<template>
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<div class="auto-scroll" @mouseenter="pause" @mouseleave="resume">
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<div v-if="$slots.head" class="auto-scroll__head">
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<slot name="head" />
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</div>
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<div ref="viewportRef" class="auto-scroll__viewport">
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<div ref="contentRef" class="auto-scroll__content">
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<slot />
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</div>
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</div>
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</div>
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</template>
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<script lang="ts" setup>
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defineOptions({
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name: 'report-screen-auto-scroll'
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});
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import { nextTick, onMounted, onUnmounted, ref, watch } from 'vue';
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const props = withDefaults(
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defineProps<{
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/** 滚动步进像素 */
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step?: number;
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/** 滚动间隔 ms */
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interval?: number;
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/** 依赖变化时重新检测是否需要滚动（如列表数据） */
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watchKey?: string | number;
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}>(),
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{
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step: 1,
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interval: 40
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}
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);
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const viewportRef = ref<HTMLElement | null>(null);
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const contentRef = ref<HTMLElement | null>(null);
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const paused = ref(false);
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const direction = ref(1);
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let timer: ReturnType<typeof setInterval> | null = null;
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let resizeObserver: ResizeObserver | null = null;
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function canScroll() {
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const el = viewportRef.value;
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if (!el) return false;
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return el.scrollHeight > el.clientHeight + 2;
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}
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function tick() {
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const el = viewportRef.value;
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if (!el || paused.value || !canScroll()) return;
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const max = el.scrollHeight - el.clientHeight;
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let next = el.scrollTop + props.step * direction.value;
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if (next >= max) {
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next = max;
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direction.value = -1;
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} else if (next <= 0) {
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next = 0;
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direction.value = 1;
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}
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el.scrollTop = next;
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}
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function start() {
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stop();
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timer = setInterval(tick, props.interval);
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}
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function stop() {
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if (timer) {
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clearInterval(timer);
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timer = null;
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}
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}
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function pause() {
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paused.value = true;
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}
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function resume() {
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paused.value = false;
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}
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async function reset() {
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await nextTick();
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const el = viewportRef.value;
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if (el) el.scrollTop = 0;
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direction.value = 1;
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}
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onMounted(() => {
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start();
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const el = viewportRef.value;
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if (el && typeof ResizeObserver !== 'undefined') {
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resizeObserver = new ResizeObserver(() => {
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reset();
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});
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resizeObserver.observe(el);
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if (contentRef.value) resizeObserver.observe(contentRef.value);
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}
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window.addEventListener('resize', reset);
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window.addEventListener('report-screen-fullscreen-change', reset);
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});
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onUnmounted(() => {
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stop();
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resizeObserver?.disconnect();
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window.removeEventListener('resize', reset);
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window.removeEventListener('report-screen-fullscreen-change', reset);
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});
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watch(
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() => props.watchKey,
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() => reset()
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);
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</script>
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<style lang="scss" scoped>
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.auto-scroll {
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display: flex;
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flex-direction: column;
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height: 100%;
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min-height: 0;
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&__head {
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flex-shrink: 0;
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}
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&__viewport {
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flex: 1;
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min-height: 0;
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overflow: hidden;
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}
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&__content {
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min-height: min-content;
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}
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}
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</style>
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