自绘CListBox，使用EnableWindow函数，字有点重影

class CColorListBox : public CListBox

{

	DECLARE_DYNAMIC(CColorListBox)







public:

	CColorListBox();

	virtual ~CColorListBox();



public:

	int AddString(LPCTSTR lpszItem);

	int AddString(LPCTSTR lpszItem, COLORREF rgb);



public:

	virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);

	virtual void MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct);

//cpp

void CColorListBox::DrawItem(LPDRAWITEMSTRUCT lpDIS) 

{

	if ((int)lpDIS->itemID < 0)

		return;



	CDC* pDC = CDC::FromHandle(lpDIS->hDC);



	COLORREF crText;

	CString sText;

	COLORREF crNorm = (COLORREF)lpDIS->itemData;		// Color information is in item data.

	COLORREF crHilite = RGB(255 - GetRValue(crNorm), 255 - GetGValue(crNorm), 255 - GetBValue(crNorm));



	// If item has been selected, draw the highlight rectangle using the item's color.

	if ((lpDIS->itemState & ODS_SELECTED) &&

		(lpDIS->itemAction & (ODA_SELECT | ODA_DRAWENTIRE)))

	{

		CBrush brush(RGB(51, 153, 255));

		pDC->FillRect(&lpDIS->rcItem, &brush);

	}



	// If item has been deselected, draw the rectangle using the window color.

	if (!(lpDIS->itemState & ODS_SELECTED) && (lpDIS->itemAction & ODA_SELECT))

	{

		CBrush brush(::GetSysColor(COLOR_WINDOW));

		pDC->FillRect(&lpDIS->rcItem, &brush);

	}



	// If item has focus, draw the focus rect.

	if ((lpDIS->itemAction & ODA_FOCUS) && (lpDIS->itemState & ODS_FOCUS))

		pDC->DrawFocusRect(&lpDIS->rcItem);



	// If item does not have focus, redraw (erase) the focus rect.

	if ((lpDIS->itemAction & ODA_FOCUS) && !(lpDIS->itemState & ODS_FOCUS))

		pDC->DrawFocusRect(&lpDIS->rcItem);





	// Set the background mode to TRANSPARENT to draw the text.

	int nBkMode = pDC->SetBkMode(TRANSPARENT);



	// If the item's color information is set, use the highlight color

	// gray text color, or normal color for the text.

	if (lpDIS->itemData)

	{

		if (lpDIS->itemState & ODS_SELECTED)

			crText = pDC->SetTextColor(crHilite);

		else if (lpDIS->itemState & ODS_DISABLED)

			crText = pDC->SetTextColor(::GetSysColor(COLOR_GRAYTEXT));

		else

			crText = pDC->SetTextColor(crNorm);

	}

	// Else the item's color information is not set, so use the

	// system colors for the text.

	else

	{

		if (lpDIS->itemState & ODS_SELECTED)

			crText = pDC->SetTextColor(::GetSysColor(COLOR_HIGHLIGHTTEXT));

		else if (lpDIS->itemState & ODS_DISABLED)

			crText = pDC->SetTextColor(::GetSysColor(COLOR_GRAYTEXT));

		else

			crText = pDC->SetTextColor(::GetSysColor(COLOR_WINDOWTEXT));

	}





	// Get and display item text.

	GetText(lpDIS->itemID, sText);

	CRect rect = lpDIS->rcItem;



	// Setup the text format.

	UINT nFormat = DT_LEFT | DT_SINGLELINE | DT_VCENTER;

	if (GetStyle() & LBS_USETABSTOPS)

		nFormat |= DT_EXPANDTABS;



	// Calculate the rectangle size before drawing the text.

	pDC->DrawText(sText, -1, &rect, nFormat | DT_CALCRECT);

	pDC->DrawText(sText, -1, &rect, nFormat);



	pDC->SetTextColor(crText);

	pDC->SetBkMode(nBkMode);

}



//-------------------------------------------------------------------

void CColorListBox::MeasureItem(LPMEASUREITEMSTRUCT lpMIS)

{

	lpMIS->itemHeight = ::GetSystemMetrics(SM_CYMENUCHECK);

}



//-------------------------------------------------------------------

int CColorListBox::AddString(LPCTSTR lpszItem)

{

	return ((CListBox*)this)->AddString(lpszItem);

}



//-------------------------------------------------------------------

int CColorListBox::AddString(LPCTSTR lpszItem, COLORREF rgb)

{

	int nItem = AddString(lpszItem);

	if (nItem >= 0)

		SetItemData(nItem, rgb);

	return nItem;

}

//调用

void CCListBoxTestDlg::OnBnClickedButton1()

{

	m_colorListBox.AddString("111000", RGB(0, 0, 0));

	m_colorListBox.AddString("111000", RGB(128, 128, 128));

}





void CCListBoxTestDlg::OnBnClickedCheck1()

{

	// TODO: 在此添加控件通知处理程序代码

	my_bCheck = !my_bCheck;

	m_colorListBox.EnableWindow(my_bCheck);

}