1053 lines
35 KiB
JavaScript
1053 lines
35 KiB
JavaScript
// MarkLite Renderer Process
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(function () {
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'use strict';
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// ===== DOM Elements =====
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const editor = document.getElementById('editor');
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const preview = document.getElementById('preview');
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const lineNumbers = document.getElementById('line-numbers');
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const welcomeScreen = document.getElementById('welcome-screen');
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const dropOverlay = document.getElementById('drop-overlay');
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const modifiedBanner = document.getElementById('modified-banner');
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const statusText = document.getElementById('status-text');
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const statusCursor = document.getElementById('status-cursor');
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const statusSize = document.getElementById('status-size');
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const statusSizeDivider = document.querySelector('.status-size-divider');
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const resizer = document.getElementById('resizer');
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const editorPanel = document.getElementById('editor-panel');
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const previewPanel = document.getElementById('preview-panel');
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const mainContent = document.getElementById('main-content');
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const tabList = document.getElementById('tab-list');
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// Buttons
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const btnOpen = document.getElementById('btn-open');
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const btnSave = document.getElementById('btn-save');
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const btnSplit = document.getElementById('btn-split');
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const btnEditor = document.getElementById('btn-editor');
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const btnPreview = document.getElementById('btn-preview');
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const btnWelcomeOpen = document.getElementById('btn-welcome-open');
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const btnWelcomeNew = document.getElementById('btn-welcome-new');
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const btnDark = document.getElementById('btn-dark');
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const btnReload = document.getElementById('btn-reload');
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const btnDismiss = document.getElementById('btn-dismiss');
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const btnNewTab = document.getElementById('btn-new-tab');
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// ===== Tab State =====
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let tabs = []; // Array of tab objects
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let activeTabId = null;
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let tabIdCounter = 0;
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// ===== Other State =====
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let viewMode = 'split';
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let updateTimer = null;
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let lineCountCache = 0;
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// ===== Tab Object =====
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function createTab(filePath, content) {
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const id = ++tabIdCounter;
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return {
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id,
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filePath: filePath || null,
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content: content || '',
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isModified: false,
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scrollTop: 0,
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scrollLeft: 0,
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selectionStart: 0,
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selectionEnd: 0,
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previewScrollTop: 0
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};
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}
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// ===== localStorage Helpers =====
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function loadSettings() {
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try {
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return JSON.parse(localStorage.getItem('marklite-settings') || '{}');
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} catch { return {}; }
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}
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function saveSetting(key, value) {
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try {
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const s = loadSettings();
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s[key] = value;
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localStorage.setItem('marklite-settings', JSON.stringify(s));
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} catch { /* ignore */ }
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}
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// ===== Dark Mode =====
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function initDarkMode() {
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const settings = loadSettings();
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const iconDark = document.getElementById('icon-dark');
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const iconLight = document.getElementById('icon-light');
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function apply(isDark) {
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document.documentElement.classList.toggle('dark', isDark);
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iconDark.style.display = isDark ? 'none' : '';
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iconLight.style.display = isDark ? '' : 'none';
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}
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// Respect system preference if no saved setting
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const prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
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apply(settings.darkMode !== undefined ? !!settings.darkMode : prefersDark);
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btnDark.addEventListener('click', () => {
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const isDark = !document.documentElement.classList.contains('dark');
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apply(isDark);
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saveSetting('darkMode', isDark);
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});
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}
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// ===== Initialize marked.js =====
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function initMarked() {
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if (typeof marked !== 'undefined') {
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const renderer = new marked.Renderer();
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// 兼容 marked v4（positional args）和 v9+（token object）
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renderer.code = function (codeOrToken, legacyLang) {
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const text = (typeof codeOrToken === 'object' && codeOrToken !== null)
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? codeOrToken.text
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: codeOrToken;
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const lang = (typeof codeOrToken === 'object' && codeOrToken !== null)
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? codeOrToken.lang
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: legacyLang;
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let highlighted = text;
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if (typeof hljs !== 'undefined') {
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if (lang && hljs.getLanguage(lang)) {
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try { highlighted = hljs.highlight(text, { language: lang }).value; } catch (e) { /* fallback */ }
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} else {
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try { highlighted = hljs.highlightAuto(text).value; } catch (e) { /* fallback */ }
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}
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}
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const langClass = lang ? ` language-${lang}` : '';
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return `<pre><code class="hljs${langClass}">${highlighted}</code></pre>`;
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};
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marked.setOptions({ gfm: true, breaks: true, pedantic: false });
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marked.use({ renderer });
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}
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}
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// ===== HTML Sanitizer =====
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// 移除事件处理器、危险元素和 javascript: 协议，防止 XSS
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const DANGEROUS_TAGS = new Set([
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'script', 'iframe', 'object', 'embed', 'applet', 'form',
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'base', 'meta', 'link', 'style'
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]);
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const DANGEROUS_ATTRS = new Set([
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'onabort', 'onanimationend', 'onanimationiteration', 'onanimationstart',
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'onauxclick', 'onbeforecopy', 'onbeforecut', 'onbeforepaste', 'onblur',
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'oncancel', 'oncanplay', 'oncanplaythrough', 'onchange', 'onclick',
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'onclose', 'oncontextmenu', 'oncopy', 'oncuechange', 'oncut',
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'ondblclick', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave',
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'ondragover', 'ondragstart', 'ondrop', 'ondurationchange', 'onemptied',
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'onended', 'onerror', 'onfocus', 'onfocusin', 'onfocusout',
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'onfullscreenchange', 'onfullscreenerror', 'ongotpointercapture',
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'oninput', 'oninvalid', 'onkeydown', 'onkeypress', 'onkeyup',
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'onload', 'onloadeddata', 'onloadedmetadata', 'onloadstart',
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'onlostpointercapture', 'onmousedown', 'onmouseenter', 'onmouseleave',
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'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel',
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'onpaste', 'onpause', 'onplay', 'onplaying', 'onpointercancel',
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'onpointerdown', 'onpointerenter', 'onpointerleave', 'onpointermove',
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'onpointerout', 'onpointerover', 'onpointerup', 'onprogress',
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'onratechange', 'onreset', 'onresize', 'onscroll', 'onsearch',
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'onseeked', 'onseeking', 'onselect', 'onselectionchange',
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'onselectstart', 'onshow', 'onstalled', 'onsubmit', 'onsuspend',
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'ontimeupdate', 'ontoggle', 'ontouchcancel', 'ontouchend',
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'ontouchmove', 'ontouchstart', 'ontransitionend', 'onvolumechange',
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'onwaiting', 'onwheel', 'onanimationend', 'oncontentvisibilityautostatechange',
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'onscrollend', 'onscrollsnapchange', 'onscrollsnapchanging'
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]);
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function sanitizeHTML(html) {
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// 用 DOMParser 解析（不会执行脚本）
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const doc = new DOMParser().parseFromString(html, 'text/html');
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const walker = document.createTreeWalker(doc.body, NodeFilter.SHOW_ELEMENT);
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const toRemove = [];
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while (walker.nextNode()) {
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const el = walker.currentNode;
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const tag = el.tagName.toLowerCase();
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// 移除危险元素
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if (DANGEROUS_TAGS.has(tag)) {
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toRemove.push(el);
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continue;
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}
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// 移除危险属性（on* 事件处理器 + javascript: 协议）
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for (const attr of Array.from(el.attributes)) {
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const name = attr.name.toLowerCase();
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if (DANGEROUS_ATTRS.has(name) || name.startsWith('on')) {
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el.removeAttribute(attr.name);
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} else if (
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(name === 'href' || name === 'action' || name === 'formaction' || name === 'xlink:href') &&
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/^\s*javascript:/i.test(attr.value)
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) {
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el.removeAttribute(attr.name);
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} else if (name === 'style' && /expression\s*\(|url\s*\(\s*['"]?\s*javascript:/i.test(attr.value)) {
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el.removeAttribute(attr.name);
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}
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}
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}
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// 批量移除危险元素
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for (const el of toRemove) {
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el.parentNode.removeChild(el);
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}
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return doc.body.innerHTML;
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}
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// ===== Markdown Rendering =====
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function renderMarkdown(text) {
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if (typeof marked === 'undefined') {
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preview.textContent = '错误: Markdown 解析库未加载';
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preview.style.color = 'red';
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return;
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}
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try {
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const raw = marked.parse(text);
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preview.innerHTML = sanitizeHTML(raw);
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preview.style.color = '';
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} catch (e) {
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preview.textContent = '渲染错误: ' + e.message;
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preview.style.color = 'red';
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}
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}
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// Intercept link clicks in preview — open in system browser
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function initPreviewLinks() {
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preview.addEventListener('click', (e) => {
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const link = e.target.closest('a');
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if (!link) return;
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e.preventDefault();
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const href = link.getAttribute('href');
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if (!href) return;
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// Anchor links: scroll within preview
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if (href.startsWith('#')) {
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const target = preview.querySelector(href);
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if (target) target.scrollIntoView({ behavior: 'smooth' });
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return;
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}
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// Only allow http/https protocols
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try {
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const url = new URL(href);
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if (url.protocol !== 'http:' && url.protocol !== 'https:') return;
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} catch {
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// Relative URLs fail new URL(), but we already handled anchors above
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return;
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}
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// External links: open in system browser
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if (typeof window.electronAPI !== 'undefined' && window.electronAPI.openExternal) {
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window.electronAPI.openExternal(href);
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} else {
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window.open(href, '_blank', 'noopener');
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}
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});
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}
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// ===== Line Numbers =====
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// 快速计算换行符数量，避免 split 产生大数组
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function countNewlines(text) {
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let count = 1;
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for (let i = 0, len = text.length; i < len; i++) {
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if (text.charCodeAt(i) === 10) count++; // '\n' = 0x0A
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}
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return count;
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}
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function updateLineNumbers() {
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const count = countNewlines(editor.value);
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if (count === lineCountCache) return;
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lineCountCache = count;
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// 大文件（>2000 行）时用虚拟化：只渲染可视区域的行号
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const LARGE_FILE_THRESHOLD = 2000;
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if (count > LARGE_FILE_THRESHOLD) {
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renderVirtualLineNumbers(count);
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} else {
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// 小文件：一次性生成全部行号（使用数组 join 比字符串拼接快）
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const arr = new Array(count);
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for (let i = 0; i < count; i++) {
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arr[i] = '<div class="line-num">' + (i + 1) + '</div>';
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}
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lineNumbers.innerHTML = arr.join('');
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}
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}
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// 虚拟化行号：只渲染当前可视区域附近的行号
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function renderVirtualLineNumbers(totalLines) {
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const lineHeight = 20.8; // 与 CSS line-height 一致
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const scrollTop = editor.scrollTop;
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const viewportHeight = editor.clientHeight;
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const buffer = 20; // 上下缓冲行数
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const startLine = Math.max(0, Math.floor(scrollTop / lineHeight) - buffer);
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const endLine = Math.min(totalLines, Math.ceil((scrollTop + viewportHeight) / lineHeight) + buffer);
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const visibleCount = endLine - startLine;
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// 顶部占位
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const topPadding = startLine * lineHeight;
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// 底部占位
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const bottomPadding = (totalLines - endLine) * lineHeight;
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const arr = new Array(visibleCount + 2);
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arr[0] = '<div style="height:' + topPadding + 'px"></div>';
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for (let i = 0; i < visibleCount; i++) {
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arr[i + 1] = '<div class="line-num">' + (startLine + i + 1) + '</div>';
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}
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arr[visibleCount + 1] = '<div style="height:' + bottomPadding + 'px"></div>';
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lineNumbers.innerHTML = arr.join('');
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}
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// ===== Cursor Position =====
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function updateCursorPosition() {
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const text = editor.value;
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const pos = editor.selectionStart;
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const textBefore = text.substring(0, pos);
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const lines = textBefore.split('\n');
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statusCursor.textContent = `行 ${lines.length}, 列 ${lines[lines.length - 1].length + 1}`;
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}
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// ===== File Size =====
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function formatBytes(bytes) {
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if (bytes < 1024) return bytes + ' B';
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if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB';
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return (bytes / (1024 * 1024)).toFixed(1) + ' MB';
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}
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function updateFileSize() {
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const bytes = new Blob([editor.value]).size;
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statusSize.textContent = formatBytes(bytes);
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statusSizeDivider.classList.add('visible');
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}
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// ===== Scroll Sync =====
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let previewPositions = null;
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let lineToPreviewMap = null; // 行号 → 预览像素位置的映射
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function cachePreviewPositions() {
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previewPositions = [];
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for (let i = 0; i < preview.children.length; i++) {
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previewPositions.push(preview.children[i].offsetTop);
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}
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// 构建行号→预览位置的映射表
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buildLineToPreviewMap();
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}
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// 通过分析原始 Markdown 文本，建立编辑器行号到预览 DOM 位置的映射
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function buildLineToPreviewMap() {
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if (!previewPositions || previewPositions.length === 0) {
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lineToPreviewMap = null;
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return;
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}
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const text = editor.value;
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const lines = text.split('\n');
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const totalLines = lines.length;
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// 找出每个"块级元素"在编辑器中的起始行
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// 块级元素：标题、段落、代码块、列表、引用、表格、水平线
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const blockStartLines = [];
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let inCodeBlock = false;
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for (let i = 0; i < totalLines; i++) {
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const line = lines[i];
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const trimmed = line.trimStart();
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// 围栏代码块边界
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if (trimmed.startsWith('```')) {
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if (!inCodeBlock) {
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blockStartLines.push(i);
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inCodeBlock = true;
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} else {
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inCodeBlock = false;
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}
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continue;
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}
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if (inCodeBlock) continue;
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// 块级元素起始行
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if (
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trimmed.startsWith('#') || // 标题
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trimmed.startsWith('- ') || // 无序列表
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trimmed.startsWith('* ') || // 无序列表
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trimmed.startsWith('+ ') || // 无序列表
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/^\d+\.\s/.test(trimmed) || // 有序列表
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trimmed.startsWith('> ') || // 引用
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trimmed.startsWith('|') || // 表格
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trimmed.startsWith('---') || // 水平线
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trimmed.startsWith('***') || // 水平线
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trimmed.startsWith('___') || // 水平线
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(trimmed === '' && i > 0 && lines[i - 1].trim() === '') // 连续空行=段落分隔
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) {
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blockStartLines.push(i);
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}
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}
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// 去重并排序
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const uniqueStarts = [...new Set(blockStartLines)].sort((a, b) => a - b);
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// 将编辑器行号映射到预览 DOM 位置
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// 每个块的起始行对应一个预览元素，用线性插值填充中间行
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lineToPreviewMap = new Float32Array(totalLines);
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if (uniqueStarts.length === 0) {
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// 没有找到块边界，回退到线性映射
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for (let i = 0; i < totalLines; i++) {
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lineToPreviewMap[i] = (i / Math.max(1, totalLines - 1)) * previewPositions[previewPositions.length - 1];
|
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}
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return;
|
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}
|
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|
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// 将块起始行映射到预览 DOM 索引
|
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const domCount = previewPositions.length;
|
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for (let i = 0; i < uniqueStarts.length; i++) {
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const lineIdx = uniqueStarts[i];
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const domIdx = Math.min(Math.floor((i / uniqueStarts.length) * domCount), domCount - 1);
|
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lineToPreviewMap[lineIdx] = previewPositions[domIdx];
|
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}
|
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|
||
// 线性插值填充所有行
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||
for (let i = 0; i < totalLines; i++) {
|
||
if (lineToPreviewMap[i] !== 0 && uniqueStarts.includes(i)) continue;
|
||
|
||
// 找到前后最近的已映射行
|
||
let prevLine = -1, nextLine = -1;
|
||
for (let j = i - 1; j >= 0; j--) {
|
||
if (lineToPreviewMap[j] !== 0 || uniqueStarts.includes(j)) { prevLine = j; break; }
|
||
}
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||
for (let j = i + 1; j < totalLines; j++) {
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||
if (lineToPreviewMap[j] !== 0 || uniqueStarts.includes(j)) { nextLine = j; break; }
|
||
}
|
||
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if (prevLine === -1 && nextLine === -1) {
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||
lineToPreviewMap[i] = 0;
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} else if (prevLine === -1) {
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lineToPreviewMap[i] = lineToPreviewMap[nextLine];
|
||
} else if (nextLine === -1) {
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lineToPreviewMap[i] = lineToPreviewMap[prevLine];
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} else {
|
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// 线性插值
|
||
const ratio = (i - prevLine) / (nextLine - prevLine);
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||
lineToPreviewMap[i] = lineToPreviewMap[prevLine] + ratio * (lineToPreviewMap[nextLine] - lineToPreviewMap[prevLine]);
|
||
}
|
||
}
|
||
}
|
||
|
||
function syncScroll() {
|
||
if (viewMode !== 'split') return;
|
||
const lineHeight = parseFloat(getComputedStyle(editor).lineHeight) || 20.8;
|
||
const scrollTop = editor.scrollTop;
|
||
const topLine = Math.floor(scrollTop / lineHeight);
|
||
|
||
if (!previewPositions || previewPositions.length === 0) cachePreviewPositions();
|
||
if (!previewPositions || previewPositions.length === 0) return;
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||
|
||
// 使用行号→预览位置映射表
|
||
if (lineToPreviewMap && topLine >= 0 && topLine < lineToPreviewMap.length) {
|
||
previewPanel.scrollTop = lineToPreviewMap[topLine];
|
||
} else {
|
||
// fallback: 线性比例映射
|
||
const totalLines = editor.value.split('\n').length;
|
||
const ratio = totalLines > 1 ? topLine / (totalLines - 1) : 0;
|
||
const targetIndex = Math.min(Math.floor(ratio * previewPositions.length), previewPositions.length - 1);
|
||
if (targetIndex >= 0 && previewPositions[targetIndex] !== undefined) {
|
||
previewPanel.scrollTop = previewPositions[targetIndex];
|
||
}
|
||
}
|
||
}
|
||
|
||
// ===== Schedule Update =====
|
||
function scheduleUpdate() {
|
||
if (updateTimer) clearTimeout(updateTimer);
|
||
updateTimer = setTimeout(() => {
|
||
renderMarkdown(editor.value);
|
||
updateLineNumbers();
|
||
updateFileSize();
|
||
cachePreviewPositions();
|
||
}, 150);
|
||
}
|
||
|
||
// ===== Helper =====
|
||
function getFileName(filePath) {
|
||
return filePath.split(/[/\\]/).pop();
|
||
}
|
||
|
||
// ===== Tab UI =====
|
||
function renderTabBar() {
|
||
tabList.innerHTML = '';
|
||
for (const tab of tabs) {
|
||
const el = document.createElement('div');
|
||
el.className = 'tab-item' + (tab.id === activeTabId ? ' active' : '') + (tab.isModified ? ' modified' : '');
|
||
el.dataset.tabId = tab.id;
|
||
|
||
const name = document.createElement('span');
|
||
name.className = 'tab-name';
|
||
name.textContent = tab.filePath ? getFileName(tab.filePath) : '未命名';
|
||
el.appendChild(name);
|
||
|
||
const close = document.createElement('button');
|
||
close.className = 'tab-close';
|
||
close.innerHTML = '<svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><line x1="18" y1="6" x2="6" y2="18"></line><line x1="6" y1="6" x2="18" y2="18"></line></svg>';
|
||
close.addEventListener('click', (e) => {
|
||
e.stopPropagation();
|
||
closeTab(tab.id);
|
||
});
|
||
el.appendChild(close);
|
||
|
||
el.addEventListener('click', () => switchToTab(tab.id));
|
||
tabList.appendChild(el);
|
||
}
|
||
}
|
||
|
||
function updateTitle() {
|
||
const tab = getActiveTab();
|
||
if (tab) {
|
||
const name = tab.filePath ? getFileName(tab.filePath) : '未命名';
|
||
const mod = tab.isModified ? ' *' : '';
|
||
document.title = `MarkLite - ${name}${mod}`;
|
||
statusText.textContent = name;
|
||
} else {
|
||
document.title = 'MarkLite';
|
||
statusText.textContent = '就绪';
|
||
}
|
||
}
|
||
|
||
// ===== Tab Operations =====
|
||
function getActiveTab() {
|
||
return tabs.find(t => t.id === activeTabId) || null;
|
||
}
|
||
|
||
function getTabIndex(tabId) {
|
||
return tabs.findIndex(t => t.id === tabId);
|
||
}
|
||
|
||
// Save current editor state into the active tab
|
||
function saveCurrentTabState() {
|
||
const tab = getActiveTab();
|
||
if (!tab) return;
|
||
tab.content = editor.value;
|
||
tab.scrollTop = editor.scrollTop;
|
||
tab.scrollLeft = editor.scrollLeft;
|
||
tab.selectionStart = editor.selectionStart;
|
||
tab.selectionEnd = editor.selectionEnd;
|
||
tab.previewScrollTop = previewPanel.scrollTop;
|
||
}
|
||
|
||
// Load a tab's state into the editor
|
||
function loadTabState(tab) {
|
||
// 使用 execCommand('insertText') 替换内容，保留 undo/redo 历史
|
||
// setRangeText 会清空 undo 栈，所以此处必须用 execCommand
|
||
editor.focus();
|
||
editor.select();
|
||
const inserted = document.execCommand('insertText', false, tab.content);
|
||
if (!inserted) {
|
||
// execCommand 被禁用时的 fallback（会丢失 undo 历史）
|
||
editor.value = tab.content;
|
||
}
|
||
lineCountCache = 0;
|
||
updateLineNumbers();
|
||
renderMarkdown(tab.content);
|
||
updateFileSize();
|
||
cachePreviewPositions();
|
||
|
||
// Restore scroll/selection on next frame
|
||
requestAnimationFrame(() => {
|
||
editor.scrollTop = tab.scrollTop;
|
||
editor.scrollLeft = tab.scrollLeft;
|
||
editor.setSelectionRange(tab.selectionStart, tab.selectionEnd);
|
||
previewPanel.scrollTop = tab.previewScrollTop;
|
||
updateCursorPosition();
|
||
});
|
||
|
||
// Update modified state
|
||
setModified(tab.isModified);
|
||
|
||
// Notify main process about active file
|
||
if (typeof window.electronAPI !== 'undefined') {
|
||
window.electronAPI.tabSwitched(tab.filePath);
|
||
}
|
||
}
|
||
|
||
function setModified(modified) {
|
||
const tab = getActiveTab();
|
||
if (tab) {
|
||
tab.isModified = modified;
|
||
// Toggle class directly instead of rebuilding entire tab bar
|
||
const tabEl = tabList.querySelector(`.tab-item[data-tab-id="${tab.id}"]`);
|
||
if (tabEl) tabEl.classList.toggle('modified', modified);
|
||
}
|
||
updateTitle();
|
||
}
|
||
|
||
// Create a new tab and switch to it
|
||
function createNewTab(filePath, content) {
|
||
// Check if file is already open
|
||
if (filePath) {
|
||
const existing = tabs.find(t => t.filePath === filePath);
|
||
if (existing) {
|
||
switchToTab(existing.id);
|
||
return existing;
|
||
}
|
||
}
|
||
|
||
const tab = createTab(filePath, content);
|
||
tabs.push(tab);
|
||
switchToTab(tab.id);
|
||
return tab;
|
||
}
|
||
|
||
// Switch to a specific tab
|
||
function switchToTab(tabId) {
|
||
if (tabId === activeTabId) return;
|
||
|
||
// Save current state
|
||
saveCurrentTabState();
|
||
|
||
// Switch
|
||
activeTabId = tabId;
|
||
const tab = getActiveTab();
|
||
if (!tab) return;
|
||
|
||
loadTabState(tab);
|
||
renderTabBar();
|
||
updateTitle();
|
||
welcomeScreen.classList.add('hidden');
|
||
}
|
||
|
||
// Close a tab
|
||
function closeTab(tabId) {
|
||
const index = getTabIndex(tabId);
|
||
if (index === -1) return;
|
||
|
||
const tab = tabs[index];
|
||
|
||
// If modified, confirm
|
||
if (tab.isModified) {
|
||
const name = tab.filePath ? getFileName(tab.filePath) : '未命名';
|
||
if (!confirm(`"${name}" 尚未保存，确定要关闭吗？`)) return;
|
||
}
|
||
|
||
// Remove tab
|
||
tabs.splice(index, 1);
|
||
|
||
// If we closed the active tab, switch to another
|
||
if (tabId === activeTabId) {
|
||
if (tabs.length === 0) {
|
||
// No tabs left - show welcome screen
|
||
activeTabId = null;
|
||
editor.value = '';
|
||
preview.innerHTML = '';
|
||
lineNumbers.innerHTML = '';
|
||
lineCountCache = 0;
|
||
statusSize.textContent = '';
|
||
statusSizeDivider.classList.remove('visible');
|
||
welcomeScreen.classList.remove('hidden');
|
||
document.title = 'MarkLite';
|
||
statusText.textContent = '就绪';
|
||
if (typeof window.electronAPI !== 'undefined') {
|
||
window.electronAPI.tabSwitched(null);
|
||
}
|
||
} else {
|
||
// Switch to nearest tab
|
||
const newIndex = Math.min(index, tabs.length - 1);
|
||
activeTabId = tabs[newIndex].id;
|
||
loadTabState(tabs[newIndex]);
|
||
}
|
||
}
|
||
|
||
renderTabBar();
|
||
updateTitle();
|
||
}
|
||
|
||
// ===== File Size Limit =====
|
||
const MAX_FILE_SIZE = 20 * 1024 * 1024; // 20MB
|
||
|
||
function formatFileSize(bytes) {
|
||
if (bytes < 1024) return bytes + ' B';
|
||
if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB';
|
||
return (bytes / (1024 * 1024)).toFixed(1) + ' MB';
|
||
}
|
||
|
||
// ===== File Operations =====
|
||
async function handleOpenFile() {
|
||
if (typeof window.electronAPI !== 'undefined') {
|
||
const result = await window.electronAPI.openFile();
|
||
if (result && !result.error) {
|
||
createNewTab(result.filePath, result.content);
|
||
}
|
||
} else {
|
||
const input = document.createElement('input');
|
||
input.type = 'file';
|
||
input.accept = '.md,.markdown,.txt';
|
||
input.multiple = true;
|
||
input.onchange = (e) => {
|
||
Array.from(e.target.files).forEach(file => {
|
||
const ext = file.name.substring(file.name.lastIndexOf('.')).toLowerCase();
|
||
if (!['.md', '.markdown', '.txt'].includes(ext)) return;
|
||
if (file.size > MAX_FILE_SIZE) {
|
||
alert(`"${file.name}" 过大（${formatFileSize(file.size)}），暂不支持超过 20MB 的文件`);
|
||
return;
|
||
}
|
||
const reader = new FileReader();
|
||
reader.onload = (ev) => {
|
||
createNewTab(file.name, ev.target.result);
|
||
};
|
||
reader.readAsText(file);
|
||
});
|
||
};
|
||
input.click();
|
||
}
|
||
}
|
||
|
||
async function handleSave() {
|
||
const tab = getActiveTab();
|
||
if (!tab) return;
|
||
|
||
if (typeof window.electronAPI !== 'undefined') {
|
||
const result = await window.electronAPI.saveFile({
|
||
filePath: tab.filePath,
|
||
content: editor.value
|
||
});
|
||
if (result.success) {
|
||
tab.filePath = result.filePath;
|
||
tab.content = editor.value;
|
||
tab.isModified = false;
|
||
renderTabBar();
|
||
updateTitle();
|
||
statusText.textContent = '已保存';
|
||
setTimeout(() => updateTitle(), 2000);
|
||
}
|
||
} else {
|
||
const blob = new Blob([editor.value], { type: 'text/markdown' });
|
||
const a = document.createElement('a');
|
||
a.href = URL.createObjectURL(blob);
|
||
a.download = tab.filePath || 'untitled.md';
|
||
a.click();
|
||
setTimeout(() => URL.revokeObjectURL(a.href), 1000);
|
||
tab.isModified = false;
|
||
renderTabBar();
|
||
updateTitle();
|
||
}
|
||
}
|
||
|
||
async function handleSaveAs() {
|
||
const tab = getActiveTab();
|
||
if (!tab) return;
|
||
|
||
if (typeof window.electronAPI !== 'undefined') {
|
||
const result = await window.electronAPI.saveFileAs({ content: editor.value });
|
||
if (result.success) {
|
||
tab.filePath = result.filePath;
|
||
tab.content = editor.value;
|
||
tab.isModified = false;
|
||
renderTabBar();
|
||
updateTitle();
|
||
statusText.textContent = '已保存';
|
||
setTimeout(() => updateTitle(), 2000);
|
||
}
|
||
} else {
|
||
handleSave();
|
||
}
|
||
}
|
||
|
||
// ===== View Mode =====
|
||
function setViewMode(mode) {
|
||
viewMode = mode;
|
||
const app = document.getElementById('app');
|
||
app.classList.remove('mode-editor', 'mode-preview');
|
||
btnSplit.classList.remove('active');
|
||
btnEditor.classList.remove('active');
|
||
btnPreview.classList.remove('active');
|
||
|
||
switch (mode) {
|
||
case 'split':
|
||
btnSplit.classList.add('active');
|
||
break;
|
||
case 'editor':
|
||
btnEditor.classList.add('active');
|
||
app.classList.add('mode-editor');
|
||
break;
|
||
case 'preview':
|
||
btnPreview.classList.add('active');
|
||
app.classList.add('mode-preview');
|
||
renderMarkdown(editor.value);
|
||
break;
|
||
}
|
||
saveSetting('viewMode', mode);
|
||
}
|
||
|
||
// ===== Resizer =====
|
||
let isResizing = false;
|
||
|
||
function initResizer() {
|
||
const settings = loadSettings();
|
||
if (settings.splitRatio) {
|
||
editorPanel.style.flex = `0 0 ${settings.splitRatio}%`;
|
||
previewPanel.style.flex = `0 0 ${100 - settings.splitRatio}%`;
|
||
}
|
||
|
||
resizer.addEventListener('mousedown', (e) => {
|
||
isResizing = true;
|
||
resizer.classList.add('active');
|
||
document.body.style.cursor = 'col-resize';
|
||
document.body.style.userSelect = 'none';
|
||
e.preventDefault();
|
||
});
|
||
|
||
document.addEventListener('mousemove', (e) => {
|
||
if (!isResizing) return;
|
||
const rect = mainContent.getBoundingClientRect();
|
||
const pct = Math.max(20, Math.min(80, ((e.clientX - rect.left) / rect.width) * 100));
|
||
editorPanel.style.flex = `0 0 ${pct}%`;
|
||
previewPanel.style.flex = `0 0 ${100 - pct}%`;
|
||
saveSetting('splitRatio', pct);
|
||
});
|
||
|
||
document.addEventListener('mouseup', () => {
|
||
if (isResizing) {
|
||
isResizing = false;
|
||
resizer.classList.remove('active');
|
||
document.body.style.cursor = '';
|
||
document.body.style.userSelect = '';
|
||
}
|
||
});
|
||
}
|
||
|
||
// ===== Drag & Drop =====
|
||
function initDragDrop() {
|
||
let dragCounter = 0;
|
||
|
||
document.addEventListener('dragenter', (e) => {
|
||
e.preventDefault();
|
||
e.stopPropagation();
|
||
dragCounter++;
|
||
dropOverlay.classList.remove('hidden');
|
||
});
|
||
|
||
document.addEventListener('dragleave', (e) => {
|
||
e.preventDefault();
|
||
e.stopPropagation();
|
||
dragCounter--;
|
||
if (dragCounter === 0) dropOverlay.classList.add('hidden');
|
||
});
|
||
|
||
document.addEventListener('dragover', (e) => {
|
||
e.preventDefault();
|
||
e.stopPropagation();
|
||
});
|
||
|
||
document.addEventListener('drop', async (e) => {
|
||
e.preventDefault();
|
||
e.stopPropagation();
|
||
dragCounter = 0;
|
||
dropOverlay.classList.add('hidden');
|
||
|
||
const files = e.dataTransfer.files;
|
||
const allowedExts = ['.md', '.markdown', '.txt'];
|
||
for (const file of files) {
|
||
const filePath = file.path;
|
||
const ext = filePath ? filePath.substring(filePath.lastIndexOf('.')).toLowerCase() : '';
|
||
if (!allowedExts.includes(ext)) continue;
|
||
// Electron 主进程已有文件大小检查，此处为浏览器模式兜底
|
||
if (file.size > MAX_FILE_SIZE) {
|
||
alert(`"${file.name}" 过大（${formatFileSize(file.size)}），暂不支持超过 20MB 的文件`);
|
||
continue;
|
||
}
|
||
if (filePath && typeof window.electronAPI !== 'undefined') {
|
||
const result = await window.electronAPI.readFile(filePath);
|
||
if (result.success) {
|
||
createNewTab(filePath, result.content);
|
||
}
|
||
} else {
|
||
const reader = new FileReader();
|
||
reader.onload = (ev) => createNewTab(file.name, ev.target.result);
|
||
reader.readAsText(file);
|
||
}
|
||
}
|
||
});
|
||
}
|
||
|
||
// ===== Keyboard Shortcuts =====
|
||
function initKeyboard() {
|
||
document.addEventListener('keydown', (e) => {
|
||
if (e.ctrlKey && e.key === 'o') { e.preventDefault(); handleOpenFile(); }
|
||
if (e.ctrlKey && e.key === 's' && !e.shiftKey) { e.preventDefault(); handleSave(); }
|
||
if (e.ctrlKey && e.shiftKey && e.key === 'S') { e.preventDefault(); handleSaveAs(); }
|
||
if (e.ctrlKey && e.key === '1') { e.preventDefault(); setViewMode('split'); }
|
||
if (e.ctrlKey && e.key === '2') { e.preventDefault(); setViewMode('editor'); }
|
||
if (e.ctrlKey && e.key === '3') { e.preventDefault(); setViewMode('preview'); }
|
||
if (e.ctrlKey && e.key === 't') { e.preventDefault(); createNewTab(null, ''); }
|
||
if (e.ctrlKey && e.key === 'w') { e.preventDefault(); if (activeTabId) closeTab(activeTabId); }
|
||
// Ctrl+Tab / Ctrl+Shift+Tab to cycle tabs
|
||
if (e.ctrlKey && e.key === 'Tab') {
|
||
e.preventDefault();
|
||
if (tabs.length > 1) {
|
||
const idx = getTabIndex(activeTabId);
|
||
const next = e.shiftKey
|
||
? (idx - 1 + tabs.length) % tabs.length
|
||
: (idx + 1) % tabs.length;
|
||
switchToTab(tabs[next].id);
|
||
}
|
||
}
|
||
});
|
||
}
|
||
|
||
// ===== Tab key support =====
|
||
function initEditorTab() {
|
||
editor.addEventListener('keydown', (e) => {
|
||
if (e.key === 'Tab') {
|
||
e.preventDefault();
|
||
// setRangeText 是标准 API，execCommand 已废弃但能保留 undo 历史
|
||
const start = editor.selectionStart;
|
||
const end = editor.selectionEnd;
|
||
if (start !== end) {
|
||
// 多行选区：批量缩进
|
||
const lines = editor.value.substring(start, end).split('\n');
|
||
const indented = lines.map(line => ' ' + line).join('\n');
|
||
editor.setRangeText(indented, start, end, 'end');
|
||
} else {
|
||
// 单光标：插入 4 空格
|
||
editor.setRangeText(' ', start, end, 'end');
|
||
}
|
||
scheduleUpdate();
|
||
}
|
||
});
|
||
}
|
||
|
||
// ===== External File Modification =====
|
||
function initFileWatch() {
|
||
if (typeof window.electronAPI === 'undefined') return;
|
||
|
||
window.electronAPI.onExternalModification((filePath) => {
|
||
// Only show banner if the modified file is the active tab
|
||
const tab = getActiveTab();
|
||
if (tab && tab.filePath === filePath) {
|
||
modifiedBanner.classList.remove('hidden');
|
||
}
|
||
});
|
||
|
||
btnReload.addEventListener('click', async () => {
|
||
const tab = getActiveTab();
|
||
if (!tab || !tab.filePath) return;
|
||
const result = await window.electronAPI.reloadFile();
|
||
if (result.success) {
|
||
editor.value = result.content;
|
||
tab.content = result.content;
|
||
tab.isModified = false;
|
||
lineCountCache = 0;
|
||
updateLineNumbers();
|
||
renderMarkdown(result.content);
|
||
updateCursorPosition();
|
||
updateFileSize();
|
||
cachePreviewPositions();
|
||
renderTabBar();
|
||
updateTitle();
|
||
}
|
||
modifiedBanner.classList.add('hidden');
|
||
});
|
||
|
||
btnDismiss.addEventListener('click', () => {
|
||
modifiedBanner.classList.add('hidden');
|
||
});
|
||
}
|
||
|
||
// ===== Unsaved Changes Warning =====
|
||
function initUnsavedWarning() {
|
||
const hasUnsaved = () => tabs.some(t => t.isModified);
|
||
|
||
if (typeof window.electronAPI === 'undefined') {
|
||
window.addEventListener('beforeunload', (e) => {
|
||
if (hasUnsaved()) { e.preventDefault(); e.returnValue = ''; }
|
||
});
|
||
return;
|
||
}
|
||
|
||
window.electronAPI.onConfirmClose(() => {
|
||
if (!hasUnsaved()) {
|
||
window.electronAPI.forceClose();
|
||
return;
|
||
}
|
||
const shouldClose = confirm('有文件尚未保存，确定要关闭吗？');
|
||
if (shouldClose) {
|
||
window.electronAPI.forceClose();
|
||
} else {
|
||
window.electronAPI.cancelClose();
|
||
}
|
||
});
|
||
}
|
||
|
||
// ===== Event Listeners =====
|
||
function initEventListeners() {
|
||
editor.addEventListener('input', () => {
|
||
const tab = getActiveTab();
|
||
if (tab) {
|
||
tab.isModified = true;
|
||
tab.content = editor.value;
|
||
setModified(true);
|
||
}
|
||
scheduleUpdate();
|
||
});
|
||
|
||
editor.addEventListener('scroll', () => {
|
||
syncScroll();
|
||
// 大文件滚动时重新渲染虚拟行号
|
||
if (lineCountCache > 2000) {
|
||
renderVirtualLineNumbers(lineCountCache);
|
||
}
|
||
});
|
||
editor.addEventListener('click', updateCursorPosition);
|
||
editor.addEventListener('keyup', updateCursorPosition);
|
||
editor.addEventListener('select', updateCursorPosition);
|
||
|
||
btnOpen.addEventListener('click', handleOpenFile);
|
||
btnSave.addEventListener('click', handleSave);
|
||
btnSplit.addEventListener('click', () => setViewMode('split'));
|
||
btnEditor.addEventListener('click', () => setViewMode('editor'));
|
||
btnPreview.addEventListener('click', () => setViewMode('preview'));
|
||
btnNewTab.addEventListener('click', () => createNewTab(null, ''));
|
||
|
||
btnWelcomeOpen.addEventListener('click', handleOpenFile);
|
||
btnWelcomeNew.addEventListener('click', () => createNewTab(null, ''));
|
||
|
||
if (typeof window.electronAPI !== 'undefined') {
|
||
// Remove old listeners first to prevent stacking
|
||
window.electronAPI.removeAllListeners('file:openInTab');
|
||
window.electronAPI.removeAllListeners('menu:save');
|
||
window.electronAPI.removeAllListeners('menu:saveAs');
|
||
window.electronAPI.removeAllListeners('menu:viewMode');
|
||
|
||
// Main process sends file to open in a new tab
|
||
window.electronAPI.onFileOpenInTab((data) => {
|
||
createNewTab(data.filePath, data.content);
|
||
});
|
||
|
||
window.electronAPI.onMenuSave(() => handleSave());
|
||
window.electronAPI.onMenuSaveAs(() => handleSaveAs());
|
||
window.electronAPI.onViewModeChange((mode) => setViewMode(mode));
|
||
}
|
||
}
|
||
|
||
// ===== Initialize =====
|
||
function init() {
|
||
initMarked();
|
||
initDarkMode();
|
||
initResizer();
|
||
initDragDrop();
|
||
initKeyboard();
|
||
initEditorTab();
|
||
initPreviewLinks();
|
||
initEventListeners();
|
||
initFileWatch();
|
||
initUnsavedWarning();
|
||
|
||
const settings = loadSettings();
|
||
setViewMode(settings.viewMode || 'split');
|
||
}
|
||
|
||
if (document.readyState === 'loading') {
|
||
document.addEventListener('DOMContentLoaded', init);
|
||
} else {
|
||
init();
|
||
}
|
||
})();
|