界面编程

开发平台：
Visual C++

CNTRITEM.CPP：源码内容
							// cntritem.h : interface of the CDrawItem class
//
// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1998 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.
#include "stdafx.h"
#include "drawcli.h"
#include "drawdoc.h"
#include "drawobj.h"
#include "drawvw.h"
#include "cntritem.h"
#include <AfxPriv.h>
#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CDrawItem implementation
IMPLEMENT_SERIAL(CDrawItem, COleClientItem, 0)
CDrawItem::CDrawItem(CDrawDoc* pContainer, CDrawOleObj* pDrawObj)
	: COleClientItem(pContainer)
{
	m_pDrawObj = pDrawObj;
}
CDrawItem::~CDrawItem()
{
	if (m_pDrawObj != NULL)
		m_pDrawObj->m_pClientItem = NULL;
}
void CDrawItem::OnChange(OLE_NOTIFICATION nCode, DWORD dwParam)
{
	ASSERT_VALID(this);
	COleClientItem::OnChange(nCode, dwParam);
	switch(nCode)
	{
	case OLE_CHANGED_STATE:
	case OLE_CHANGED_ASPECT:
		m_pDrawObj->Invalidate();
		break;
	case OLE_CHANGED:
		UpdateExtent(); // extent may have changed
		m_pDrawObj->Invalidate();
		break;
	}
}
BOOL CDrawItem::OnChangeItemPosition(const CRect& rectPos)
{
	ASSERT_VALID(this);
	CDrawView* pView = GetActiveView();
	ASSERT_VALID(pView);
	CRect rect = rectPos;
	pView->ClientToDoc(rect);
	if (rect != m_pDrawObj->m_position)
	{
		// invalidate old rectangle
		m_pDrawObj->Invalidate();
		// update to new rectangle
		m_pDrawObj->m_position = rect;
		GetExtent(&m_pDrawObj->m_extent);
		// and invalidate new rectangle
		m_pDrawObj->Invalidate();
		// mark document as dirty
		GetDocument()->SetModifiedFlag();
	}
	return COleClientItem::OnChangeItemPosition(rectPos);
}
void CDrawItem::OnGetItemPosition(CRect& rPosition)
{
	ASSERT_VALID(this);
	// update to extent of item if m_position is not initialized
	if (m_pDrawObj->m_position.IsRectEmpty())
		UpdateExtent();
	// copy m_position, which is in document coordinates
	CDrawView* pView = GetActiveView();
	ASSERT_VALID(pView);
	rPosition = m_pDrawObj->m_position;
	pView->DocToClient(rPosition);
}
void CDrawItem::Serialize(CArchive& ar)
{
	ASSERT_VALID(this);
	// Call base class first to read in COleClientItem data.
	// Note: this sets up the m_pDocument pointer returned from
	//  CDrawItem::GetDocument, therefore it is a good idea
	//  to call the base class Serialize first.
	COleClientItem::Serialize(ar);
	// now store/retrieve data specific to CDrawItem
	if (ar.IsStoring())
	{
		// TODO: add storing code here
	}
	else
	{
		// TODO: add loading code here
	}
}
BOOL CDrawItem::UpdateExtent()
{
	CSize size;
	if (!GetExtent(&size) || size == m_pDrawObj->m_extent)
		return FALSE;       // blank
	// if new object (i.e. m_extent is empty) setup position
	if (m_pDrawObj->m_extent == CSize(0, 0))
	{
		m_pDrawObj->m_position.right =
			m_pDrawObj->m_position.left + MulDiv(size.cx, 10, 254);
		m_pDrawObj->m_position.bottom =
			m_pDrawObj->m_position.top - MulDiv(size.cy, 10, 254);
	}
	// else data changed so scale up rect as well
	else if (!IsInPlaceActive() && size != m_pDrawObj->m_extent)
	{
		m_pDrawObj->m_position.right = m_pDrawObj->m_position.left +
			MulDiv(m_pDrawObj->m_position.Width(), size.cx, m_pDrawObj->m_extent.cx);
		m_pDrawObj->m_position.bottom = m_pDrawObj->m_position.top +
			MulDiv(m_pDrawObj->m_position.Height(), size.cy, m_pDrawObj->m_extent.cy);
	}
	m_pDrawObj->m_extent = size;
	m_pDrawObj->Invalidate();   // redraw to the new size/position
	return TRUE;
}
void CDrawItem::OnActivate()
{
	// allow only one inplace active item per frame
CView * pView = GetActiveView();
	ASSERT_VALID( pView );
CDrawDoc * pDoc = GetDocument();
	ASSERT_VALID( pDoc );
COleClientItem * pItem =
		pDoc->GetInPlaceActiveItem( pView );
	if( pItem != NULL && pItem != this )
		pItem->Close();
	COleClientItem::OnActivate();
CFrameWnd * pFrame = STATIC_DOWNCAST( CFrameWnd, ::AfxGetMainWnd() );
	ASSERT_VALID( pFrame );
	pFrame->SendMessage(
		WM_SETMESSAGESTRING,
		(WPARAM)AFX_IDS_IDLEMESSAGE
		);
	pFrame->DelayRecalcLayout();
}
void CDrawItem::OnDeactivateUI(BOOL bUndoable)
{
//CView * pView = GetActiveView();
CFrameWnd * pFrame = STATIC_DOWNCAST( CFrameWnd, ::AfxGetMainWnd() );
	ASSERT_VALID( pFrame );
	pFrame->SendMessage(
		WM_SETMESSAGESTRING,
		(WPARAM)AFX_IDS_IDLEMESSAGE
		);
	COleClientItem::OnDeactivateUI( bUndoable );
	// hide the object if it is not an outside-in object
DWORD dwMisc = 0;
	m_lpObject->GetMiscStatus(
		GetDrawAspect(),
		&dwMisc
		);
	if( dwMisc & OLEMISC_INSIDEOUT )
		DoVerb( OLEIVERB_HIDE, NULL );
//	if( pView != NULL )
//		pView->PostMessage(WM_COMMAND,ID_CANCEL_EDIT);
	pFrame->DelayRecalcLayout();
	pFrame->SetMenu( NULL );
}
/////////////////////////////////////////////////////////////////////////////
// CDrawItem diagnostics
#ifdef _DEBUG
void CDrawItem::AssertValid() const
{
	COleClientItem::AssertValid();
}
void CDrawItem::Dump(CDumpContext& dc) const
{
	COleClientItem::Dump(dc);
}
#endif
/////////////////////////////////////////////////////////////////////////////

						