demodlg.cpp

这是MFC经典问答书的光盘内容

// DemoDlg.cpp : implementation file
//

#include "stdafx.h"
#include "BackColor.h"
#include "DemoDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CDemoDlg dialog


CDemoDlg::CDemoDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CDemoDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CDemoDlg)
	m_nX = 0;
	m_nY = 0;
	m_nShape = -1;
	m_nBackColor = 0;
	//}}AFX_DATA_INIT

	// Set initial background color to cyan
	m_brBack.CreateSolidBrush( RGB( 0, 255, 255 ) );
}


void CDemoDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CDemoDlg)
	DDX_Control(pDX, IDC_SHAPE, m_cmbShape);
	DDX_Control(pDX, IDC_Y, m_edtY);
	DDX_Control(pDX, IDC_X, m_edtX);
	DDX_Text(pDX, IDC_X, m_nX);
	DDX_Text(pDX, IDC_Y, m_nY);
	DDX_CBIndex(pDX, IDC_SHAPE, m_nShape);
	DDX_Radio(pDX, IDC_CYAN, m_nBackColor);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CDemoDlg, CDialog)
	//{{AFX_MSG_MAP(CDemoDlg)
	ON_WM_CTLCOLOR()
	ON_BN_CLICKED(IDC_CYAN, OnBackgroundCyan)
	ON_BN_CLICKED(IDC_YELLOW, OnBackgroundYellow)
	ON_BN_CLICKED(IDC_FUSCHIA, OnBackgroundFuschia)
	ON_BN_CLICKED(IDC_STANDARD, OnBackgroundStandard)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDemoDlg message handlers

HBRUSH CDemoDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) 
{
	switch( nCtlColor )
	{
	case CTLCOLOR_BTN:
	case CTLCOLOR_STATIC:
		pDC->SetBkMode( TRANSPARENT );
		// Fall through

	case CTLCOLOR_DLG:
		return static_cast<HBRUSH>( m_brBack.GetSafeHandle() );
	}
	
	return CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
}


void CDemoDlg::OnBackgroundCyan() 
{
   // 1 - Change the background color to cyan
   m_brBack.DeleteObject();
   m_brBack.CreateSolidBrush( RGB( 0, 255, 255 ) );

   // 2 - Force the dialog to repaint
   Invalidate( TRUE );
}

void CDemoDlg::OnBackgroundYellow() 
{
   // 1 - Change the background color to yellow
   m_brBack.DeleteObject();
   m_brBack.CreateSolidBrush( RGB( 255, 255, 0 ) );

   // 2 - Force the dialog to repaint
   Invalidate( TRUE );
}

void CDemoDlg::OnBackgroundFuschia() 
{
   // 1 - Change the background color to fuschia
   m_brBack.DeleteObject();
   m_brBack.CreateSolidBrush( RGB( 255, 0, 255 ) );

   // 2 - Force the dialog to repaint
   Invalidate( TRUE );
}

void CDemoDlg::OnBackgroundStandard() 
{
   // 1 - Change the background color to the standard background color
   m_brBack.DeleteObject();
   m_brBack.CreateSolidBrush( ::GetSysColor( COLOR_BTNFACE ) );

   // 2 - Force the dialog to repaint
   Invalidate( TRUE );
}