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src/components/Canvas/DepthCanvas/manager/AISelectboxToolManager.ts

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+import { fabric } from 'fabric-with-all'
+/** 智能框选工具管理器 */
+export class AISelectboxToolManager {
+	// 管理器	
+	canvasManager: any
+	stateManager: any
+	layerManager: any
+
+	isDragging: boolean = false
+	startX: number = 0
+	startY: number = 0
+	demoObject: any
+	constructor(options) {
+		this.canvasManager = options.canvasManager
+		this.stateManager = options.stateManager
+		this.layerManager = options.layerManager
+	}
+	mouseDownEvent(e) {
+		this.isDragging = true
+		this.startX = e.absolutePointer.x
+		this.startY = e.absolutePointer.y
+		const rect = new fabric.Rect({
+			left: this.startX,
+			top: this.startY,
+			width: 0,
+			height: 0,
+			fill: 'transparent',
+			stroke: '#000',
+			strokeWidth: 1,
+			evented: false,
+		})
+		this.demoObject = rect
+		this.canvasManager.canvas.add(rect)
+		this.canvasManager.canvas.renderAll()
+	}
+	mouseMoveEvent(e) {
+		if (!this.isDragging) return;
+		var width = e.absolutePointer.x - this.startX
+		var height = e.absolutePointer.y - this.startY
+		var left = this.startX
+		var top = this.startY
+		if(width < 0) {
+			left += width
+			width = -width
+		}
+		if(height < 0) {
+			top += height
+			height = -height
+		}
+		this.demoObject.set({ width, height, left, top })
+		this.canvasManager.canvas.renderAll()
+	}
+	mouseUpEvent(e) {
+		if (!this.isDragging) return;
+		this.isDragging = false;
+		const object = this.demoObject.toJSON("evented")
+		if (object.width === 0) object.width = 100
+		if (object.height === 0) object.height = 100
+		// console.log(object)
+		this.canvasManager.canvas.remove(this.demoObject)
+		this.canvasManager.canvas.renderAll()
+
+	}
+	dispose() { }
+}