CMFCListCtrl使用GroupView时组内排序解决方案

CMFCListCtrl是MFC Feature Pack中提供的新类，它很好的封装了CListCtrl的排序功能，

只要重写比较函数就OK了。

 

virtual int OnCompareItems(LPARAM lParam1, LPARAM lParam2, int iColumn);

 

但是，在使用GroupView模式时，以上的比较函数仍然被调用，但并没有排序。

 

AFX_INLINE int CListCtrl::EnableGroupView(BOOL fEnable)
{
	ASSERT(::IsWindow(m_hWnd));
	return (int)ListView_EnableGroupView(m_hWnd, fEnable); // LVM_ENABLEGROUPVIEW
}

 

面对以上问题，对CMFCListCtrl派生出CGroupSortableListCtrl类，以实现组内排序。

  

 

以下附上代码：

#pragma once


// CGroupSortableListCtrl

class CGroupSortableListCtrl : public CMFCListCtrl
{
	DECLARE_DYNAMIC(CGroupSortableListCtrl)

public:
	CGroupSortableListCtrl();
	virtual ~CGroupSortableListCtrl();

protected:
	DECLARE_MESSAGE_MAP()

protected:
	static int CALLBACK CompareGroupProc(int iGroupId1, int iGroupId2,  void* lParamSort);

public:
	virtual void Sort(int iColumn, BOOL bAscending  = TRUE , BOOL bAdd  = FALSE);
	virtual int OnCompareGroups(int iGroupId1, int iGroupId2, int iColumn);
};


// CGroupSortableListCtrl

IMPLEMENT_DYNAMIC(CGroupSortableListCtrl, CMFCListCtrl)

CGroupSortableListCtrl::CGroupSortableListCtrl()
{

}

CGroupSortableListCtrl::~CGroupSortableListCtrl()
{
}


BEGIN_MESSAGE_MAP(CGroupSortableListCtrl, CMFCListCtrl)
END_MESSAGE_MAP()


void CGroupSortableListCtrl::Sort(int iColumn, BOOL bAscending/* = TRUE*/, BOOL bAdd/* = FALSE*/)
{
	CWaitCursor wait;

	GetHeaderCtrl().SetSortColumn(iColumn, bAscending, bAdd);

	m_iSortedColumn = iColumn;
	m_bAscending = bAscending;
	if (IsGroupViewEnabled())
	{
		ListView_SortGroups(m_hWnd, CompareGroupProc, this);
	}
	SortItems(CompareProc, (LPARAM)this);
}

int CGroupSortableListCtrl::CompareGroupProc(int iGroupId1, int iGroupId2, void* lParamSort)
{
	CGroupSortableListCtrl* pList = (CGroupSortableListCtrl*)lParamSort;
	ASSERT_VALID(pList);

	int nRes = pList->OnCompareGroups(iGroupId1, iGroupId2, pList->m_iSortedColumn);
	nRes = pList->m_bAscending ? nRes : -nRes;

	return nRes;
}

int CGroupSortableListCtrl::OnCompareGroups(int /*iGroupId1*/, int /*iGroupId2*/, int /*iColumn*/)
{
	return  0;
}