Visual C++ and MFC Programming 2nd Edition

Chapter 5: The Document/View Architecture Visual C++ and MFC Fundamentals

CFrameWnd::OnActivate(nState, pWndOther, bMinimized);

// TODO: Add your message handler code here

switch( nState )

{

case WA_ACTIVE:

MessageBox("This window has been activated, without the mouse!");

break;

case WA_INACTIVE:

MessageBox("This window has been deactivated and cannot be

changed now!!");

break;

case WA_CLICKACTIVE:

MessageBox("This window has been activated using the mouse!!!");

break;

}

}

void CMainFrame::OnPaint()

{

CFrameWnd::OnPaint();

MessageBox("The window has been painted<==>");

}

BOOL CExerciseApp::InitInstance()

{

m_pMainWnd = new CMainFrame ;

m_pMainWnd->ShowWindow(SW_SHOW);

m_pMainWnd->UpdateWindow();

return TRUE;

}

CExerciseApp theApp;

2. Test the application and return to MSVC

4.2.5 Window Sizing.....................................................................................

WM_SIZE: When using an application, one of the actions a user can perform on a

window is to change its size, provided the window allows this. Also, some time to time, if

the window allows it, the user can minimize, maximize, or restore a window. Whenever

any of these actions occur, the operating system must keep track of the size of a window.

When the size of a window has changed, the window sends the ON_WM_SIZE message.

Its syntax is:

afx_msg void OnSize(UINT nType, int cx, int cy);

The nType argument specifies what type of action to take. It can have one of the

following values:

Value Description

SIZE_MINIMIZED The window has been minimized

SIZE_MAXIMIZED The window has been maximized

SIZE_RESTORED The window has been restored from being maximized or