Re: CScrollView & scroll bars

On Jan 24, 2:34 am, "ou" <o...@ab.auone-net.jp> wrote:


Here is a somewhat working example. It loads the text from a text
file into the main window. The scrollbars are there when the main
window loads. However, when the scrollbars moves the text is not
updated. The only active scrollbar is the vertical one. If you
stretch the window the text reloads properly. I have not been able to
get the text to update properly when the vertical scrollbar is moved.

// StringTimeView.cpp : implementation of the CStringTimeView class
//

#include "stdafx.h"
#include "StringTime.h"

#include "StringTimeDoc.h"
#include "StringTimeView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CStringTimeView

IMPLEMENT_DYNCREATE(CStringTimeView, CScrollView)

BEGIN_MESSAGE_MAP(CStringTimeView, CScrollView)
    //{{AFX_MSG_MAP(CStringTimeView)
    ON_WM_VSCROLL()
    //}}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()

/////////////////////////////////////////////////////////////////////////////
// CStringTimeView construction/destruction

CStringTimeView::CStringTimeView()
{
    SetScrollSizes(MM_TEXT, CSize(0,0));// Set arbitrary scroll bars
}

CStringTimeView::~CStringTimeView()
{
}

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

    return CScrollView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CStringTimeView drawing

void CStringTimeView::OnDraw(CDC* pDC)
{
    CStringTimeDoc* pDoc = GetDocument();
    ASSERT_VALID(pDoc);
    // int DrawText( const CString& str, LPRECT lpRect,
    // UINT nFormat )
    CRect rect;
    GetClientRect(&rect);
    pDC->DrawText(pDoc->GetString(),&rect,DT_LEFT);
}

/////////////////////////////////////////////////////////////////////////////
// CStringTimeView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CStringTimeView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CStringTimeView message handlers

void CStringTimeView::OnInitialUpdate()
{
    //CSize sizeTotal;
    //sizeTotal.cx=800;
    //sizeTotal.cy=4000;
    // Adding Scroll Bars
    //SetScrollSizes(MM_TEXT, sizeTotal);
    ResetScrollSizes();
    CScrollView::OnInitialUpdate();
}

void CStringTimeView::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar*
pScrollBar)
{
    CScrollView::OnVScroll(nSBCode, nPos, pScrollBar);
}

void CStringTimeView::ResetScrollSizes()
{
    CClientDC aDC(this);
    OnPrepareDC(&aDC);
    CSize DocSize = GetDocument()->GetDocSize();
    aDC.LPtoDP(&DocSize);
    SetScrollSizes(MM_TEXT, DocSize);
    //OnUpdate(NULL,1,NULL);
}

void CStringTimeView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo)
{
    CScrollView::OnPrepareDC(pDC, pInfo);
}