功能修复

src/App.vue

@@ -9,6 +9,8 @@ const content = ref("");
 const wordCount = ref(0);
 const charCount = ref(0);
 
+type DocumentMode = "preview" | "edit" | "mixed";
+
 // File state
 const currentFilePath = ref<string | null>(null);
 const saveStatus = ref("");
@@ -75,7 +77,7 @@ function onEditorWheel(e: WheelEvent) {
 
 // ---- toolbar state ----
 const showThumbnail = ref(true);
-const previewOnly = ref(false);
+const documentMode = ref<DocumentMode>("edit");
 const showMoreMenu = ref(false);
 
 function handleExportPdf() {
@@ -319,17 +321,33 @@ listen("menu-event", (event) => {
 
           <!-- Right: Actions -->
           <div class="flex items-center gap-0.5">
-            <!-- Preview/Edit toggle -->
+            <!-- Document mode -->
+            <div class="mode-toggle" role="group" aria-label="文档模式">
               <button
-                class="toolbar-btn"
+                  class="mode-toggle-btn"
-                :class="{ 'toolbar-btn-active': !previewOnly }"
+                  :class="{ 'mode-toggle-btn-active': documentMode === 'preview' }"
-                :title="previewOnly ? '切换到编辑模式' : '切换到预览模式'"
+                  title="预览模式"
-                @click="previewOnly = !previewOnly"
+                  @click="documentMode = 'preview'"
               >
-              <svg width="16" height="16" viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5">
+                预览
-                <path d="M11.5 1.5l3 3L5 14H2v-3L11.5 1.5z"/>
-              </svg>
               </button>
+              <button
+                  class="mode-toggle-btn"
+                  :class="{ 'mode-toggle-btn-active': documentMode === 'edit' }"
+                  title="编辑模式"
+                  @click="documentMode = 'edit'"
+              >
+                编辑
+              </button>
+              <button
+                  class="mode-toggle-btn"
+                  :class="{ 'mode-toggle-btn-active': documentMode === 'mixed' }"
+                  title="混合模式"
+                  @click="documentMode = 'mixed'"
+              >
+                混合
+              </button>
+            </div>
 
             <!-- More menu -->
             <div class="relative">
@@ -363,7 +381,7 @@ listen("menu-event", (event) => {
         </div>
         <MarkdownEditor
             :model-value="content"
-            :preview-only="previewOnly"
+            :document-mode="documentMode"
             placeholder="输入 Markdown 内容... 支持标题、粗体、斜体、代码块等 ✨"
             @update:model-value="onUpdate"
             @save-shortcut="doSave"
@@ -443,6 +461,47 @@ listen("menu-event", (event) => {
   background-color: #f4f1ea;
 }
 
+.mode-toggle {
+  display: inline-flex;
+  align-items: center;
+  height: 30px;
+  padding: 2px;
+  border: 1px solid #e0dbcf;
+  border-radius: 7px;
+  background-color: #f4f1ea;
+  flex-shrink: 0;
+}
+
+.mode-toggle-btn {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  height: 24px;
+  min-width: 42px;
+  padding: 0 9px;
+  border: none;
+  border-radius: 5px;
+  background: transparent;
+  color: #8c877d;
+  font-size: 12px;
+  line-height: 1;
+  cursor: pointer;
+  transition:
+    background-color 0.15s,
+    color 0.15s,
+    box-shadow 0.15s;
+}
+
+.mode-toggle-btn:hover {
+  color: #38342e;
+}
+
+.mode-toggle-btn-active {
+  background-color: #fffdfa;
+  color: #bf6a3b;
+  box-shadow: 0 1px 3px rgba(56, 52, 46, 0.12);
+}
+
 .dropdown-menu {
   position: absolute;
   right: 0;

src/components/MarkdownEditor.vue

@@ -1,5 +1,11 @@
 <script setup lang="ts">
-import { ref, watch, nextTick } from "vue";
+import {
+  computed,
+  nextTick,
+  ref,
+  watch,
+  type ComponentPublicInstance,
+} from "vue";
 import { unified } from "unified";
 import remarkParse from "remark-parse";
 import remarkGfm from "remark-gfm";
@@ -7,15 +13,34 @@ import remarkRehype from "remark-rehype";
 import rehypeStringify from "rehype-stringify";
 import rehypeSanitize from "rehype-sanitize";
 
+type DocumentMode = "preview" | "edit" | "mixed";
+
+interface MarkdownAstNode {
+  position?: {
+    start?: { offset?: number };
+    end?: { offset?: number };
+  };
+}
+
+interface MarkdownBlock {
+  id: string;
+  source: string;
+  html: string;
+  startOffset: number;
+  endOffset: number;
+}
+
 const props = withDefaults(
   defineProps<{
     modelValue?: string;
     placeholder?: string;
+    documentMode?: DocumentMode;
     previewOnly?: boolean;
   }>(),
   {
     modelValue: "",
     placeholder: "开始写作...",
+    documentMode: undefined,
     previewOnly: false,
   },
 );
@@ -35,10 +60,33 @@ const md2html = unified()
   .use(rehypeSanitize)
   .use(rehypeStringify);
 
+const mdParser = unified().use(remarkParse).use(remarkGfm);
+
+const activeDocumentMode = computed<DocumentMode>(() => {
+  return props.documentMode ?? (props.previewOnly ? "preview" : "edit");
+});
+
 // ── Rendering ──────────────────────────────────────────────────────
 
 const renderedHtml = ref("");
 const renderError = ref(false);
+const markdownBlocks = ref<MarkdownBlock[]>([]);
+
+const editorTextareaRef = ref<HTMLTextAreaElement>();
+const scrollRef = ref<HTMLDivElement>();
+const blockTextareaRef = ref<HTMLTextAreaElement | null>(null);
+
+const EMPTY_BLOCK_ID = "__empty__";
+const editingBlockId = ref<string | null>(null);
+const editingSource = ref("");
+const editingBaseValue = ref("");
+const editingRange = ref<{ startOffset: number; endOffset: number } | null>(
+  null,
+);
+const pendingLocalModelUpdate = ref(false);
+const isEditingEmptyDocument = computed(
+  () => editingBlockId.value === EMPTY_BLOCK_ID,
+);
 
 function renderFullHtml(md: string) {
   try {
@@ -51,13 +99,86 @@ function renderFullHtml(md: string) {
   }
 }
 
+function escapeHtml(value: string) {
+  return value
+    .replace(/&/g, "&amp;")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/"/g, "&quot;")
+    .replace(/'/g, "&#39;");
+}
+
+function renderBlockHtml(source: string) {
+  try {
+    const file = md2html.processSync(source);
+    return String(file.value);
+  } catch {
+    return `<pre><code>${escapeHtml(source)}</code></pre>`;
+  }
+}
+
+function parseBlocks(md: string) {
+  if (!md.trim()) {
+    markdownBlocks.value = [];
+    return;
+  }
+
+  try {
+    const tree = mdParser.parse(md) as { children?: MarkdownAstNode[] };
+    const blocks = (tree.children ?? [])
+      .map((node, index): MarkdownBlock | null => {
+        const startOffset = node.position?.start?.offset;
+        const endOffset = node.position?.end?.offset;
+
+        if (
+          typeof startOffset !== "number" ||
+          typeof endOffset !== "number" ||
+          endOffset < startOffset
+        ) {
+          return null;
+        }
+
+        const source = md.slice(startOffset, endOffset);
+        return {
+          id: `${index}-${startOffset}-${endOffset}`,
+          source,
+          html: renderBlockHtml(source),
+          startOffset,
+          endOffset,
+        };
+      })
+      .filter((block): block is MarkdownBlock => block !== null);
+
+    markdownBlocks.value = blocks;
+  } catch {
+    markdownBlocks.value = [
+      {
+        id: "fallback-0",
+        source: md,
+        html: renderBlockHtml(md),
+        startOffset: 0,
+        endOffset: md.length,
+      },
+    ];
+  }
+}
+
 watch(
   () => props.modelValue,
   (val) => {
+    const shouldResetScroll = !pendingLocalModelUpdate.value;
+    pendingLocalModelUpdate.value = false;
+
     renderFullHtml(val);
-    // 切换文件时重置滚动位置到顶部
+    parseBlocks(val);
+    if (editingBlockId.value && val !== editingBaseValue.value) {
+      cancelBlockEdit();
+    }
+
     nextTick(() => {
-      if (scrollRef.value) scrollRef.value.scrollTop = 0;
+      resizeEditorTextarea();
+      // 外部切换文件时重置滚动位置；本组件内编辑时保留当前位置。
+      if (shouldResetScroll && scrollRef.value) scrollRef.value.scrollTop = 0;
     });
   },
   { immediate: true },
@@ -65,18 +186,54 @@ watch(
 
 // ── Editor textarea handlers ───────────────────────────────────────
 
-const editorTextareaRef = ref<HTMLTextAreaElement>();
+function setBlockTextareaRef(el: Element | ComponentPublicInstance | null) {
-const scrollRef = ref<HTMLDivElement>();
+  blockTextareaRef.value = el instanceof HTMLTextAreaElement ? el : null;
-
-function onEditorInput(e: Event) {
-  const val = (e.target as HTMLTextAreaElement).value;
-  emit("update:modelValue", val);
-  renderFullHtml(val);
 }
 
-function tryAutoPair(
+function resizeTextarea(ta: HTMLTextAreaElement) {
+  ta.style.height = "auto";
+  ta.style.height = `${ta.scrollHeight}px`;
+}
+
+function resizeEditorTextarea() {
+  const ta = editorTextareaRef.value;
+  if (!ta) return;
+  resizeTextarea(ta);
+}
+
+function focusBlockEditor() {
+  void nextTick(() => {
+    const ta = blockTextareaRef.value;
+    if (!ta) return;
+    resizeTextarea(ta);
+    ta.focus();
+    ta.selectionStart = ta.selectionEnd = ta.value.length;
+  });
+}
+
+function emitModelValue(value: string) {
+  pendingLocalModelUpdate.value = true;
+  emit("update:modelValue", value);
+}
+
+function applyFullEditorValue(value: string) {
+  emitModelValue(value);
+  renderFullHtml(value);
+  parseBlocks(value);
+}
+
+function onEditorInput(e: Event) {
+  const ta = e.target as HTMLTextAreaElement;
+  const val = ta.value;
+  applyFullEditorValue(val);
+  resizeTextarea(ta);
+}
+
+function tryAutoPairForValue(
   ta: HTMLTextAreaElement,
   key: string,
+  value: string,
+  onChange: (nextValue: string) => void,
 ): boolean {
   const pairs: Record<string, string> = {
     "(": ")",
@@ -91,16 +248,15 @@ function tryAutoPair(
 
   const start = ta.selectionStart;
   const end = ta.selectionEnd;
-  const selected = props.modelValue.substring(start, end);
+  const selected = value.substring(start, end);
   const newVal =
-    props.modelValue.substring(0, start) +
+    value.substring(0, start) +
     key +
     selected +
     close +
-    props.modelValue.substring(end);
+    value.substring(end);
 
-  emit("update:modelValue", newVal);
+  onChange(newVal);
-  renderFullHtml(newVal);
 
   void nextTick(() => {
     ta.selectionStart = start + 1;
@@ -110,6 +266,10 @@ function tryAutoPair(
   return true;
 }
 
+function tryAutoPair(ta: HTMLTextAreaElement, key: string): boolean {
+  return tryAutoPairForValue(ta, key, props.modelValue, applyFullEditorValue);
+}
+
 function onEditorKeydown(e: KeyboardEvent) {
   if ((e.ctrlKey || e.metaKey) && e.key === "s") {
     e.preventDefault();
@@ -127,8 +287,7 @@ function onEditorKeydown(e: KeyboardEvent) {
       props.modelValue.substring(0, start) +
       "  " +
       props.modelValue.substring(end);
-    emit("update:modelValue", newVal);
+    applyFullEditorValue(newVal);
-    renderFullHtml(newVal);
     void nextTick(() => {
       ta.selectionStart = ta.selectionEnd = start + 2;
       ta.focus();
@@ -141,6 +300,121 @@ function onEditorKeydown(e: KeyboardEvent) {
     return;
   }
 }
+
+// ── Mixed mode block editing ───────────────────────────────────────
+
+function startBlockEdit(block: MarkdownBlock) {
+  if (activeDocumentMode.value !== "mixed") return;
+  if (editingBlockId.value && editingBlockId.value !== block.id) {
+    finalizeBlockEdit();
+  }
+
+  editingBlockId.value = block.id;
+  editingSource.value = block.source;
+  editingBaseValue.value = props.modelValue;
+  editingRange.value = {
+    startOffset: block.startOffset,
+    endOffset: block.endOffset,
+  };
+  focusBlockEditor();
+}
+
+function startEmptyBlockEdit() {
+  if (activeDocumentMode.value !== "mixed") return;
+  editingBlockId.value = EMPTY_BLOCK_ID;
+  editingSource.value = props.modelValue;
+  editingBaseValue.value = props.modelValue;
+  editingRange.value = {
+    startOffset: 0,
+    endOffset: props.modelValue.length,
+  };
+  focusBlockEditor();
+}
+
+function cancelBlockEdit() {
+  editingBlockId.value = null;
+  editingSource.value = "";
+  editingBaseValue.value = "";
+  editingRange.value = null;
+}
+
+function finalizeBlockEdit() {
+  const range = editingRange.value;
+  if (!editingBlockId.value || !range) {
+    cancelBlockEdit();
+    return;
+  }
+
+  const nextValue =
+    props.modelValue.slice(0, range.startOffset) +
+    editingSource.value +
+    props.modelValue.slice(range.endOffset);
+
+  cancelBlockEdit();
+
+  if (nextValue !== props.modelValue) {
+    emitModelValue(nextValue);
+    renderFullHtml(nextValue);
+    parseBlocks(nextValue);
+  }
+}
+
+function onBlockInput(e: Event) {
+  const ta = e.target as HTMLTextAreaElement;
+  editingSource.value = ta.value;
+  resizeTextarea(ta);
+}
+
+function onBlockKeydown(e: KeyboardEvent) {
+  const ta = e.target as HTMLTextAreaElement;
+
+  if ((e.ctrlKey || e.metaKey) && e.key === "s") {
+    e.preventDefault();
+    finalizeBlockEdit();
+    emit("save-shortcut");
+    return;
+  }
+
+  if (e.key === "Escape") {
+    e.preventDefault();
+    cancelBlockEdit();
+    return;
+  }
+
+  if (e.key === "Tab") {
+    e.preventDefault();
+    const start = ta.selectionStart;
+    const end = ta.selectionEnd;
+    editingSource.value =
+      editingSource.value.substring(0, start) +
+      "  " +
+      editingSource.value.substring(end);
+    void nextTick(() => {
+      ta.selectionStart = ta.selectionEnd = start + 2;
+      resizeTextarea(ta);
+      ta.focus();
+    });
+    return;
+  }
+
+  if (
+    tryAutoPairForValue(ta, e.key, editingSource.value, (nextValue) => {
+      editingSource.value = nextValue;
+      void nextTick(() => resizeTextarea(ta));
+    })
+  ) {
+    e.preventDefault();
+  }
+}
+
+watch(activeDocumentMode, (mode, oldMode) => {
+  if (oldMode === "mixed" && mode !== "mixed" && editingBlockId.value) {
+    finalizeBlockEdit();
+  }
+  if (mode === "edit") {
+    void nextTick(resizeEditorTextarea);
+  }
+});
 </script>
 
 <template>
@@ -158,12 +432,13 @@ function onEditorKeydown(e: KeyboardEvent) {
     >
       <!-- Editor mode -->
       <textarea
-        v-if="!previewOnly"
+        v-if="activeDocumentMode === 'edit'"
         ref="editorTextareaRef"
         :value="props.modelValue"
         :placeholder="props.placeholder"
         class="
-          w-full h-full min-h-[60vh] resize-none bg-transparent outline-none
+          markdown-source-editor
+          w-full min-h-[60vh] resize-none overflow-hidden bg-transparent outline-none
           font-serif text-[#38342e] leading-relaxed
           placeholder:text-[#b8b3a8]
         "
@@ -172,12 +447,68 @@ function onEditorKeydown(e: KeyboardEvent) {
       />
 
       <!-- Preview mode -->
-      <div v-else class="min-h-[60vh]">
+      <div v-else-if="activeDocumentMode === 'preview'" class="min-h-[60vh]">
         <div v-if="renderError" class="text-red-500 text-sm">
           ⚠ Markdown 解析错误
         </div>
         <div v-else class="markdown-preview" v-html="renderedHtml" />
       </div>
+
+      <!-- Mixed mode -->
+      <div v-else class="min-h-[60vh] markdown-preview markdown-mixed">
+        <div v-if="renderError" class="text-red-500 text-sm">
+          ⚠ Markdown 解析错误
+        </div>
+        <textarea
+          v-else-if="isEditingEmptyDocument"
+          :ref="setBlockTextareaRef"
+          :value="editingSource"
+          :placeholder="props.placeholder"
+          class="markdown-block-editor"
+          @input="onBlockInput"
+          @keydown="onBlockKeydown"
+          @blur="finalizeBlockEdit"
+        />
+        <div
+          v-else-if="!props.modelValue.trim()"
+          class="markdown-empty-placeholder"
+          role="button"
+          tabindex="0"
+          @click="startEmptyBlockEdit"
+          @keydown.enter.prevent="startEmptyBlockEdit"
+          @keydown.space.prevent="startEmptyBlockEdit"
+        >
+          {{ props.placeholder }}
+        </div>
+        <template v-else>
+          <div
+            v-for="block in markdownBlocks"
+            :key="block.id"
+            class="markdown-block"
+            :class="{ 'markdown-block-editing': editingBlockId === block.id }"
+          >
+            <textarea
+              v-if="editingBlockId === block.id"
+              :ref="setBlockTextareaRef"
+              :value="editingSource"
+              class="markdown-block-editor"
+              @input="onBlockInput"
+              @keydown="onBlockKeydown"
+              @blur="finalizeBlockEdit"
+            />
+            <div
+              v-else
+              class="markdown-block-preview"
+              role="button"
+              tabindex="0"
+              v-html="block.html"
+              @click="startBlockEdit(block)"
+              @keydown.enter.prevent="startBlockEdit(block)"
+              @keydown.space.prevent="startBlockEdit(block)"
+            />
+          </div>
+        </template>
+      </div>
     </div>
   </div>
 </template>
@@ -194,6 +525,15 @@ function onEditorKeydown(e: KeyboardEvent) {
 
 .markdown-preview > *:first-child { margin-top: 0; }
 
+.markdown-source-editor {
+  display: block;
+  height: auto;
+}
+
+.markdown-mixed > .markdown-block:first-child .markdown-block-preview > *:first-child {
+  margin-top: 0;
+}
+
 .markdown-preview h1,
 .markdown-preview h2,
 .markdown-preview h3,
@@ -293,4 +633,68 @@ function onEditorKeydown(e: KeyboardEvent) {
   border-radius: 0.25rem;
   margin: 0.5em 0;
 }
+
+/* ── Mixed mode block editing ────────────────────────────────────── */
+
+.markdown-block {
+  margin: -1px -0.375rem;
+  padding: 1px 0.375rem;
+  border-radius: 0.375rem;
+  transition:
+    background-color 0.15s ease,
+    box-shadow 0.15s ease;
+}
+
+.markdown-block:hover {
+  background-color: #f4f1ea;
+  cursor: text;
+}
+
+.markdown-block-editing,
+.markdown-block-editing:hover {
+  background-color: transparent;
+}
+
+.markdown-block-preview {
+  min-height: 1.625em;
+  outline: none;
+}
+
+.markdown-block-preview:focus-visible,
+.markdown-empty-placeholder:focus-visible {
+  outline: 2px solid #d6aa8e;
+  outline-offset: 2px;
+  border-radius: 0.25rem;
+}
+
+.markdown-block-editor {
+  display: block;
+  width: 100%;
+  min-height: 4rem;
+  resize: none;
+  overflow: hidden;
+  border: 1px solid #d6aa8e;
+  border-radius: 0.375rem;
+  background-color: #fffdfa;
+  color: #38342e;
+  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
+  font-size: 0.92em;
+  line-height: 1.6;
+  margin: 0.375rem 0;
+  padding: 0.75rem 0.875rem;
+  outline: none;
+  box-shadow: 0 0 0 3px rgba(191, 106, 59, 0.08);
+}
+
+.markdown-block-editor::placeholder,
+.markdown-empty-placeholder {
+  color: #b8b3a8;
+}
+
+.markdown-empty-placeholder {
+  min-height: 12rem;
+  padding-top: 0.25rem;
+  cursor: text;
+  outline: none;
+}
 </style>