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/** -*- 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() {
this._atspiListener = Atspi.EventListener.new(Lang.bind(this, this._onChanged));
this._atspiInited = false;
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);
},
_initAtspi: function() {
if (!this._atspiInited) {
Atspi.init();
Atspi.set_timeout(250, 250);
this._atspiInited = true;
}
},
registerFocusListener: function() {
if (this._focusListenerRegistered)
return;
this._initAtspi();
this._atspiListener.register(STATECHANGED + ':focused');
this._atspiListener.register(STATECHANGED + ':selected');
this._focusListenerRegistered = true;
},
registerCaretListener: function() {
if (this._caretListenerRegistered)
return;
this._initAtspi();
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);
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