✨ Add extension management service

frontend/src/views/editor/basic/statsExtension.ts

@@ -0,0 +1,65 @@
+import {Extension} from '@codemirror/state';
+import {EditorView} from '@codemirror/view';
+import {DocumentStats} from '@/stores/editorStore';
+import {getActiveNoteBlock} from '@/views/editor/extensions/codeblock/state';
+
+// 更新编辑器文档统计信息
+export const updateStats = (
+  view: EditorView, 
+  updateDocumentStats: (stats: DocumentStats) => void
+) => {
+  if (!view) return;
+  
+  const state = view.state;
+  
+  // 获取当前光标所在的代码块
+  const activeBlock = getActiveNoteBlock(state as any);
+  
+  if (!activeBlock) {
+    // 如果没有活动块，显示空统计
+    updateDocumentStats({
+      lines: 0,
+      characters: 0,
+      selectedCharacters: 0
+    });
+    return;
+  }
+  
+  // 获取当前块的内容范围
+  const blockContent = state.doc.sliceString(activeBlock.content.from, activeBlock.content.to);
+  
+  // 计算块内容的行数
+  const blockLines = blockContent.split('\n').length;
+  
+  // 计算选中的字符数（只统计在当前块内的选中内容）
+  let selectedChars = 0;
+  const selections = state.selection;
+  if (selections) {
+    for (let i = 0; i < selections.ranges.length; i++) {
+      const range = selections.ranges[i];
+      // 计算选中范围与当前块内容范围的交集
+      const selectionStart = Math.max(range.from, activeBlock.content.from);
+      const selectionEnd = Math.min(range.to, activeBlock.content.to);
+      if (selectionStart < selectionEnd) {
+        selectedChars += selectionEnd - selectionStart;
+      }
+    }
+  }
+  
+  updateDocumentStats({
+    lines: blockLines,
+    characters: blockContent.length,
+    selectedCharacters: selectedChars
+  });
+};
+
+// 创建统计信息更新监听器扩展
+export const createStatsUpdateExtension = (
+  updateDocumentStats: (stats: DocumentStats) => void
+): Extension => {
+  return EditorView.updateListener.of(update => {
+    if (update.docChanged || update.selectionSet) {
+      updateStats(update.view, updateDocumentStats);
+    }
+  });
+};