ueblueprint/js/input/Paste.js

import GraphNode from "../graph/GraphNode"
import ObjectSerializer from "../serialization/ObjectSerializer"
import Context from "./Context"

export default class Paste extends Context {

    constructor(target, blueprint, options = {}) {
        options.wantsFocusCallback = true
        super(target, blueprint, options)
        this.serializer = new ObjectSerializer()
        let self = this
        this.pasteHandle = e => self.pasted(e.clipboardData.getData("Text"))
    }

    blueprintFocused() {
        document.body.addEventListener("paste", this.pasteHandle)
    }

    blueprintUnfocused() {
        document.body.removeEventListener("paste", this.pasteHandle)
    }

    pasted(value) {
        let top = Number.MAX_SAFE_INTEGER
        let left = Number.MAX_SAFE_INTEGER
        let nodes = this.serializer.readMultiple(value).map(entity => {
            let node = new GraphNode(entity)
            top = Math.min(top, node.location[1])
            left = Math.min(left, node.location[0])
            return node
        })
        let mousePosition = this.blueprint.entity.mousePosition
        nodes.forEach(node => {
            const locationOffset = [
                mousePosition[0] - left,
                mousePosition[1] - top
            ]
            node.addLocation(locationOffset)
        })
        this.blueprint.addNode(...nodes)
    }
}