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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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12
js/gdm/batch.js
View File

@ -43,12 +43,15 @@
* are not used elsewhere. These APIs may ultimately get dropped entirely and
* replaced by something else.
*/
/* exported ConcurrentBatch, ConsecutiveBatch */
const { GObject } = imports.gi;
const Signals = imports.signals;
const Signals = imports.misc.signals;
var Task = class {
var Task = class extends Signals.EventEmitter {
constructor(scope, handler) {
super();
if (scope)
this.scope = scope;
else
@ -64,7 +67,6 @@ var Task = class {
return null;
}
};
Signals.addSignalMethods(Task.prototype);
var Hold = class extends Task {
constructor() {
@ -101,7 +103,6 @@ var Hold = class extends Task {
return this._acquisitions > 0;
}
};
Signals.addSignalMethods(Hold.prototype);
var Batch = class extends Task {
constructor(scope, tasks) {
@ -171,7 +172,6 @@ var Batch = class extends Task {
this.tasks = this.tasks.splice(0, this._currentTaskIndex + 1);
}
};
Signals.addSignalMethods(Batch.prototype);
var ConcurrentBatch = class extends Batch {
process() {
@ -186,7 +186,6 @@ var ConcurrentBatch = class extends Batch {
this.nextTask();
}
};
Signals.addSignalMethods(ConcurrentBatch.prototype);
var ConsecutiveBatch = class extends Batch {
process() {
@ -205,4 +204,3 @@ var ConsecutiveBatch = class extends Batch {
}
}
};
Signals.addSignalMethods(ConsecutiveBatch.prototype);