79 lines
2.9 KiB
JavaScript
79 lines
2.9 KiB
JavaScript
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// ========================================
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// 模块：列表子弹线功能
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// ========================================
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let bulletThreadingActive = false;
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let selectionChangeHandler = null;
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let btRafId = null;
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let btLastItems = [];
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// 初始化列表子弹线功能
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export const initBulletThreading = () => {
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if (bulletThreadingActive) return;
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bulletThreadingActive = true;
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const apply = () => {
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btRafId = null;
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const sel = window.getSelection();
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if (!sel.rangeCount) {
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// 清理上一次标记
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btLastItems.forEach(node => {
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node.classList.remove('en_item_bullet_actived', 'en_item_bullet_line');
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node.style.removeProperty('--en-bullet-line-height');
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});
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btLastItems = [];
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return;
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}
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const start = sel.getRangeAt(0).startContainer;
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// 清理上一次标记（避免全局查询）
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btLastItems.forEach(node => {
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node.classList.remove('en_item_bullet_actived', 'en_item_bullet_line');
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node.style.removeProperty('--en-bullet-line-height');
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});
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btLastItems = [];
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const items = [];
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for (let n = start; n && n !== document.body; n = n.parentElement) {
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if (n.getAttribute?.('custom-f')) return; // 父级存在 custom-f 时直接终止
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if (n.dataset?.type === 'NodeListItem') items.push(n);
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}
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if (items.length === 0) return;
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for (let i = 0; i < items.length - 1; i++) {
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const h = items[i].getBoundingClientRect().top - items[i + 1].getBoundingClientRect().top;
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items[i].style.setProperty('--en-bullet-line-height', `${h}px`);
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items[i].classList.add('en_item_bullet_line');
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}
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items.forEach(item => item.classList.add('en_item_bullet_actived'));
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btLastItems = items.slice();
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};
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selectionChangeHandler = () => { if (!btRafId) btRafId = requestAnimationFrame(apply); };
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document.addEventListener('selectionchange', selectionChangeHandler);
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};
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// 移除列表子弹线功能
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export const removeBulletThreading = () => {
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if (!bulletThreadingActive) return;
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bulletThreadingActive = false;
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if (btRafId) { cancelAnimationFrame(btRafId); btRafId = null; }
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if (selectionChangeHandler) {
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document.removeEventListener('selectionchange', selectionChangeHandler);
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selectionChangeHandler = null;
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}
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// 清理剩余标记
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btLastItems.forEach(node => {
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node.classList.remove('en_item_bullet_actived', 'en_item_bullet_line');
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node.style.removeProperty('--en-bullet-line-height');
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});
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btLastItems = [];
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};
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// 初始化列表子弹线模块
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export const initBulletThreadingModule = () => {
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window.initBulletThreading = initBulletThreading;
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window.removeBulletThreading = removeBulletThreading;
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window.cleanupBulletThreading = removeBulletThreading;
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};
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