学步园

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。

#if !defined(AFX_MULITLINELISTBOX_H__D705CB99_9FD0_424E_BD71_027547449AE5__INCLUDED_)<br /> #define AFX_MULITLINELISTBOX_H__D705CB99_9FD0_424E_BD71_027547449AE5__INCLUDED_</p> <p>#if _MSC_VER > 1000<br /> #pragma once<br /> #endif // _MSC_VER > 1000<br /> // MulitLineListBox.h : header file<br /> //</p> <p>/////////////////////////////////////////////////////////////////////////////<br /> // CMulitLineListBox window<br /> typedef struct _LISTBOX_COLOR_<br /> {<br /> CString strText;<br /> COLORREF fgColor;<br /> COLORREF bgColor;<br /> _LISTBOX_COLOR_()<br /> {<br /> strText.Empty();<br /> fgColor = RGB(0, 0, 0);<br /> bgColor = RGB(255, 255, 255);<br /> }<br /> }LISTBOX_COLOR, *PLISTBOX_COLOR;</p> <p>class CMulitLineListBox : public CListBox<br /> {<br /> // Construction<br /> public:<br /> CMulitLineListBox();</p> <p>// Attributes<br /> public:<br /> void AppendString(LPCSTR lpszText, COLORREF fgColor, COLORREF bgColor);<br /> // Operations<br /> public:</p> <p>// Overrides<br /> // ClassWizard generated virtual function overrides<br /> //{{AFX_VIRTUAL(CMulitLineListBox)<br /> public:<br /> virtual void MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct);<br /> virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);<br /> //}}AFX_VIRTUAL</p> <p>// Implementation<br /> public:<br /> virtual ~CMulitLineListBox();</p> <p> // Generated message map functions<br /> protected:<br /> //{{AFX_MSG(CMulitLineListBox)<br /> afx_msg void OnDestroy();<br /> //}}AFX_MSG</p> <p> DECLARE_MESSAGE_MAP()<br /> };</p> <p>/////////////////////////////////////////////////////////////////////////////</p> <p>//{{AFX_INSERT_LOCATION}}<br /> // Microsoft Visual C++ will insert additional declarations immediately before the previous line.</p> <p>#endif // !defined(AFX_MULITLINELISTBOX_H__D705CB99_9FD0_424E_BD71_027547449AE5__INCLUDED_)<br />

 // MulitLineListBox.cpp : implementation file<br /> //</p> <p>#include "stdafx.h"<br /> #include "MulitLineListBox.h"</p> <p>#ifdef _DEBUG<br /> #define new DEBUG_NEW<br /> #undef THIS_FILE<br /> static char THIS_FILE[] = __FILE__;<br /> #endif</p> <p>/////////////////////////////////////////////////////////////////////////////<br /> // CMulitLineListBox</p> <p>CMulitLineListBox::CMulitLineListBox()<br /> {<br /> }</p> <p>CMulitLineListBox::~CMulitLineListBox()<br /> {<br /> }</p> <p>BEGIN_MESSAGE_MAP(CMulitLineListBox, CListBox)<br /> //{{AFX_MSG_MAP(CMulitLineListBox)<br /> ON_WM_DESTROY()<br /> //}}AFX_MSG_MAP<br /> END_MESSAGE_MAP()</p> <p>/////////////////////////////////////////////////////////////////////////////<br /> // CMulitLineListBox message handlers<br /> void CMulitLineListBox::AppendString(LPCSTR lpszText, COLORREF fgColor, COLORREF bgColor)<br /> {<br /> LISTBOX_COLOR* pInfo = new LISTBOX_COLOR;</p> <p> pInfo->strText.Format(_T("%s"), lpszText);<br /> pInfo->fgColor = fgColor;<br /> pInfo->bgColor = bgColor;</p> <p> SetItemDataPtr(AddString(pInfo->strText), pInfo);<br /> }</p> <p>void CMulitLineListBox::MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct)<br /> {<br /> // TODO: Add your code to determine the size of specified item<br /> ASSERT(lpMeasureItemStruct->CtlType == ODT_LISTBOX);</p> <p> CString strText(_T(""));<br /> GetText(lpMeasureItemStruct->itemID, strText);<br /> ASSERT(TRUE != strText.IsEmpty());</p> <p> CRect rect;<br /> GetItemRect(lpMeasureItemStruct->itemID, &rect);</p> <p> CDC* pDC = GetDC();<br /> lpMeasureItemStruct->itemHeight = pDC->DrawText(strText, -1, rect, DT_WORDBREAK | DT_CALCRECT);<br /> ReleaseDC(pDC);<br /> }</p> <p>void CMulitLineListBox::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)<br /> {<br /> // TODO: Add your code to draw the specified item<br /> ASSERT(lpDrawItemStruct->CtlType == ODT_LISTBOX);</p> <p> LISTBOX_COLOR* pListBox = (LISTBOX_COLOR*)GetItemDataPtr(lpDrawItemStruct->itemID);<br /> ASSERT(NULL != pListBox);</p> <p> CDC dc;</p> <p> dc.Attach(lpDrawItemStruct->hDC);</p> <p> // Save these value to restore them when done drawing.<br /> COLORREF crOldTextColor = dc.GetTextColor();<br /> COLORREF crOldBkColor = dc.GetBkColor();</p> <p> // If this item is selected, set the background color<br /> // and the text color to appropriate values. Also, erase<br /> // rect by filling it with the background color.<br /> if ((lpDrawItemStruct->itemAction | ODA_SELECT) &&<br /> (lpDrawItemStruct->itemState & ODS_SELECTED))<br /> {<br /> dc.SetTextColor(pListBox->bgColor);<br /> dc.SetBkColor(pListBox->fgColor);<br /> dc.FillSolidRect(&lpDrawItemStruct->rcItem, pListBox->fgColor);<br /> }<br /> else<br /> {<br /> dc.SetTextColor(pListBox->fgColor);<br /> dc.SetBkColor(pListBox->bgColor);<br /> dc.FillSolidRect(&lpDrawItemStruct->rcItem, pListBox->bgColor);<br /> }</p> <p> lpDrawItemStruct->rcItem.left += 5;<br /> // Draw the text.</p> <p> dc.DrawText(pListBox->strText, pListBox->strText.GetLength(), &lpDrawItemStruct->rcItem, DT_WORDBREAK);</p> <p> // Reset the background color and the text color back to their<br /> // original values.<br /> dc.SetTextColor(crOldTextColor);<br /> dc.SetBkColor(crOldBkColor);</p> <p> dc.Detach();<br /> }</p> <p>void CMulitLineListBox::OnDestroy()<br /> {<br /> int nCount = GetCount();<br /> for(int i=0; i<nCount; i++)<br /> {<br /> LISTBOX_COLOR* pList = (LISTBOX_COLOR*)GetItemDataPtr(i);<br /> delete pList;<br /> pList = NULL;<br /> }</p> <p> CListBox::OnDestroy();</p> <p> // TODO: Add your message handler code here<br /> }<br />

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</p> <p>#define IDC_LISTBOX 0x11<br /> CRect rc;<br /> GetClientRect(&rc);<br /> rc.bottom -= 35;<br /> rc.DeflateRect(CSize(10, 10));<br /> m_listBox.Create(WS_CHILD | WS_VISIBLE | WS_BORDER | WS_HSCROLL | WS_VSCROLL |<br /> LBS_OWNERDRAWVARIABLE | LBS_HASSTRINGS, rc, this, IDC_LISTBOX);</p> <p> CString strText(_T(""));<br /> COLORREF fgColor;<br /> COLORREF bgColor;<br /> for(int i=0; i<20; i++)<br /> {<br /> if(i%2)<br /> strText = _T("Hello, World!");<br /> else<br /> strText = _T("Hello, World!/r/nHello, World!");<br /> fgColor = RGB(128, 0, i*7%128);<br /> bgColor = RGB(0, i*7%128, 0);<br /> m_listBox.AppendString(strText, fgColor, bgColor);<br /> }

显示的效果图如下所示：