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toolbarConfig: Partial\u003CIToolbarConfig> = {\n  toolbarKeys: [\n    'bold',\n    'italic',\n    'underline',\n    'through',\n    '|',\n    'fontSize',\n    'fontFamily',\n    'color',\n    'bgColor',\n    '|',\n    'justifyLeft',\n    'justifyCenter',\n    'justifyRight',\n    '|',\n    'undo',\n    'redo',\n  ],\n}\n\nconst editorConfig: Partial\u003CIEditorConfig> = {\n  placeholder: '请输入文本...',\n  autoFocus: true,\n}\n\nuseEffect(() => {\n  return () => {\n    if (editor == null) return\n    editor.destroy()\n    setEditor(null)\n  }\n}, [editor])\n\nreturn (\n  \u003Cdiv className=\"...\">\n    \u003CToolbar editor={editor} defaultConfig={toolbarConfig} mode=\"simple\" \u002F>\n    \u003CEditor\n      defaultConfig={editorConfig}\n      value={value}\n      onCreated={setEditor}\n      onChange={(editor) => onChange(editor.getHtml())}\n      mode=\"simple\"\n      style={{ height: '200px', overflowY: 'auto' }}\n    \u002F>\n  \u003C\u002Fdiv>\n)\n","tsx","",[1108,1142,1138],{"__ignoreMap":1140},[1100,1144,1145,1146,1149,1150,1153,1154,1157],{},"这段封装里有几处值得留意的设计。工具栏的内容由 ",[1108,1147,1148],{},"toolbarConfig"," 中的 ",[1108,1151,1152],{},"toolbarKeys"," 显式列出，只保留了加粗、斜体、下划线、删除线，再加上字号、字体、文字颜色和背景色，以及左中右三种对齐方式，最后附上撤销与重做——刻意做减法，把菜单收敛到画布文本最常用的那几项。编辑器本身的配置 ",[1108,1155,1156],{},"editorConfig"," 也很克制，只设了占位符和自动聚焦；wangEditor 其实还支持诸如最大长度、自定义菜单一类更丰富的选项，但这里有意保持最小化，够用即可。",[1100,1159,1160,1161,1164,1165,1168,1169,1172,1173,1176,1177,1180,1181,1184],{},"生命周期管理放在 ",[1108,1162,1163],{},"useEffect"," 里完成：当组件卸载或者 ",[1108,1166,1167],{},"editor"," 实例发生变化时，会调用 ",[1108,1170,1171],{},"editor.destroy()"," 把旧实例销毁掉，防止内存泄漏。内容的同步则走一进一出两条路——初始的 HTML 由 ",[1108,1174,1175],{},"value"," 这个 prop 注入，而内容一旦变化，就通过 ",[1108,1178,1179],{},"onChange"," 回调里的 ",[1108,1182,1183],{},"editor.getHtml()"," 取出最新的 HTML 再向上通知父组件。",[1095,1186,1188],{"id":1187},"_0x02-bottomtexteditor-组件实现","0x02 BottomTextEditor 组件实现",[1100,1190,1191,1192,1194,1195,1198],{},"如果说 ",[1108,1193,1131],{}," 解决的是\"编辑器长什么样\"，那么 ",[1108,1196,1197],{},"BottomTextEditor"," 解决的就是\"编辑器怎么融进画布\"。它把富文本编辑器接入到画布的状态管理中，并且只在选中单个文本元素的场景下被激活：",[1134,1200,1203],{"className":1201,"code":1202,"language":1139,"meta":1140},[1137],"const { selectedIds, elements, updateElement } = useStore()\n\nconst selectedId = selectedIds.length === 1 ? selectedIds[0] : null\nconst element = selectedId ? elements[selectedId] : null\n\nconst [localHtml, setLocalHtml] = useState('')\n\nuseEffect(() => {\n  if (element && element.type === 'text') {\n    setLocalHtml(element.text || '')\n  }\n}, [element?.id, element?.text])\n\nconst handleChange = (html: string) => {\n  setLocalHtml(html)\n  const initialText = element.text || ''\n  updateElement(element.id, { text: html })\n\n  const updateCommand = new UpdateElementPropertyCommand(\n    {\n      id: element.id,\n      property: 'text',\n      oldValue: initialText,\n      newValue: html,\n    },\n    '修改文本内容',\n  )\n  undoRedoManager.executeCommand(updateCommand)\n}\n\nreturn (\n  \u003Cdiv className=\"fixed bottom-8 ... animate-slide-up\">\n    \u003CRichTextEditor value={localHtml} onChange={handleChange} \u002F>\n  \u003C\u002Fdiv>\n)\n",[1108,1204,1202],{"__ignoreMap":1140},[1100,1206,1207,1208,1211],{},"组件首先要判断当前该不该显示。它从 Zustand 的 ",[1108,1209,1210],{},"canvasStore"," 中取出选中的 ID 列表和元素集合，只有当恰好选中了一个、且类型为文本的元素时，才会把编辑器渲染出来。",[1100,1213,1214,1215,1218,1219,1222,1223,1225,1226,1229,1230,1232],{},"这里一个关键设计是维护了一份本地状态 ",[1108,1216,1217],{},"localHtml","。组件用 ",[1108,1220,1221],{},"useState"," 存了一份 HTML 的本地副本，并通过 ",[1108,1224,1163],{}," 在选中元素变化时把 store 里的 ",[1108,1227,1228],{},"element.text"," 同步过来。之所以要多此一层副本，是为了应对中文输入法在拼写组合阶段的麻烦：用拼音输入时，wangEditor 的 ",[1108,1231,1179],{}," 会非常频繁地触发，如果每一次都直接去改全局 store，很容易引发输入卡顿、光标乱跳甚至内容错乱。先用本地状态把这些高频的中间变化缓冲下来，就能避免对 store 的频繁冲击。",[1100,1234,1235,1236,1239,1240,1243,1244,1247],{},"内容变更的处理集中在 ",[1108,1237,1238],{},"handleChange"," 里，它做了三件事：先把最新的 HTML 写进本地状态；再实时调用 ",[1108,1241,1242],{},"updateElement"," 把改动同步到画布 store，驱动 canvas 重新渲染这个文本元素；最后创建一个 ",[1108,1245,1246],{},"UpdateElementPropertyCommand"," 命令并执行，命令里同时记录了修改前的旧值和修改后的新值，从而把这次编辑纳入完整的撤销\u002F重做历史。",[1095,1249,1251],{"id":1250},"_0x03-关键问题解决与设计","0x03 关键问题解决与设计",[1100,1253,1254,1255,1257,1258,1261],{},"回过头看，这套实现真正着力解决的是两个问题。一是输入法兼容性：中文输入过程中，组合事件（composition）会让编辑器反复触发变更，若在 ",[1108,1256,1179],{}," 里直接改全局状态，性能和体验都会受损，本实现借助 ",[1108,1259,1260],{},"setLocalHtml(html)"," 的本地缓冲缓解了这一点。二是实时渲染与历史管理的统一：一方面实时更新 store 保证画布上的文本能即时反映改动，另一方面又通过命令模式把每次操作记录下来，让 undo\u002Fredo 得到完整支持。",[1095,1263,1265],{"id":1264},"_0x04-当前实现的风险与不足","0x04 当前实现的风险与不足",[1100,1267,1268],{},"当前这套实现满足了基础的富文本编辑需求，但坦白说还留着几处明显的短板。",[1100,1270,1271,1272,1275,1276,1279],{},"输入法体验的优化并不彻底。虽然本地状态的缓冲缓解了 IME 组合阶段的频繁更新，但代码并没有真正去监听 ",[1108,1273,1274],{},"compositionstart"," 和 ",[1108,1277,1278],{},"compositionend"," 事件。在一些极端输入场景下，比如快速切换输入法或者连续输入长句，仍可能出现光标偏移、临时内容丢失的现象。",[1100,1281,1282],{},"内容净化与 XSS 防护也不够。目前完全依赖 wangEditor 自带的有限转义，没有引入 DOMPurify 这类专门的净化库。一旦用户插入外部链接、图片或自定义 HTML，就存在存储型或 DOM 型 XSS 的潜在风险，在内容后续被导出或分享的场景下尤其需要警惕。",[1100,1284,1285,1286,1289,1290,1293],{},"样式与对齐的精度同样存在隐患。wangEditor 生成的 HTML 往往带着多层 ",[1108,1287,1288],{},"span","、",[1108,1291,1292],{},"div"," 嵌套，这种结构和画布自定义的文本渲染逻辑未必完全吻合，结果就是编辑器里看到的预览效果，和画布最终渲染出来的样子在行高、字间距、对齐方式上会有细微出入。",[1100,1295,1296],{},"性能与内存方面也有可改进的余地。长文本场景下，频繁的实时更新——既要触发 store 更新又要记录命令——可能带来轻微卡顿；加上目前没有对编辑器实例做复用，在不同文本元素之间快速切换时会反复创建和销毁实例，平白增加内存开销。",[1100,1298,1299,1300,1303,1304,1306,1307,1309,1310,1312],{},"针对这些问题，后续有几条比较清晰的改进路径。XSS 方面，可以引入 DOMPurify，在内容存储前（提交到 store 或后端那一刻）以及渲染时都统一调用 ",[1108,1301,1302],{},"DOMPurify.sanitize"," 做严格过滤，并自定义一份白名单，既保留 wangEditor 必需的标签和属性，又把所有事件处理器和危险协议清理干净。输入法方面，可以在 ",[1108,1305,1131],{}," 里监听 composition 事件，组合阶段先按住不触发 ",[1108,1308,1238],{},"，等到 ",[1108,1311,1278],{}," 之后再统一更新 store 和命令记录，把输入延迟和光标问题进一步消除。性能方面，则可以做成单一的全局编辑器实例、根据选中元素动态切换内容来实现复用，并在长文本时加上防抖，减少那些不必要的 store 更新和命令执行。",{"title":1140,"searchDepth":1314,"depth":1314,"links":1315},4,[1316],{"id":1093,"depth":1317,"text":1093,"children":1318},2,[1319,1320,1321,1322,1323],{"id":1097,"depth":1314,"text":1098},{"id":1125,"depth":1314,"text":1126},{"id":1187,"depth":1314,"text":1188},{"id":1250,"depth":1314,"text":1251},{"id":1264,"depth":1314,"text":1265},"md",true,{"uuid":1327,"slots":1328},"1355fb60-e356-11f0-957a-89aa7dac40fe",{},{"title":1085,"description":1140},"posts\u002F2025\u002F2025-12-27-前端画布设计Vol-2-实现富文本编辑",[135,195,134,196],"GALD7rqkImm4IQxxa1snYCFV30ON1qUyknGsgPzuLcQ",1790443286914]