If you are curious how components' state is handled, they employed the React class components method:
// Import the StatefulComponent
import { StatefulComponent } from 'valdi_core/src/Component';
// ViewModel + State interfaces for component
export interface TimerViewModel { loop: number }
interface TimerState { elapsed: number }
// Component class
export class Timer extends StatefulComponent<TimerViewModel, TimerState> {
// Initialize the state
state = { elapsed: 0 };
// When creating the component, start a periodic logic
private interval?: number;
// Initialize the setInterval that will update state once a second incrementing
// the `elapsed` state value.
onCreate() {
this.interval = setInterval(() => {
// Increment the state to trigger a re-render periodically
const elapsed = this.state.elapsed;
const loop = this.viewModel.loop;
this.setState({ elapsed: (elapsed + 1) % loop });
}, 1000);
}
// When component is removed, make sure to cleanup interval logic
onDestroy() {
if (this.interval) clearInterval(this.interval);
}
// Render visuals will depend both on the state and the view model
onRender() {
<view padding={30} backgroundColor='lightblue'>
<label value={`Time Elapsed: ${this.state.elapsed} seconds`} />;
<label value={`Time Looping every: ${this.viewModel.loop} seconds`} />;
</view>;
}
}
