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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /browser/components/syncedtabs/EventEmitter.sys.mjs | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'browser/components/syncedtabs/EventEmitter.sys.mjs')
-rw-r--r-- | browser/components/syncedtabs/EventEmitter.sys.mjs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/browser/components/syncedtabs/EventEmitter.sys.mjs b/browser/components/syncedtabs/EventEmitter.sys.mjs new file mode 100644 index 0000000000..ed026dc173 --- /dev/null +++ b/browser/components/syncedtabs/EventEmitter.sys.mjs @@ -0,0 +1,36 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +// Simple event emitter abstraction for storage objects to use. +export function EventEmitter() { + this._events = new Map(); +} + +EventEmitter.prototype = { + on(event, listener) { + if (this._events.has(event)) { + this._events.get(event).add(listener); + } else { + this._events.set(event, new Set([listener])); + } + }, + off(event, listener) { + if (!this._events.has(event)) { + return; + } + this._events.get(event).delete(listener); + }, + emit(event, ...args) { + if (!this._events.has(event)) { + return; + } + for (let listener of this._events.get(event).values()) { + try { + listener.apply(this, args); + } catch (e) { + console.error(e); + } + } + }, +}; |