www.gusucode.com > VC++ 20个窗体编程实例源码源码程序 > VC++ 20个窗体编程实例源码源码程序/code/1.16 如何实现图片窗口/Demo/DemoDlg.cpp

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// DemoDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Demo.h"
#include "DemoDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

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

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

BEGIN_MESSAGE_MAP(CDemoDlg, CDialog)
	//{{AFX_MSG_MAP(CDemoDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_WM_ERASEBKGND()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

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

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

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// 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

	CRect rect;
	GetWindowRect(&rect);

	//加载位图
	CBitmap bmp;
	bmp.LoadBitmap(IDB_BITMAP);

	//将位图选入设备环境
	CDC dc;
	CDC* pDC = GetDC();
	dc.CreateCompatibleDC(pDC);
	dc.SelectObject(&bmp);

	//将位图中黑色区域变成透明区域
	CRgn rgn1;
	rgn1.CreateRectRgn(0, 0, rect.Width(), rect.Height());
	for (int x = 0; x < rect.Width(); x++)
	{
		for(int y = 0; y < rect.Height(); y++)
		{
			COLORREF cr = dc.GetPixel(x, y);
			if (cr == RGB(0, 0, 0))
			{
				CRgn rgn2;
				rgn2.CreateRectRgn(x, y, x+1, y+1);
				rgn1.CombineRgn(&rgn1, &rgn2, RGN_XOR);
			}
		}
	}

	//设置窗口区域
	SetWindowRgn((HRGN)rgn1, TRUE);

	ReleaseDC(pDC);

	return TRUE;
}

void CDemoDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// 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 CDemoDlg::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 CDemoDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

BOOL CDemoDlg::OnEraseBkgnd(CDC* pDC) 
{
	CRect rect;
	GetWindowRect(&rect);

	CBitmap bmp;
	bmp.LoadBitmap(IDB_BITMAP);

	CDC dc;
	dc.CreateCompatibleDC(pDC);
	dc.SelectObject(&bmp);

	pDC->BitBlt(0, 0, rect.Width(), rect.Height(), &dc, 0, 0, SRCCOPY);

	return TRUE;
//	return CDialog::OnEraseBkgnd(pDC);
}