index.vue
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<template>
<span>
{{ displayValue }}
</span>
</template>
<script lang="ts">
import { defineComponent, reactive, computed, watch, onMounted, unref, toRef } from 'vue';
import { countToProps } from './props';
import { isNumber } from '/@/utils/is';
export default defineComponent({
name: 'CountTo',
props: countToProps,
emits: ['mounted', 'callback'],
setup(props, { emit }) {
const state = reactive<{
localStartVal: number;
printVal: number | null;
displayValue: string;
paused: boolean;
localDuration: number | null;
startTime: number | null;
timestamp: number | null;
rAF: any;
remaining: number | null;
}>({
localStartVal: props.startVal,
displayValue: formatNumber(props.startVal),
printVal: null,
paused: false,
localDuration: props.duration,
startTime: null,
timestamp: null,
remaining: null,
rAF: null,
});
onMounted(() => {
if (props.autoplay) {
start();
}
emit('mounted');
});
const getCountDown = computed(() => {
return props.startVal > props.endVal;
});
watch([() => props.startVal, () => props.endVal], () => {
if (props.autoplay) {
start();
}
});
function start() {
const { startVal, duration } = props;
state.localStartVal = startVal;
state.startTime = null;
state.localDuration = duration;
state.paused = false;
state.rAF = requestAnimationFrame(count);
}
function pauseResume() {
if (state.paused) {
resume();
state.paused = false;
} else {
pause();
state.paused = true;
}
}
function pause() {
cancelAnimationFrame(state.rAF);
}
function resume() {
state.startTime = null;
state.localDuration = +(state.remaining as number);
state.localStartVal = +(state.printVal as number);
requestAnimationFrame(count);
}
function reset() {
state.startTime = null;
cancelAnimationFrame(state.rAF);
state.displayValue = formatNumber(props.startVal);
}
function count(timestamp: number) {
const { useEasing, easingFn, endVal } = props;
if (!state.startTime) state.startTime = timestamp;
state.timestamp = timestamp;
const progress = timestamp - state.startTime;
state.remaining = (state.localDuration as number) - progress;
if (useEasing) {
if (unref(getCountDown)) {
state.printVal =
state.localStartVal -
easingFn(progress, 0, state.localStartVal - endVal, state.localDuration as number);
} else {
state.printVal = easingFn(
progress,
state.localStartVal,
endVal - state.localStartVal,
state.localDuration as number
);
}
} else {
if (unref(getCountDown)) {
state.printVal =
state.localStartVal -
(state.localStartVal - endVal) * (progress / (state.localDuration as number));
} else {
state.printVal =
state.localStartVal +
(endVal - state.localStartVal) * (progress / (state.localDuration as number));
}
}
if (unref(getCountDown)) {
state.printVal = state.printVal < endVal ? endVal : state.printVal;
} else {
state.printVal = state.printVal > endVal ? endVal : state.printVal;
}
state.displayValue = formatNumber(state.printVal);
if (progress < (state.localDuration as number)) {
state.rAF = requestAnimationFrame(count);
} else {
emit('callback');
}
}
function formatNumber(num: number | string) {
const { decimals, decimal, separator, suffix, prefix } = props;
num = Number(num).toFixed(decimals);
num += '';
const x = num.split('.');
let x1 = x[0];
const x2 = x.length > 1 ? decimal + x[1] : '';
const rgx = /(\d+)(\d{3})/;
if (separator && !isNumber(separator)) {
while (rgx.test(x1)) {
x1 = x1.replace(rgx, '$1' + separator + '$2');
}
}
return prefix + x1 + x2 + suffix;
}
return {
count,
reset,
resume,
start,
pauseResume,
displayValue: toRef(state, 'displayValue'),
};
},
});
</script>