019-12-16 19:48:42 -0800
committerThomas Groman <tgroman@nuegia.net>2019-12-16 19:48:42 -0800
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 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 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, "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, "PlacesUtils",
+ "resource://gre/modules/PlacesUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Promise",
+ "resource://gre/modules/Promise.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "DownloadsLogger",
+ "resource:///modules/DownloadsLogger.jsm");
+
+const nsIDM = Ci.nsIDownloadManager;
+
+const kDownloadsStringBundleUrl =
+ "chrome://browser/locale/downloads/downloads.properties";
+
+const kPrefConfirmOpenExe = "browser.download.confirmOpenExecutable";
+
+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: 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 = {
+ 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 the full Download Manager window interface
+ * instead of the simplified panel interface. The behavior of downloads
+ * across browsing session is consistent with the selected interface.
+ */
+ get useToolkitUI()
+ {
+ /* Toolkit UI is currently incompatible.
+ * FIXME: Either fix the toolkitUI (make DBConnection work) or remove
+ * the unused code altogether
+ */
+ //try {
+ // return Services.prefs.getBoolPref("browser.download.useToolkitUI");
+ //} catch (ex) { }
+ return false;
+ },
+
+ /**
+ * 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 data link for both the private and non-private downloads
+ * data objects.
+ *
+ * @param aDownloadManagerService
+ * Reference to the service implementing nsIDownloadManager. We need
+ * this because getService isn't available for us when this method is
+ * called, and we must ensure to register our listeners before the
+ * getService call for the Download Manager returns.
+ */
+ initializeAllDataLinks: function DC_initializeAllDataLinks(aDownloadManagerService) {
+ DownloadsData.initializeDataLink(aDownloadManagerService);
+ PrivateDownloadsData.initializeDataLink(aDownloadManagerService);
+ },
+
+ /**
+ * Terminates the data link for both the private and non-private downloads
+ * data objects.
+ */
+ terminateAllDataLinks: function DC_terminateAllDataLinks() {
+ DownloadsData.terminateDataLink();
+ PrivateDownloadsData.terminateDataLink();
+ },
+
+ /**
+ * Reloads the specified kind of downloads from the non-private store.
+ * This method must only be called when Private Browsing Mode is disabled.
+ *
+ * @param aActiveOnly
+ * True to load only active downloads from the database.
+ */
+ ensureAllPersistentDataLoaded:
+ function DC_ensureAllPersistentDataLoaded(aActiveOnly) {
+ DownloadsData.ensurePersistentDataLoaded(aActiveOnly);
+ },
+
+ /**
+ * 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,
+
+ /**
+ * 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: 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.
+ 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: 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");
+
+#ifdef XP_WIN
+ // On Windows, the system will provide a native confirmation prompt
+ // for .exe files. Exclude this from our prompt, but prompt on other
+ // executable types.
+ let isWindowsExe = aFile.leafName.toLowerCase().endsWith(".exe");
+#else
+ let isWindowsExe = false;
+#endif
+
+ // Confirm opening executable files if required.
+ if (aFile.isExecutable() && !isWindowsExe) {
+ let showAlert = true;
+ try {
+ showAlert = Services.prefs.getBoolPref(kPrefConfirmOpenExe);
+ } catch (ex) {
+ // If the preference does not exist, continue with the prompt.
+ }
+
+ if (showAlert) {
+ let name = aFile.leafName;
+ let message =
+ DownloadsCommon.strings.fileExecutableSecurityWarning(name, name);
+ let title =
+ DownloadsCommon.strings.fileExecutableSecurityWarningTitle;
+
+ let open = Services.prompt.confirm(aOwnerWindow, title, message);
+ if (!open) {
+ 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));
+ }
+ },
+
+ /**
+ * Show a downloaded file in the system file manager.
+ *
+ * @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));
+ }
+ }
+ }
+ }
+};
+
+/**
+ * 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;
+});
+
+/**
+ * Returns true to indicate that we should hook the panel to the JavaScript API
+ * for downloads instead of the nsIDownloadManager back-end.
+ * This is kept for compatibility/leftovers and should be removed later.
+ */
+XPCOMUtils.defineLazyGetter(DownloadsCommon, "useJSTransfer", function () {
+ return true;
+});
+
+////////////////////////////////////////////////////////////////////////////////
+//// 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,
+
+ /**
+ * Stops receiving events for current downloads and cancels any pending read.
+ */
+ terminateDataLink: function DD_terminateDataLink()
+ {
+ Cu.reportError("terminateDataLink not applicable with JS Transfers");
+ return;
+ },
+
+ /**
+ * Iterator for all the available Download objects. This is empty until the
+ * data has been loaded using the JavaScript API for downloads.
+ */
+ get downloads() 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: 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(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;
+ }
+
+ 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: 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.
+ // Tycho:
+ //let loadedItemsArray = [dataItem
+ // for each (dataItem in this.dataItems)
+ // if (dataItem)];
+ 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 unless loading is in progress.
+ if (!this._pendingStatement) {
+ aView.onDataLoadCompleted();
+ }
+ },
+
+ //////////////////////////////////////////////////////////////////////////////
+ //// In-memory downloads data store
+
+ /**
+ * Clears the loaded data.
+ */
+ clear: function DD_clear()
+ {
+ this._terminateDataAccess();
+ this.dataItems = {};
+ },
+
+ /**
+ * Returns the data item associated with the provided source object. The
+ * source can be a download object that we received from the Download Manager
+ * because of a real-time notification, or a row from the downloads database,
+ * during the asynchronous data load.
+ *
+ * In case we receive download status notifications while we are still
+ * populating the list of downloads from the database, we want the real-time
+ * status to take precedence over the state that is read from the database,
+ * which might be older. This is achieved by creating the download item if
+ * it's not already in the list, but never updating the returned object using
+ * the data from the database, if the object already exists.
+ *
+ * @param aSource
+ * Object containing the data with which the item should be initialized
+ * if it doesn't already exist in the list. This should implement
+ * either nsIDownload or mozIStorageRow. If the item exists, this
+ * argument is only used to retrieve the download identifier.
+ * @param aMayReuseGUID
+ * If false, indicates that the download should not be added if a
+ * download with the same identifier was removed in the meantime. This
+ * ensures that, while loading the list asynchronously, downloads that
+ * have been removed in the meantime do no reappear inadvertently.
+ *
+ * @return New or existing data item, or null if the item was deleted from the
+ * list of available downloads.
+ */
+ _getOrAddDataItem: function DD_getOrAddDataItem(aSource, aMayReuseGUID)
+ {
+ let downloadGuid = (aSource instanceof Ci.nsIDownload)
+ ? aSource.guid
+ : aSource.getResultByName("guid");
+ if (downloadGuid in this.dataItems) {
+ let existingItem = this.dataItems[downloadGuid];
+ if (existingItem || !aMayReuseGUID) {
+ // Returns null if the download was removed and we can't reuse the item.
+ return existingItem;
+ }
+ }
+ DownloadsCommon.log("Creating a new DownloadsDataItem with downloadGuid =",
+ downloadGuid);
+ let dataItem = new DownloadsDataItem(aSource);
+ this.dataItems[downloadGuid] = dataItem;
+
+ // Create the view items before returning.
+ let addToStartOfList = aSource instanceof Ci.nsIDownload;
+ this._views.forEach(
+ function (view) view.onDataItemAdded(dataItem, addToStartOfList)
+ );
+ return dataItem;
+ },
+
+ /**
+ * Removes the data item with the specified identifier.
+ *
+ * This method can be called at most once per download identifier.
+ */
+ _removeDataItem: function DD_removeDataItem(aDownloadId)
+ {
+ if (aDownloadId in this.dataItems) {
+ let dataItem = this.dataItems[aDownloadId];
+ this.dataItems[aDownloadId] = null;
+ this._views.forEach(
+ function (view) view.onDataItemRemoved(dataItem)
+ );
+ }
+ },
+
+ //////////////////////////////////////////////////////////////////////////////
+ //// Persistent data loading
+
+ /**
+ * Represents an executing statement, allowing its cancellation.
+ */
+ _pendingStatement: null,
+
+ /**
+ * Indicates which kind of items from the persistent downloads database have
+ * been fully loaded in memory and are available to the views. This can
+ * assume the value of one of the kLoad constants.
+ */
+ _loadState: 0,
+
+ /** No downloads have been fully loaded yet. */
+ get kLoadNone() 0,
+ /** All the active downloads in the database are loaded in memory. */
+ get kLoadActive() 1,
+ /** All the downloads in the database are loaded in memory. */
+ get kLoadAll() 2,
+
+ /**
+ * Reloads the specified kind of downloads from the persistent database. This
+ * method must only be called when Private Browsing Mode is disabled.
+ *
+ * @param aActiveOnly
+ * True to load only active downloads from the database.
+ */
+ ensurePersistentDataLoaded:
+ function DD_ensurePersistentDataLoaded(aActiveOnly)
+ {
+ if (this == PrivateDownloadsData) {
+ Cu.reportError("ensurePersistentDataLoaded should not be called on PrivateDownloadsData");
+ return;
+ }
+
+ if (this._pendingStatement) {
+ // We are already in the process of reloading all downloads.
+ return;
+ }
+
+ if (aActiveOnly) {
+ if (this._loadState == this.kLoadNone) {
+ DownloadsCommon.log("Loading only active downloads from the persistence database");
+ // Indicate to the views that a batch loading operation is in progress.
+ this._views.forEach(
+ function (view) view.onDataLoadStarting()
+ );
+
+ // Reload the list using the Download Manager service. The list is
+ // returned in no particular order.
+ let downloads = Services.downloads.activeDownloads;
+ while (downloads.hasMoreElements()) {
+ let download = downloads.getNext().QueryInterface(Ci.nsIDownload);
+ this._getOrAddDataItem(download, true);
+ }
+ this._loadState = this.kLoadActive;
+
+ // Indicate to the views that the batch loading operation is complete.
+ this._views.forEach(
+ function (view) view.onDataLoadCompleted()
+ );
+ DownloadsCommon.log("Active downloads done loading.");
+ }
+ } else {
+ if (this._loadState != this.kLoadAll) {
+ // Load only the relevant columns from the downloads database. The
+ // columns are read in the _initFromDataRow method of DownloadsDataItem.
+ // Order by descending download identifier so that the most recent
+ // downloads are notified first to the listening views.
+ DownloadsCommon.log("Loading all downloads from the persistence database.");
+ let dbConnection = Services.downloads.DBConnection;
+ let statement = dbConnection.createAsyncStatement(
+ "SELECT guid, target, name, source, referrer, state, "
+ + "startTime, endTime, currBytes, maxBytes "
+ + "FROM moz_downloads "
+ + "ORDER BY startTime DESC"
+ );
+ try {
+ this._pendingStatement = statement.executeAsync(this);
+ } finally {
+ statement.finalize();
+ }
+ }
+ }
+ },
+
+ /**
+ * Cancels any pending data access and ensures views are notified.
+ */
+ _terminateDataAccess: function DD_terminateDataAccess()
+ {
+ if (this._pendingStatement) {
+ this._pendingStatement.cancel();
+ this._pendingStatement = null;
+ }
+
+ // Close all the views on the current data. Create a copy of the array
+ // because some views might unregister while processing this event.
+ Array.slice(this._views, 0).forEach(
+ function (view) view.onDataInvalidated()
+ );
+ },
+
+ //////////////////////////////////////////////////////////////////////////////
+ //// mozIStorageStatementCallback
+
+ handleResult: function DD_handleResult(aResultSet)
+ {
+ for (let row = aResultSet.getNextRow();
+ row;
+ row = aResultSet.getNextRow()) {
+ // Add the download to the list and initialize it with the data we read,
+ // unless we already received a notification providing more reliable
+ // information for this download.
+ this._getOrAddDataItem(row, false);
+ }
+ },
+
+ handleError: function DD_handleError(aError)
+ {
+ DownloadsCommon.error("Database statement execution error (",
+ aError.result, "): ", aError.message);
+ },
+
+ handleCompletion: function DD_handleCompletion(aReason)
+ {
+ DownloadsCommon.log("Loading all downloads from database completed with reason:",
+ aReason);
+ this._pendingStatement = null;
+
+ // To ensure that we don't inadvertently delete more downloads from the
+ // database than needed on shutdown, we should update the load state only if
+ // the operation completed successfully.
+ if (aReason == Ci.mozIStorageStatementCallback.REASON_FINISHED) {
+ this._loadState = this.kLoadAll;
+ }
+
+ // Indicate to the views that the batch loading operation is complete, even
+ // if the lookup failed or was canceled. The only possible glitch happens
+ // in case the database backend changes while loading data, when the views
+ // would open and immediately close. This case is rare enough not to need a
+ // special treatment.
+ this._views.forEach(
+ function (view) view.onDataLoadCompleted()
+ );
+ },
+
+ //////////////////////////////////////////////////////////////////////////////
+ //// nsIObserver
+
+ observe: function DD_observe(aSubject, aTopic, aData)
+ {
+ switch (aTopic) {
+ case "download-manager-remove-download-guid":
+ // If a single download was removed, remove the corresponding data item.
+ if (aSubject) {
+ let downloadGuid = aSubject.QueryInterface(Ci.nsISupportsCString).data;
+ DownloadsCommon.log("A single download with id",
+ downloadGuid, "was removed.");
+ this._removeDataItem(downloadGuid);
+ break;
+ }
+
+ // Multiple downloads have been removed. Iterate over known downloads
+ // and remove those that don't exist anymore.
+ DownloadsCommon.log("Multiple downloads were removed.");
+ for each (let dataItem in this.dataItems) {
+ if (dataItem) {
+ // Bug 449811 - We have to bind to the dataItem because Javascript
+ // doesn't do fresh let-bindings per loop iteration.
+ let dataItemBinding = dataItem;
+ Services.downloads.getDownloadByGUID(dataItemBinding.downloadGuid,
+ function(aStatus, aResult) {
+ if (aStatus == Components.results.NS_ERROR_NOT_AVAILABLE) {
+ DownloadsCommon.log("Removing download with id",
+ dataItemBinding.downloadGuid);
+ this._removeDataItem(dataItemBinding.downloadGuid);
+ }
+ }.bind(this));
+ }
+ }
+ break;
+ }
+ },
+
+ //////////////////////////////////////////////////////////////////////////////
+ //// nsIDownloadProgressListener
+
+ onDownloadStateChange: function DD_onDownloadStateChange(aOldState, aDownload)
+ {
+ if (aDownload.isPrivate != this._isPrivate) {
+ // Ignore the downloads with a privacy status other than what we are
+ // tracking.
+ return;
+ }
+
+ // When a new download is added, it may have the same identifier of a
+ // download that we previously deleted during this session, and we also
+ // want to provide a visible indication that the download started.
+ let isNew = aOldState == nsIDM.DOWNLOAD_NOTSTARTED ||
+ aOldState == nsIDM.DOWNLOAD_QUEUED;
+
+ let dataItem = this._getOrAddDataItem(aDownload, isNew);
+ if (!dataItem) {
+ return;
+ }
+
+ let wasInProgress = dataItem.inProgress;
+
+ DownloadsCommon.log("A download changed its state to:", aDownload.state);
+ dataItem.state = aDownload.state;
+ dataItem.referrer = aDownload.referrer && aDownload.referrer.spec;
+ dataItem.resumable = aDownload.resumable;
+ dataItem.startTime = Math.round(aDownload.startTime / 1000);
+ dataItem.currBytes = aDownload.amountTransferred;
+ dataItem.maxBytes = aDownload.size;
+
+ if (wasInProgress && !dataItem.inProgress) {
+ dataItem.endTime = Date.now();
+ }
+
+ // When a download is retried, we create a different download object from
+ // the database with the same ID as before. This means that the nsIDownload
+ // that the dataItem holds might now need updating.
+ //
+ // We only overwrite this in the event that _download exists, because if it
+ // doesn't, that means that no caller ever tried to get the nsIDownload,
+ // which means it was never retrieved and doesn't need to be overwritten.
+ if (dataItem._download) {
+ dataItem._download = aDownload;
+ }
+
+ for (let view of this._views) {
+ try {
+ view.getViewItem(dataItem).onStateChange(aOldState);
+ } catch (ex) {
+ Cu.reportError(ex);
+ }
+ }
+
+ if (isNew && !dataItem.newDownloadNotified) {
+ dataItem.newDownloadNotified = true;
+ this._notifyDownloadEvent("start");
+ }
+
+ // This is a final state of which we are only notified once.
+ if (dataItem.done) {
+ this._notifyDownloadEvent("finish");
+ }
+
+ // TODO Bug 830415: this isn't the right place to set these annotation.
+ // It should be set it in places' nsIDownloadHistory implementation.
+ if (!this._isPrivate && !dataItem.inProgress) {
+ let downloadMetaData = { state: dataItem.state,
+ endTime: dataItem.endTime };
+ if (dataItem.done)
+ downloadMetaData.fileSize = dataItem.maxBytes;
+
+ try {
+ PlacesUtils.annotations.setPageAnnotation(
+ NetUtil.newURI(dataItem.uri), "downloads/metaData", JSON.stringify(downloadMetaData), 0,
+ PlacesUtils.annotations.EXPIRE_WITH_HISTORY);
+ }
+ catch(ex) {
+ Cu.reportError(ex);
+ }
+ }
+ },
+
+ onProgressChange: function DD_onProgressChange(aWebProgress, aRequest,
+ aCurSelfProgress,
+ aMaxSelfProgress,
+ aCurTotalProgress,
+ aMaxTotalProgress, aDownload)
+ {
+ if (aDownload.isPrivate != this._isPrivate) {
+ // Ignore the downloads with a privacy status other than what we are
+ // tracking.
+ return;
+ }
+
+ let dataItem = this._getOrAddDataItem(aDownload, false);
+ if (!dataItem) {
+ return;
+ }
+
+ dataItem.currBytes = aDownload.amountTransferred;
+ dataItem.maxBytes = aDownload.size;
+ dataItem.speed = aDownload.speed;
+ dataItem.percentComplete = aDownload.percentComplete;
+
+ this._views.forEach(
+ function (view) view.getViewItem(dataItem).onProgressChange()
+ );
+ },
+
+ onStateChange: function () { },
+
+ onSecurityChange: function () { },
+
+ //////////////////////////////////////////////////////////////////////////////
+ //// 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.");
+ if (DownloadsCommon.useToolkitUI) {
+ DownloadsCommon.log("Cancelling notification - we're using the toolkit downloads manager.");
+ return;
+ }
+
+ // 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: 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 the downloads database becomes unavailable (for example, we
+ * entered Private Browsing Mode and the database backend changed).
+ * References to existing data should be discarded.
+ *
+ * @note Subclasses should override this.
+ */
+ onDataInvalidated: function DVP_onDataInvalidated()
+ {
+ throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
+ },
+
+ /**
+ * 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: 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
+
+ onDataLoadCompleted: function DID_onDataLoadCompleted()
+ {
+ DownloadsViewPrototype.onDataLoadCompleted.call(this);
+ this._updateViews();
+ },
+
+ /**
+ * Called when the downloads database becomes unavailable (for example, we
+ * entered Private Browsing Mode and the database backend changed).
+ * References to existing data should be discarded.
+ */
+ onDataInvalidated: function DID_onDataInvalidated()
+ {
+ this._itemCount = 0;
+ },
+
+ onDownloadAdded(download, newest) {
+ this._itemCount++;
+ this._updateViews();
+ },
+
+ onDownloadStateChanged(download) {
+ if (download.succeeded || download.error) {
+ this.attention = true;
+ }
+
+ // 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: 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 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: function DID_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: function DSD_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: function DSD_onDataLoadCompleted()
+ {
+ DownloadsViewPrototype.onDataLoadCompleted.call(this);
+ this._updateViews();
+ },
+
+ onDataInvalidated: function DSD_onDataInvalidated()
+ {
+ this._dataItems = [];
+ },
+
+ 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: 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 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: function DSD_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);
+ }
+ }
+}