nlistbox.cpp

EVC环境下用SDK开发WINCE的应用程序

// NListBox.cpp: implementation of the CNListBox class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "NListBox.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CNListBox::CNListBox()
{
	SetMemWindow(FALSE);
}

CNListBox::~CNListBox()
{

}


BOOL CNListBox::Create(LPCTSTR lpszCaption, DWORD dwStyle,
		const RECT& rect, CNWnd* pParentWnd, UINT nID)
{
	CNWnd* pWnd = this;
	return pWnd->Create(_T("LISTBOX"), lpszCaption, dwStyle, rect, pParentWnd, nID);
}

void CNListBox::OnDrawItem(int /*nIDCtl*/, LPDRAWITEMSTRUCT lpdis)
{
	const int MAX_TEXT_LENGTH = 255;
	TCHAR		tchBuffer[MAX_TEXT_LENGTH] = {0,};
	int			y;
	TEXTMETRIC	tm; 

	// Display the text associated with the item. 
	if(lpdis->itemID != -1)	// to be sure that it's not an empty item.
		GetItemText(lpdis->itemID, tchBuffer, MAX_TEXT_LENGTH);
	
	GetTextMetrics(lpdis->hDC, &tm); 
	
	y = (lpdis->rcItem.bottom + lpdis->rcItem.top - 
		tm.tmHeight) / 2; 
	
	int nOldMode;
	COLORREF crOldTextColor, crOldBkColor;
	if (lpdis->itemState & ODS_SELECTED) 
	{
		nOldMode		= ::SetBkMode(lpdis->hDC,TRANSPARENT);
		crOldTextColor	= ::SetTextColor(lpdis->hDC, LSITBOX_SELECTED_TXEXTCOLOR);
		crOldBkColor	=::SetBkColor(lpdis->hDC, LSITBOX_SELECTED_BKCOLOR);
	} else
	{
		crOldBkColor = ::SetBkColor(lpdis->hDC, LISTBOX_BKCOLOR);
	}

	ExtTextOut(lpdis->hDC, 
		3, 
		y, 
		ETO_OPAQUE,
		&lpdis->rcItem,
		tchBuffer, 
		_tcslen(tchBuffer),
		NULL); 

	if (lpdis->itemState & ODS_SELECTED) 
	{
		SetBkMode(lpdis->hDC,nOldMode);
		SetTextColor(lpdis->hDC, crOldTextColor);
	}
	SetBkColor(lpdis->hDC, crOldBkColor);

}

BOOL CNListBox::OnEraseBkgnd(HDC hdc)
{
	RECT rect;
	// it's not mem window, don't call member function GetClientRect()
	::GetClientRect(GetSafeHwnd(), &rect);

	FillSolidRect(hdc, &rect, LISTBOX_BKCOLOR);
	return TRUE;
}

void CNListBox::PreSubclassWindow()
{
	CNCtrl::PreSubclassWindow();

	DWORD dwStyle = ::GetWindowLong(GetSafeHwnd(), GWL_STYLE);
//	dwStyle = dwStyle | LBS_OWNERDRAWFIXED;
	SetWindowLong(GetSafeHwnd(), GWL_STYLE, dwStyle);
}

int CNListBox::GetItemText( int nItem, LPTSTR lpszText, int nLen ) const
{
	TCHAR *pBuffer;
	LONG nTextLength;


	nTextLength = SendMessage(LB_GETTEXTLEN, (WPARAM)nItem, 0);
	ASSERT(nTextLength != LB_ERR);

	pBuffer = (TCHAR*)malloc((nTextLength+1)*sizeof(TCHAR));

	SendMessage(LB_GETTEXT, (WPARAM)nItem, (LPARAM)pBuffer);

	_tcsncpy(lpszText, pBuffer, nLen);
	lpszText[nLen - 1] = (TCHAR)0;	// null terminate

	free(pBuffer);
	return nTextLength;
}

void CNListBox::AddItem(LPCTSTR lpstr, DWORD uItemData)
{
    int nItem; 
 
    nItem = SendMessage(LB_ADDSTRING, 0, (LPARAM)lpstr); 
    //SendMessage(LB_SETITEMDATA, (WPARAM)nItem, (LPARAM)uItemData); 
	SetItemData(nItem, uItemData);
}

LRESULT CNListBox::WndProc(HWND hWnd,
		UINT uMsg, WPARAM wParam, LPARAM lParam)
{

	static int i = 0;
/*	if( uMsg!=0x180 && uMsg!=0x189 && uMsg!= 0x18a && uMsg!= 0x200 && uMsg!=0x84
		&& uMsg!=0x20 && uMsg!=0x2b)
		TRACE(_T("%d uMsg = %x\n"), i++, uMsg);
*/

	return CNCtrl::WndProc(hWnd, uMsg, wParam, lParam);
}


int CNListBox::SetCurSel(int nSelect) const
{
    int nItem; 
 
    nItem = SendMessage(LB_SETCURSEL, (WPARAM)nSelect, (LPARAM)0); 
    return nItem;
}

int CNListBox::GetCurSel( ) const
{
	return SendMessage(LB_GETCURSEL, (WPARAM)0, (LPARAM)0); 
}

int CNListBox::GetCount( ) const
{
	return SendMessage(LB_GETCOUNT, (WPARAM)0, (LPARAM)0); 
}

// return LB_ERR if an error occurs.
int CNListBox::SetItemData ( int nIndex, DWORD dwItemData )
{
	return SendMessage(LB_SETITEMDATA, (WPARAM)nIndex, (LPARAM)dwItemData); 
}

// The return value is the value associated with the item, 
// or LB_ERR if an error occurs.
DWORD CNListBox::GetItemData( int nIndex ) const
{
	return SendMessage(LB_GETITEMDATA, (WPARAM)nIndex, (LPARAM)0); 
}