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

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

const useDraggable = (targetRef, dragRef, draggable, overflow) => {
  const transform = {
    offsetX: 0,
    offsetY: 0
  };
  const adjustPosition = (moveX, moveY) => {
    if (targetRef.value) {
      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;
      if (!(overflow == null ? void 0 : overflow.value)) {
        moveX = Math.min(Math.max(moveX, minLeft), maxLeft);
        moveY = Math.min(Math.max(moveY, minTop), maxTop);
      }
      transform.offsetX = moveX;
      transform.offsetY = moveY;
      targetRef.value.style.transform = `translate(${addUnit(moveX)}, ${addUnit(moveY)})`;
    }
  };
  const onMousedown = (e) => {
    const downX = e.clientX;
    const downY = e.clientY;
    const { offsetX, offsetY } = transform;
    const onMousemove = (e2) => {
      const moveX = offsetX + e2.clientX - downX;
      const moveY = offsetY + e2.clientY - downY;
      adjustPosition(moveX, 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);
      window.addEventListener("resize", updatePosition);
    }
  };
  const offDraggable = () => {
    if (dragRef.value && targetRef.value) {
      dragRef.value.removeEventListener("mousedown", onMousedown);
      window.removeEventListener("resize", updatePosition);
    }
  };
  const resetPosition = () => {
    transform.offsetX = 0;
    transform.offsetY = 0;
    if (targetRef.value) {
      targetRef.value.style.transform = "";
    }
  };
  const updatePosition = () => {
    const { offsetX, offsetY } = transform;
    adjustPosition(offsetX, offsetY);
  };
  onMounted(() => {
    watchEffect(() => {
      if (draggable.value) {
        onDraggable();
      } else {
        offDraggable();
      }
    });
  });
  onBeforeUnmount(() => {
    offDraggable();
  });
  return {
    resetPosition,
    updatePosition
  };
};

export { useDraggable };
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