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Adopt EventEmitter class instead of injecting Signal methods

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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>
This commit is contained in:
Evan Welsh 2022-07-04 18:30:44 -04:00
parent 9e30afe678
commit a88e59c1a8
39 changed files with 204 additions and 169 deletions
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7
tests/unit/signalTracker.js
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@ -5,7 +5,7 @@
const { GObject } = imports.gi;
const JsUnit = imports.jsUnit;
const Signals = imports.signals;
const Signals = imports.misc.signals;
const Environment = imports.ui.environment;
const { TransientSignalHolder, registerDestroyableType } = imports.misc.signalTracker;
@ -17,14 +17,11 @@ const Destroyable = GObject.registerClass({
}, class Destroyable extends GObject.Object {});
registerDestroyableType(Destroyable);
class PlainEmitter {}
Signals.addSignalMethods(PlainEmitter.prototype);
const GObjectEmitter = GObject.registerClass({
Signals: { 'signal': {} },
}, class GObjectEmitter extends Destroyable {});
const emitter1 = new PlainEmitter();
const emitter1 = new Signals.EventEmitter();
const emitter2 = new GObjectEmitter();
const tracked1 = new Destroyable();