closesmoothlydlg.cpp

visual c++ 实例编程

// CloseSmoothlyDlg.cpp : implementation file
//

#include "stdafx.h"
#include "CloseSmoothly.h"
#include "CloseSmoothlyDlg.h"
#include <Windows.h>
#include <Winuser.h>
#define WS_EX_LAYERED	0x00080000
#define LWA_ALPHA		0x00000002
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
HMODULE		hUserDll ;

/////////////////////////////////////////////////////////////////////////////
// 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()

/////////////////////////////////////////////////////////////////////////////
// CCloseSmoothlyDlg dialog

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

BEGIN_MESSAGE_MAP(CCloseSmoothlyDlg, CDialog)
	//{{AFX_MSG_MAP(CCloseSmoothlyDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_WM_CLOSE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCloseSmoothlyDlg message handlers

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

	hUserDll = ::LoadLibrary(_T("USER32.dll"));
	//Change style to layered window style...
	::SetWindowLong(m_hWnd, GWL_EXSTYLE, ::GetWindowLong(m_hWnd, GWL_EXSTYLE) |  WS_EX_LAYERED );
	SetTransparent(m_hWnd, 0, 255 * 100/100 , LWA_ALPHA );

	// 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
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

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

// This function sets the transparency layered window by calling SetLayeredWindowAttributes API function.
BOOL CCloseSmoothlyDlg::SetTransparent(HWND hWnd, COLORREF crKey, BYTE bAlpha, DWORD dwFlags)
{
	BOOL	bRet = TRUE;
	typedef BOOL (WINAPI* lpfnSetTransparent)(HWND hWnd, COLORREF crKey, BYTE bAlpha, DWORD dwFlags);
	
	// Check that "USER32.dll" library has been loaded successfully...
	if ( hUserDll )
	{
		lpfnSetTransparent pFnSetTransparent  = NULL;
		pFnSetTransparent  = (lpfnSetTransparent)GetProcAddress(hUserDll, "SetLayeredWindowAttributes");
		if (pFnSetTransparent )
			bRet = pFnSetTransparent(hWnd, crKey, bAlpha, dwFlags);

		else 
			bRet = FALSE;
	} //if( hUserDll )

	return bRet;
} // End of SetTransparent function

void CCloseSmoothlyDlg::OnClose() 
{
	// Close window smoothly...
	CloseSmoothly();

	// Free user library...
	if ( hUserDll )	
		::FreeLibrary( hUserDll );
	
	CDialog::OnClose();
}

void CCloseSmoothlyDlg::CloseSmoothly()
{
	// Increase transparency one percent each time...
	for(int nPercent=100; nPercent >= 0 ;nPercent--)
		SetTransparent(m_hWnd, 0, 255 * nPercent/100, LWA_ALPHA);

}