brightness.cpp

Visual C++编程宝典随书光盘里的代码

// Brightness.cpp : implementation file
//

#include "stdafx.h"
#include "ProcessImage.h"
#include "Brightness.h"

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

/////////////////////////////////////////////////////////////////////////////
// CBrightness dialog


CBrightness::CBrightness(CWnd* pParent /*=NULL*/)
	: CDialog(CBrightness::IDD, pParent)
{
	//{{AFX_DATA_INIT(CBrightness)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	m_nBrightness = 101;
	strcpy( m_szTitle, "Set Brightness" );
	strcpy( m_szLabel, "Brightness" );
}


void CBrightness::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CBrightness)
	DDX_Control(pDX, IDC_SCROLLBAR1, m_BrightnessScroll);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CBrightness, CDialog)
	//{{AFX_MSG_MAP(CBrightness)
	ON_WM_VSCROLL()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CBrightness message handlers

void CBrightness::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) 
{

	switch( nSBCode ){
		case SB_THUMBPOSITION:
			m_nBrightness = nPos;
			m_BrightnessScroll.SetScrollPos( m_nBrightness, TRUE );
			UpdateBrightness();
			break;
		case SB_LINEDOWN:
			if( m_nBrightness < 200 ) m_nBrightness++, m_BrightnessScroll.SetScrollPos( m_nBrightness, TRUE );
			UpdateBrightness();
			break;
		case SB_LINEUP:
			if( m_nBrightness > 0 ) m_nBrightness--, m_BrightnessScroll.SetScrollPos( m_nBrightness, TRUE );
			UpdateBrightness();
			break;
		case SB_PAGEUP:
			if( m_nBrightness > 0 ){
				m_nBrightness -= 10;
				if( m_nBrightness < 0 ) m_nBrightness = 0;
				m_BrightnessScroll.SetScrollPos( m_nBrightness, TRUE );
				}
			UpdateBrightness();
			break;
		case SB_PAGEDOWN:
			if( m_nBrightness < 200 ){
				m_nBrightness += 10;
				if( m_nBrightness > 200 ) m_nBrightness = 200;
				m_BrightnessScroll.SetScrollPos( m_nBrightness, TRUE );
				}
			UpdateBrightness();
			break;
		}
	
	CDialog::OnVScroll(nSBCode, nPos, pScrollBar);
}

BOOL CBrightness::OnInitDialog() 
{
	CDialog::OnInitDialog();
	
	m_BrightnessScroll.SetScrollRange( 1, 200, FALSE );
	m_BrightnessScroll.SetScrollPos( 100, FALSE );
	UpdateBrightness();
	SetWindowText( m_szTitle );
	
	return TRUE;  // return TRUE unless you set the focus to a control
	              // EXCEPTION: OCX Property Pages should return FALSE
}

void CBrightness::OnOK() 
{

	m_nBrightness = 201 - m_BrightnessScroll.GetScrollPos();
	
	CDialog::OnOK();
}

void CBrightness::UpdateBrightness( void )
{
	char jnk[100];
	
	wsprintf( jnk, "%s:%d", m_szLabel, 201 - m_nBrightness );
	SetDlgItemText( IDC_BRIGHTNESSVALUE, jnk );
	
}