基于Jeecgboot3.6.3的vue3版本的流程中仿钉钉流程的鼠标拖动功能支持

因为这个项目license问题无法开源，更多技术支持与服务请加入我的知识星球。

 1、因为原先仿钉钉流程里不能进行鼠标拖动来查看流程，所以根据作者提供的信息进行修改，在hooks下增加下面文件useDraggableScroll.ts

import { ref, onMounted, onBeforeUnmount, type Ref } from 'vue'

export function useDraggableScroll(containerRef: Ref<HTMLElement | null>) {
  const isDragging = ref(false);
  let startX: number, startY: number;
  let scrollLeft: number, scrollTop: number;

  const onMouseDown = (e: MouseEvent) => {
    if (!containerRef.value) return;
    isDragging.value = true;
    startX = e.pageX;
    startY = e.pageY;
    scrollLeft = containerRef.value.scrollLeft;
    scrollTop = containerRef.value.scrollTop;
    document.addEventListener('mousemove', onMouseMove);
    document.addEventListener('mouseup', onMouseUp);
  };

  const onMouseMove = (e: MouseEvent) => {
    if (!isDragging.value || !containerRef.value) return;
    const deltaX = e.pageX - startX;
    const deltaY = e.pageY - startY;
    containerRef.value.scrollLeft = scrollLeft - deltaX;
    containerRef.value.scrollTop = scrollTop - deltaY;
  };

  const onMouseUp = () => {
    isDragging.value = false;
    document.removeEventListener('mousemove', onMouseMove);
    document.removeEventListener('mouseup', onMouseUp);
  };

  onMounted(() => {
    containerRef.value?.addEventListener('mousedown', onMouseDown);
  });

  onBeforeUnmount(() => {
    containerRef.value?.removeEventListener('mousedown', onMouseDown);
  });

  return {
    isDragging,
  };
}

2、在lowflow\flowDesign\index修改增加相应的操作

import { useDraggableScroll } from '@/views/lowflow/hooks/useDraggableScroll'

const designerContainerRef = ref<HTMLElement | null>(null)
useDraggableScroll(designerContainerRef);

<div class="designer-container cursor-default active:cursor-grabbing" ref="designerContainerRef">

designer-container {
  --flow-bg-color: v-bind(bgColor);
  position: relative;
  display: flex;
  flex-direction: row;
  height: 100%;
  width: 100%;
  overflow: auto;
  background-color: var(--flow-bg-color);
  padding: 80px 0;

3、ModelDesigner.vue的样式做下面的跳转，以便满足拖动等界面要求

.el-dialog.is-fullscreen.ddDialog {
      overflow: hidden;
    }
    .ddDialog .el-dialog__body {
      height: 95%;
      overflow: auto;
    }

4、效果图