/** -*- 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> */ const Atspi = imports.gi.Atspi; const Lang = imports.lang; const Signals = imports.signals; const CARETMOVED = 'object:text-caret-moved'; const STATECHANGED = 'object:state-changed'; const FocusCaretTracker = new Lang.Class({ Name: 'FocusCaretTracker', _init: function() { Atspi.init(); Atspi.set_timeout(250, 250); this._atspiListener = Atspi.EventListener.new(Lang.bind(this, this._onChanged)); this._focusListenerRegistered = false; this._caretListenerRegistered = false; }, _onChanged: function(event) { if (event.type.indexOf(STATECHANGED) == 0) this.emit('focus-changed', event); else if (event.type == CARETMOVED) this.emit('caret-moved', event); }, registerFocusListener: function() { if (this._focusListenerRegistered) return; // Ignore the return value, we get an exception if they fail // And they should never fail this._atspiListener.register(STATECHANGED + ':focused'); this._atspiListener.register(STATECHANGED + ':selected'); this._focusListenerRegistered = true; }, registerCaretListener: function() { if (this._caretListenerRegistered) return; this._atspiListener.register(CARETMOVED); this._caretListenerRegistered = true; }, deregisterFocusListener: function() { if (!this._focusListenerRegistered) return; this._atspiListener.deregister(STATECHANGED + ':focused'); this._atspiListener.deregister(STATECHANGED + ':selected'); this._focusListenerRegistered = false; }, deregisterCaretListener: function() { if (!this._caretListenerRegistered) return; this._atspiListener.deregister(CARETMOVED); this._caretListenerRegistered = false; } }); Signals.addSignalMethods(FocusCaretTracker.prototype);