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Posted 6 Jun 2002

Tile, center and stretch a bitmap as your MFC dialog background

, 6 Jun 2002
A small CDialog derived class that helps avoid frequent copy/pasting of the same code, when using a bitmap as dialog background
// BitmapDialogDlg.cpp : implementation file
//

#include "stdafx.h"
#include "BitmapDialog.h"
#include "BitmapDialogDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CBitmapDialogDlg dialog

CBitmapDialogDlg::CBitmapDialogDlg(CWnd* pParent /*=NULL*/)
	: CBDialog(CBitmapDialogDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CBitmapDialogDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CBitmapDialogDlg::DoDataExchange(CDataExchange* pDX)
{
	CBDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CBitmapDialogDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CBitmapDialogDlg, CBDialog)
	//{{AFX_MSG_MAP(CBitmapDialogDlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnTile)
	ON_BN_CLICKED(IDC_BUTTON2, OnCenter)
	ON_BN_CLICKED(IDC_BUTTON3, OnStretch)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CBitmapDialogDlg message handlers

BOOL CBitmapDialogDlg::OnInitDialog()
{
	CBDialog::OnInitDialog();

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	SetBitmapStyle(StyleTile);
	SetBitmap(IDB_BITMAP1);
	return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CBitmapDialogDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CBDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CBitmapDialogDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CBitmapDialogDlg::OnTile() 
{
	SetBitmapStyle(StyleTile);
	Invalidate();
}

void CBitmapDialogDlg::OnCenter() 
{
	SetBitmapStyle(StyleCenter);
	Invalidate();
	
}

void CBitmapDialogDlg::OnStretch() 
{
	SetBitmapStyle(StyleStretch);
	Invalidate();
}

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About the Author

Nish Nishant
United States United States
Nish Nishant is the Principal Software Architect/Consultant for Ganymede Software Solutions LLC, and is based out of Columbus, Ohio. He has over 17 years of software industry experience in various roles including Lead Software Architect, Principal Software Engineer, and Product Manager. Nish was a Microsoft Visual C++ MVP between 2002 and 2015.

Nish is an industry acknowledged expert in the Microsoft technology stack. He authored C++/CLI in Action for Manning Publications in 2005, and had previously co-authored Extending MFC Applications with the .NET Framework for Addison Wesley in 2003. In addition, he has over 140 published technology articles on CodeProject.com and another 250+ blog articles on his WordPress blog. Nish is vastly experienced in team management, mentoring teams, and directing all stages of software development.

Contact Nish : If you are interested in hiring Nish as a consultant, you can reach him via his google email id voidnish.

Company Website : www.ganymedesoftwaresolutions.com

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