adjustsizedlg.cpp

一个国人自己实现图像库的程序（有参考价值）

// AdjustSizeDlg.cpp : implementation file
//

#include "stdafx.h"
#include "picviewer.h"
#include "AdjustSizeDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CAdjustSizeDlg dialog


CAdjustSizeDlg::CAdjustSizeDlg(CWnd* pParent, FCDibEffect * dib)
	: CDialog(CAdjustSizeDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CAdjustSizeDlg)
	//}}AFX_DATA_INIT
	m_pOriDib = dib ;
	FCImage		bk ;
	bk.LoadJpeg (MAKEINTRESOURCE (JPG_BACKGROUND), _T("JPG")) ;
	m_BkBrush = ::CreatePatternBrush (bk.GetHandle ()) ;
}
CAdjustSizeDlg::~CAdjustSizeDlg ()
{
	::DeleteObject (m_BkBrush) ;
}

void CAdjustSizeDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAdjustSizeDlg)
	DDX_Control(pDX, IDC_SIZE_RATIO, m_btRatio);
	DDX_Control(pDX, IDC_EDIT_WIDTH, m_editPerWidth);
	DDX_Control(pDX, IDC_SIZE_WIDTH, m_staShowWidth);
	DDX_Control(pDX, IDC_SIZE_HEIGHT, m_staShowHeight);
	DDX_Control(pDX, IDC_SCROLLBAR_WIDTH, m_sbarWidth);
	DDX_Control(pDX, IDC_SCROLLBAR_HEIGHT, m_sbarHeight);
	DDX_Control(pDX, IDC_EDIT_HEIGHT, m_editPerHeight);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CAdjustSizeDlg, CDialog)
	//{{AFX_MSG_MAP(CAdjustSizeDlg)
	ON_WM_CTLCOLOR()
	ON_WM_HSCROLL()
	ON_BN_CLICKED(IDC_SIZE_RATIO, OnSizeRatio)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CAdjustSizeDlg message handlers

HBRUSH CAdjustSizeDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) 
{
	HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
	
	// TODO: Change any attributes of the DC here
	if ((nCtlColor == CTLCOLOR_DLG) || (nCtlColor == CTLCOLOR_STATIC))
	{
		pDC->SetBkMode (TRANSPARENT) ;
		hbr = m_BkBrush ;
	}
	// TODO: Return a different brush if the default is not desired
	return hbr;
}

BOOL CAdjustSizeDlg::OnInitDialog() 
{
	CDialog::OnInitDialog();

	// TODO: Add extra initialization here
	m_sbarHeight.SetScrollRange (4, m_pOriDib->Height()*2, FALSE) ;
	m_sbarHeight.SetScrollPos (m_pOriDib->Height(), FALSE) ;
	CString		num ;
	num.Format (_T("%i"), m_pOriDib->Height()) ;
	m_staShowHeight.SetWindowText (num) ;
	m_editPerHeight.SetWindowText (_T("100")) ;

	m_sbarWidth.SetScrollRange (4, m_pOriDib->Width()*2, FALSE) ;
	m_sbarWidth.SetScrollPos (m_pOriDib->Width(), FALSE) ;
	num.Format (_T("%i"), m_pOriDib->Width()) ;
	m_staShowWidth.SetWindowText (num) ;
	m_editPerWidth.SetWindowText (_T("100")) ;
	
	return TRUE;  // return TRUE unless you set the focus to a control
	              // EXCEPTION: OCX Property Pages should return FALSE
}

void CAdjustSizeDlg::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) 
{
	//	Get Current Position
	if ((nSBCode != SB_THUMBPOSITION) && (nSBCode != SB_THUMBTRACK))
		nPos = pScrollBar->GetScrollPos () ;
	switch (nSBCode)
	{
		case SB_LINELEFT :
			nPos-- ; break ;
		case SB_LINERIGHT :
			nPos++ ; break ;
		case SB_PAGELEFT :
			nPos -= 5 ; break ;
		case SB_PAGERIGHT :
			nPos += 5 ; break ;
	}
	nPos = max (nPos, 4) ;
	CString		num ;

	switch (pScrollBar->GetDlgCtrlID ())
	{
		case IDC_SCROLLBAR_HEIGHT :
			nPos = min (nPos, m_pOriDib->Height()*2) ;
			if (this->m_btRatio.GetCheck () == 1)
			{
				UINT	nRatio = nPos*100 / m_pOriDib->Height() ;
				num.Format ("%i", nRatio) ;
				m_editPerHeight.SetWindowText (num) ;
				m_editPerWidth.SetWindowText (num) ;

				UINT	nNewWth = m_pOriDib->Width() * nRatio / 100 ;
				nNewWth = min (max (nNewWth, 4), m_pOriDib->Width()*2) ;
				m_sbarWidth.SetScrollPos (nNewWth) ;

				num.Format ("%i", nNewWth) ;
				m_staShowWidth.SetWindowText (num) ;
				num.Format ("%i", nPos) ;
				m_staShowHeight.SetWindowText (num) ;
			}
			else
			{
				num.Format ("%i", nPos) ;
				m_staShowHeight.SetWindowText (num) ;
				num.Format ("%i", nPos*100 / m_pOriDib->Height()) ;
				m_editPerHeight.SetWindowText (num) ;
			}
			break ;
		case IDC_SCROLLBAR_WIDTH :
			nPos = min (nPos, m_pOriDib->Width()*2) ;
			if (this->m_btRatio.GetCheck () == 1)
			{
				UINT	nRatio = nPos*100 / m_pOriDib->Width() ;
				num.Format ("%i", nRatio) ;
				m_editPerHeight.SetWindowText (num) ;
				m_editPerWidth.SetWindowText (num) ;

				UINT	nNewHgt = m_pOriDib->Height() * nRatio / 100 ;
				nNewHgt = min (max (nNewHgt, 4), m_pOriDib->Height()*2) ;
				m_sbarHeight.SetScrollPos (nNewHgt) ;

				num.Format ("%i", nNewHgt) ;
				m_staShowHeight.SetWindowText (num) ;
				num.Format ("%i", nPos) ;
				m_staShowWidth.SetWindowText (num) ;
			}
			else
			{
				num.Format ("%i", nPos) ;
				m_staShowWidth.SetWindowText (num) ;
				num.Format ("%i", nPos*100 / m_pOriDib->Width()) ;
				m_editPerWidth.SetWindowText (num) ;
			}
			break ;
	}
	pScrollBar->SetScrollPos (nPos) ;
	CDialog::OnHScroll(nSBCode, nPos, pScrollBar);
}

void CAdjustSizeDlg::OnSizeRatio() 
{
	// TODO: Add your control notification handler code here
	if (this->m_btRatio.GetCheck () == 1)
		this->SendMessage (WM_HSCROLL, (WPARAM)MAKELONG(SB_THUMBPOSITION, m_sbarWidth.GetScrollPos()), (LPARAM)m_sbarWidth.GetSafeHwnd()) ;
}

void CAdjustSizeDlg::OnOK() 
{
	// TODO: Add extra validation here
	if ((m_sbarWidth.GetScrollPos() != m_pOriDib->Width()) || (m_sbarHeight.GetScrollPos() != m_pOriDib->Height()))
		m_pOriDib->Stretch (m_sbarWidth.GetScrollPos(),
							m_sbarHeight.GetScrollPos(),
							(m_btRatio.GetCheck() == 1)) ;
	CDialog::OnOK();
}