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import {
ChangeDetectionStrategy,
Component,
Injector,
computed,
effect,
inject,
signal,
viewChild,
} from '@angular/core'
import { ExampleQueryComponent } from './example-query.component'
import type { ElementRef } from '@angular/core'
import type { DevtoolsPanelRef } from '@tanstack/angular-query-devtools-experimental'
@Component({
selector: 'lazy-load-devtools-panel-example',
changeDetection: ChangeDetectionStrategy.OnPush,
template: `
<example-query />
<h1>Lazy load devtools panel example</h1>
<p>
In this example, the devtools panel is loaded programmatically when the
button is clicked. In addition, the code is lazy loaded.
</p>
<button type="button" (click)="toggleIsOpen()">
{{ isOpen() ? 'Close' : 'Open' }} the devtools panel
</button>
@if (isOpen()) {
<div #div style="height: 500px"></div>
}
`,
imports: [ExampleQueryComponent],
})
export default class LazyLoadDevtoolsPanelExampleComponent {
readonly isOpen = signal(false)
readonly devtools = signal<Promise<DevtoolsPanelRef> | undefined>(undefined)
readonly injector = inject(Injector)
readonly divEl = viewChild<ElementRef>('div')
readonly devToolsOptions = computed(() => ({
hostElement: this.divEl(),
}))
toggleIsOpen() {
this.isOpen.update((prev) => !prev)
}
readonly loadDevtoolsEffect = effect(() => {
if (this.devtools()) return
if (this.isOpen()) {
this.devtools.set(
import('@tanstack/angular-query-devtools-experimental').then(
({ injectDevtoolsPanel }) =>
injectDevtoolsPanel(this.devToolsOptions, {
injector: this.injector,
}),
),
)
}
})
}
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