QBasic & Borland Pascal & C/Delphi5.iso/C/BC_502/SCRIB2.PAK/SCRIBDOC.CPP

C/C++ Source or Header | 1997-05-06 | 4.9 KB | 212 lines

// ScribDoc.cpp : implementation of the CScribbleDoc class
//
// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1995 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 "Scribble.h"

#include "ScribDoc.h"

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

/////////////////////////////////////////////////////////////////////////////
// CScribbleDoc

IMPLEMENT_DYNCREATE(CScribbleDoc, CDocument)

BEGIN_MESSAGE_MAP(CScribbleDoc, CDocument)
    //{{AFX_MSG_MAP(CScribbleDoc)
    ON_COMMAND(ID_EDIT_CLEAR_ALL, OnEditClearAll)
    ON_COMMAND(ID_PEN_THICK_OR_THIN, OnPenThickOrThin)
    ON_UPDATE_COMMAND_UI(ID_EDIT_CLEAR_ALL, OnUpdateEditClearAll)
    ON_UPDATE_COMMAND_UI(ID_PEN_THICK_OR_THIN, OnUpdatePenThickOrThin)
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CScribbleDoc construction/destruction

CScribbleDoc::CScribbleDoc()
{
    // TODO: add one-time construction code here

}

CScribbleDoc::~CScribbleDoc()
{
}

BOOL CScribbleDoc::OnNewDocument()
{
    if (!CDocument::OnNewDocument())
        return FALSE;
    InitDocument();
    return TRUE;
}

/////////////////////////////////////////////////////////////////////////////
// CScribbleDoc serialization

void CScribbleDoc::Serialize(CArchive& ar)
{
    if (ar.IsStoring())
    {
    }
    else
    {
    }
    m_strokeList.Serialize(ar);
}

/////////////////////////////////////////////////////////////////////////////
// CScribbleDoc diagnostics

#ifdef _DEBUG
void CScribbleDoc::AssertValid() const
{
    CDocument::AssertValid();
}

void CScribbleDoc::Dump(CDumpContext& dc) const
{
    CDocument::Dump(dc);
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CScribbleDoc commands

BOOL CScribbleDoc::OnOpenDocument(LPCTSTR lpszPathName)
{
    if (!CDocument::OnOpenDocument(lpszPathName))
        return FALSE;
    InitDocument();
    return TRUE;
}

void CScribbleDoc::DeleteContents()
{
    while (!m_strokeList.IsEmpty())
    {
        delete m_strokeList.RemoveHead();
    }
    CDocument::DeleteContents();
}

void CScribbleDoc::InitDocument()
{
    m_bThickPen = FALSE;
    m_nThinWidth = 2;   // default thin pen is 2 pixels wide
    m_nThickWidth = 5;  // default thick pen is 5 pixels wide
    ReplacePen();       // initialize pen according to current width
}

CStroke* CScribbleDoc::NewStroke()
{
    CStroke* pStrokeItem = new CStroke(m_nPenWidth);
    m_strokeList.AddTail(pStrokeItem);
    SetModifiedFlag();  // Mark the document as having been modified, for
                        // purposes of confirming File Close.
    return pStrokeItem;
}




/////////////////////////////////////////////////////////////////////////////
// CStroke

IMPLEMENT_SERIAL(CStroke, CObject, 1)
CStroke::CStroke()
{
    // This empty constructor should be used by serialization only
}

CStroke::CStroke(UINT nPenWidth)
{
    m_nPenWidth = nPenWidth;
}

void CStroke::Serialize(CArchive& ar)
{
    if (ar.IsStoring())
    {
        ar << (WORD)m_nPenWidth;
        m_pointArray.Serialize(ar);
    }
    else
    {
        WORD w;
        ar >> w;
        m_nPenWidth = w;
        m_pointArray.Serialize(ar);
    }
}

BOOL CStroke::DrawStroke(CDC* pDC)
{
    CPen penStroke;
    if (!penStroke.CreatePen(PS_SOLID, m_nPenWidth, RGB(0,0,0)))
        return FALSE;
    CPen* pOldPen = pDC->SelectObject(&penStroke);
    pDC->MoveTo(m_pointArray[0]);
    for (int i=1; i < m_pointArray.GetSize(); i++)
    {
        pDC->LineTo(m_pointArray[i]);
    }

    pDC->SelectObject(pOldPen);
    return TRUE;
}
void CScribbleDoc::OnEditClearAll()
{
    DeleteContents();
    SetModifiedFlag();  // Mark the document as having been modified, for
                        // purposes of confirming File Close.
    UpdateAllViews(NULL);
}

void CScribbleDoc::OnPenThickOrThin()
{
    // Toggle the state of the pen between thin or thick.
    m_bThickPen = !m_bThickPen;

    // Change the current pen to reflect the new user-specified width.
    ReplacePen();
}

void CScribbleDoc::ReplacePen()
{
    m_nPenWidth = m_bThickPen? m_nThickWidth : m_nThinWidth;

    // Change the current pen to reflect the new user-specified width.
    m_penCur.DeleteObject();
    m_penCur.CreatePen(PS_SOLID, m_nPenWidth, RGB(0,0,0)); // solid black
}

void CScribbleDoc::OnUpdateEditClearAll(CCmdUI* pCmdUI)
{
    // Enable the command user interface object (menu item or tool bar
    // button) if the document is non-empty, i.e., has at least one stroke.
    pCmdUI->Enable(!m_strokeList.IsEmpty());
}

void CScribbleDoc::OnUpdatePenThickOrThin(CCmdUI* pCmdUI)
{
    // Add check mark to Draw Thick Line menu item, if the current
    // pen width is "thick".
    pCmdUI->SetCheck(m_bThickPen);
}