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Tracking Mount Probe
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import Controller from '@ember/controller'; | |
import { tracked } from '@glimmer/tracking'; | |
import { action, notifyPropertyChange } from '@ember/object'; | |
import { next } from '@ember/runloop'; | |
class ProbeCell { | |
constructor(name, pushLogEntry) { | |
this.name = name; | |
this.pushLogEntry = pushLogEntry; | |
} | |
get value() { | |
const data = Date.now(); | |
this.pushLogEntry(`${this.name}: ${data}`); | |
return data; | |
} | |
} | |
export default class ApplicationController extends Controller { | |
@tracked foo = new ProbeCell('foo', this.pushLogEntry); | |
@tracked bar = new ProbeCell('bar', this.pushLogEntry); | |
@tracked isTrackingBarCell = false; | |
@tracked isFooCellActive; | |
@tracked isBarCellActive; | |
@tracked log = []; | |
latestUpdate = 0; | |
@action | |
pushLogEntry(entry) { | |
this.latestUpdate++; | |
// This avoid self-invalidation aka back-tracking re-render. | |
next(() => this.log = [...this.log, entry]); | |
} | |
@action | |
updateCell(cell) { | |
notifyPropertyChange(cell, 'value'); | |
} | |
@action | |
toggleBarCellTracking() { | |
this.isTrackingBarCell = !this.isTrackingBarCell; | |
} | |
isCellActive(cell) { | |
const { latestUpdate } = this; | |
notifyPropertyChange(cell, 'value'); | |
let resolve; | |
const deferred = new Promise(_ => resolve = _); | |
next(() => { | |
resolve(this.latestUpdate !== latestUpdate); | |
}); | |
return deferred; | |
} | |
@action | |
async updateCellStates() { | |
this.isFooCellActive = await this.isCellActive(this.foo); | |
this.isBarCellActive = await this.isCellActive(this.bar); | |
} | |
} |
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{ | |
"version": "0.17.1", | |
"EmberENV": { | |
"FEATURES": {}, | |
"_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false, | |
"_APPLICATION_TEMPLATE_WRAPPER": true, | |
"_JQUERY_INTEGRATION": true | |
}, | |
"options": { | |
"use_pods": false, | |
"enable-testing": false | |
}, | |
"dependencies": { | |
"jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js", | |
"ember": "3.18.1", | |
"ember-template-compiler": "3.18.1", | |
"ember-testing": "3.18.1" | |
}, | |
"addons": { | |
"@glimmer/component": "1.0.0" | |
} | |
} |
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