Vue in der Praxis: Komponentenentwicklung per Drag & Drop

<template>
  <div class="drag-box">
    <div class="drag-handle" @mousedown="handleMouseDown">拖拽元素</div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      isDragging: false,
      dragStartX: 0,
      dragStartY: 0,
      dragOffsetX: 0,
      dragOffsetY: 0,
    };
  },
  methods: {
    handleMouseDown(event) {
      this.isDragging = true;

      const rect = event.target.getBoundingClientRect();
      this.dragStartX = event.clientX;
      this.dragStartY = event.clientY;
      this.dragOffsetX = event.clientX - rect.left;
      this.dragOffsetY = event.clientY - rect.top;

      document.addEventListener("mousemove", this.handleMouseMove);
      document.addEventListener("mouseup", this.handleMouseUp);
    },
    handleMouseMove(event) {
      if (this.isDragging) {
        const box = this.$el.getBoundingClientRect();
        const x = event.clientX - this.dragStartX;
        const y = event.clientY - this.dragStartY;

        this.$el.style.transform = `translate(${x}px, ${y}px)`;
      }
    },
    handleMouseUp(event) {
      this.isDragging = false;
      this.$el.style.transition = "all 0.3s ease-out";
      this.$el.style.transform = `translate(0, 0)`;
      setTimeout(() => {
        this.$el.style.transition = "";
      }, 300);

      document.removeEventListener("mousemove", this.handleMouseMove);
      document.removeEventListener("mouseup", this.handleMouseUp);
    },
  },
};
</script>

<template>
  <div class="drag-demo">
    <DragBox class="drag-box">
      <div class="drag-handle" @mousedown="handleMouseDown">
        拖拽元素
      </div>
    </DragBox>
  </div>
</template>

<script>
import DragBox from "./DragBox.vue";

export default {
  components: {
    DragBox,
  },
  methods: {
    handleMouseDown(event) {
      //...
    },
  },
};
</script>

<style>
.drag-box {
  width: 300px;
  height: 300px;
  border: 1px solid gray;
  position: relative;
}

.drag-handle {
  width: 100px;
  height: 50px;
  background-color: red;
  color: white;
  text-align: center;
  line-height: 50px;
  cursor: move;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
</style>