CListbox重绘，item文本不能在窗体初始化后立即显示，需要对着listbox点几下才能显示？各路大神帮忙看看

[w946995383_02]

代码如下：
CWLWListBox.h:

class CWLWListBox : public CListBox
{
	DECLARE_DYNAMIC(CWLWListBox)

public:
	CWLWListBox();
	virtual ~CWLWListBox();

	int AddString(LPCTSTR lpszItem);
	int AddString(LPCTSTR lpszItem, COLORREF rgb);
	int InsertString(int nIndex, LPCTSTR lpszItem);
	int InsertString(int nIndex, LPCTSTR lpszItem, COLORREF rgb);
	void SetItemColor(int nIndex, COLORREF rgb);

	BOOL m_nSelectChange;
	COLORREF m_clrFore;	// 前景颜色
	COLORREF m_clrBack;	// 背景颜色
	CBrush m_brush;

protected:
	DECLARE_MESSAGE_MAP()
public:
	afx_msg BOOL OnEraseBkgnd(CDC* pDC);
	afx_msg void OnLbnSelchange();
	afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
	virtual void DrawItem(LPDRAWITEMSTRUCT /*lpDrawItemStruct*/);
	afx_msg void OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);
	afx_msg void OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);
	afx_msg void OnPaint();
	virtual void MeasureItem(LPMEASUREITEMSTRUCT /*lpMeasureItemStruct*/);
};

CWLWListBox.cpp:

// WLWListBox.cpp : 实现文件
//

#include "stdafx.h"
#include "WLWListBox.h"


// CWLWListBox

IMPLEMENT_DYNAMIC(CWLWListBox, CListBox)

CWLWListBox::CWLWListBox()
{
	m_nSelectChange = FALSE;
}

CWLWListBox::~CWLWListBox()
{
}

int CWLWListBox::AddString(LPCTSTR lpszItem)
{
	return ((CListBox*)this)->AddString(lpszItem);
}

int CWLWListBox::AddString(LPCTSTR lpszItem, COLORREF rgb)
{
	int nIndex = CListBox::AddString(lpszItem);

	if (nIndex >= 0)
		SetItemData(nIndex, rgb);

	return nIndex;
}

int CWLWListBox::InsertString(int nIndex, LPCTSTR lpszItem)
{
	return ((CListBox*)this)->InsertString(nIndex, lpszItem);
}

int CWLWListBox::InsertString(int nIndex, LPCTSTR lpszItem, COLORREF rgb)
{
	int nItemIndex = ((CListBox*)this)->InsertString(nIndex, lpszItem);

	if (nItemIndex >= 0)
		SetItemData(nItemIndex, rgb);

	return nItemIndex;
}

void CWLWListBox::SetItemColor(int nIndex, COLORREF rgb)
{
	SetItemData(nIndex, rgb);
	RedrawWindow();
}


BEGIN_MESSAGE_MAP(CWLWListBox, CListBox)
	ON_WM_ERASEBKGND()
	ON_CONTROL_REFLECT(LBN_SELCHANGE, &CWLWListBox::OnLbnSelchange)
	ON_WM_LBUTTONDOWN()
	ON_WM_HSCROLL()
	ON_WM_VSCROLL()
	ON_WM_PAINT()
END_MESSAGE_MAP()



// CWLWListBox 消息处理程序

BOOL CWLWListBox::OnEraseBkgnd(CDC* pDC)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	
	//pDC->SetBkMode(TRANSPARENT);
	//CBitmap bitmap;
	//bitmap.LoadBitmap(IDB_BITMAP2);

	//CDC dcCompatible;
	//dcCompatible.CreateCompatibleDC(pDC);
	//CBitmap* pOldbitmap = dcCompatible.SelectObject(&bitmap);

	//CRect rect;
	//GetClientRect(&rect);  // 获取控件客户区的矩形区域

	//BITMAP bm;
	//bitmap.GetBitmap(&bm);
	//int nBmWidth = bm.bmWidth;
	//int nbmHeight = bm.bmHeight;
	//pDC->StretchBlt(0, 0, rect.Width(), rect.Height(), &dcCompatible, 0, 0, nBmWidth, nbmHeight, SRCCOPY);
	////pDC->BitBlt(0, 0, rect.Width(), rect.Height(), &dcCompatible, 0, 0, SRCCOPY);
	//dcCompatible.SelectObject(pOldbitmap);
	//return TRUE;

	return CListBox::OnEraseBkgnd(pDC);
}


void CWLWListBox::OnLbnSelchange()
{
	// TODO: 在此添加控件通知处理程序代码
//	m_nSelectChange = TRUE;
}


void CWLWListBox::OnLButtonDown(UINT nFlags, CPoint point)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
 	if (m_nSelectChange)
	{
		m_nSelectChange = FALSE;
		Invalidate();
	}
	CListBox::OnLButtonDown(nFlags, point);
}

void CWLWListBox::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{

	if (lpDrawItemStruct->itemID == -1)
	{
		DrawFocusRect(lpDrawItemStruct->hDC, &lpDrawItemStruct->rcItem);
		return;
	}

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

	COLORREF clrOld;
	CString sText;

	COLORREF clrNew = (COLORREF)(lpDrawItemStruct->itemData);

	// item处于被选中的状态，设置高亮
	if ((lpDrawItemStruct->itemState & ODS_SELECTED) &&
		(lpDrawItemStruct->itemAction & (ODA_SELECT | ODA_DRAWENTIRE)))
	{
		CBrush brush(::GetSysColor(COLOR_HIGHLIGHT));
		pDC->FillRect(&lpDrawItemStruct->rcItem, &brush);
	}

	// item丢失选中状态
	if (!(lpDrawItemStruct->itemState & ODS_SELECTED) &&
		(lpDrawItemStruct->itemAction & ODA_SELECT))
	{
		CBrush brush(::GetSysColor(COLOR_WINDOW));
		pDC->FillRect(&lpDrawItemStruct->rcItem, &brush);
	}

	// item获得焦点
	if ((lpDrawItemStruct->itemAction & ODA_FOCUS) &&
		(lpDrawItemStruct->itemState & ODS_FOCUS))
	{
		pDC->DrawFocusRect(&lpDrawItemStruct->rcItem);
	}

	// item丢失焦点
	if ((lpDrawItemStruct->itemAction & ODA_FOCUS) &&
		!(lpDrawItemStruct->itemState & ODS_FOCUS))
	{
		pDC->DrawFocusRect(&lpDrawItemStruct->rcItem);
	}

	// 设置背景模式为透明，并保存原有背景模式
	int nBkMode = pDC->SetBkMode(TRANSPARENT);

	if (lpDrawItemStruct->itemState & ODS_SELECTED)
		clrOld = pDC->SetTextColor(::GetSysColor(COLOR_HIGHLIGHTTEXT));
	else
		if (lpDrawItemStruct->itemState & ODS_DISABLED)
			clrOld = pDC->SetTextColor(::GetSysColor(COLOR_GRAYTEXT));
		else
			clrOld = pDC->SetTextColor(clrNew);

	// 获取item的text
	GetText(lpDrawItemStruct->itemID, sText);
	CRect rect = lpDrawItemStruct->rcItem;

	// 设置文本显示风格，一定要加上DT_EXPANDTABS
	UINT nFormat = DT_LEFT | DT_SINGLELINE | DT_VCENTER;
	if (GetStyle() & LBS_USETABSTOPS)
		nFormat |= DT_EXPANDTABS;

	// 绘制文本
	pDC->DrawText(sText, -1, &rect, nFormat);
	::OutputDebugString(sText + _T("\n"));

	// 恢复原有的字体颜色和背景模式
	pDC->SetTextColor(clrOld);
	pDC->SetBkMode(nBkMode);

}


void CWLWListBox::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	Invalidate();
	CListBox::OnHScroll(nSBCode, nPos, pScrollBar);
}


void CWLWListBox::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	Invalidate();
	CListBox::OnVScroll(nSBCode, nPos, pScrollBar);
}


void CWLWListBox::OnPaint()
{
	CPaintDC dc(this); // device context for painting
					   // TODO: 在此处添加消息处理程序代码
					   // 不为绘图消息调用 CListBox::OnPaint()

}


void CWLWListBox::MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct)
{
	lpMeasureItemStruct->itemHeight = ::GetSystemMetrics(SM_CYMENUCHECK);
	// TODO:  添加您的代码以确定指定项的大小
}

然后在一个测试对话框.h中
CWLWListBox m_listbox；

在测试对话框.cpp的OnInitDialog中

m_listbox.AddString(_T("空山新雨后"), RGB(255, 0, 0));
	m_listbox.AddString(_T("天气晚来秋"), RGB(0, 255, 0));
	m_listbox.AddString(_T("明月松间照"), RGB(0, 0, 255));
	m_listbox.AddString(_T("清泉石上流"), RGB(255, 0, 255));

其他的都是自动创建的，啥也没动，运行之后，listbox中一片空白，
需要对着控件点几下才会显示如下内容，

诸位帮个忙，看看如何才能在主对话框显示就能在listbox上看到文字？
没多少分了，先行谢过！跪谢！

[w946995383_02]

别沉啊，自顶+1

[w946995383_02]

别沉啊，自顶+2

[w946995383_02]

[tiger波波]

.h // afx_msg void OnPaint(); .cpp //void CWLWListBox::OnPaint() //{ // CPaintDC dc(this); // device context for painting //}

[w946995383_02]

引用 4 楼 tiger波波 的回复:

.h // afx_msg void OnPaint(); .cpp //void CWLWListBox::OnPaint() //{ // CPaintDC dc(this); // device context for painting //}

我草，神了，啥原因呢，是因为控件初始过程中响应了ON_WM_PAINT消息之后就不会调用 Clistbox::DrawItem 虚函数的原因吗

[tiger波波]

引用 5 楼 w946995383_02的回复:

[quote=引用 4 楼 tiger波波 的回复:].h // afx_msg void OnPaint(); .cpp //void CWLWListBox::OnPaint() //{ // CPaintDC dc(this); // device context for painting //}

我草，神了，啥原因呢，是因为控件初始过程中响应了ON_WM_PAINT消息之后就不会调用 Clistbox::DrawItem 虚函数的原因吗[/quote] 你不重写onpaint的话就不要把它拉出来，结果里边啥都没有。要重写的话记得第一句就调用父类的onpaint

[w946995383_02]

谢了，大神，我试了一下，OnPaint中第一句加上 ClistBox::OnPaint(),也能达到我想要的效果 再次感谢，结贴！