50 lines
858 B
TypeScript
50 lines
858 B
TypeScript
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import { computed, onScopeDispose, ref } from 'vue';
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import { useRafFn } from '@vueuse/core';
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/**
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* count down
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*
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* @param seconds - count down seconds
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*/
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export default function useCountDown(seconds: number) {
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const FPS_PER_SECOND = 60;
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const fps = ref(0);
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const count = computed(() => Math.ceil(fps.value / FPS_PER_SECOND));
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const isCounting = computed(() => fps.value > 0);
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const { pause, resume } = useRafFn(
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() => {
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if (fps.value > 0) {
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fps.value -= 1;
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} else {
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pause();
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}
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},
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{ immediate: false }
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);
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function start(updateSeconds: number = seconds) {
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fps.value = FPS_PER_SECOND * updateSeconds;
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resume();
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}
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function stop() {
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fps.value = 0;
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pause();
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}
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onScopeDispose(() => {
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pause();
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});
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return {
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count,
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isCounting,
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start,
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stop
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};
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}
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