From fe6f3f11291e204661f1685325e4b666ac0fac8b Mon Sep 17 00:00:00 2001
From: zihanjian <zihanjian@bytedance.com>
Date: Fri, 6 Jun 2025 14:41:29 +0800
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---
 src/app/page.tsx                             |  96 +++++++
 src/components/FloatingToolbar.tsx           |  21 +-
 src/components/MagnifierSelectionOverlay.tsx | 264 +++++++++++++++++
 src/components/MagnifierTool.tsx             | 281 +++++++++++++++++++
 4 files changed, 661 insertions(+), 1 deletion(-)
 create mode 100644 src/components/MagnifierSelectionOverlay.tsx
 create mode 100644 src/components/MagnifierTool.tsx

diff --git a/src/app/page.tsx b/src/app/page.tsx
index f2af498..9b37dc3 100644
--- a/src/app/page.tsx
+++ b/src/app/page.tsx
@@ -87,6 +87,8 @@ import GridTooltip from '../components/GridTooltip';
 import CustomPaletteEditor from '../components/CustomPaletteEditor';
 import FloatingColorPalette from '../components/FloatingColorPalette';
 import FloatingToolbar from '../components/FloatingToolbar';
+import MagnifierTool from '../components/MagnifierTool';
+import MagnifierSelectionOverlay from '../components/MagnifierSelectionOverlay';
 import { loadPaletteSelections, savePaletteSelections, presetToSelections, PaletteSelections } from '../utils/localStorageUtils';
 import { TRANSPARENT_KEY, transparentColorData } from '../utils/pixelEditingUtils';
 
@@ -161,6 +163,70 @@ export default function Home() {
   // 新增：悬浮调色盘状态
   const [isFloatingPaletteOpen, setIsFloatingPaletteOpen] = useState<boolean>(true);
 
+  // 新增：放大镜状态
+  const [isMagnifierActive, setIsMagnifierActive] = useState<boolean>(false);
+  const [magnifierSelectionArea, setMagnifierSelectionArea] = useState<{
+    startRow: number;
+    startCol: number;
+    endRow: number;
+    endCol: number;
+  } | null>(null);
+
+  // 放大镜切换处理函数
+  const handleToggleMagnifier = () => {
+    setIsMagnifierActive(!isMagnifierActive);
+  };
+
+  // 放大镜像素编辑处理函数
+  const handleMagnifierPixelEdit = (row: number, col: number, colorData: { key: string; color: string }) => {
+    if (!mappedPixelData) return;
+    
+    // 创建新的像素数据
+    const newMappedPixelData = mappedPixelData.map((rowData, r) =>
+      rowData.map((pixel, c) => {
+        if (r === row && c === col) {
+          return { 
+            key: colorData.key, 
+            color: colorData.color 
+          } as MappedPixel;
+        }
+        return pixel;
+      })
+    );
+    
+    setMappedPixelData(newMappedPixelData);
+    
+    // 更新颜色统计
+    if (colorCounts) {
+      const newColorCounts = { ...colorCounts };
+      
+      // 减少原颜色的计数
+      const oldPixel = mappedPixelData[row][col];
+      if (newColorCounts[oldPixel.key]) {
+        newColorCounts[oldPixel.key].count--;
+        if (newColorCounts[oldPixel.key].count === 0) {
+          delete newColorCounts[oldPixel.key];
+        }
+      }
+      
+      // 增加新颜色的计数
+      if (newColorCounts[colorData.key]) {
+        newColorCounts[colorData.key].count++;
+      } else {
+        newColorCounts[colorData.key] = {
+          count: 1,
+          color: colorData.color
+        };
+      }
+      
+      setColorCounts(newColorCounts);
+      
+      // 更新总计数
+      const newTotal = Object.values(newColorCounts).reduce((sum, item) => sum + item.count, 0);
+      setTotalBeadCount(newTotal);
+    }
+  };
+
   const originalCanvasRef = useRef<HTMLCanvasElement>(null);
   const pixelatedCanvasRef = useRef<HTMLCanvasElement>(null);
   const fileInputRef = useRef<HTMLInputElement>(null);
@@ -2074,7 +2140,10 @@ export default function Home() {
             step: 'select-source'
           });
           setHighlightColorKey(null);
+          setIsMagnifierActive(false);
         }}
+        onToggleMagnifier={handleToggleMagnifier}
+        isMagnifierActive={isMagnifierActive}
       />
 
       {/* 悬浮调色盘 */}
@@ -2098,6 +2167,33 @@ export default function Home() {
         />
       )}
 
+      {/* 放大镜工具 */}
+      {isManualColoringMode && (
+        <>
+          <MagnifierTool
+            isActive={isMagnifierActive}
+            onToggle={handleToggleMagnifier}
+            mappedPixelData={mappedPixelData}
+            gridDimensions={gridDimensions}
+            selectedColor={selectedColor}
+            selectedColorSystem={selectedColorSystem}
+            onPixelEdit={handleMagnifierPixelEdit}
+            cellSize={gridDimensions ? Math.min(6, Math.max(4, 500 / Math.max(gridDimensions.N, gridDimensions.M))) : 6}
+            selectionArea={magnifierSelectionArea}
+            onClearSelection={() => setMagnifierSelectionArea(null)}
+          />
+          
+          {/* 放大镜选择覆盖层 */}
+          <MagnifierSelectionOverlay
+            isActive={isMagnifierActive && !magnifierSelectionArea}
+            canvasRef={pixelatedCanvasRef}
+            gridDimensions={gridDimensions}
+            cellSize={gridDimensions ? Math.min(6, Math.max(4, 500 / Math.max(gridDimensions.N, gridDimensions.M))) : 6}
+            onSelectionComplete={setMagnifierSelectionArea}
+          />
+        </>
+      )}
+
       {/* Apply dark mode styles to the Footer */}
       <footer className="w-full md:max-w-4xl mt-10 mb-6 py-6 text-center text-xs sm:text-sm text-gray-500 dark:text-gray-400 border-t border-gray-200 dark:border-gray-700 bg-gradient-to-b from-white to-gray-50 dark:from-gray-900 dark:to-gray-800/50 rounded-lg shadow-inner">
 
diff --git a/src/components/FloatingToolbar.tsx b/src/components/FloatingToolbar.tsx
index 92afdbc..fd58ba0 100644
--- a/src/components/FloatingToolbar.tsx
+++ b/src/components/FloatingToolbar.tsx
@@ -7,13 +7,17 @@ interface FloatingToolbarProps {
   isPaletteOpen: boolean;
   onTogglePalette: () => void;
   onExitManualMode: () => void;
+  onToggleMagnifier: () => void;
+  isMagnifierActive: boolean;
 }
 
 const FloatingToolbar: React.FC<FloatingToolbarProps> = ({
   isManualColoringMode,
   isPaletteOpen,
   onTogglePalette,
-  onExitManualMode
+  onExitManualMode,
+  onToggleMagnifier,
+  isMagnifierActive
 }) => {
   if (!isManualColoringMode) return null;
 
@@ -34,6 +38,21 @@ const FloatingToolbar: React.FC<FloatingToolbarProps> = ({
         </svg>
       </button>
 
+      {/* 放大镜按钮 */}
+      <button
+        onClick={onToggleMagnifier}
+        className={`w-12 h-12 rounded-full shadow-lg transition-all duration-200 flex items-center justify-center ${
+          isMagnifierActive
+            ? 'bg-green-500 text-white hover:bg-green-600'
+            : 'bg-white dark:bg-gray-800 text-gray-700 dark:text-gray-300 hover:bg-gray-50 dark:hover:bg-gray-700 border border-gray-200 dark:border-gray-600'
+        }`}
+        title={isMagnifierActive ? '关闭放大镜' : '打开放大镜'}
+      >
+        <svg xmlns="http://www.w3.org/2000/svg" className="h-6 w-6" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
+        </svg>
+      </button>
+
       {/* 退出手动编辑模式按钮 */}
       <button
         onClick={onExitManualMode}
diff --git a/src/components/MagnifierSelectionOverlay.tsx b/src/components/MagnifierSelectionOverlay.tsx
new file mode 100644
index 0000000..836f479
--- /dev/null
+++ b/src/components/MagnifierSelectionOverlay.tsx
@@ -0,0 +1,264 @@
+import React, { useRef, useState, useCallback, useEffect } from 'react';
+
+interface SelectionArea {
+  startRow: number;
+  startCol: number;
+  endRow: number;
+  endCol: number;
+}
+
+interface MagnifierSelectionOverlayProps {
+  isActive: boolean;
+  canvasRef: React.RefObject<HTMLCanvasElement | null>;
+  gridDimensions: { N: number; M: number } | null;
+  cellSize: number;
+  onSelectionComplete: (area: SelectionArea) => void;
+}
+
+const MagnifierSelectionOverlay: React.FC<MagnifierSelectionOverlayProps> = ({
+  isActive,
+  canvasRef,
+  gridDimensions,
+  onSelectionComplete
+}) => {
+  const [isSelecting, setIsSelecting] = useState(false);
+  const [selectionStart, setSelectionStart] = useState<{ x: number; y: number } | null>(null);
+  const [selectionEnd, setSelectionEnd] = useState<{ x: number; y: number } | null>(null);
+  const overlayRef = useRef<HTMLDivElement>(null);
+  
+  // 滚动禁用状态
+  const scrollDisabledRef = useRef<boolean>(false);
+  const savedScrollPositionRef = useRef<number>(0);
+
+  // 禁用/启用页面滚动
+  const preventScrolling = useCallback((e: Event) => {
+    e.preventDefault();
+    e.stopPropagation();
+  }, []);
+
+  const disableScroll = useCallback(() => {
+    if (scrollDisabledRef.current) return; // 避免重复禁用
+    
+    // 保存当前滚动位置
+    savedScrollPositionRef.current = window.scrollY;
+    
+    // 设置CSS样式
+    document.body.style.overflow = 'hidden';
+    document.documentElement.style.overflow = 'hidden';
+    
+    // 阻止滚动事件（但不使用fixed定位，避免跳转问题）
+    document.addEventListener('wheel', preventScrolling, { passive: false });
+    document.addEventListener('touchmove', preventScrolling, { passive: false });
+    
+    scrollDisabledRef.current = true;
+  }, [preventScrolling]);
+  
+  const enableScroll = useCallback(() => {
+    if (!scrollDisabledRef.current) return; // 避免重复启用
+    
+    // 恢复CSS样式
+    document.body.style.overflow = '';
+    document.documentElement.style.overflow = '';
+    
+    // 移除事件监听器
+    document.removeEventListener('wheel', preventScrolling);
+    document.removeEventListener('touchmove', preventScrolling);
+    
+    scrollDisabledRef.current = false;
+    // 不再强制恢复滚动位置，让浏览器保持自然状态
+  }, [preventScrolling]);
+
+  // 获取画布相对坐标
+  const getCanvasCoordinates = useCallback((clientX: number, clientY: number) => {
+    if (!canvasRef.current) return null;
+    
+    const rect = canvasRef.current.getBoundingClientRect();
+    return {
+      x: clientX - rect.left,
+      y: clientY - rect.top
+    };
+  }, [canvasRef]);
+
+  // 将像素坐标转换为网格坐标
+  const pixelToGrid = useCallback((x: number, y: number) => {
+    if (!gridDimensions || !canvasRef.current) return null;
+    
+    const canvasWidth = canvasRef.current.width;
+    const canvasHeight = canvasRef.current.height;
+    const cellWidth = canvasWidth / gridDimensions.N;
+    const cellHeight = canvasHeight / gridDimensions.M;
+    
+    const col = Math.floor(x / cellWidth);
+    const row = Math.floor(y / cellHeight);
+    
+    return {
+      row: Math.max(0, Math.min(gridDimensions.M - 1, row)),
+      col: Math.max(0, Math.min(gridDimensions.N - 1, col))
+    };
+  }, [gridDimensions, canvasRef]);
+
+  // 处理鼠标事件
+  const handleMouseDown = useCallback((event: React.MouseEvent) => {
+    if (!isActive) return;
+    
+    const coords = getCanvasCoordinates(event.clientX, event.clientY);
+    if (!coords) return;
+    
+    setIsSelecting(true);
+    setSelectionStart(coords);
+    setSelectionEnd(coords);
+    disableScroll(); // 禁用滚动
+    event.preventDefault();
+  }, [isActive, getCanvasCoordinates, disableScroll]);
+
+  const handleMouseMove = useCallback((event: MouseEvent) => {
+    if (!isSelecting || !selectionStart) return;
+    
+    const coords = getCanvasCoordinates(event.clientX, event.clientY);
+    if (!coords) return;
+    
+    setSelectionEnd(coords);
+  }, [isSelecting, selectionStart, getCanvasCoordinates]);
+
+  const handleMouseUp = useCallback(() => {
+    if (!isSelecting || !selectionStart || !selectionEnd) {
+      enableScroll(); // 确保恢复滚动
+      return;
+    }
+    
+    const startGrid = pixelToGrid(selectionStart.x, selectionStart.y);
+    const endGrid = pixelToGrid(selectionEnd.x, selectionEnd.y);
+    
+    if (startGrid && endGrid) {
+      const area: SelectionArea = {
+        startRow: Math.min(startGrid.row, endGrid.row),
+        startCol: Math.min(startGrid.col, endGrid.col),
+        endRow: Math.max(startGrid.row, endGrid.row),
+        endCol: Math.max(startGrid.col, endGrid.col)
+      };
+      
+      onSelectionComplete(area);
+    }
+    
+    setIsSelecting(false);
+    setSelectionStart(null);
+    setSelectionEnd(null);
+    enableScroll(); // 恢复滚动
+  }, [isSelecting, selectionStart, selectionEnd, pixelToGrid, onSelectionComplete, enableScroll]);
+
+  // 处理触摸事件
+  const handleTouchStart = useCallback((event: React.TouchEvent) => {
+    if (!isActive) return;
+    
+    const touch = event.touches[0];
+    const coords = getCanvasCoordinates(touch.clientX, touch.clientY);
+    if (!coords) return;
+    
+    setIsSelecting(true);
+    setSelectionStart(coords);
+    setSelectionEnd(coords);
+    disableScroll(); // 禁用滚动
+    event.preventDefault();
+  }, [isActive, getCanvasCoordinates, disableScroll]);
+
+  const handleTouchMove = useCallback((event: TouchEvent) => {
+    if (!isSelecting || !selectionStart) return;
+    
+    const touch = event.touches[0];
+    const coords = getCanvasCoordinates(touch.clientX, touch.clientY);
+    if (!coords) return;
+    
+    setSelectionEnd(coords);
+    event.preventDefault();
+  }, [isSelecting, selectionStart, getCanvasCoordinates]);
+
+  const handleTouchEnd = useCallback(() => {
+    handleMouseUp();
+  }, [handleMouseUp]);
+
+  // 事件监听器
+  useEffect(() => {
+    if (isSelecting) {
+      document.addEventListener('mousemove', handleMouseMove);
+      document.addEventListener('mouseup', handleMouseUp);
+      document.addEventListener('touchmove', handleTouchMove);
+      document.addEventListener('touchend', handleTouchEnd);
+      
+      return () => {
+        document.removeEventListener('mousemove', handleMouseMove);
+        document.removeEventListener('mouseup', handleMouseUp);
+        document.removeEventListener('touchmove', handleTouchMove);
+        document.removeEventListener('touchend', handleTouchEnd);
+        enableScroll(); // 清理时恢复滚动
+      };
+    }
+  }, [isSelecting, handleMouseMove, handleMouseUp, handleTouchMove, handleTouchEnd, enableScroll]);
+
+  // 组件卸载时恢复滚动
+  useEffect(() => {
+    return () => {
+      enableScroll();
+    };
+  }, [enableScroll]);
+
+  // 当组件变为非活跃状态时恢复滚动
+  useEffect(() => {
+    if (!isActive) {
+      enableScroll();
+      setIsSelecting(false);
+      setSelectionStart(null);
+      setSelectionEnd(null);
+    }
+  }, [isActive, enableScroll]);
+
+  // 计算选择框的样式
+  const getSelectionStyle = useCallback(() => {
+    if (!selectionStart || !selectionEnd || !canvasRef.current) return {};
+    
+    const rect = canvasRef.current.getBoundingClientRect();
+    const minX = Math.min(selectionStart.x, selectionEnd.x);
+    const minY = Math.min(selectionStart.y, selectionEnd.y);
+    const maxX = Math.max(selectionStart.x, selectionEnd.x);
+    const maxY = Math.max(selectionStart.y, selectionEnd.y);
+    
+    return {
+      left: rect.left + minX,
+      top: rect.top + minY,
+      width: maxX - minX,
+      height: maxY - minY,
+      position: 'fixed' as const,
+      border: '2px solid #10b981',
+      backgroundColor: 'rgba(16, 185, 129, 0.1)',
+      pointerEvents: 'none' as const,
+      zIndex: 1000
+    };
+  }, [selectionStart, selectionEnd, canvasRef]);
+
+  if (!isActive) return null;
+
+  return (
+    <>
+      {/* 覆盖层 */}
+      <div
+        ref={overlayRef}
+        className="fixed inset-0 z-50"
+        style={{ 
+          cursor: 'crosshair',
+          pointerEvents: isActive ? 'auto' : 'none'
+        }}
+        onMouseDown={handleMouseDown}
+        onTouchStart={handleTouchStart}
+        onWheel={(e) => e.preventDefault()}
+        onTouchMove={(e) => e.preventDefault()}
+        onScroll={(e) => e.preventDefault()}
+      />
+      
+      {/* 选择框 */}
+      {isSelecting && selectionStart && selectionEnd && (
+        <div style={getSelectionStyle()} />
+      )}
+    </>
+  );
+};
+
+export default MagnifierSelectionOverlay; 
\ No newline at end of file
diff --git a/src/components/MagnifierTool.tsx b/src/components/MagnifierTool.tsx
new file mode 100644
index 0000000..bf4f073
--- /dev/null
+++ b/src/components/MagnifierTool.tsx
@@ -0,0 +1,281 @@
+import React, { useState, useRef, useEffect, useCallback } from 'react';
+import { MappedPixel } from '../utils/pixelation';
+import { getColorKeyByHex, ColorSystem } from '../utils/colorSystemUtils';
+
+interface MagnifierToolProps {
+  isActive: boolean;
+  onToggle: () => void;
+  mappedPixelData: MappedPixel[][] | null;
+  gridDimensions: { N: number; M: number } | null;
+  selectedColor: MappedPixel | null;
+  selectedColorSystem: ColorSystem;
+  onPixelEdit: (row: number, col: number, colorData: { key: string; color: string }) => void;
+  cellSize: number;
+  selectionArea: SelectionArea | null;
+  onClearSelection: () => void;
+}
+
+interface SelectionArea {
+  startRow: number;
+  startCol: number;
+  endRow: number;
+  endCol: number;
+}
+
+const MagnifierTool: React.FC<MagnifierToolProps> = ({
+  isActive,
+  onToggle,
+  mappedPixelData,
+  selectedColor,
+  selectedColorSystem,
+  onPixelEdit,
+  selectionArea,
+  onClearSelection
+}) => {
+  const [magnifierPosition, setMagnifierPosition] = useState<{ x: number; y: number }>({ x: 50, y: 50 });
+  const [isDragging, setIsDragging] = useState<boolean>(false);
+  
+  const magnifierRef = useRef<HTMLDivElement>(null);
+  const canvasRef = useRef<HTMLCanvasElement>(null);
+
+  // 计算选择区域的尺寸
+  const getSelectionDimensions = useCallback(() => {
+    if (!selectionArea) return { width: 0, height: 0 };
+    return {
+      width: Math.abs(selectionArea.endCol - selectionArea.startCol) + 1,
+      height: Math.abs(selectionArea.endRow - selectionArea.startRow) + 1
+    };
+  }, [selectionArea]);
+
+  // 渲染放大视图
+  const renderMagnifiedView = useCallback(() => {
+    if (!selectionArea || !mappedPixelData || !canvasRef.current) return;
+
+    const canvas = canvasRef.current;
+    const ctx = canvas.getContext('2d');
+    if (!ctx) return;
+
+    const { width, height } = getSelectionDimensions();
+    const magnifiedCellSize = 20; // 放大后每个像素的大小
+    
+    // 设置画布的实际尺寸
+    canvas.width = width * magnifiedCellSize;
+    canvas.height = height * magnifiedCellSize;
+    
+    // 设置画布的显示尺寸，确保不会太大
+    const maxDisplayWidth = 400;
+    const maxDisplayHeight = 400;
+    const displayWidth = Math.min(canvas.width, maxDisplayWidth);
+    const displayHeight = Math.min(canvas.height, maxDisplayHeight);
+    
+    canvas.style.width = `${displayWidth}px`;
+    canvas.style.height = `${displayHeight}px`;
+
+    // 清空画布
+    ctx.clearRect(0, 0, canvas.width, canvas.height);
+
+    // 渲染放大的像素
+    const startRow = Math.min(selectionArea.startRow, selectionArea.endRow);
+    const endRow = Math.max(selectionArea.startRow, selectionArea.endRow);
+    const startCol = Math.min(selectionArea.startCol, selectionArea.endCol);
+    const endCol = Math.max(selectionArea.startCol, selectionArea.endCol);
+
+    for (let row = startRow; row <= endRow; row++) {
+      for (let col = startCol; col <= endCol; col++) {
+        if (row >= 0 && row < mappedPixelData.length && col >= 0 && col < mappedPixelData[0].length) {
+          const pixel = mappedPixelData[row][col];
+          const canvasRow = row - startRow;
+          const canvasCol = col - startCol;
+          
+          // 绘制像素
+          ctx.fillStyle = pixel.color;
+          ctx.fillRect(
+            canvasCol * magnifiedCellSize,
+            canvasRow * magnifiedCellSize,
+            magnifiedCellSize,
+            magnifiedCellSize
+          );
+
+          // 绘制网格线
+          ctx.strokeStyle = '#e0e0e0';
+          ctx.lineWidth = 1;
+          ctx.strokeRect(
+            canvasCol * magnifiedCellSize,
+            canvasRow * magnifiedCellSize,
+            magnifiedCellSize,
+            magnifiedCellSize
+          );
+        }
+      }
+    }
+  }, [selectionArea, mappedPixelData, getSelectionDimensions]);
+
+  // 处理放大视图点击
+  const handleMagnifiedClick = useCallback((event: React.MouseEvent<HTMLCanvasElement>) => {
+    if (!selectionArea || !mappedPixelData || !selectedColor || !canvasRef.current) return;
+
+    const canvas = canvasRef.current;
+    const rect = canvas.getBoundingClientRect();
+    
+    // 获取点击在画布上的相对位置（考虑缩放）
+    const scaleX = canvas.width / rect.width;
+    const scaleY = canvas.height / rect.height;
+    
+    const x = (event.clientX - rect.left) * scaleX;
+    const y = (event.clientY - rect.top) * scaleY;
+
+    const magnifiedCellSize = 20;
+    const clickedCol = Math.floor(x / magnifiedCellSize);
+    const clickedRow = Math.floor(y / magnifiedCellSize);
+
+    const startRow = Math.min(selectionArea.startRow, selectionArea.endRow);
+    const startCol = Math.min(selectionArea.startCol, selectionArea.endCol);
+    
+    const actualRow = startRow + clickedRow;
+    const actualCol = startCol + clickedCol;
+
+    // 确保点击在有效范围内
+    if (actualRow >= 0 && actualRow < mappedPixelData.length && 
+        actualCol >= 0 && actualCol < mappedPixelData[0].length) {
+      onPixelEdit(actualRow, actualCol, selectedColor);
+    }
+  }, [selectionArea, mappedPixelData, selectedColor, onPixelEdit]);
+
+  // 处理拖拽移动
+  const handleTitleBarMouseDown = useCallback((event: React.MouseEvent) => {
+    // 只有点击在标题栏区域且不是按钮时才开始拖拽
+    const target = event.target as HTMLElement;
+    if (target.tagName === 'BUTTON' || target.closest('button')) {
+      return; // 点击按钮时不拖拽
+    }
+    
+    setIsDragging(true);
+    event.preventDefault();
+  }, []);
+
+  const handleMouseMove = useCallback((event: MouseEvent) => {
+    if (isDragging && magnifierRef.current) {
+      const rect = magnifierRef.current.getBoundingClientRect();
+      const newX = Math.max(0, Math.min(window.innerWidth - rect.width, event.clientX - rect.width / 2));
+      const newY = Math.max(0, Math.min(window.innerHeight - rect.height, event.clientY - rect.height / 2));
+      setMagnifierPosition({ x: newX, y: newY });
+    }
+  }, [isDragging]);
+
+  const handleMouseUp = useCallback(() => {
+    setIsDragging(false);
+  }, []);
+
+  useEffect(() => {
+    if (isDragging) {
+      document.addEventListener('mousemove', handleMouseMove);
+      document.addEventListener('mouseup', handleMouseUp);
+      return () => {
+        document.removeEventListener('mousemove', handleMouseMove);
+        document.removeEventListener('mouseup', handleMouseUp);
+      };
+    }
+  }, [isDragging, handleMouseMove, handleMouseUp]);
+
+  // 重新渲染放大视图
+  useEffect(() => {
+    renderMagnifiedView();
+  }, [renderMagnifiedView]);
+
+  if (!isActive) return null;
+
+  return (
+    <>
+      {/* 选择区域提示 */}
+      {!selectionArea && (
+        <div className="fixed top-4 left-1/2 transform -translate-x-1/2 bg-blue-500 text-white px-4 py-2 rounded-lg shadow-lg z-50">
+          <div className="flex items-center gap-2">
+            <svg xmlns="http://www.w3.org/2000/svg" className="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
+            </svg>
+            <span>在画布上拖拽选择要放大的区域</span>
+          </div>
+        </div>
+      )}
+
+      {/* 放大视图窗口 */}
+      {selectionArea && (
+        <div
+          ref={magnifierRef}
+          className="fixed bg-white dark:bg-gray-800 rounded-xl shadow-2xl border border-gray-200 dark:border-gray-600 z-50 select-none"
+          style={{
+            left: magnifierPosition.x,
+            top: magnifierPosition.y,
+            maxWidth: '500px',
+            maxHeight: '500px'
+          }}
+        >
+          {/* 标题栏 */}
+          <div 
+            className="flex items-center justify-between p-3 bg-gradient-to-r from-green-500 to-teal-500 text-white rounded-t-xl cursor-move"
+            onMouseDown={handleTitleBarMouseDown}
+          >
+            <div className="flex items-center gap-2">
+              <svg xmlns="http://www.w3.org/2000/svg" className="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
+              </svg>
+              <span className="text-sm font-medium">放大镜 ({getSelectionDimensions().width}×{getSelectionDimensions().height})</span>
+            </div>
+            
+            <div className="flex items-center gap-2">
+              {/* 重新选择按钮 */}
+              <button
+                onClick={onClearSelection}
+                className="p-1 hover:bg-white/20 rounded transition-colors"
+                title="重新选择区域"
+              >
+                <svg xmlns="http://www.w3.org/2000/svg" className="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15" />
+                </svg>
+              </button>
+              
+              {/* 关闭按钮 */}
+              <button
+                onClick={onToggle}
+                className="p-1 hover:bg-white/20 rounded transition-colors"
+                title="关闭放大镜"
+              >
+                <svg xmlns="http://www.w3.org/2000/svg" className="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
+                </svg>
+              </button>
+            </div>
+          </div>
+
+          {/* 放大视图内容 */}
+          <div className="p-3">
+            <div className="border border-gray-300 dark:border-gray-600 rounded-lg overflow-hidden">
+              <canvas
+                ref={canvasRef}
+                onClick={handleMagnifiedClick}
+                className="cursor-crosshair block"
+              />
+            </div>
+            
+            {/* 当前选中颜色信息 */}
+            {selectedColor && (
+              <div className="mt-2 p-2 bg-gray-100 dark:bg-gray-700 rounded-lg">
+                <div className="flex items-center gap-2 text-xs">
+                  <div
+                    className="w-4 h-4 rounded border border-gray-300 dark:border-gray-500"
+                    style={{ backgroundColor: selectedColor.color }}
+                  ></div>
+                  <span className="text-gray-700 dark:text-gray-300">
+                    当前: {getColorKeyByHex(selectedColor.color, selectedColorSystem)}
+                  </span>
+                </div>
+              </div>
+            )}
+          </div>
+        </div>
+      )}
+    </>
+  );
+};
+
+export default MagnifierTool; 
\ No newline at end of file