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| 1 | +/* |
| 2 | + * @Author: 秦少卫 |
| 3 | + * @Date: 2024-07-06 12:34:00 |
| 4 | + * @LastEditors: 秦少卫 |
| 5 | + * @LastEditTime: 2024-07-06 17:11:03 |
| 6 | + * @Description: 基础元素类型添加 |
| 7 | + */ |
| 8 | + |
| 9 | +import { fabric } from 'fabric'; |
| 10 | +import type Editor from '../Editor'; |
| 11 | +import { v4 as uuid } from 'uuid'; |
| 12 | + |
| 13 | +export default class AddBaseTypePlugin implements IPluginTempl { |
| 14 | + static pluginName = 'AddBaseTypePlugin'; |
| 15 | + static apis = ['addBaseType', 'createImgByElement']; |
| 16 | + constructor(public canvas: fabric.Canvas, public editor: Editor) { |
| 17 | + this.editor = editor; |
| 18 | + this.canvas = canvas; |
| 19 | + } |
| 20 | + |
| 21 | + addBaseType( |
| 22 | + item: fabric.Object, |
| 23 | + optons?: { |
| 24 | + event: DragEvent; |
| 25 | + scale: boolean; |
| 26 | + center: boolean; |
| 27 | + } |
| 28 | + ) { |
| 29 | + const { event = false, scale = false, center = true } = optons || {}; |
| 30 | + item.set({ |
| 31 | + id: uuid(), |
| 32 | + }); |
| 33 | + scale && this._toScale(item); |
| 34 | + event && this._toEvent(item, event); |
| 35 | + this.canvas.add(item); |
| 36 | + if (!event && center) { |
| 37 | + this._toCenter(item); |
| 38 | + } |
| 39 | + this.canvas.setActiveObject(item); |
| 40 | + this.canvas.renderAll(); |
| 41 | + } |
| 42 | + |
| 43 | + _toEvent(item: fabric.Object, event: DragEvent) { |
| 44 | + const { left, top } = this.canvas.getSelectionElement().getBoundingClientRect(); |
| 45 | + if (event.x < left || event.y < top || item.width === undefined) return; |
| 46 | + const point = { |
| 47 | + x: event.x - left, |
| 48 | + y: event.y - top, |
| 49 | + }; |
| 50 | + const pointerVpt = this.canvas.restorePointerVpt(point); |
| 51 | + item.set({ |
| 52 | + left: pointerVpt.x, |
| 53 | + top: pointerVpt.y, |
| 54 | + }); |
| 55 | + } |
| 56 | + |
| 57 | + _toCenter(item: fabric.Object) { |
| 58 | + this.canvas.setActiveObject(item); |
| 59 | + this.editor.position('center'); |
| 60 | + } |
| 61 | + |
| 62 | + _toScale(item: fabric.Object) { |
| 63 | + const { width } = this.editor.getWorkspase(); |
| 64 | + item.scaleToWidth(width / 2); |
| 65 | + } |
| 66 | + |
| 67 | + createImgByElement(target: HTMLImageElement) { |
| 68 | + return new Promise((resolve) => { |
| 69 | + const imgType = this.getImageExtension(target.src); |
| 70 | + if (imgType === 'svg') { |
| 71 | + fabric.loadSVGFromURL(target.src, (objects) => { |
| 72 | + const item = fabric.util.groupSVGElements(objects, { |
| 73 | + shadow: '', |
| 74 | + fontFamily: 'arial', |
| 75 | + name: 'svg元素', |
| 76 | + }); |
| 77 | + resolve(item); |
| 78 | + }); |
| 79 | + } else { |
| 80 | + fabric.Image.fromURL( |
| 81 | + target.src, |
| 82 | + (imgEl) => { |
| 83 | + resolve(imgEl); |
| 84 | + }, |
| 85 | + { crossOrigin: 'anonymous' } |
| 86 | + ); |
| 87 | + } |
| 88 | + }); |
| 89 | + } |
| 90 | + |
| 91 | + getImageExtension(imageUrl: string) { |
| 92 | + const pathParts = imageUrl.split('/'); |
| 93 | + const filename = pathParts[pathParts.length - 1]; |
| 94 | + const fileParts = filename.split('.'); |
| 95 | + return fileParts[fileParts.length - 1]; |
| 96 | + } |
| 97 | + |
| 98 | + destroy() { |
| 99 | + console.log('pluginDestroy'); |
| 100 | + } |
| 101 | +} |
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