假设菜单是一种窗口,我做了两次试验,结果并不如预期.所以行不通.
不信自己试试,很简单,创建一个对话框,里面放一个编辑框,响应WM_CONTEXTMENU消息,使编辑框有对象菜单,响应WM_SETCURSOR,根据对象菜单的存在与否设置光标形状.
下面是我的两次试验的OnSetCursor代码,可以复制,加快试验速度.
BOOL CEditCtrl::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
CWnd* pChild = CWnd::FindWindowEx(m_hWnd, NULL, "#32768", NULL);
BOOL bOnMenu = pChild != NULL;
LPCSTR cursor = bOnMenu ? IDC_ARROW : IDC_IBEAM;
::SetCursor(LoadCursor(NULL, cursor));
return TRUE;
}
BOOL CEditCtrl::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
POINT point;
GetCursorPos(&point);
ScreenToClient(&point);
CWnd* pChild = ChildWindowFromPoint(point);
char className[48];
BOOL bOnMenu = FALSE;
if(pChild && pChild != this)
{
::GetClassName(pChild->m_hWnd, className, _countof(className));
if(strcmp(className, "#32768")==0)
bOnMenu = TRUE;
}
LPCSTR cursor = bOnMenu ? IDC_ARROW : IDC_IBEAM;
::SetCursor(LoadCursor(NULL, cursor));
return TRUE;
}
