itemcombobox.cpp

用Visual c++.net开发的图书管理系统

#include "stdafx.h"
#include "ItemComboBox.h"
#include ".\itemcombobox.h"


// CItemComboBox

IMPLEMENT_DYNAMIC(CItemComboBox, CComboBox)
CItemComboBox::CItemComboBox()
{
	m_pList = NULL;
	m_nItem = -1;
	m_nSubItem = -1;
}

CItemComboBox::CItemComboBox(CListCtrl *pList, int nItem, int nSubItem, CMapStringToString *pMapStr/* = NULL*/, int nCurSel/* = -1*/)
{
	m_pList = pList;
	m_nItem = nItem;
	m_nSubItem = nSubItem;
	Create();
	if ( pMapStr != NULL )
		SetStringMap( *pMapStr, nCurSel );
}

void CItemComboBox::SetListCtrl(CListCtrl *pList, int nItem, int nSubItem)
{
	m_pList = pList;
	m_nItem = nItem;
	m_nSubItem = nSubItem;
}

CItemComboBox::~CItemComboBox()
{
}


BEGIN_MESSAGE_MAP(CItemComboBox, CComboBox)
	ON_WM_KILLFOCUS()
END_MESSAGE_MAP()


void CItemComboBox::OnKillFocus(CWnd* pNewWnd)
{
	CComboBox::OnKillFocus(pNewWnd);
	if ( m_pList != NULL )
	{
		CString strText;
		CString strValue;
		int nCurSel = GetCurSel();
		if (nCurSel != CB_ERR)
		{
			GetLBText( nCurSel, strText );
			if ( m_mapStr.Lookup( strText, strValue ) )
			{
				m_pList->SetItemText( m_nItem, m_nSubItem, strValue );
			}
		}
		m_pList->Invalidate();
	}
	delete this;
}

BOOL CItemComboBox::Create()
{
	CRect rect;
	int nHeight = 12;// default value
	if ( m_pList != NULL )
	{
		m_pList->GetSubItemRect( m_nItem, m_nSubItem, LVIR_BOUNDS, rect );
		nHeight = rect.Height() - 2;
		rect.bottom += 80;
		// if the m_nSubItem == 0, the rect will be the whole row's rect. Code below would avoid this case
		rect.right = rect.left + m_pList->GetColumnWidth( m_nSubItem );
	}
	BOOL bRet = CComboBox::Create( WS_CHILD | WS_VISIBLE | CBS_DROPDOWNLIST | CBS_AUTOHSCROLL, rect, m_pList, 0x1234 );
	TRACE1( _T("Height: %d\r\n"), nHeight );
	m_font.CreateFont(
		nHeight,                   // nHeight
		0,                         // nWidth
		0,                         // nEscapement
		0,                         // nOrientation
		FW_NORMAL,                 // nWeight
		FALSE,                     // bItalic
		FALSE,                     // bUnderline
		0,                         // cStrikeOut
		ANSI_CHARSET,              // nCharSet
		OUT_DEFAULT_PRECIS,        // nOutPrecision
		CLIP_DEFAULT_PRECIS,       // nClipPrecision
		DEFAULT_QUALITY,           // nQuality
		DEFAULT_PITCH | FF_SWISS,  // nPitchAndFamily
		"Arial");
	SetFont( &m_font );
	SetFocus();
	return bRet;
}

void CItemComboBox::SetStringMap(CMapStringToString &mapStr, int nCurSel/* = -1*/)
{
	POSITION pos = mapStr.GetStartPosition();
	CString strKey, strValue;
	CString & strText = m_pList->GetItemText( m_nItem, m_nSubItem );
	m_mapStr.RemoveAll();
	int nMatchSel = 0, nIndex = 0;
	while ( pos != NULL )
	{
		mapStr.GetNextAssoc( pos, strKey, strValue );// copy from mapStr, if reserve the pointer, ItemComboBox would not keep independent
		m_mapStr.SetAt( strKey, strValue );
		if ( strText == strValue )// find the last match item
			nMatchSel = nIndex;
		InsertString( nIndex++, strKey );// strKey: show in the combobox, strValue: show in the list ctrl
	}
	if ( nCurSel == -1 )
	{
		SetCurSel( nMatchSel );
	}
	else
	{
		SetCurSel( nCurSel );
	}
}