C++窗口内置的滚动条绘制方法?

2026-02-12
大家觉得应该怎么绘制呢?
  PS:不能通过新建窗口替换的方法
  case WM_MOVE:
  case WM_PAINT:
  case WM_NCPAINT:
  case WM_NCACTIVATE:
  case WM_NOTIFY:
  case WM_NCLBUTTONUP:case WM_NCLBUTTONDOWN:
  case WM_NCRBUTTONDOWN: case WM_NCRBUTTONUP:
  case WM_NCMBUTTONDOWN: case WM_NCMBUTTONUP:
  case WM_NCLBUTTONDBLCLK:case WM_NCMOUSEMOVE: