简单的自绘CListBox(二)（多行显示，支持前景色和背景色的变更）

简单的自绘CListBox(二)（多行显示，支持前景色和背景色的变更）

简单的自绘CListBox，支持多行显示和前景色和背景色的更换。下面是相关的H头文件和CPP文件

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#if !defined(AFX_MULITLINELISTBOX_H__D705CB99_9FD0_424E_BD71_027547449AE5__INCLUDED_)

#define AFX_MULITLINELISTBOX_H__D705CB99_9FD0_424E_BD71_027547449AE5__INCLUDED_

#if _MSC_VER > 1000

#pragma once

#endif // _MSC_VER > 1000

// MulitLineListBox.h : header file

//

/////////////////////////////////////////////////////////////////////////////

// CMulitLineListBox window

typedef struct _LISTBOX_COLOR_

{

CString strText;

COLORREF fgColor;

COLORREF bgColor;

_LISTBOX_COLOR_()

{

strText.Empty();

fgColor = #000000;

bgColor = #ffffff;

}

}LISTBOX_COLOR, *PLISTBOX_COLOR;

class CMulitLineListBox : public CListBox

{

// Construction

public:

CMulitLineListBox();

// Attributes

public:

void AppendString(LPCSTR lpszText, COLORREF fgColor, COLORREF bgColor);

// Operations

public:

// Overrides

// ClassWizard generated virtual function overrides

//{{AFX_VIRTUAL(CMulitLineListBox)

public:

virtual void MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct);

virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);

//}}AFX_VIRTUAL

// Implementation

public:

virtual ~CMulitLineListBox();

// Generated message map functions

protected:

//{{AFX_MSG(CMulitLineListBox)

afx_msg void OnDestroy();

//}}AFX_MSG

DECLARE_MESSAGE_MAP()

};

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}

// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_MULITLINELISTBOX_H__D705CB99_9FD0_424E_BD71_027547449AE5__INCLUDED_)

==============================================================================================================

// MulitLineListBox.cpp : implementation file

//

#include "stdafx.h"

#include "MulitLineListBox.h"

#ifdef _DEBUG

#define new DEBUG_NEW

#undef THIS_FILE

static char THIS_FILE[] = __FILE__;

#endif

/////////////////////////////////////////////////////////////////////////////

// CMulitLineListBox

CMulitLineListBox::CMulitLineListBox()

{

}

CMulitLineListBox::~CMulitLineListBox()

{

}

BEGIN_MESSAGE_MAP(CMulitLineListBox, CListBox)

//{{AFX_MSG_MAP(CMulitLineListBox)

ON_WM_DESTROY()

//}}AFX_MSG_MAP

END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////

// CMulitLineListBox message handlers

void CMulitLineListBox::AppendString(LPCSTR lpszText, COLORREF fgColor, COLORREF bgColor)

{

LISTBOX_COLOR* pInfo = new LISTBOX_COLOR;

pInfo->strText.Format(_T("%s"), lpszText);

pInfo->fgColor = fgColor; 

pInfo->bgColor = bgColor;

SetItemDataPtr(AddString(pInfo->strText), pInfo);

}

void CMulitLineListBox::MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct) 

{

// TODO: Add your code to determine the size of specified item

ASSERT(lpMeasureItemStruct->CtlType == ODT_LISTBOX);

CString strText(_T(""));

GetText(lpMeasureItemStruct->itemID, strText);

ASSERT(TRUE != strText.IsEmpty());

CRect rect;

GetItemRect(lpMeasureItemStruct->itemID, &rect);

CDC* pDC = GetDC(); 

lpMeasureItemStruct->itemHeight = pDC->DrawText(strText, -1, rect, DT_WORDBREAK | DT_CALCRECT); 

ReleaseDC(pDC);

}

void CMulitLineListBox::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) 

{

// TODO: Add your code to draw the specified item

ASSERT(lpDrawItemStruct->CtlType == ODT_LISTBOX);

LISTBOX_COLOR* pListBox = (LISTBOX_COLOR*)GetItemDataPtr(lpDrawItemStruct->itemID);

ASSERT(NULL != pListBox);

CDC dc;

dc.Attach(lpDrawItemStruct->hDC);

// Save these value to restore them when done drawing.

COLORREF crOldTextColor = dc.GetTextColor();

COLORREF crOldBkColor = dc.GetBkColor();

// If this item is selected, set the background color 

// and the text color to appropriate values. Also, erase

// rect by filling it with the background color.

if ((lpDrawItemStruct->itemAction | ODA_SELECT) &&

(lpDrawItemStruct->itemState & ODS_SELECTED))

{

dc.SetTextColor(pListBox->bgColor);

dc.SetBkColor(pListBox->fgColor);

dc.FillSolidRect(&lpDrawItemStruct->rcItem, pListBox->fgColor);

}

else

{

dc.SetTextColor(pListBox->fgColor);

dc.SetBkColor(pListBox->bgColor);

dc.FillSolidRect(&lpDrawItemStruct->rcItem, pListBox->bgColor);

}

lpDrawItemStruct->rcItem.left += 5;

// Draw the text.

dc.DrawText(pListBox->strText, pListBox->strText.GetLength(), &lpDrawItemStruct->rcItem, DT_WORDBREAK);

// Reset the background color and the text color back to their

// original values.

dc.SetTextColor(crOldTextColor);

dc.SetBkColor(crOldBkColor);

dc.Detach();

}

void CMulitLineListBox::OnDestroy() 

{

int nCount = GetCount();

for(int i=0; i<nCount; i++)

{

LISTBOX_COLOR* pList = (LISTBOX_COLOR*)GetItemDataPtr(i);

delete pList;

pList = NULL;

}

CListBox::OnDestroy();

// TODO: Add your message handler code here

}

===========================================================

调用方法，在主对话框类的OnInitDialog函数中加入下面的代码即可

 

CMulitLineListBox m_listBox; // 成员变量

#define IDC_LISTBOX 0x11

CRect rc;

GetClientRect(&rc);

rc.bottom -= 35;

rc.DeflateRect(CSize(10, 10));

m_listBox.Create(WS_CHILD | WS_VISIBLE | WS_BORDER | WS_HSCROLL | WS_VSCROLL |

LBS_OWNERDRAWVARIABLE | LBS_HASSTRINGS, rc, this, IDC_LISTBOX);

CString strText(_T(""));

COLORREF fgColor;

COLORREF bgColor;

for(int i=0; i<20; i++)

{

if(i%2)

strText = _T("Hello, World!");

else

strText = _T("Hello, World!/r/nHello, World!");

fgColor = RGB(128, 0, i*7%128);

bgColor = RGB(0, i*7%128, 0);

m_listBox.AppendString(strText, fgColor, bgColor);

}

 

显示的效果图如下所示：