ccachedscrollviewpview.cpp

《Visual C／C++图形图像与游戏编程典型实例解析》配套源代码

// CCachedScrollViewPView.cpp : implementation of the CCCachedScrollViewPView class
//

#include "stdafx.h"
#include "CCachedScrollViewP.h"
#include "mainfrm.h"
#include "CCachedScrollViewPDoc.h"
#include "CCachedScrollViewPView.h"
#include "CachedScrollView.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CCCachedScrollViewPView

IMPLEMENT_DYNCREATE(CCCachedScrollViewPView, CCachedScrollView)

BEGIN_MESSAGE_MAP(CCCachedScrollViewPView, CCachedScrollView)
	//{{AFX_MSG_MAP(CCCachedScrollViewPView)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CScrollView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CScrollView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CScrollView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCCachedScrollViewPView construction/destruction

CCCachedScrollViewPView::CCCachedScrollViewPView()
{
	// TODO: add construction code here

}

CCCachedScrollViewPView::~CCCachedScrollViewPView()
{
}

BOOL CCCachedScrollViewPView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CScrollView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CCCachedScrollViewPView drawing

void CCCachedScrollViewPView::OnDraw(CDC* pDC)
{
	CCCachedScrollViewPDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);    
	pDC->BitBlt(0,0,m_nBmpWidth,m_nBmpHeight,
        &m_MemDC,0,0,SRCCOPY);
	
    SetScrollSizes(MM_TEXT, CSize(m_nBmpWidth,m_nBmpHeight));
    CMainFrame *pParentFrame=(CMainFrame *)this->GetParentFrame();
    pParentFrame->RecalcLayout();
    ResizeParentToFit();  
}	

void CCCachedScrollViewPView::OnInitialUpdate()
{
	//CScrollView::OnInitialUpdate();

	CSize sizeTotal;
	// TODO: calculate the total size of this view
	CDC *pDC = this->GetDC();
    m_MemDC.CreateCompatibleDC(pDC);
    m_bmpView.LoadBitmap(IDB_BITMAP1);    
    // 这里IDB_BITMAP1是已经加入到工程资源中的BMP文件，当然也可以用文件的方式将图片从硬盘载入到内存中然后进行显示。
    m_MemDC.SelectObject(&m_bmpView);
    BITMAP Bitmap;
    m_bmpView.GetBitmap(&Bitmap);
    m_nBmpHeight = Bitmap.bmHeight;
    m_nBmpWidth = Bitmap.bmWidth;
    CSize size(m_nBmpWidth,m_nBmpHeight);
    SetScrollSizes(MM_TEXT,size);
	SetCacheSize(size);	
	this->ReleaseDC(pDC); 
	
}

/////////////////////////////////////////////////////////////////////////////
// CCCachedScrollViewPView printing

BOOL CCCachedScrollViewPView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CCCachedScrollViewPView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CCCachedScrollViewPView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CCCachedScrollViewPView diagnostics

#ifdef _DEBUG
void CCCachedScrollViewPView::AssertValid() const
{
	CScrollView::AssertValid();
}

void CCCachedScrollViewPView::Dump(CDumpContext& dc) const
{
	CScrollView::Dump(dc);
}

CCCachedScrollViewPDoc* CCCachedScrollViewPView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CCCachedScrollViewPDoc)));
	return (CCCachedScrollViewPDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CCCachedScrollViewPView message handlers