ListBox控件自绘

原理和步骤和前面控件相差无几，这里就不讲了，只贴完整代码：

主对话框类：

#pragma once
#include "MyListBox.h"


// CListBox自绘Dlg 对话框
class CListBox自绘Dlg : public CDialogEx
{
// 构造
public:
	CListBox自绘Dlg(CWnd* pParent = NULL);	// 标准构造函数

// 对话框数据
	enum { IDD = IDD_LISTBOX_DIALOG };

	protected:
	virtual void DoDataExchange(CDataExchange* pDX);	// DDX/DDV 支持


// 实现
protected:
	HICON m_hIcon;

	// 生成的消息映射函数
	virtual BOOL OnInitDialog();
	afx_msg void OnPaint();
	afx_msg HCURSOR OnQueryDragIcon();
	DECLARE_MESSAGE_MAP()
public:
	CMyListBox m_ListBox;
	CImageList m_ImgList;
	afx_msg void OnBnClickedBtn();
};

// ListBox自绘Dlg.cpp : 实现文件
//

#include "stdafx.h"
#include "ListBox自绘.h"
#include "ListBox自绘Dlg.h"
#include "afxdialogex.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

// CListBox自绘Dlg 对话框

CListBox自绘Dlg::CListBox自绘Dlg(CWnd* pParent /*=NULL*/)
	: CDialogEx(CListBox自绘Dlg::IDD, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CListBox自绘Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialogEx::DoDataExchange(pDX);
	DDX_Control(pDX, IDC_LIST, m_ListBox);
}

BEGIN_MESSAGE_MAP(CListBox自绘Dlg, CDialogEx)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BTN, &CListBox自绘Dlg::OnBnClickedBtn)
END_MESSAGE_MAP()

BOOL CListBox自绘Dlg::OnInitDialog()
{
	CDialogEx::OnInitDialog();

	SetIcon(m_hIcon, TRUE);			// 设置大图标
	SetIcon(m_hIcon, FALSE);		// 设置小图标

	m_ImgList.Create(32,32,ILC_COLOR32|ILC_MASK,3,3);

	m_ImgList.Add(AfxGetApp()->LoadIcon(IDI_ICON1));
	m_ImgList.Add(AfxGetApp()->LoadIcon(IDI_ICON2));
	m_ImgList.Add(AfxGetApp()->LoadIcon(IDI_ICON3));

	m_ListBox.SetImageList(&m_ImgList);

	m_ListBox.AddString("北京",0);
	m_ListBox.AddString("上海",1);
	m_ListBox.AddString("广州",2);



	return TRUE;  
}

void CListBox自绘Dlg::OnPaint()
{
	if (IsIconic())
	{
		CPaintDC dc(this); // 用于绘制的设备上下文

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// 使图标在工作区矩形中居中
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// 绘制图标
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialogEx::OnPaint();
	}
}

HCURSOR CListBox自绘Dlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}

void CListBox自绘Dlg::OnBnClickedBtn()
{
	static int nCount = 1;

	CString strText;

	strText.Format("Item%d",nCount);

	m_ListBox.AddString(strText,nCount++ % 3);
}

CListBox的派生类：

#pragma once


// CMyListBox

class CMyListBox : public CListBox
{
	DECLARE_DYNAMIC(CMyListBox)

public:
	CMyListBox();
	virtual ~CMyListBox();

protected:
	DECLARE_MESSAGE_MAP()
public:

	struct SLBData{     //存放文本和图标索引数据
		CString strText;
		int nImgIndex;
		SLBData()
		{
			strText.Empty();
			nImgIndex = -1;
		}
	};

	CImageList* m_ImgList;//接收主对话框类传递过来的CImageList对象
	virtual void DrawItem(LPDRAWITEMSTRUCT lpDIS);//重绘函数
	CImageList* SetImageList(CImageList* pImgList);//传递CImageList对象到派生类
	int AddString(CString strText,int nImgIndex);//保存要插入的文本和图标索引
	int GetText(int nItemIndex,CString& strText);//由当前绘制项的索引获取文本
	int GetImage(int nItemIndex,int& nImageIndex);//由当前绘制项的索引获取对应图标的索引
	void ReleaseMemory();//ListBox销毁时释放申请的所有内存
	virtual void MeasureItem(LPMEASUREITEMSTRUCT lpMIS);
	afx_msg void OnDestroy();
};

// MyListBox.cpp : 实现文件
//

#include "stdafx.h"
#include "ListBox自绘.h"
#include "MyListBox.h"


// CMyListBox

IMPLEMENT_DYNAMIC(CMyListBox, CListBox)

CMyListBox::CMyListBox()
{
	m_ImgList = NULL;
}

CMyListBox::~CMyListBox()
{
	//内存的销毁不能放在析构函数中，因为此时ListBox对象已经销毁
	//在ReleaseMemory()中调用GetCount()函数等已经没有意义，会报错:

	/*ASSERT(::IsWindow(m_hWnd));*/

	//ReleaseMemory();
}


BEGIN_MESSAGE_MAP(CMyListBox, CListBox)
	ON_WM_DESTROY()
END_MESSAGE_MAP()



// CMyListBox 消息处理程序

void CMyListBox::DrawItem(LPDRAWITEMSTRUCT lpDIS)
{
	CDC dc;
	dc.Attach(lpDIS->hDC);

	CRect ListBRect = lpDIS->rcItem;

	int nCurItemIndex = lpDIS->itemID;

	if(nCurItemIndex == -1) return;  

	dc.SetBkMode(TRANSPARENT);  

	if (lpDIS->itemState & ODS_SELECTED)//选中项设置  
	{  
		dc.SetTextColor(GetSysColor(COLOR_HIGHLIGHTTEXT));  
		dc.FillSolidRect(&ListBRect,GetSysColor(COLOR_HIGHLIGHT));  

		if(lpDIS->itemAction & ODA_FOCUS) dc.DrawFocusRect(&ListBRect);  
	}   
	else//非选中项设置  
	{  
		dc.SetTextColor(GetSysColor(COLOR_WINDOWTEXT));

		if(nCurItemIndex % 2) dc.FillSolidRect(&ListBRect,RGB(0,192,192));  

		else dc.FillSolidRect(&ListBRect,RGB(192,192,0));
		
	}  

	//画文字  
	CRect TextRect = ListBRect;  

	CString strText;  

	GetText(nCurItemIndex,strText);//获取正在自绘项的文字  

	//TRACE("nItem = %d\r\n",nCurItemIndex);  

	CSize TempSize;

	ImageList_GetIconSize(m_ImgList->m_hImageList, (int*)&TempSize.cx, (int*)&TempSize.cy);

	TextRect.left = TextRect.left + TempSize.cx + 4;  

	dc.DrawText(strText,&TextRect,DT_LEFT|DT_VCENTER|DT_SINGLELINE);  

	//画图标  
	CRect IconRect = ListBRect;  

	int nImageIndex;  

	GetImage(nCurItemIndex,nImageIndex);   

	m_ImgList->Draw(&dc,nImageIndex,IconRect.TopLeft(),ILD_NORMAL); 

	dc.Detach();
}

CImageList* CMyListBox::SetImageList(CImageList* pImgList)
{
	CImageList* pOldImgList = m_ImgList;

	m_ImgList = pImgList;

	return pOldImgList;
}

int CMyListBox::AddString(CString strText,int nImgIndex)
{
	int nIndex = CListBox::AddString(strText);

	SLBData* pLBData = new SLBData;

	if(pLBData == NULL) return -1;

	pLBData->strText = strText;

	pLBData->nImgIndex = nImgIndex;

	CListBox::SetItemData(nIndex,(DWORD_PTR)pLBData);

	return nIndex;
}

int CMyListBox::GetText(int nItemIndex,CString& strText)
{
	SLBData* pData = (SLBData*)CListBox::GetItemData(nItemIndex);

	if(pData == NULL) return 0;

	strText = pData->strText;

	return 1;
}

int CMyListBox::GetImage(int nItemIndex,int& nImageIndex)
{
	SLBData* pData = (SLBData*)CListBox::GetItemData(nItemIndex);

    if(pData == NULL) return 0;

	nImageIndex = pData->nImgIndex;

	return 1;
}

void CMyListBox::ReleaseMemory()
{
	int nItemCount = CListBox::GetCount();

	for (int i = 0;i < nItemCount;i++)
	{
		SLBData* pData = (SLBData*)CListBox::GetItemData(i);

		if (pData)
		{
			delete pData;

			pData = NULL;
		}
	}

	CListBox::ResetContent();
}

void CMyListBox::MeasureItem(LPMEASUREITEMSTRUCT lpMIS)
{
	CSize TempSize;

	ImageList_GetIconSize(m_ImgList->m_hImageList, (int*)&TempSize.cx, (int*)&TempSize.cy);

	lpMIS->itemHeight = TempSize.cy;

	/*int nItem = lpMIS->itemID;

	if(nItem % 2) lpMIS->itemHeight = 100;*/

	//lpMIS->itemHeight = 20;
}


void CMyListBox::OnDestroy()
{
	CListBox::OnDestroy();

	ReleaseMemory();
}