jtBaseApp/node_modules/element-plus/es/hooks/use-draggable/index.mjs

import { onMounted, watchEffect, onBeforeUnmount } from 'vue';
import '../../utils/index.mjs';
import { addUnit } from '../../utils/dom/style.mjs';

const useDraggable = (targetRef, dragRef, draggable) => {
  let transform = {
    offsetX: 0,
    offsetY: 0
  };
  const onMousedown = (e) => {
    const downX = e.clientX;
    const downY = e.clientY;
    const { offsetX, offsetY } = transform;
    const targetRect = targetRef.value.getBoundingClientRect();
    const targetLeft = targetRect.left;
    const targetTop = targetRect.top;
    const targetWidth = targetRect.width;
    const targetHeight = targetRect.height;
    const clientWidth = document.documentElement.clientWidth;
    const clientHeight = document.documentElement.clientHeight;
    const minLeft = -targetLeft + offsetX;
    const minTop = -targetTop + offsetY;
    const maxLeft = clientWidth - targetLeft - targetWidth + offsetX;
    const maxTop = clientHeight - targetTop - targetHeight + offsetY;
    const onMousemove = (e2) => {
      const moveX = Math.min(Math.max(offsetX + e2.clientX - downX, minLeft), maxLeft);
      const moveY = Math.min(Math.max(offsetY + e2.clientY - downY, minTop), maxTop);
      transform = {
        offsetX: moveX,
        offsetY: moveY
      };
      targetRef.value.style.transform = `translate(${addUnit(moveX)}, ${addUnit(moveY)})`;
    };
    const onMouseup = () => {
      document.removeEventListener("mousemove", onMousemove);
      document.removeEventListener("mouseup", onMouseup);
    };
    document.addEventListener("mousemove", onMousemove);
    document.addEventListener("mouseup", onMouseup);
  };
  const onDraggable = () => {
    if (dragRef.value && targetRef.value) {
      dragRef.value.addEventListener("mousedown", onMousedown);
    }
  };
  const offDraggable = () => {
    if (dragRef.value && targetRef.value) {
      dragRef.value.removeEventListener("mousedown", onMousedown);
    }
  };
  onMounted(() => {
    watchEffect(() => {
      if (draggable.value) {
        onDraggable();
      } else {
        offDraggable();
      }
    });
  });
  onBeforeUnmount(() => {
    offDraggable();
  });
};

export { useDraggable };
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