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Changing Row Height in an owner drawn Control

, 8 Nov 2001 CPOL
Changing the Row Height in an owner drawn List View Control
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// ListCtrlEx.cpp : implementation file
//

#include "stdafx.h"
#include "Multiline.h"
#include "ListCtrlEx.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CListCtrlEx

CListCtrlEx::CListCtrlEx()
{
}

CListCtrlEx::~CListCtrlEx()
{
}


BEGIN_MESSAGE_MAP(CListCtrlEx, CListCtrl)
	//{{AFX_MSG_MAP(CListCtrlEx)
	ON_MESSAGE(WM_SETFONT, OnSetFont)
	ON_WM_MEASUREITEM_REFLECT()
	ON_WM_MEASUREITEM()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CListCtrlEx message handlers

void CListCtrlEx::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) 
{
	TCHAR  lpBuffer[256];

	LV_ITEM lvi;

	lvi.mask = LVIF_TEXT | LVIF_PARAM ;
	lvi.iItem = lpDrawItemStruct->itemID ; 	
	lvi.iSubItem = 0;
	lvi.pszText = lpBuffer ;
	lvi.cchTextMax = sizeof(lpBuffer);
	VERIFY(GetItem(&lvi));

	LV_COLUMN lvc, lvcprev ;
	::ZeroMemory(&lvc, sizeof(lvc));
	::ZeroMemory(&lvcprev, sizeof(lvcprev));
	lvc.mask = LVCF_WIDTH | LVCF_FMT;
	lvcprev.mask = LVCF_WIDTH | LVCF_FMT;

	for ( int nCol=0; GetColumn(nCol, &lvc); nCol++)
	{
		if ( nCol > 0 ) 
		{
			// Get Previous Column Width in order to move the next display item
			GetColumn(nCol-1, &lvcprev) ;
			lpDrawItemStruct->rcItem.left += lvcprev.cx ;
			lpDrawItemStruct->rcItem.right += lpDrawItemStruct->rcItem.left ;	
		}

		// Get the text 
		::ZeroMemory(&lvi, sizeof(lvi));
		lvi.iItem = lpDrawItemStruct->itemID;
		lvi.mask = LVIF_TEXT | LVIF_PARAM;
		lvi.iSubItem = nCol;
		lvi.pszText = lpBuffer;
		lvi.cchTextMax = sizeof(lpBuffer);
		VERIFY(GetItem(&lvi));

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

		if ( lpDrawItemStruct->itemState & ODS_SELECTED )
		{
			pDC->FillSolidRect(&lpDrawItemStruct->rcItem, GetSysColor(COLOR_HIGHLIGHT)) ; 
			pDC->SetTextColor(GetSysColor(COLOR_HIGHLIGHTTEXT)) ;
		}
		else
		{
			pDC->FillSolidRect(&lpDrawItemStruct->rcItem, GetSysColor(COLOR_WINDOW)) ;
			pDC->SetTextColor(GetSysColor(COLOR_WINDOWTEXT)) ; 
		}
		
		pDC->SelectObject(GetStockObject(DEFAULT_GUI_FONT));

		UINT		uFormat    = DT_LEFT ;

		::DrawText(lpDrawItemStruct->hDC, lpBuffer, strlen(lpBuffer), 
			 &lpDrawItemStruct->rcItem, uFormat) ;

		pDC->SelectStockObject(SYSTEM_FONT) ;
	}
}

LRESULT CListCtrlEx::OnSetFont(WPARAM wParam, LPARAM lParam)
{
	CRect rc;
	GetWindowRect(&rc);

	WINDOWPOS wp;
	wp.hwnd = this->m_hWnd;
	wp.cx = rc.Width() ;
	wp.cy = rc.Height() ;
	wp.flags = SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOOWNERZORDER | SWP_NOZORDER;

	LRESULT lrReturn(Default());

	SendMessage(WM_WINDOWPOSCHANGED, 0, reinterpret_cast<LPARAM> (&wp));

	return lrReturn;
}

void CListCtrlEx::MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct) 
{
	// Get the LOGFONT for the current font.
	LOGFONT lf;
	::ZeroMemory(&lf, sizeof(lf));

	CFont* pFont = GetFont();
	ASSERT_VALID(pFont);
	
	if (pFont) 
		VERIFY(pFont->GetLogFont(&lf));

	int nAdj(4) ;
	m_nLinesPerRow = max(m_nLinesPerRow, 1);

	if (lf.lfHeight < 0) 
		lpMeasureItemStruct->itemHeight = ((-lf.lfHeight+nAdj) * (m_nLinesPerRow));
	else 
		lpMeasureItemStruct->itemHeight = ((lf.lfHeight+nAdj) * (m_nLinesPerRow));
}


void CListCtrlEx::OnInitialUpdate() 
{
	int i, j ;

	LV_COLUMN lvc;
	lvc.mask = LVCF_FMT | LVCF_WIDTH | LVCF_TEXT | LVCF_SUBITEM;

	// Insert Header columns
	for(i = 0; i<m_nColumns; i++)
	{
		lvc.iSubItem = i;
		lvc.pszText = _gszColumnLabel[i];
		lvc.cx = _gnColumnWidth[i];
		lvc.fmt = _gnColumnFmt[i];
		InsertColumn(i,&lvc);
	}

	// Insert First Column items for every row
	LV_ITEM lvi;
	lvi.mask = LVIF_TEXT | LVIF_STATE ;

	char	buf[51] ;
	for(i=0; i<m_nRows; i++)
	{
		sprintf(buf, "Line 1 text \n lots a a \n more text") ;
		lvi.iItem = i;
		lvi.iSubItem = 0;
		lvi.state = LVIS_SELECTED | LVIS_FOCUSED ;
		lvi.stateMask = LVIS_SELECTED | LVIS_FOCUSED ;
		lvi.pszText = buf ;
		InsertItem(&lvi);

        if (i == 0) m_nLinesPerRow = 3;
		else m_nLinesPerRow = 5;

		for(j = 1; j<m_nColumns; j++)
		{
			SetItemText(i,j,_gszItem[i][j]);
		}
	}

//	if ( m_nLinesPerRow > 1 ) 
//	{
		m_NewListFont.CreatePointFont(180,"MS Serif");
		SetFont(&m_NewListFont);
//	}

	CHeaderCtrl* pHeader = NULL;
	pHeader=GetHeaderCtrl();

	if(pHeader==NULL)
		return;
	
	VERIFY(m_HeaderCtrl.SubclassWindow(pHeader->m_hWnd));	

	HDITEM hdItem;

	hdItem.mask = HDI_FORMAT;

	for(i=0; i<m_HeaderCtrl.GetItemCount(); i++)
	{
		m_HeaderCtrl.GetItem(i,&hdItem);

		hdItem.fmt|= HDF_OWNERDRAW;
		
		m_HeaderCtrl.SetItem(i,&hdItem);
	}
}

void CListCtrlEx::OnMeasureItem(int nIDCtl, LPMEASUREITEMSTRUCT lpMeasureItemStruct) 
{

	CListCtrl::OnMeasureItem(nIDCtl, lpMeasureItemStruct);
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Uwe Keim
Chief Technology Officer Zeta Producer Desktop CMS
Germany Germany
Uwe does programming since 1989 with experiences in Assembler, C++, MFC and lots of web- and database stuff and now uses ASP.NET and C# extensively, too. He has also teached programming to students at the local university.
 
In his free time, he does climbing, running and mountain biking. Recently he became a father of a cute boy.
 
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Web03 | 2.8.141223.1 | Last Updated 9 Nov 2001
Article Copyright 2001 by Uwe Keim
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