scrolldlg.cpp

来自「计算机图形学电子教案 上传者来自 兰州交通大学」· C++ 代码 · 共 136 行

// ScrollDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Ex_CommCtrls.h"
#include "ScrollDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CScrollDlg dialog


CScrollDlg::CScrollDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CScrollDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CScrollDlg)
	m_RValue = 0;
	m_GValue = 0;
	m_BValue = 0;
	m_bEditOK=FALSE;
	//}}AFX_DATA_INIT
}


void CScrollDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CScrollDlg)
	DDX_Control(pDX, IDC_SPIN1, m_Spin);
	DDX_Control(pDX, IDC_SLIDER1, m_Slider);
	DDX_Control(pDX, IDC_SCROLLBAR1, m_Scroll);
	DDX_Text(pDX, IDC_EDIT1, m_RValue);
	DDV_MinMaxInt(pDX, m_RValue, 0, 255);
	DDX_Text(pDX, IDC_EDIT2, m_GValue);
	DDV_MinMaxInt(pDX, m_GValue, 0, 255);
	DDX_Text(pDX, IDC_EDIT3, m_BValue);
	DDV_MinMaxInt(pDX, m_BValue, 0, 255);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CScrollDlg, CDialog)
	//{{AFX_MSG_MAP(CScrollDlg)
	ON_EN_CHANGE(IDC_EDIT1, OnChangeEdit)
	ON_EN_CHANGE(IDC_EDIT2, OnChangeEdit)
	ON_EN_CHANGE(IDC_EDIT3, OnChangeEdit)
	ON_WM_HSCROLL()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CScrollDlg message handlers

void CScrollDlg::OnChangeEdit() 
{
	// TODO: If this is a RICHEDIT control, the control will not
	// send this notification unless you override the CDialog::OnInitDialog()
	// function and call CRichEditCtrl().SetEventMask()
	// with the ENM_CHANGE flag ORed into the mask.
	
	// TODO: Add your control notification handler code here
	if(!m_bEditOK) return;
	UpdateData();
	m_Scroll.SetScrollPos(m_RValue);
	m_Slider.SetPos(m_GValue);
	Draw();
}

BOOL CScrollDlg::OnInitDialog() 
{
	CDialog::OnInitDialog();
	
	// TODO: Add extra initialization here
	//设置滚动条和滑动条的范围及当前位置
	m_Scroll.SetScrollRange(0,255);
	m_Scroll.SetScrollPos(m_RValue);
	m_Slider.SetRange(0,255);
	m_Slider.SetPos(m_GValue);
	//设置旋转按钮的范围
	m_Spin.SetRange(0,255);
	UpdateData(FALSE);//将数据传给控件
	m_bEditOK = TRUE;
	
	return TRUE;  // return TRUE unless you set the focus to a control
	              // EXCEPTION: OCX Property Pages should return FALSE
}

void CScrollDlg::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) 
{
	// TODO: Add your message handler code here and/or call default
	int nID = pScrollBar -> GetDlgCtrlID();
	if(nID == IDC_SLIDER1)   //使滑动条产生水平滚动消息
	{
		m_GValue = m_Slider.GetPos();  //获得滑动条当前的位置
	}
    if(nID == IDC_SCROLLBAR1)      //使滚动条产生水平滚动消息
	{
		switch(nSBCode)
		{
		       case SB_LINELEFT:m_RValue--;    break;
			   case SB_LINERIGHT:m_RValue++;    break;
               case SB_PAGELEFT:m_RValue-=10;    break;
			   case SB_PAGERIGHT:m_RValue+=10;    break;
			   case SB_THUMBTRACK:m_RValue=nPos;    break;
		}
		if(m_RValue<0) m_RValue = 0;
		if(m_RValue>255) m_RValue = 255;
		m_Scroll.SetScrollPos(m_RValue);

	}
	UpdateData(FALSE);
	Draw();
	
	CDialog::OnHScroll(nSBCode, nPos, pScrollBar);
}

void CScrollDlg::Draw()
{   CWnd*  pWnd = GetDlgItem(IDC_DRAW);
    CDC*  pDC = pWnd->GetDC();  //获得窗口当前的设备环境指针
	CBrush drawBrush;    //定义画刷变量
	drawBrush.CreateSolidBrush(RGB(m_RValue,m_GValue,m_BValue));
	//创建一个填充色画刷
	//颜色分量转换成一个32位的RGB颜色值
	CBrush* pOldBrush = pDC ->SelectObject(&drawBrush);
	CRect rcClient;
	pWnd ->GetClientRect(rcClient);
	pDC ->Rectangle(rcClient);
	pDC ->SelectObject(pOldBrush);
     
}