| 1 | /** |
| 2 | * BrushCanvas - 画笔画布组件 |
| 3 | * 双 Canvas 架构：底层显示原图，顶层用于绘制 |
| 4 | */ |
| 5 | |
| 6 | 'use client' |
| 7 | |
| 8 | import type { UseBrushEditorReturn } from './useBrushEditor' |
| 9 | import type { UseCropEditorReturn } from './useCropEditor' |
| 10 | import { Loader2 } from 'lucide-react' |
| 11 | import { memo, useEffect, useState } from 'react' |
| 12 | import { cn } from '@/utils/className' |
| 13 | import { CropOverlay } from './CropOverlay' |
| 14 | |
| 15 | export interface BrushCanvasProps { |
| 16 | /** useBrushEditor 返回的状态和方法 */ |
| 17 | editor: UseBrushEditorReturn |
| 18 | /** 裁剪编辑器 */ |
| 19 | cropEditor?: UseCropEditorReturn |
| 20 | /** 容器最大宽度 */ |
| 21 | maxWidth?: number |
| 22 | /** 容器最大高度 */ |
| 23 | maxHeight?: number |
| 24 | /** 自定义类名 */ |
| 25 | className?: string |
| 26 | } |
| 27 | |
| 28 | export const BrushCanvas = memo( |
| 29 | ({ editor, cropEditor, maxWidth = 800, maxHeight = 600, className }: BrushCanvasProps) => { |
| 30 | const { imageCanvasRef, drawCanvasRef, imageLoaded, loadImage, drawHandlers, imageSize } |
| 31 | = editor |
| 32 | |
| 33 | // 计算显示尺寸（保持宽高比） |
| 34 | const [displaySize, setDisplaySize] = useState({ width: 0, height: 0 }) |
| 35 | |
| 36 | useEffect(() => { |
| 37 | loadImage() |
| 38 | }, [loadImage]) |
| 39 | |
| 40 | useEffect(() => { |
| 41 | if (imageLoaded && imageSize.width > 0 && imageSize.height > 0) { |
| 42 | const aspectRatio = imageSize.width / imageSize.height |
| 43 | |
| 44 | let width = imageSize.width |
| 45 | let height = imageSize.height |
| 46 | |
| 47 | // 按最大宽度缩放 |
| 48 | if (width > maxWidth) { |
| 49 | width = maxWidth |
| 50 | height = width / aspectRatio |
| 51 | } |
| 52 | |
| 53 | // 按最大高度缩放 |
| 54 | if (height > maxHeight) { |
| 55 | height = maxHeight |
| 56 | width = height * aspectRatio |
| 57 | } |
| 58 | |
| 59 | setDisplaySize({ width, height }) |
| 60 | } |
| 61 | }, [imageLoaded, imageSize, maxWidth, maxHeight]) |
| 62 | |
| 63 | const isCropping = cropEditor?.isCropping |
| 64 | |
| 65 | return ( |
| 66 | <div |
| 67 | className={cn( |
| 68 | 'relative flex items-center justify-center bg-black/20 rounded-lg overflow-hidden', |
| 69 | className, |
| 70 | )} |
| 71 | style={{ |
| 72 | minHeight: 200, |
| 73 | width: displaySize.width || '100%', |
| 74 | height: displaySize.height || 'auto', |
| 75 | }} |
| 76 | > |
| 77 | {/* 加载中 */} |
| 78 | {!imageLoaded && ( |
| 79 | <div className="absolute inset-0 flex items-center justify-center z-10"> |
| 80 | <Loader2 className="w-10 h-10 text-white/60 animate-spin" /> |
| 81 | </div> |
| 82 | )} |
| 83 | |
| 84 | {/* 底层 Canvas：显示原图 */} |
| 85 | <canvas |
| 86 | ref={imageCanvasRef} |
| 87 | className="absolute inset-0 w-full h-full" |
| 88 | style={{ |
| 89 | opacity: imageLoaded ? 1 : 0, |
| 90 | pointerEvents: 'none', |
| 91 | }} |
| 92 | /> |
| 93 | |
| 94 | {/* 顶层 Canvas：绘制层 */} |
| 95 | <canvas |
| 96 | ref={drawCanvasRef} |
| 97 | className="absolute inset-0 w-full h-full cursor-crosshair" |
| 98 | style={{ |
| 99 | opacity: imageLoaded ? 1 : 0, |
| 100 | touchAction: 'none', |
| 101 | pointerEvents: isCropping ? 'none' : 'auto', |
| 102 | }} |
| 103 | {...drawHandlers} |
| 104 | /> |
| 105 | |
| 106 | {/* 裁剪覆盖层 */} |
| 107 | {isCropping && cropEditor && displaySize.width > 0 && ( |
| 108 | <CropOverlay |
| 109 | cropRect={cropEditor.cropRect} |
| 110 | onCropRectChange={cropEditor.setCropRect} |
| 111 | canvasSize={imageSize} |
| 112 | displaySize={displaySize} |
| 113 | aspectRatio={cropEditor.aspectRatio} |
| 114 | /> |
| 115 | )} |
| 116 | </div> |
| 117 | ) |
| 118 | }, |
| 119 | ) |
| 120 | |
| 121 | export default BrushCanvas |
| 122 |