Vue3.0利用vue-grid-layout插件實現拖拽佈局

npm i vue-grid-layout --save

const layout = ref<LayoutItem[]>([
      { x: 0, y: 0, w: 1, h: 1, i: 0 },
      { x: 1, y: 0, w: 2, h: 1, i: 1 },
      { x: 0, y: 1, w: 2, h: 1, i: 2 },
      { x: 0, y: 2, w: 3, h: 1, i: 3 },
      { x: 2, y: 1, w: 1, h: 1, i: 4 },
    ]);

    <grid-layout
      :layout="layout"
      :col-num="3"
      :row-height="240"
      :is-draggable="true"
      :is-resizable="true"
      :is-mirrored="false"
      :maxRows="3"
      :vertical-compact="true"
      :margin="[10, 10]"
      :use-css-transforms="true"
    >
      <grid-item
        v-for="item in layout"
        :x="item.x"
        :y="item.y"
        :w="item.w"
        :h="item.h"
        :i="item.i"
        :key="item.i"
        @moved="onItemMoved"
      >{{ item.i }}</grid-item>
    </grid-layout>

import { LayoutItem } from '../types/index';
import { cloneDeep } from 'lodash'
/**
 * 校驗佈局是否合法
 * 1.深拷貝數組，避免污染原數組
 * 2.拿到y的最大值 用於遍歷
 * 3.拿到每個y的分數組 按照x升序排列
 * 4.如果數組長度為1判斷w是否等於最大x
 * 5.如果數組長度不為1 遍歷數組 判斷每個元素的w是否等於下一個元素的x 累加w判斷總和是否等於最大x
 * 6.如果合法則返回false
 * @param list 
 * @returns 
 */
export const verifyLayout = (list: Array<LayoutItem>): boolean => {
    let yList = list.map(item => { return item.y });
    yList = yList.sort((a, b) => { return a - b });
    console.log(list);
    const newArr = cloneDeep(list);
    let flag = false;
    const maxY = yList[yList.length - 1];
    const maxX = 3;
    console.log(maxY);
    for (let i = 0; i <= maxY; i++) {
        let arr = newArr.filter((item: LayoutItem) => {
            return item.y === i;
        });
        console.log(arr, arr.length);
        if (arr && arr.length > 1) {
            console.log('多個個-------------------', i);
            let calValue = 0;
            arr = arr.sort((a: LayoutItem, b: LayoutItem) => { return a.x - b.x })
            arr.forEach((childItem: LayoutItem, index: number) => {
                calValue += childItem.w;
                console.log('calValue--------------', calValue, index);
                if (index !== arr.length - 1 && calValue !== arr[index + 1].x) {
                    flag = true;
                }
                if (index === arr.length - 1 && calValue !== maxX) {
                    flag = true;
                }
            })
        } else {
            console.log('隻有一個-------------------', i);
            if (arr[0].w !== maxX) {
                flag = true
            }
        }
    }
    console.log(flag);
    return flag;
}

    /**
     * 拖拽完成事件
     * 1.將之前的數據存儲到history數據中
     * 2.然後再將移動完成的數據存儲到nowlayout數據中
     */
    const onItemMoved = () => {
      console.log('moved--------------------')
      historyDataList.value.push(cloneDeep(nowLayoutData.value));
      nowLayoutData.value = cloneDeep(layout.value);
      // const flag = verifyLayout(layout.value);
      // if (flag) {
      //   goBack()
      // }
    };
    const goBack = () => {
      console.log(historyDataList.value[historyDataList.value.length - 1]);
      layout.value = historyDataList.value[historyDataList.value.length - 1];
      nowLayoutData.value = cloneDeep(layout.value);
      historyDataList.value.pop();
    }