3c8325f1f3
This commit updates the code to use mutter's new background api, and changes the shell's startup animation to be closer to the mockups. Based on initial work by Giovanni Campagna https://bugzilla.gnome.org/show_bug.cgi?id=682429
783 lines
26 KiB
JavaScript
783 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 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 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 UnlockDialog = imports.ui.unlockDialog;
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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 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.NORMAL;
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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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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.isGreeter)
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screenShield.showDialog();
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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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// start session after we know what mode we're running in
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let signalId = sessionMode.connect('updated', function() {
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sessionMode.disconnect(signalId);
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startSession();
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});
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}
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function startSession() {
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sessionMode.connect('updated', _loadDefaultStylesheet);
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shellDBusService = new ShellDBus.GnomeShell();
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shellMountOpDBusService = new ShellMountOperation.GnomeShellMountOpHandler();
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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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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 (UnlockDialog.isSupported())
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screenShield = new ScreenShield.ScreenShield();
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else
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screenShield = new ScreenShield.ScreenShieldFallback();
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// The message tray relies on being constructed
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// after the panel.
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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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sessionMode.connect('updated', _sessionUpdated);
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_sessionUpdated();
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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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_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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// Run the startup animation as soon as the mainloop is idle enough.
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// This is necessary to have it smooth and without interruptions from
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// completed IO tasks
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GLib.idle_add(GLib.PRIORITY_LOW, function() {
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layoutManager.startupAnimation();
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return false;
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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');
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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;
|
|
});
|
|
}
|
|
}
|