transparentwindowdlg.cpp

对窗体的一点认识 不知道具体的功能还有什么 希望大家给予帮忙

// TransparentWindowDlg.cpp : implementation file
//

#include "stdafx.h"
#include "TransparentWindow.h"
#include "TransparentWindowDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CTransparentWindowDlg dialog

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

BEGIN_MESSAGE_MAP(CTransparentWindowDlg, CDialog)
	//{{AFX_MSG_MAP(CTransparentWindowDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_WM_ERASEBKGND()
	ON_WM_NCHITTEST()
	ON_WM_SHOWWINDOW()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CTransparentWindowDlg message handlers

BOOL CTransparentWindowDlg::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
	
	// TODO: Add extra initialization here
	SetupRegion();
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CTransparentWindowDlg::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 CTransparentWindowDlg::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 CTransparentWindowDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CTransparentWindowDlg::SetupRegion()
{
	CDC* pDC;
	CDC	 memDC;
	CBitmap	cBitmap;
	CBitmap* pOldMemBmp = NULL;
	COLORREF col;
	CRect cRect;
	int	x, y;
	CRgn wndRgn, rgnTemp;

	pDC = GetDC();
	GetWindowRect(&cRect);

	//将模板位图选进设备场景中
	cBitmap.LoadBitmap(IDB_MASK);
	memDC.CreateCompatibleDC(pDC);
	pOldMemBmp = memDC.SelectObject(&cBitmap);

	//创建模板形状的不规则区域
	wndRgn.CreateRectRgn(0, 0, cRect.Width(), cRect.Height());
	for(x=0; x<=cRect.Width(); x++)
	{
		for(y=0; y<=cRect.Height(); y++)
		{
			//将位图中黑色小圆洞对应的区域抠掉
			col = memDC.GetPixel(x, y);
			if(col == 0)
			{
				rgnTemp.CreateRectRgn(x, y, x+1, y+1);
				wndRgn.CombineRgn(&wndRgn, &rgnTemp, RGN_XOR);
				rgnTemp.DeleteObject();	
			}
		}
	}
	if (pOldMemBmp) memDC.SelectObject(pOldMemBmp);

	//将不规则区域分配给窗体，也就是创建不规则的窗体
	SetWindowRgn((HRGN)wndRgn, TRUE);
	ReleaseDC(pDC);
}

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

	CDC memDC;
	CBitmap			cBitmap;
	CBitmap*		pOldMemBmp = NULL;

	//将背景位图加到设备场景中
	cBitmap.LoadBitmap(IDB_BACK);
	memDC.CreateCompatibleDC(pDC);
	pOldMemBmp = memDC.SelectObject(&cBitmap);

	//将背景位图显示出来
	pDC->BitBlt(0, 0, rect.Width(), rect.Height(), &memDC, 0, 0, SRCCOPY);
	if (pOldMemBmp) memDC.SelectObject( pOldMemBmp );
	
	return TRUE;
//	return CDialog::OnEraseBkgnd(pDC);
}


UINT CTransparentWindowDlg::OnNcHitTest(CPoint point) 
{
	UINT nHitTest = CDialog::OnNcHitTest(point); 

    return (nHitTest == HTCLIENT)? HTCAPTION:nHitTest;
}

void CTransparentWindowDlg::OnShowWindow(BOOL bShow, UINT nStatus) 
{
	CDialog::OnShowWindow(bShow, nStatus);

	//调整窗体大小，适应位图大小
	CRect rc;
	GetClientRect(&rc);
	rc.right = rc.left + 320;
	rc.bottom = rc.top + 150;
	MoveWindow(&rc,TRUE);
}