childfrm.cpp

这是书上的代码

// ChildFrm.cpp : implementation of the CChildFrame class
//

#include "stdafx.h"
#include "ImageOperation.h"
#include "MainFrm.h"
#include "ImageOperationDoc.h"
#include "ImageOperationView.h"

#include "ChildFrm.h"

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

/////////////////////////////////////////////////////////////////////////////
// CChildFrame

IMPLEMENT_DYNCREATE(CChildFrame, CMDIChildWnd)

BEGIN_MESSAGE_MAP(CChildFrame, CMDIChildWnd)
	//{{AFX_MSG_MAP(CChildFrame)
	ON_WM_GETMINMAXINFO()
	ON_WM_SETFOCUS()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CChildFrame construction/destruction

CChildFrame::CChildFrame()
{

	m_pImageObject=NULL;
	m_nWidth = 300;
	m_nHeight = 150;

}

CChildFrame::~CChildFrame()
{
}

BOOL CChildFrame::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs
    
	return CMDIChildWnd::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CChildFrame diagnostics

#ifdef _DEBUG
void CChildFrame::AssertValid() const
{
	CMDIChildWnd::AssertValid();
}

void CChildFrame::Dump(CDumpContext& dc) const
{
	CMDIChildWnd::Dump(dc);
}

#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CChildFrame message handlers

void CChildFrame::OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI) 
{

	lpMMI->ptMinTrackSize.x = lpMMI->ptMinTrackSize.y = 40;
	lpMMI->ptMaxTrackSize.x =
		m_nWidth +
		::GetSystemMetrics( SM_CXBORDER ) * 2 +
		::GetSystemMetrics( SM_CXFRAME ) * 2 + 2;
	lpMMI->ptMaxTrackSize.y =
		m_nHeight +
		::GetSystemMetrics( SM_CYBORDER ) * 2 +
		::GetSystemMetrics( SM_CYFRAME ) * 2 +
		::GetSystemMetrics( SM_CYCAPTION ) + 2;
	
	CMDIChildWnd::OnGetMinMaxInfo(lpMMI);
}



void CChildFrame::OnSetFocus(CWnd* pOldWnd) 
{
	CMDIChildWnd::OnSetFocus(pOldWnd);
	
	// TODO: Add your message handler code here
	CImageOperationDlg* pdlg;
	pdlg = ((CMainFrame*)AfxGetMainWnd())->m_pmodeless;

	if(pdlg)
	{
		pdlg->Invalidate();
	}
}