791 lines
26 KiB
JavaScript
791 lines
26 KiB
JavaScript
// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
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const Clutter = imports.gi.Clutter;
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const Gdk = imports.gi.Gdk;
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const Gio = imports.gi.Gio;
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const GLib = imports.gi.GLib;
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const Lang = imports.lang;
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const Mainloop = imports.mainloop;
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const Meta = imports.gi.Meta;
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const Shell = imports.gi.Shell;
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const St = imports.gi.St;
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const Components = imports.ui.components;
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const CtrlAltTab = imports.ui.ctrlAltTab;
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const EndSessionDialog = imports.ui.endSessionDialog;
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const Environment = imports.ui.environment;
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const ExtensionSystem = imports.ui.extensionSystem;
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const ExtensionDownloader = imports.ui.extensionDownloader;
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const Keyboard = imports.ui.keyboard;
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const MessageTray = imports.ui.messageTray;
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const OsdWindow = imports.ui.osdWindow;
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const Overview = imports.ui.overview;
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const Panel = imports.ui.panel;
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const Params = imports.misc.params;
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const RunDialog = imports.ui.runDialog;
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const Layout = imports.ui.layout;
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const LoginManager = imports.misc.loginManager;
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const LookingGlass = imports.ui.lookingGlass;
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const NotificationDaemon = imports.ui.notificationDaemon;
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const WindowAttentionHandler = imports.ui.windowAttentionHandler;
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const ScreenShield = imports.ui.screenShield;
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const Scripting = imports.ui.scripting;
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const SessionMode = imports.ui.sessionMode;
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const ShellDBus = imports.ui.shellDBus;
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const ShellMountOperation = imports.ui.shellMountOperation;
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const WindowManager = imports.ui.windowManager;
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const Magnifier = imports.ui.magnifier;
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const XdndHandler = imports.ui.xdndHandler;
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const Util = imports.misc.util;
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const OVERRIDES_SCHEMA = 'org.gnome.shell.overrides';
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const DEFAULT_BACKGROUND_COLOR = Clutter.Color.from_pixel(0x2e3436ff);
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let componentManager = null;
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let panel = null;
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let overview = null;
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let runDialog = null;
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let lookingGlass = null;
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let wm = null;
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let messageTray = null;
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let screenShield = null;
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let notificationDaemon = null;
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let windowAttentionHandler = null;
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let ctrlAltTabManager = null;
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let osdWindow = null;
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let sessionMode = null;
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let shellDBusService = null;
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let shellMountOpDBusService = null;
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let screenSaverDBus = null;
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let modalCount = 0;
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let keybindingMode = Shell.KeyBindingMode.NONE;
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let modalActorFocusStack = [];
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let uiGroup = null;
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let magnifier = null;
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let xdndHandler = null;
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let keyboard = null;
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let layoutManager = null;
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let _startDate;
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let _defaultCssStylesheet = null;
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let _cssStylesheet = null;
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let _overridesSettings = null;
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function _sessionUpdated() {
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_loadDefaultStylesheet();
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wm.setCustomKeybindingHandler('panel-main-menu',
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Shell.KeyBindingMode.NORMAL |
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Shell.KeyBindingMode.OVERVIEW,
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sessionMode.hasOverview ? Lang.bind(overview, overview.toggle) : null);
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wm.allowKeybinding('overlay-key', Shell.KeyBindingMode.NORMAL |
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Shell.KeyBindingMode.OVERVIEW);
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wm.setCustomKeybindingHandler('panel-run-dialog',
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Shell.KeyBindingMode.NORMAL |
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Shell.KeyBindingMode.OVERVIEW,
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sessionMode.hasRunDialog ? openRunDialog : null);
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if (!sessionMode.hasRunDialog && lookingGlass)
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lookingGlass.close();
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}
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function start() {
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// These are here so we don't break compatibility.
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global.logError = window.log;
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global.log = window.log;
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// Chain up async errors reported from C
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global.connect('notify-error', function (global, msg, detail) { notifyError(msg, detail); });
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Gio.DesktopAppInfo.set_desktop_env('GNOME');
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sessionMode = new SessionMode.SessionMode();
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sessionMode.connect('sessions-loaded', _sessionsLoaded);
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sessionMode.init();
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}
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function _sessionsLoaded() {
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sessionMode.connect('updated', _sessionUpdated);
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_initializeUI();
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shellDBusService = new ShellDBus.GnomeShell();
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shellMountOpDBusService = new ShellMountOperation.GnomeShellMountOpHandler();
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_sessionUpdated();
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}
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function _initializeUI() {
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// Ensure ShellWindowTracker and ShellAppUsage are initialized; this will
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// also initialize ShellAppSystem first. ShellAppSystem
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// needs to load all the .desktop files, and ShellWindowTracker
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// will use those to associate with windows. Right now
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// the Monitor doesn't listen for installed app changes
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// and recalculate application associations, so to avoid
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// races for now we initialize it here. It's better to
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// be predictable anyways.
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let tracker = Shell.WindowTracker.get_default();
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Shell.AppUsage.get_default();
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tracker.connect('startup-sequence-changed', _queueCheckWorkspaces);
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_loadDefaultStylesheet();
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// Setup the stage hierarchy early
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layoutManager = new Layout.LayoutManager();
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// Various parts of the codebase still refers to Main.uiGroup
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// instead using the layoutManager. This keeps that code
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// working until it's updated.
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uiGroup = layoutManager.uiGroup;
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xdndHandler = new XdndHandler.XdndHandler();
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ctrlAltTabManager = new CtrlAltTab.CtrlAltTabManager();
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osdWindow = new OsdWindow.OsdWindow();
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overview = new Overview.Overview();
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wm = new WindowManager.WindowManager();
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magnifier = new Magnifier.Magnifier();
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if (LoginManager.canLock())
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screenShield = new ScreenShield.ScreenShield();
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panel = new Panel.Panel();
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messageTray = new MessageTray.MessageTray();
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keyboard = new Keyboard.Keyboard();
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notificationDaemon = new NotificationDaemon.NotificationDaemon();
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windowAttentionHandler = new WindowAttentionHandler.WindowAttentionHandler();
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componentManager = new Components.ComponentManager();
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layoutManager.init();
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overview.init();
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global.screen.override_workspace_layout(Meta.ScreenCorner.TOPLEFT,
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false, -1, 1);
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global.display.connect('overlay-key', Lang.bind(overview, overview.toggle));
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// Provide the bus object for gnome-session to
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// initiate logouts.
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EndSessionDialog.init();
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// We're ready for the session manager to move to the next phase
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Meta.register_with_session();
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_startDate = new Date();
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log('GNOME Shell started at ' + _startDate);
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let perfModuleName = GLib.getenv("SHELL_PERF_MODULE");
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if (perfModuleName) {
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let perfOutput = GLib.getenv("SHELL_PERF_OUTPUT");
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let module = eval('imports.perf.' + perfModuleName + ';');
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Scripting.runPerfScript(module, perfOutput);
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}
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_overridesSettings = new Gio.Settings({ schema: OVERRIDES_SCHEMA });
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_overridesSettings.connect('changed::dynamic-workspaces', _queueCheckWorkspaces);
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global.screen.connect('notify::n-workspaces', _nWorkspacesChanged);
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global.screen.connect('window-entered-monitor', _windowEnteredMonitor);
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global.screen.connect('window-left-monitor', _windowLeftMonitor);
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global.screen.connect('restacked', _windowsRestacked);
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_nWorkspacesChanged();
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ExtensionDownloader.init();
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ExtensionSystem.init();
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if (sessionMode.isGreeter && screenShield) {
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layoutManager.connect('startup-prepared', function() {
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screenShield.showDialog();
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});
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}
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layoutManager.connect('startup-complete', function() {
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if (keybindingMode == Shell.KeyBindingMode.NONE) {
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keybindingMode = Shell.KeyBindingMode.NORMAL;
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}
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});
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}
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let _workspaces = [];
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let _checkWorkspacesId = 0;
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/*
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* When the last window closed on a workspace is a dialog or splash
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* screen, we assume that it might be an initial window shown before
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* the main window of an application, and give the app a grace period
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* where it can map another window before we remove the workspace.
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*/
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const LAST_WINDOW_GRACE_TIME = 1000;
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function _checkWorkspaces() {
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let i;
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let emptyWorkspaces = [];
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if (!Meta.prefs_get_dynamic_workspaces()) {
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_checkWorkspacesId = 0;
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return false;
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}
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for (i = 0; i < _workspaces.length; i++) {
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let lastRemoved = _workspaces[i]._lastRemovedWindow;
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if ((lastRemoved &&
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(lastRemoved.get_window_type() == Meta.WindowType.SPLASHSCREEN ||
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lastRemoved.get_window_type() == Meta.WindowType.DIALOG ||
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lastRemoved.get_window_type() == Meta.WindowType.MODAL_DIALOG)) ||
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_workspaces[i]._keepAliveId)
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emptyWorkspaces[i] = false;
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else
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emptyWorkspaces[i] = true;
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}
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let sequences = Shell.WindowTracker.get_default().get_startup_sequences();
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for (i = 0; i < sequences.length; i++) {
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let index = sequences[i].get_workspace();
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if (index >= 0 && index <= global.screen.n_workspaces)
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emptyWorkspaces[index] = false;
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}
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let windows = global.get_window_actors();
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for (i = 0; i < windows.length; i++) {
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let win = windows[i];
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if (win.get_meta_window().is_on_all_workspaces())
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continue;
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let workspaceIndex = win.get_workspace();
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emptyWorkspaces[workspaceIndex] = false;
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}
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// If we don't have an empty workspace at the end, add one
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if (!emptyWorkspaces[emptyWorkspaces.length -1]) {
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global.screen.append_new_workspace(false, global.get_current_time());
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emptyWorkspaces.push(false);
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}
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let activeWorkspaceIndex = global.screen.get_active_workspace_index();
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let removingCurrentWorkspace = (emptyWorkspaces[activeWorkspaceIndex] &&
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activeWorkspaceIndex < emptyWorkspaces.length - 1);
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// Don't enter the overview when removing multiple empty workspaces at startup
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let showOverview = (removingCurrentWorkspace &&
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!emptyWorkspaces.every(function(x) { return x; }));
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if (removingCurrentWorkspace) {
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// "Merge" the empty workspace we are removing with the one at the end
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wm.blockAnimations();
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}
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// Delete other empty workspaces; do it from the end to avoid index changes
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for (i = emptyWorkspaces.length - 2; i >= 0; i--) {
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if (emptyWorkspaces[i])
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global.screen.remove_workspace(_workspaces[i], global.get_current_time());
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}
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if (removingCurrentWorkspace) {
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global.screen.get_workspace_by_index(global.screen.n_workspaces - 1).activate(global.get_current_time());
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wm.unblockAnimations();
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if (!overview.visible && showOverview)
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overview.show();
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}
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_checkWorkspacesId = 0;
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return false;
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}
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function keepWorkspaceAlive(workspace, duration) {
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if (workspace._keepAliveId)
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Mainloop.source_remove(workspace._keepAliveId);
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workspace._keepAliveId = Mainloop.timeout_add(duration, function() {
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workspace._keepAliveId = 0;
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_queueCheckWorkspaces();
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return false;
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});
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}
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function _windowRemoved(workspace, window) {
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workspace._lastRemovedWindow = window;
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_queueCheckWorkspaces();
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Mainloop.timeout_add(LAST_WINDOW_GRACE_TIME, function() {
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if (workspace._lastRemovedWindow == window) {
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workspace._lastRemovedWindow = null;
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_queueCheckWorkspaces();
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}
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return false;
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});
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}
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function _windowLeftMonitor(metaScreen, monitorIndex, metaWin) {
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// If the window left the primary monitor, that
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// might make that workspace empty
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if (monitorIndex == layoutManager.primaryIndex)
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_queueCheckWorkspaces();
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}
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function _windowEnteredMonitor(metaScreen, monitorIndex, metaWin) {
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// If the window entered the primary monitor, that
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// might make that workspace non-empty
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if (monitorIndex == layoutManager.primaryIndex)
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_queueCheckWorkspaces();
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}
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function _windowsRestacked() {
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// Figure out where the pointer is in case we lost track of
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// it during a grab. (In particular, if a trayicon popup menu
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// is dismissed, see if we need to close the message tray.)
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global.sync_pointer();
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}
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function _queueCheckWorkspaces() {
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if (_checkWorkspacesId == 0)
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_checkWorkspacesId = Meta.later_add(Meta.LaterType.BEFORE_REDRAW, _checkWorkspaces);
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}
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function _nWorkspacesChanged() {
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let oldNumWorkspaces = _workspaces.length;
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let newNumWorkspaces = global.screen.n_workspaces;
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if (oldNumWorkspaces == newNumWorkspaces)
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return false;
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let lostWorkspaces = [];
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if (newNumWorkspaces > oldNumWorkspaces) {
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let w;
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// Assume workspaces are only added at the end
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for (w = oldNumWorkspaces; w < newNumWorkspaces; w++)
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_workspaces[w] = global.screen.get_workspace_by_index(w);
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for (w = oldNumWorkspaces; w < newNumWorkspaces; w++) {
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let workspace = _workspaces[w];
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workspace._windowAddedId = workspace.connect('window-added', _queueCheckWorkspaces);
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workspace._windowRemovedId = workspace.connect('window-removed', _windowRemoved);
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}
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} else {
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// Assume workspaces are only removed sequentially
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// (e.g. 2,3,4 - not 2,4,7)
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let removedIndex;
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let removedNum = oldNumWorkspaces - newNumWorkspaces;
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for (let w = 0; w < oldNumWorkspaces; w++) {
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let workspace = global.screen.get_workspace_by_index(w);
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if (_workspaces[w] != workspace) {
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removedIndex = w;
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break;
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}
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}
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let lostWorkspaces = _workspaces.splice(removedIndex, removedNum);
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lostWorkspaces.forEach(function(workspace) {
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workspace.disconnect(workspace._windowAddedId);
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workspace.disconnect(workspace._windowRemovedId);
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});
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}
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_queueCheckWorkspaces();
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return false;
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}
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function _loadDefaultStylesheet() {
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if (!sessionMode.isPrimary)
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return;
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let stylesheet = global.datadir + '/theme/' + sessionMode.stylesheetName;
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if (_defaultCssStylesheet == stylesheet)
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return;
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_defaultCssStylesheet = stylesheet;
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loadTheme();
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}
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/**
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* getThemeStylesheet:
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*
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* Get the theme CSS file that the shell will load
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*
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* Returns: A file path that contains the theme CSS,
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* null if using the default
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*/
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function getThemeStylesheet()
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{
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return _cssStylesheet;
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}
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/**
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* setThemeStylesheet:
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* @cssStylesheet: A file path that contains the theme CSS,
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* set it to null to use the default
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*
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* Set the theme CSS file that the shell will load
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*/
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function setThemeStylesheet(cssStylesheet)
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{
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_cssStylesheet = cssStylesheet;
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}
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/**
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* loadTheme:
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*
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* Reloads the theme CSS file
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*/
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function loadTheme() {
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let themeContext = St.ThemeContext.get_for_stage (global.stage);
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let previousTheme = themeContext.get_theme();
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let cssStylesheet = _defaultCssStylesheet;
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if (_cssStylesheet != null)
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cssStylesheet = _cssStylesheet;
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let theme = new St.Theme ({ application_stylesheet: cssStylesheet });
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if (previousTheme) {
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let customStylesheets = previousTheme.get_custom_stylesheets();
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for (let i = 0; i < customStylesheets.length; i++)
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theme.load_stylesheet(customStylesheets[i]);
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}
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themeContext.set_theme (theme);
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}
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/**
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* notify:
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* @msg: A message
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* @details: Additional information
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*/
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function notify(msg, details) {
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let source = new MessageTray.SystemNotificationSource();
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messageTray.add(source);
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let notification = new MessageTray.Notification(source, msg, details);
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notification.setTransient(true);
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source.notify(notification);
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}
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/**
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* notifyError:
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* @msg: An error message
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* @details: Additional information
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*
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* See shell_global_notify_problem().
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*/
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function notifyError(msg, details) {
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// Also print to stderr so it's logged somewhere
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if (details)
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log('error: ' + msg + ': ' + details);
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else
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log('error: ' + msg);
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notify(msg, details);
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}
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function _findModal(actor) {
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for (let i = 0; i < modalActorFocusStack.length; i++) {
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if (modalActorFocusStack[i].actor == actor)
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return i;
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}
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return -1;
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}
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/**
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* pushModal:
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* @actor: #ClutterActor which will be given keyboard focus
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* @params: optional parameters
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*
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* Ensure we are in a mode where all keyboard and mouse input goes to
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* the stage, and focus @actor. Multiple calls to this function act in
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* a stacking fashion; the effect will be undone when an equal number
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* of popModal() invocations have been made.
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*
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* Next, record the current Clutter keyboard focus on a stack. If the
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* modal stack returns to this actor, reset the focus to the actor
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* which was focused at the time pushModal() was invoked.
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*
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* @params may be used to provide the following parameters:
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* - timestamp: used to associate the call with a specific user initiated
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* event. If not provided then the value of
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* global.get_current_time() is assumed.
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*
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* - options: Meta.ModalOptions flags to indicate that the pointer is
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* already grabbed
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*
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* - keybindingMode: used to set the current Shell.KeyBindingMode to filter
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* global keybindings; the default of NONE will filter
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* out all keybindings
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*
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* Returns: true iff we successfully acquired a grab or already had one
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*/
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function pushModal(actor, params) {
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params = Params.parse(params, { timestamp: global.get_current_time(),
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options: 0,
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keybindingMode: Shell.KeyBindingMode.NONE });
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if (modalCount == 0) {
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if (!global.begin_modal(params.timestamp, params.options)) {
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log('pushModal: invocation of begin_modal failed');
|
|
return false;
|
|
}
|
|
Meta.disable_unredirect_for_screen(global.screen);
|
|
}
|
|
|
|
global.set_stage_input_mode(Shell.StageInputMode.FULLSCREEN);
|
|
|
|
modalCount += 1;
|
|
let actorDestroyId = actor.connect('destroy', function() {
|
|
let index = _findModal(actor);
|
|
if (index >= 0)
|
|
popModal(actor);
|
|
});
|
|
|
|
let prevFocus = global.stage.get_key_focus();
|
|
let prevFocusDestroyId;
|
|
if (prevFocus != null) {
|
|
prevFocusDestroyId = prevFocus.connect('destroy', function() {
|
|
let index = _findModal(actor);
|
|
if (index >= 0)
|
|
modalActorFocusStack[index].prevFocus = null;
|
|
});
|
|
}
|
|
modalActorFocusStack.push({ actor: actor,
|
|
destroyId: actorDestroyId,
|
|
prevFocus: prevFocus,
|
|
prevFocusDestroyId: prevFocusDestroyId,
|
|
keybindingMode: keybindingMode });
|
|
|
|
keybindingMode = params.keybindingMode;
|
|
global.stage.set_key_focus(actor);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* popModal:
|
|
* @actor: #ClutterActor passed to original invocation of pushModal().
|
|
* @timestamp: optional timestamp
|
|
*
|
|
* Reverse the effect of pushModal(). If this invocation is undoing
|
|
* the topmost invocation, then the focus will be restored to the
|
|
* previous focus at the time when pushModal() was invoked.
|
|
*
|
|
* @timestamp is optionally used to associate the call with a specific user
|
|
* initiated event. If not provided then the value of
|
|
* global.get_current_time() is assumed.
|
|
*/
|
|
function popModal(actor, timestamp) {
|
|
if (timestamp == undefined)
|
|
timestamp = global.get_current_time();
|
|
|
|
let focusIndex = _findModal(actor);
|
|
if (focusIndex < 0) {
|
|
global.stage.set_key_focus(null);
|
|
global.end_modal(timestamp);
|
|
global.set_stage_input_mode(Shell.StageInputMode.NORMAL);
|
|
keybindingMode = Shell.KeyBindingMode.NORMAL;
|
|
|
|
throw new Error('incorrect pop');
|
|
}
|
|
|
|
modalCount -= 1;
|
|
|
|
let record = modalActorFocusStack[focusIndex];
|
|
record.actor.disconnect(record.destroyId);
|
|
|
|
if (focusIndex == modalActorFocusStack.length - 1) {
|
|
if (record.prevFocus)
|
|
record.prevFocus.disconnect(record.prevFocusDestroyId);
|
|
keybindingMode = record.keybindingMode;
|
|
global.stage.set_key_focus(record.prevFocus);
|
|
} else {
|
|
// If we have:
|
|
// global.stage.set_focus(a);
|
|
// Main.pushModal(b);
|
|
// Main.pushModal(c);
|
|
// Main.pushModal(d);
|
|
//
|
|
// then we have the stack:
|
|
// [{ prevFocus: a, actor: b },
|
|
// { prevFocus: b, actor: c },
|
|
// { prevFocus: c, actor: d }]
|
|
//
|
|
// When actor c is destroyed/popped, if we only simply remove the
|
|
// record, then the focus stack will be [a, c], rather than the correct
|
|
// [a, b]. Shift the focus stack up before removing the record to ensure
|
|
// that we get the correct result.
|
|
let t = modalActorFocusStack[modalActorFocusStack.length - 1];
|
|
if (t.prevFocus)
|
|
t.prevFocus.disconnect(t.prevFocusDestroyId);
|
|
// Remove from the middle, shift the focus chain up
|
|
for (let i = modalActorFocusStack.length - 1; i > focusIndex; i--) {
|
|
modalActorFocusStack[i].prevFocus = modalActorFocusStack[i - 1].prevFocus;
|
|
modalActorFocusStack[i].prevFocusDestroyId = modalActorFocusStack[i - 1].prevFocusDestroyId;
|
|
modalActorFocusStack[i].keybindingMode = modalActorFocusStack[i - 1].keybindingMode;
|
|
}
|
|
}
|
|
modalActorFocusStack.splice(focusIndex, 1);
|
|
|
|
if (modalCount > 0)
|
|
return;
|
|
|
|
global.end_modal(timestamp);
|
|
global.set_stage_input_mode(Shell.StageInputMode.NORMAL);
|
|
Meta.enable_unredirect_for_screen(global.screen);
|
|
keybindingMode = Shell.KeyBindingMode.NORMAL;
|
|
}
|
|
|
|
function createLookingGlass() {
|
|
if (lookingGlass == null) {
|
|
lookingGlass = new LookingGlass.LookingGlass();
|
|
}
|
|
return lookingGlass;
|
|
}
|
|
|
|
function openRunDialog() {
|
|
if (runDialog == null) {
|
|
runDialog = new RunDialog.RunDialog();
|
|
}
|
|
runDialog.open();
|
|
}
|
|
|
|
/**
|
|
* activateWindow:
|
|
* @window: the Meta.Window to activate
|
|
* @time: (optional) current event time
|
|
* @workspaceNum: (optional) window's workspace number
|
|
*
|
|
* Activates @window, switching to its workspace first if necessary,
|
|
* and switching out of the overview if it's currently active
|
|
*/
|
|
function activateWindow(window, time, workspaceNum) {
|
|
let activeWorkspaceNum = global.screen.get_active_workspace_index();
|
|
let windowWorkspaceNum = (workspaceNum !== undefined) ? workspaceNum : window.get_workspace().index();
|
|
|
|
if (!time)
|
|
time = global.get_current_time();
|
|
|
|
if (windowWorkspaceNum != activeWorkspaceNum) {
|
|
let workspace = global.screen.get_workspace_by_index(windowWorkspaceNum);
|
|
workspace.activate_with_focus(window, time);
|
|
} else {
|
|
window.activate(time);
|
|
}
|
|
|
|
overview.hide();
|
|
}
|
|
|
|
// TODO - replace this timeout with some system to guess when the user might
|
|
// be e.g. just reading the screen and not likely to interact.
|
|
const DEFERRED_TIMEOUT_SECONDS = 20;
|
|
var _deferredWorkData = {};
|
|
// Work scheduled for some point in the future
|
|
var _deferredWorkQueue = [];
|
|
// Work we need to process before the next redraw
|
|
var _beforeRedrawQueue = [];
|
|
// Counter to assign work ids
|
|
var _deferredWorkSequence = 0;
|
|
var _deferredTimeoutId = 0;
|
|
|
|
function _runDeferredWork(workId) {
|
|
if (!_deferredWorkData[workId])
|
|
return;
|
|
let index = _deferredWorkQueue.indexOf(workId);
|
|
if (index < 0)
|
|
return;
|
|
|
|
_deferredWorkQueue.splice(index, 1);
|
|
_deferredWorkData[workId].callback();
|
|
if (_deferredWorkQueue.length == 0 && _deferredTimeoutId > 0) {
|
|
Mainloop.source_remove(_deferredTimeoutId);
|
|
_deferredTimeoutId = 0;
|
|
}
|
|
}
|
|
|
|
function _runAllDeferredWork() {
|
|
while (_deferredWorkQueue.length > 0)
|
|
_runDeferredWork(_deferredWorkQueue[0]);
|
|
}
|
|
|
|
function _runBeforeRedrawQueue() {
|
|
for (let i = 0; i < _beforeRedrawQueue.length; i++) {
|
|
let workId = _beforeRedrawQueue[i];
|
|
_runDeferredWork(workId);
|
|
}
|
|
_beforeRedrawQueue = [];
|
|
}
|
|
|
|
function _queueBeforeRedraw(workId) {
|
|
_beforeRedrawQueue.push(workId);
|
|
if (_beforeRedrawQueue.length == 1) {
|
|
Meta.later_add(Meta.LaterType.BEFORE_REDRAW, function () {
|
|
_runBeforeRedrawQueue();
|
|
return false;
|
|
});
|
|
}
|
|
}
|
|
|
|
/**
|
|
* initializeDeferredWork:
|
|
* @actor: A #ClutterActor
|
|
* @callback: Function to invoke to perform work
|
|
*
|
|
* This function sets up a callback to be invoked when either the
|
|
* given actor is mapped, or after some period of time when the machine
|
|
* is idle. This is useful if your actor isn't always visible on the
|
|
* screen (for example, all actors in the overview), and you don't want
|
|
* to consume resources updating if the actor isn't actually going to be
|
|
* displaying to the user.
|
|
*
|
|
* Note that queueDeferredWork is called by default immediately on
|
|
* initialization as well, under the assumption that new actors
|
|
* will need it.
|
|
*
|
|
* Returns: A string work identifer
|
|
*/
|
|
function initializeDeferredWork(actor, callback, props) {
|
|
// Turn into a string so we can use as an object property
|
|
let workId = '' + (++_deferredWorkSequence);
|
|
_deferredWorkData[workId] = { 'actor': actor,
|
|
'callback': callback };
|
|
actor.connect('notify::mapped', function () {
|
|
if (!(actor.mapped && _deferredWorkQueue.indexOf(workId) >= 0))
|
|
return;
|
|
_queueBeforeRedraw(workId);
|
|
});
|
|
actor.connect('destroy', function() {
|
|
let index = _deferredWorkQueue.indexOf(workId);
|
|
if (index >= 0)
|
|
_deferredWorkQueue.splice(index, 1);
|
|
delete _deferredWorkData[workId];
|
|
});
|
|
queueDeferredWork(workId);
|
|
return workId;
|
|
}
|
|
|
|
/**
|
|
* queueDeferredWork:
|
|
* @workId: work identifier
|
|
*
|
|
* Ensure that the work identified by @workId will be
|
|
* run on map or timeout. You should call this function
|
|
* for example when data being displayed by the actor has
|
|
* changed.
|
|
*/
|
|
function queueDeferredWork(workId) {
|
|
let data = _deferredWorkData[workId];
|
|
if (!data) {
|
|
let message = 'Invalid work id %d'.format(workId);
|
|
logError(new Error(message), message);
|
|
return;
|
|
}
|
|
if (_deferredWorkQueue.indexOf(workId) < 0)
|
|
_deferredWorkQueue.push(workId);
|
|
if (data.actor.mapped) {
|
|
_queueBeforeRedraw(workId);
|
|
return;
|
|
} else if (_deferredTimeoutId == 0) {
|
|
_deferredTimeoutId = Mainloop.timeout_add_seconds(DEFERRED_TIMEOUT_SECONDS, function () {
|
|
_runAllDeferredWork();
|
|
_deferredTimeoutId = 0;
|
|
return false;
|
|
});
|
|
}
|
|
}
|