vue 组件封装——可自由拖拽移动的盒子

<template>
  <div
    ref="box_Ref"
    class="box"
    @mousedown="moveStart"
    @mousemove="moving"
    @mouseup="moveEnd"
    :style="{
      width: (nodeInfo.width || 40) + 'px',
      height: (nodeInfo.height || 60) + 'px',
      left: (nodeInfo.x || 0) + 'px',
      top: (nodeInfo.y || 0) + 'px',
      backgroundColor: nodeInfo.color || 'black',
      zIndex: zIndex,
    }"
  ></div>
</template>

<script>
export default {
  props: {
    nodeInfo: Object,
  },
  data() {
    return {
      zIndex: "auto",
      // 移动开始时，鼠标的x坐标
      moveStart_mouseX: null,
      // 移动开始时，鼠标的y坐标
      moveStart_mouseY: null,
      ifMove: false,
      originNodeInfo: null,
    };
  },

  methods: {
    // 移动开始
    moveStart(e) {
      this.moveStart_mouseX = e.clientX;
      this.moveStart_mouseY = e.clientY;
      this.ifMove = true;
      this.originNodeInfo = JSON.parse(JSON.stringify(this.nodeInfo));
      //   移动时，临时提升元素至顶层，避免因元素遮挡而无法继续移动
      this.zIndex = 99999;
    },
    // 移动中
    moving(e) {
      if (this.ifMove) {
        let moveing_mouseX = e.clientX;
        let moveing_mouseY = e.clientY;
        let xChange = moveing_mouseX - this.moveStart_mouseX;
        let yChange = moveing_mouseY - this.moveStart_mouseY;
        this.$emit("moved", {
          newX: this.originNodeInfo.x + xChange,
          newY: this.originNodeInfo.y + yChange,
        });
      }
    },
    // 移动结束
    moveEnd() {
      this.ifMove = false;
      this.moveStart_mouseX = null;
      this.moveStart_mouseY = null;
      this.originNodeInfo = null;
      this.zIndex = "auto";
    },
  },
};
</script>

<style scoped>
.box {
  position: absolute;
  cursor: move;
}
</style>

<template>
  <div>
    <SuperBox @moved="moved($event, node1)" :nodeInfo="node1" />
    <SuperBox @moved="moved($event, node2)" :nodeInfo="node2" />
  </div>
</template>

<script>
import SuperBox from "./superBox.vue";
export default {
  components: {
    SuperBox,
  },
  data() {
    return {
      node1: {
        x: 100,
        y: 10,
        color: "red",
      },

      node2: {
        x: 400,
        y: 10,
        color: "blue",
      },
    };
  },

  methods: {
    moved(movedInfo, nodeInfo) {
      // < 0 时置为0，避免元素移出浏览器窗口
      nodeInfo.x = movedInfo.newX < 0 ? 0 : movedInfo.newX;
      nodeInfo.y = movedInfo.newY < 0 ? 0 : movedInfo.newY;
    },
  },
};
</script>