Mastering Visual Basic 6/mastvb6.iso/leadtools/ocx32.lt/RESIZEDL.CPP

C/C++ Source or Header | 1996-07-10 | 5.3 KB | 195 lines

// resizedl.cpp : implementation file
// Copyright (C) 1996 LEAD Technologies, Inc.
// All rights reserved.

#include "stdafx.h"
#include "mfcdemo.h"
#include "resizedl.h"

#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CResizeDlg dialog


CResizeDlg::CResizeDlg(CWnd* pParent /*=NULL*/)
    : CDialog(CResizeDlg::IDD, pParent)
{
    //{{AFX_DATA_INIT(CResizeDlg)
    m_nWidth = 0;
    m_nHeight = 0;
        m_nOrgWidth = 0;
        m_nOrgHeight = 0;
    m_fResample = FALSE;
        m_nMin = 1;
        m_nMax = 16384;
        m_nStep = 10;
        m_nPage = 100;
    m_fAspect = TRUE;
    //}}AFX_DATA_INIT
}


void CResizeDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(CResizeDlg)
    DDX_Control(pDX, IDC_SCROLLBAR2, m_ScrollBar2);
    DDX_Control(pDX, IDC_SCROLLBAR1, m_ScrollBar1);
    DDX_Text(pDX, IDC_EDIT1, m_nWidth);
    DDV_MinMaxInt(pDX, m_nWidth, m_nMin, m_nMax);
    DDX_Text(pDX, IDC_EDIT2, m_nHeight);
    DDV_MinMaxInt(pDX, m_nHeight, m_nMin, m_nMax);
    DDX_Check(pDX, IDC_CHECK2, m_fResample);
    DDX_Check(pDX, IDC_CHECK1, m_fAspect);
    //}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CResizeDlg, CDialog)
    //{{AFX_MSG_MAP(CResizeDlg)
    ON_EN_CHANGE(IDC_EDIT1, OnChangeEdit1)
    ON_EN_CHANGE(IDC_EDIT2, OnChangeEdit2)
    ON_WM_HSCROLL()
    ON_BN_CLICKED(IDC_CHECK1, OnCheck1)
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()


BOOL CResizeDlg::GetValue(LPINT pValue, int nEditID, int nMin, int nMax)
{
        BOOL fTranslated;
        int n;
        n = GetDlgItemInt (nEditID, &fTranslated, TRUE);
        if (!fTranslated || n < nMin || n > nMax)
                return(FALSE);
        *pValue = n;
        return(TRUE);
}

void CResizeDlg::SetValue(int nValue, int nEditID, CScrollBar *pScrollBar)
{
        pScrollBar->SetScrollPos(nValue);
        SetDlgItemInt (nEditID, nValue, TRUE);
}

void CResizeDlg::DoScroll(LPINT pValue, UINT nSBCode, UINT nPos, int nMin, int nMax, int nStep, int nPage)
{
      switch (nSBCode)
      {
      case SB_LEFT:
         *pValue = nMin;
         break;
      case SB_RIGHT:
         *pValue = nMax;
         break;
      case SB_THUMBPOSITION:
      case SB_THUMBTRACK:
         *pValue = (int) nPos;
         break;
      case SB_LINELEFT:
         *pValue = max (*pValue - nStep, nMin);
         break;
      case SB_LINERIGHT:
         *pValue = min (*pValue + nStep, nMax);
         break;
      case SB_PAGELEFT:
         *pValue = max (*pValue - nPage, nMin);
         break;
      case SB_PAGERIGHT:
         *pValue = min (*pValue + nPage, nMax);
         break;
      }
}

/////////////////////////////////////////////////////////////////////////////
// CResizeDlg message handlers

void CResizeDlg::OnChangeEdit1()
{
      if(GetValue(&m_nWidth, IDC_EDIT1, m_nMin, m_nMax))
      {
                m_ScrollBar1.SetScrollPos(m_nWidth);
                if(m_fAspect)
                {
                  m_fAspect = FALSE;
                  m_nHeight = MulDiv(m_nWidth, m_nOrgHeight, m_nOrgWidth);
                  SetValue(m_nHeight, IDC_EDIT2, &m_ScrollBar2);
                  m_fAspect = TRUE;
                }
      }
}

void CResizeDlg::OnChangeEdit2()
{
      if(GetValue(&m_nHeight, IDC_EDIT2, m_nMin, m_nMax))
      {
                m_ScrollBar2.SetScrollPos(m_nHeight);
                if(m_fAspect)
                {
                  m_fAspect = FALSE;
                  m_nWidth = MulDiv(m_nHeight, m_nOrgWidth, m_nOrgHeight);
                  SetValue(m_nWidth, IDC_EDIT1, &m_ScrollBar1);
                  m_fAspect = TRUE;
                }
     }
}



void CResizeDlg::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{

      if(pScrollBar->GetDlgCtrlID() == IDC_SCROLLBAR1)
      {
         GetValue(&m_nWidth, IDC_EDIT1, m_nMin, m_nMax);
         DoScroll(&m_nWidth, nSBCode, nPos, m_nMin, m_nMax, m_nStep, m_nPage);
         SetValue(m_nWidth, IDC_EDIT1, pScrollBar);
         if(m_fAspect)
         {
            m_nHeight = MulDiv(m_nWidth, m_nOrgHeight, m_nOrgWidth);
            SetValue(m_nHeight, IDC_EDIT2, &m_ScrollBar2);
         }
      }
      else
      {
         GetValue(&m_nHeight, IDC_EDIT2, m_nMin, m_nMax);
         DoScroll(&m_nHeight, nSBCode, nPos, m_nMin, m_nMax, m_nStep, m_nPage);
         SetValue(m_nHeight, IDC_EDIT2, pScrollBar);
         if(m_fAspect)
         {
            m_nWidth = MulDiv(m_nHeight, m_nOrgWidth, m_nOrgHeight);
            SetValue(m_nWidth, IDC_EDIT1, &m_ScrollBar1);
         }
      }
}

void CResizeDlg::OnCheck1()
{
        m_fAspect = !m_fAspect;
        if(m_fAspect)
        {
           m_nHeight = MulDiv(m_nWidth, m_nOrgHeight, m_nOrgWidth);
           SetValue(m_nHeight, IDC_EDIT2, &m_ScrollBar2);
        }
}


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

        m_nOrgWidth = m_nWidth;
        m_nOrgHeight = m_nHeight;
        m_ScrollBar1.SetScrollRange(m_nMin, m_nMax, TRUE);
        m_ScrollBar1.SetScrollPos(m_nWidth);
        m_ScrollBar2.SetScrollRange(m_nMin, m_nMax, TRUE);
        m_ScrollBar2.SetScrollPos(m_nHeight);

    return TRUE;  // return TRUE unless you set the focus to a control
                  // EXCEPTION: OCX Property Pages should return FALSE
}