refactor(qrcode): 优化文本转二维码为两步操作模式

- 将实时预览改为显式触发生成，用户体验更清晰
- 新增输入态（input）和预览态（preview）两种状态
- 输入态：显示输入框和生成按钮，右侧显示占位提示
- 预览态：显示只读文本预览和编辑按钮，右侧显示二维码
- 保存上次输入内容，返回编辑态时自动回填
- 添加空输入校验和错误提示
- 更新国际化文案
- 完善单元测试覆盖新功能

src/components/QrCodePreview.tsx

@@ -12,12 +12,15 @@ interface QrCodePreviewProps extends React.HTMLAttributes<HTMLDivElement> {
   onDownload: () => void;
   /** 复制回调 */
   onCopy: () => void;
+  /** 自定义占位文本，用于空状态提示 */
+  placeholderText?: string;
 }
 
 const QrCodePreview = ({
   qrCodeDataUrl,
   onDownload,
   onCopy,
+  placeholderText,
   className,
   ...props
 }: QrCodePreviewProps) => {
@@ -33,7 +36,9 @@ const QrCodePreview = ({
         )}
         {...props}
       >
-        <p className="text-sm text-muted-foreground text-center">{t('qrCode:qrCodeWillShow')}</p>
+        <p className="text-sm text-muted-foreground text-center">
+          {placeholderText || t('qrCode:qrCodeWillShow')}
+        </p>
       </div>
     );
   }

src/pages/QrCode/__tests__/index.test.tsx

@@ -7,6 +7,8 @@ vi.mock('lucide-react', async (importOriginal) => {
   return {
     ...actual,
     QrCode: () => <div data-testid="mock-lucide-qrcode">Icon</div>,
+    Pencil: () => <div data-testid="mock-lucide-pencil">Icon</div>,
+    Loader2: () => <div data-testid="mock-lucide-loader">Icon</div>,
   };
 });
 
@@ -25,26 +27,39 @@ vi.mock('@/config/features', async (importOriginal) => {
 });
 
 vi.mock('@/components/QrCodePreview', () => ({
-  default: () => <div data-testid="qr-code-preview">QrCodePreview</div>,
+  default: ({ placeholderText }: { placeholderText?: string }) => (
+    <div data-testid="qr-code-preview">
+      QrCodePreview
+      {placeholderText && <span data-testid="placeholder-text">{placeholderText}</span>}
+    </div>
+  ),
 }));
 
 vi.mock('@/components/ImageUploader', () => ({
   default: () => <div data-testid="image-uploader">ImageUploader</div>,
 }));
 
-vi.mock('qrious', () => ({
-  default: vi.fn().mockImplementation(() => ({
-    toDataURL: () => 'data:image/png;base64,mock',
-  })),
-}));
+vi.mock('qrious', () => {
+  return {
+    default: class QRious {
+      constructor() {
+        return {
+          toDataURL: () => 'data:image/png;base64,mock',
+        };
+      }
+    },
+  };
+});
 
 describe('QrCodePage', () => {
   beforeEach(() => {
     vi.clearAllMocks();
   });
 
-  it('应该默认渲染生成模式', () => {
+  it('应该默认渲染生成模式的输入态', () => {
     render(<QrCodePage />);
+    expect(screen.getByText('输入 URL 或文本')).toBeInTheDocument();
+    expect(screen.getByText('生成二维码')).toBeInTheDocument();
     expect(screen.getByTestId('qr-code-preview')).toBeInTheDocument();
   });
 
@@ -71,7 +86,7 @@ describe('QrCodePage', () => {
     expect(screen.getByTestId('qr-code-preview')).toBeInTheDocument();
   });
 
-  it('应该渲染输入区域的系统标签（对齐新版 Label 机制）', () => {
+  it('应该渲染输入区域的系统标签', () => {
     render(<QrCodePage />);
     expect(screen.getByText('输入 URL 或文本')).toBeInTheDocument();
   });
@@ -81,4 +96,85 @@ describe('QrCodePage', () => {
     const gridContainer = container.querySelector('.grid');
     expect(gridContainer).toBeInTheDocument();
   });
+
+  it('输入态应该显示生成按钮', () => {
+    render(<QrCodePage />);
+    const generateButton = screen.getByText('生成二维码');
+    expect(generateButton).toBeInTheDocument();
+    expect(generateButton).toBeDisabled(); // 空输入时按钮应该禁用
+  });
+
+  it('有输入内容时生成按钮应该可用', () => {
+    render(<QrCodePage />);
+    const textarea = screen.getByPlaceholderText('请输入 URL 或文本内容，将自动生成二维码');
+    fireEvent.change(textarea, { target: { value: 'https://example.com' } });
+
+    const generateButton = screen.getByText('生成二维码');
+    expect(generateButton).not.toBeDisabled();
+  });
+
+  it('点击生成按钮应该切换到预览态', () => {
+    render(<QrCodePage />);
+
+    // 输入文本
+    const textarea = screen.getByPlaceholderText('请输入 URL 或文本内容，将自动生成二维码');
+    fireEvent.change(textarea, { target: { value: 'https://example.com' } });
+
+    // 点击生成按钮
+    const generateButton = screen.getByText('生成二维码');
+    fireEvent.click(generateButton);
+
+    // 验证切换到预览态
+    expect(screen.getByText('原始文本')).toBeInTheDocument();
+    expect(screen.getByText('编辑')).toBeInTheDocument();
+    expect(screen.queryByText('生成二维码')).not.toBeInTheDocument();
+  });
+
+  it('预览态应该显示保存的文本', () => {
+    render(<QrCodePage />);
+
+    // 输入文本
+    const textarea = screen.getByPlaceholderText('请输入 URL 或文本内容，将自动生成二维码');
+    fireEvent.change(textarea, { target: { value: 'https://example.com' } });
+
+    // 点击生成按钮
+    fireEvent.click(screen.getByText('生成二维码'));
+
+    // 验证显示保存的文本
+    expect(screen.getByText('https://example.com')).toBeInTheDocument();
+  });
+
+  it('点击编辑按钮应该返回输入态', () => {
+    render(<QrCodePage />);
+
+    // 输入文本并生成
+    const textarea = screen.getByPlaceholderText('请输入 URL 或文本内容，将自动生成二维码');
+    fireEvent.change(textarea, { target: { value: 'https://example.com' } });
+    fireEvent.click(screen.getByText('生成二维码'));
+
+    // 点击编辑按钮
+    fireEvent.click(screen.getByText('编辑'));
+
+    // 验证返回输入态
+    expect(screen.getByText('输入 URL 或文本')).toBeInTheDocument();
+    expect(screen.getByText('生成二维码')).toBeInTheDocument();
+    expect(screen.queryByText('编辑')).not.toBeInTheDocument();
+  });
+
+  it('返回编辑态应该保留上次输入的内容', () => {
+    render(<QrCodePage />);
+
+    // 输入文本并生成
+    const textarea = screen.getByPlaceholderText('请输入 URL 或文本内容，将自动生成二维码');
+    fireEvent.change(textarea, { target: { value: 'https://example.com' } });
+    fireEvent.click(screen.getByText('生成二维码'));
+
+    // 点击编辑按钮
+    fireEvent.click(screen.getByText('编辑'));
+
+    // 验证输入框保留了上次的内容
+    const textareaAfterEdit =
+      screen.getByPlaceholderText('请输入 URL 或文本内容，将自动生成二维码');
+    expect(textareaAfterEdit).toHaveValue('https://example.com');
+  });
 });

src/pages/QrCode/components/GeneratePanel.tsx

@@ -1,49 +1,108 @@
+import { Loader2, Pencil, QrCode } from 'lucide-react';
 import TextInputArea from '@/components/TextInputArea';
 import QrCodePreview from '@/components/QrCodePreview';
 import { useI18n } from '@/utils/chromeI18n';
 import { useQrCodeContext } from '../contexts/QrCodeContext';
+import { Button } from '@/components/ui/button';
 import { Label } from '@/components/ui/label';
 import { cn } from '@/lib/utils';
 
 export default function GeneratePanel() {
   const { t } = useI18n('qrCode');
-  const { generatorState, setTextToEncode, downloadQrCode, copyQrCode } = useQrCodeContext();
+  const {
+    generatorState,
+    setTextToEncode,
+    confirmGenerate,
+    backToEdit,
+    downloadQrCode,
+    copyQrCode,
+  } = useQrCodeContext();
+
+  const isInputStep = generatorState.step === 'input';
+  const hasText = generatorState.textToEncode.trim().length > 0;
 
   return (
     <div className="grid grid-cols-1 md:grid-cols-2 gap-6 w-full items-stretch select-none p-0.5">
+      {/* 左侧：输入态显示输入框，预览态显示文本预览 */}
       <div
         className={cn(
           'border border-border rounded-xl bg-card text-card-foreground shadow-sm flex flex-col p-4',
-          'focus-within:ring-1 focus-within:ring-ring focus-within:border-ring',
+          isInputStep && 'focus-within:ring-1 focus-within:ring-ring focus-within:border-ring',
         )}
       >
         <div className="flex flex-col space-y-2.5 h-full">
-          <Label className="text-[10px] font-bold text-muted-foreground/90 uppercase tracking-wider select-none pl-0.5">
-            {t('qrCode:urlInputLabel')}
-          </Label>
+          <div className="flex items-center justify-between">
+            <Label className="text-[10px] font-bold text-muted-foreground/90 uppercase tracking-wider select-none pl-0.5">
+              {isInputStep ? t('qrCode:urlInputLabel') : t('qrCode:textPreviewLabel')}
+            </Label>
+
+            {/* 预览态显示编辑按钮 */}
+            {!isInputStep && (
+              <Button variant="ghost" size="sm" onClick={backToEdit} className="h-7 px-2 text-xs">
+                <Pencil className="w-3 h-3 mr-1" />
+                {t('qrCode:editButton')}
+              </Button>
+            )}
+          </div>
 
           <div className="flex-1 min-h-0">
-            <TextInputArea
-              value={generatorState.textToEncode}
-              onChange={setTextToEncode}
-              placeholder={t('qrCode:urlInputPlaceholder')}
-              showCount={true}
-              showClear={true}
-              allowCopy={true}
-              minRows={6}
-              maxRows={12}
-              externalError={generatorState.inputError || undefined}
-              onClear={() => setTextToEncode('')}
-            />
+            {isInputStep ? (
+              /* 输入态：可编辑的输入框 */
+              <TextInputArea
+                value={generatorState.textToEncode}
+                onChange={setTextToEncode}
+                placeholder={t('qrCode:urlInputPlaceholder')}
+                showCount={true}
+                showClear={true}
+                allowCopy={false}
+                minRows={6}
+                maxRows={12}
+                externalError={generatorState.inputError || undefined}
+                onClear={() => setTextToEncode('')}
+              />
+            ) : (
+              /* 预览态：只读文本预览 */
+              <div
+                className="h-full min-h-[150px] p-3 rounded-md border border-input bg-muted/50 overflow-auto"
+                title={generatorState.savedText}
+              >
+                <p className="text-sm text-foreground whitespace-pre-wrap break-all">
+                  {generatorState.savedText}
+                </p>
+              </div>
+            )}
           </div>
+
+          {/* 输入态显示生成按钮 */}
+          {isInputStep && (
+            <Button
+              onClick={confirmGenerate}
+              disabled={!hasText || generatorState.generating}
+              className="w-full"
+            >
+              {generatorState.generating ? (
+                <>
+                  <Loader2 className="w-4 h-4 mr-2 animate-spin" />
+                  {t('qrCode:generating')}
+                </>
+              ) : (
+                <>
+                  <QrCode className="w-4 h-4 mr-2" />
+                  {t('qrCode:generateButton')}
+                </>
+              )}
+            </Button>
+          )}
         </div>
       </div>
 
+      {/* 右侧：二维码预览区域 */}
       <div className="flex flex-col h-full">
         <QrCodePreview
           qrCodeDataUrl={generatorState.qrCodeDataUrl}
           onDownload={downloadQrCode}
           onCopy={copyQrCode}
+          placeholderText={isInputStep ? t('qrCode:generateFirstHint') : undefined}
         />
       </div>
     </div>

src/pages/QrCode/contexts/QrCodeContext.ts

@@ -8,6 +8,10 @@ export interface QrCodeContextValue {
 
   generatorState: QrCodeGeneratorState;
   setTextToEncode: (text: string) => void;
+  /** 显式触发生成二维码并切换到预览态 */
+  confirmGenerate: () => void;
+  /** 返回编辑态，保留上次输入内容 */
+  backToEdit: () => void;
 
   downloadQrCode: () => void;
   copyQrCode: () => Promise<void>;

src/pages/QrCode/hooks/useQrCode.ts

@@ -1,22 +1,51 @@
-import { useCallback, useMemo, useState } from 'react';
+import { useCallback, useState } from 'react';
 import QRious from 'qrious';
 import { toast } from 'sonner';
 import { parseQrCodeFromFile } from '@/utils/qrCodeParser';
 import { useContextMenuData } from '@/utils/useContextMenuData';
 import { useI18n } from '@/utils/chromeI18n';
-import { useDebounce } from '@/utils/useDebounce';
 import type { QrCodeContextValue } from '../contexts/QrCodeContext';
 import type { QrCodeGeneratorState, QrCodeMode, QrCodeParserState } from '../types';
 
+/** 生成二维码的核心逻辑 */
+function generateQrCodeDataUrl(text: string): string {
+  const trimmedText = text.trim();
+  if (!trimmedText) return '';
+
+  try {
+    let url = trimmedText;
+    if (!url.startsWith('http://') && !url.startsWith('https://')) {
+      url = 'https://' + url;
+    }
+
+    const isDark = document.documentElement.classList.contains('dark');
+
+    const qr = new QRious({
+      value: url,
+      size: 260,
+      level: 'H',
+      foreground: isDark ? '#f3f4f6' : '#0f172a',
+      background: isDark ? 'transparent' : '#ffffff',
+    });
+
+    return qr.toDataURL();
+  } catch (error) {
+    console.error('QR code generation failed:', error);
+    return '';
+  }
+}
+
 export function useQrCode(): QrCodeContextValue {
   const { t } = useI18n('qrCode');
 
   const [mode, setMode] = useState<QrCodeMode>('generate');
 
-  const [generatorState, setGeneratorState] = useState<
-    Omit<QrCodeGeneratorState, 'generating' | 'qrCodeDataUrl'>
-  >({
+  const [generatorState, setGeneratorState] = useState<QrCodeGeneratorState>({
+    step: 'input',
     textToEncode: '',
+    savedText: '',
+    qrCodeDataUrl: '',
+    generating: false,
     inputError: '',
   });
 
@@ -29,51 +58,64 @@ export function useQrCode(): QrCodeContextValue {
     dragging: false,
   });
 
-  const debouncedTextToEncode = useDebounce(generatorState.textToEncode, 200);
-
-  const qrCodeDataUrl = useMemo(() => {
-    const text = debouncedTextToEncode.trim();
-    if (!text) return '';
-
-    try {
-      let url = text;
-      if (!url.startsWith('http://') && !url.startsWith('https://')) {
-        url = 'https://' + url;
-      }
-
-      const isDark = document.documentElement.classList.contains('dark');
-
-      const qr = new QRious({
-        value: url,
-        size: 260,
-        level: 'H',
-        foreground: isDark ? '#f3f4f6' : '#0f172a',
-        background: isDark ? 'transparent' : '#ffffff',
-      });
-
-      return qr.toDataURL();
-    } catch (error) {
-      console.error('QR code generation sync task failed:', error);
-      return '';
-    }
-  }, [debouncedTextToEncode]);
-
-  const fullGeneratorState = useMemo<QrCodeGeneratorState>(
-    () => ({
-      ...generatorState,
-      qrCodeDataUrl,
-      generating: false,
-    }),
-    [generatorState, qrCodeDataUrl],
-  );
-
   const setTextToEncode = useCallback((text: string) => {
     setGeneratorState((prev) => ({ ...prev, textToEncode: text, inputError: '' }));
   }, []);
 
+  /** 显式触发生成二维码并切换到预览态 */
+  const confirmGenerate = useCallback(() => {
+    const text = generatorState.textToEncode.trim();
+
+    if (!text) {
+      setGeneratorState((prev) => ({ ...prev, inputError: t('qrCode:inputRequired') }));
+      toast.error(t('qrCode:inputRequired'));
+      return;
+    }
+
+    setGeneratorState((prev) => ({ ...prev, generating: true, inputError: '' }));
+
+    const qrCodeDataUrl = generateQrCodeDataUrl(text);
+
+    if (!qrCodeDataUrl) {
+      setGeneratorState((prev) => ({
+        ...prev,
+        generating: false,
+        inputError: t('qrCode:generateError'),
+      }));
+      toast.error(t('qrCode:generateError'));
+      return;
+    }
+
+    setGeneratorState((prev) => ({
+      ...prev,
+      step: 'preview',
+      savedText: text,
+      qrCodeDataUrl,
+      generating: false,
+    }));
+  }, [generatorState.textToEncode, t]);
+
+  /** 返回编辑态，保留上次输入内容 */
+  const backToEdit = useCallback(() => {
+    setGeneratorState((prev) => ({
+      ...prev,
+      step: 'input',
+      textToEncode: prev.savedText,
+      qrCodeDataUrl: '',
+      inputError: '',
+    }));
+  }, []);
+
   const handleContextMenuData = useCallback((payload: string) => {
     setMode('generate');
-    setGeneratorState((prev) => ({ ...prev, textToEncode: payload, inputError: '' }));
+    setGeneratorState((prev) => ({
+      ...prev,
+      step: 'input',
+      textToEncode: payload,
+      savedText: '',
+      qrCodeDataUrl: '',
+      inputError: '',
+    }));
   }, []);
 
   useContextMenuData({ featureKey: 'qrCode', onData: handleContextMenuData });
@@ -107,20 +149,20 @@ export function useQrCode(): QrCodeContextValue {
   );
 
   const downloadQrCode = useCallback(() => {
-    if (!qrCodeDataUrl) return;
+    if (!generatorState.qrCodeDataUrl) return;
 
     const link = document.createElement('a');
-    link.href = qrCodeDataUrl;
+    link.href = generatorState.qrCodeDataUrl;
     link.download = 'qrcode.png';
     link.click();
     toast.success(t('qrCode:qrCodeDownloadSuccess'));
-  }, [qrCodeDataUrl, t]);
+  }, [generatorState.qrCodeDataUrl, t]);
 
   const copyQrCode = useCallback(async () => {
-    if (!qrCodeDataUrl) return;
+    if (!generatorState.qrCodeDataUrl) return;
 
     try {
-      const response = await fetch(qrCodeDataUrl);
+      const response = await fetch(generatorState.qrCodeDataUrl);
       const blob = await response.blob();
 
       await navigator.clipboard.write([
@@ -134,7 +176,7 @@ export function useQrCode(): QrCodeContextValue {
       console.error('复制二维码失败:', error);
       toast.error(t('qrCode:copyError'));
     }
-  }, [qrCodeDataUrl, t]);
+  }, [generatorState.qrCodeDataUrl, t]);
 
   const handleFileChange = useCallback(
     (file: File) => {
@@ -178,8 +220,10 @@ export function useQrCode(): QrCodeContextValue {
   return {
     mode,
     setMode,
-    generatorState: fullGeneratorState,
+    generatorState,
     setTextToEncode,
+    confirmGenerate,
+    backToEdit,
     parseQrCode,
     downloadQrCode,
     copyQrCode,

src/pages/QrCode/types.ts

@@ -5,16 +5,23 @@
 /** 二维码功能核心主路由模式 */
 export type QrCodeMode = 'generate' | 'parse';
 
+/** 生成器的操作步骤 */
+export type GeneratorStep = 'input' | 'preview';
+
 /** * 二维码生成器的状态
- * 💡 架构优化：保留与全局 Context 骨架契合的形态，
- * 外部依然可以流畅读取这些状态，但在新架构下运行效率和稳定性大幅提升！
+ * 💡 架构优化：采用两步操作模式（输入态 → 预览态），
+ * 用户显式点击生成按钮后才生成二维码，体验更清晰！
  */
 export interface QrCodeGeneratorState {
+  /** 当前操作步骤：输入态或预览态 */
+  step: GeneratorStep;
   /** 受控的输入源文本（支持 URL 或任意文本快照） */
   textToEncode: string;
-  /** 由防抖源文本流在单次渲染内存中同步派生出的二维码 Base64 Data URL */
+  /** 保存的文本快照，用于预览态展示和编辑态回填 */
+  savedText: string;
+  /** 由用户显式触发生成的二维码 Base64 Data URL */
   qrCodeDataUrl: string;
-  /** 是否正在生成（流式架构下已默认为恒定 false 的非阻塞快照，保留作为 UI 骨架兼容） */
+  /** 是否正在生成 */
   generating: boolean;
   /** 输入文本校验或底层画布崩溃的错误提示信息 */
   inputError: string;