/** -*- mode: js2; js2-basic-offset: 4; indent-tabs-mode: nil -*- */ /* * Copyright 2012 Inclusive Design Research Centre, OCAD University. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library. If not, see <http://www.gnu.org/licenses/>. * * Author: * Joseph Scheuhammer <clown@alum.mit.edu> * Contributor: * Magdalen Berns <m.berns@sms.ed.ac.uk> */ /* exported FocusCaretTracker */ const Atspi = imports.gi.Atspi; const Signals = imports.misc.signals; const CARETMOVED = 'object:text-caret-moved'; const STATECHANGED = 'object:state-changed'; var FocusCaretTracker = class FocusCaretTracker extends Signals.EventEmitter { constructor() { super(); this._atspiListener = Atspi.EventListener.new(this._onChanged.bind(this)); this._atspiInited = false; this._focusListenerRegistered = false; this._caretListenerRegistered = false; } _onChanged(event) { if (event.type.indexOf(STATECHANGED) == 0) this.emit('focus-changed', event); else if (event.type == CARETMOVED) this.emit('caret-moved', event); } _initAtspi() { if (!this._atspiInited && Atspi.init() == 0) { Atspi.set_timeout(250, 250); this._atspiInited = true; } return this._atspiInited; } registerFocusListener() { if (!this._initAtspi() || this._focusListenerRegistered) return; this._atspiListener.register(`${STATECHANGED}:focused`); this._atspiListener.register(`${STATECHANGED}:selected`); this._focusListenerRegistered = true; } registerCaretListener() { if (!this._initAtspi() || this._caretListenerRegistered) return; this._atspiListener.register(CARETMOVED); this._caretListenerRegistered = true; } deregisterFocusListener() { if (!this._focusListenerRegistered) return; this._atspiListener.deregister(`${STATECHANGED}:focused`); this._atspiListener.deregister(`${STATECHANGED}:selected`); this._focusListenerRegistered = false; } deregisterCaretListener() { if (!this._caretListenerRegistered) return; this._atspiListener.deregister(CARETMOVED); this._caretListenerRegistered = false; } };