a88e59c1a8
Introduce a new class, EventEmitter, which implements signal handling for pure JavaScript classes. EventEmitter still utilizes GJS' addSignalMethods internally. EventEmitter allows static typechecking to understand the structure of event-emitting JS classes and makes creating child classes simpler. The name 'EventEmitter' mirrors a common name for this pattern in Node and in JS libraries. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2043>
92 lines
2.8 KiB
JavaScript
92 lines
2.8 KiB
JavaScript
/** -*- mode: js2; js2-basic-offset: 4; indent-tabs-mode: nil -*- */
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/*
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* Copyright 2012 Inclusive Design Research Centre, OCAD University.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Author:
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* Joseph Scheuhammer <clown@alum.mit.edu>
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* Contributor:
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* Magdalen Berns <m.berns@sms.ed.ac.uk>
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*/
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/* exported FocusCaretTracker */
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const Atspi = imports.gi.Atspi;
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const Signals = imports.misc.signals;
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const CARETMOVED = 'object:text-caret-moved';
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const STATECHANGED = 'object:state-changed';
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var FocusCaretTracker = class FocusCaretTracker extends Signals.EventEmitter {
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constructor() {
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super();
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this._atspiListener = Atspi.EventListener.new(this._onChanged.bind(this));
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this._atspiInited = false;
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this._focusListenerRegistered = false;
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this._caretListenerRegistered = false;
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}
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_onChanged(event) {
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if (event.type.indexOf(STATECHANGED) == 0)
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this.emit('focus-changed', event);
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else if (event.type == CARETMOVED)
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this.emit('caret-moved', event);
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}
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_initAtspi() {
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if (!this._atspiInited && Atspi.init() == 0) {
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Atspi.set_timeout(250, 250);
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this._atspiInited = true;
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}
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return this._atspiInited;
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}
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registerFocusListener() {
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if (!this._initAtspi() || this._focusListenerRegistered)
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return;
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this._atspiListener.register(`${STATECHANGED}:focused`);
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this._atspiListener.register(`${STATECHANGED}:selected`);
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this._focusListenerRegistered = true;
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}
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registerCaretListener() {
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if (!this._initAtspi() || this._caretListenerRegistered)
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return;
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this._atspiListener.register(CARETMOVED);
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this._caretListenerRegistered = true;
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}
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deregisterFocusListener() {
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if (!this._focusListenerRegistered)
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return;
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this._atspiListener.deregister(`${STATECHANGED}:focused`);
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this._atspiListener.deregister(`${STATECHANGED}:selected`);
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this._focusListenerRegistered = false;
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}
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deregisterCaretListener() {
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if (!this._caretListenerRegistered)
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return;
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this._atspiListener.deregister(CARETMOVED);
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this._caretListenerRegistered = false;
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}
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};
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