listctrlhiddensb.cpp

修改别人的ListCtrl控件

// ListCtrlHiddenSB.cpp : implementation file
//

#include "stdafx.h"
#include "CListCtrlExample.h"
#include "ListCtrlHiddenSB.h"

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

/////////////////////////////////////////////////////////////////////////////
// CListCtrlHiddenSB

CListCtrlHiddenSB::CListCtrlHiddenSB()
{
	NCOverride=FALSE; //False as default...
	Who=SB_BOTH; //Default remove both...
}

CListCtrlHiddenSB::~CListCtrlHiddenSB()
{
}

BEGIN_MESSAGE_MAP(CListCtrlHiddenSB, CListCtrl)
	//{{AFX_MSG_MAP(CListCtrlHiddenSB)
	ON_WM_NCCALCSIZE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CListCtrlHiddenSB message handlers

//****************************************************************************************

void CListCtrlHiddenSB::HideScrollBars(int Type, int Which)
{
	if(Type==LCSB_CLIENTDATA) //This is the clientrect function
	{
		RECT ierect;
		int cxvs, cyvs;
		GetClientRect(&ierect); //Get client width and height

		cxvs = GetSystemMetrics (SM_CXVSCROLL); //Get the system metrics - VERT
		cyvs = GetSystemMetrics (SM_CYVSCROLL); //Get the system metrics - HORZ
		
		if(Which==SB_HORZ) cxvs=0; //Set VERT to zero when choosen HORZ
		if(Which==SB_VERT) cyvs=0; //Set HORZ to zero when choosen VERT

		//Here we set the position of the window to the clientrect + the size of the scrollbars
		SetWindowPos(NULL, ierect.left, ierect.top, ierect.right+cxvs, ierect.bottom+cyvs, SWP_NOMOVE | SWP_NOZORDER);

		//Her we modify the rect so the right part is subbed from the rect.
		if(Which==SB_BOTH||Which==SB_HORZ) ierect.bottom -= ierect.top;
		if(Which==SB_BOTH||Which==SB_VERT) ierect.right -= ierect.left;

		//Just to be safe that the left/top corner is 0...
		ierect.top = 0;
		ierect.left = 0;
		
		HRGN iehrgn = NULL; //This range is created base on which scrollbar that is going to be removed!

		//The -2 is probably a border of some kind that we also need to remove. I could not find any good
		//metrics that gave me an 2 as an answer. So insted we makes it static with -2.
		if(Which==SB_BOTH) iehrgn=CreateRectRgn (ierect.left, ierect.top, ierect.right-2, ierect.bottom-2);
		if(Which==SB_HORZ) iehrgn=CreateRectRgn (ierect.left, ierect.top, ierect.right, ierect.bottom-2);
		if(Which==SB_VERT) iehrgn=CreateRectRgn (ierect.left, ierect.top, ierect.right-2, ierect.bottom);
		
		//After the range has been made we add it...
		SetWindowRgn (iehrgn, TRUE);

		//Reset of NCOverride
		NCOverride=FALSE;
	}

	if(Type==LCSB_NCOVERRIDE) //This is the NcCalcSize override
	{
		NCOverride=TRUE; //Set to true, so we run the code on each OnNcCalcSize.
		Who=Which; //Selects which scrollbars to get hidden.
	}
}

//****************************************************************************************

void CListCtrlHiddenSB::OnNcCalcSize(BOOL bCalcValidRects, NCCALCSIZE_PARAMS FAR* lpncsp) 
{
	// TODO: Add your message handler code here and/or call default

	if(NCOverride==TRUE) //If the NCOverride is true we remove each time the CListCtrl calc its rect.
	{
		  if(Who==SB_HORZ) ModifyStyle(WS_HSCROLL ,0,0); //Just by modifing the style we remove the scrollbar
		  if(Who==SB_VERT) ModifyStyle(WS_VSCROLL,0,0);
		  if(Who==SB_BOTH) ModifyStyle(WS_HSCROLL | WS_VSCROLL,0,0);
	}

	CListCtrl::OnNcCalcSize(bCalcValidRects, lpncsp);
}

//****************************************************************************************