exampledlg.cpp

C++编程的实际例子

// ExampleDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Example.h"
#include "ExampleDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CExampleDlg dialog

CExampleDlg::CExampleDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CExampleDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CExampleDlg)
		// 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 CExampleDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CExampleDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CExampleDlg, CDialog)
	//{{AFX_MSG_MAP(CExampleDlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_WM_ERASEBKGND()
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONDBLCLK()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CExampleDlg message handlers

BOOL CExampleDlg::OnInitDialog()
{
	CDialog::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
	CClientDC dc(this); 
	//用于绘制的设备上下文
	m_bmpDraw.DeleteObject();
	m_bmpDraw.LoadBitmap(IDB_BITMAP1);
	SetupRegion(&dc);
	
	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 CExampleDlg::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
	{
		CDialog::OnPaint();
	}
}

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

void CExampleDlg::SetupRegion(CDC *pDC)
{
	CDC			memDC;
	CBitmap			&cBitmap=m_bmpDraw;
	CBitmap*		pOldMemBmp = NULL;
	COLORREF		col,colMask;
	CRect			cRect;
	int				x, y;
	CRgn			wndRgn, rgnTemp;
	GetWindowRect(&cRect);
	CPoint ptOrg=cRect.TopLeft();
	BITMAP bmInfo;
	cBitmap.GetObject(sizeof(bmInfo),&bmInfo);
	CRect rcNewWnd=CRect(ptOrg,CSize(bmInfo.bmWidth,bmInfo.bmHeight));
	memDC.CreateCompatibleDC(pDC);
	pOldMemBmp = memDC.SelectObject(&cBitmap);
	colMask=memDC.GetPixel(0,0);
	wndRgn.CreateRectRgn(0, 0, rcNewWnd.Width(), rcNewWnd.Height());
	for(x=0; x<=rcNewWnd.Width(); x++)
	{
		for(y=0; y<=rcNewWnd.Height(); y++)
		{
			col = memDC.GetPixel(x, y);
			if(col == colMask)
			{
				rgnTemp.CreateRectRgn(x, y, x+1, y+1);
				wndRgn.CombineRgn(&wndRgn, &rgnTemp, RGN_XOR);
				rgnTemp.DeleteObject();	
			}
		}
	}
	memDC.SelectObject(pOldMemBmp);
	SetWindowRgn((HRGN)wndRgn, TRUE);
}

BOOL CExampleDlg::OnEraseBkgnd(CDC* pDC) 
{
	// TODO: Add your message handler code here and/or call default
	CRect	rect;
	GetWindowRect(&rect);
	CDC memDC;
	CBitmap			&cBitmap=m_bmpDraw;;
	CBitmap*		pOldMemBmp = NULL;

	memDC.CreateCompatibleDC(pDC);
	pOldMemBmp = memDC.SelectObject(&cBitmap);
	pDC->BitBlt(0, 0, rect.Width(), rect.Height(), &memDC, 0, 0, SRCCOPY);
	memDC.SelectObject( pOldMemBmp );
	return TRUE;	
//	return CDialog::OnEraseBkgnd(pDC);
}

void CExampleDlg::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	PostMessage(WM_NCLBUTTONDOWN, HTCAPTION,
		MAKELPARAM(point.x,point.y)); 	
	//实现无标题拖动
	CDialog::OnLButtonDown(nFlags, point);
}

void CExampleDlg::OnLButtonDblClk(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	DestroyWindow();
	CDialog::OnLButtonDblClk(nFlags, point);
}