trilium/src/public/javascripts/services/spaced_update.js
2020-02-08 21:23:42 +01:00

50 lines
1.2 KiB
JavaScript

export default class SpacedUpdate {
constructor(updater, updateInterval = 1000) {
this.updater = updater;
this.lastUpdated = Date.now();
this.changed = false;
this.updateInterval = updateInterval;
}
scheduleUpdate() {
if (!this.changeForbidden) {
this.changed = true;
setTimeout(() => this.triggerUpdate());
}
}
async updateNowIfNecessary() {
if (this.changed) {
this.changed = false;
await this.updater();
}
}
triggerUpdate() {
if (!this.changed) {
return;
}
if (Date.now() - this.lastUpdated > this.updateInterval) {
this.updater();
this.lastUpdated = Date.now();
this.changed = false;
}
else {
// update not triggered but changes are still pending so we need to schedule another check
this.scheduleUpdate();
}
}
async allowUpdateWithoutChange(callback) {
this.changeForbidden = true;
try {
await callback();
}
finally {
this.changeForbidden = false;
}
}
}