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SCRIB4.PAK
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SCRIBVW.CPP
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C/C++ Source or Header
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1997-05-06
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8KB
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261 lines
// ScribVw.cpp : implementation of the CScribbleView 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"
#include "ScribVw.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CScribbleView
IMPLEMENT_DYNCREATE(CScribbleView, CScrollView)
BEGIN_MESSAGE_MAP(CScribbleView, CScrollView)
//{{AFX_MSG_MAP(CScribbleView)
ON_WM_LBUTTONDOWN()
ON_WM_LBUTTONUP()
ON_WM_MOUSEMOVE()
//}}AFX_MSG_MAP
// Standard printing commands
ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CScribbleView construction/destruction
CScribbleView::CScribbleView()
{
// TODO: add construction code here
}
CScribbleView::~CScribbleView()
{
}
BOOL CScribbleView::PreCreateWindow(CREATESTRUCT& cs)
{
// TODO: Modify the Window class or styles here by modifying
// the CREATESTRUCT cs
return CView::PreCreateWindow(cs);
}
/////////////////////////////////////////////////////////////////////////////
// CScribbleView drawing
void CScribbleView::OnDraw(CDC* pDC)
{
CScribbleDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
// Get the invalidated rectangle of the view, or in the case
// of printing, the clipping region of the printer dc.
CRect rectClip;
CRect rectStroke;
pDC->GetClipBox(&rectClip);
// Note: CScrollView::OnPaint() will have already adjusted the
// viewport origin before calling OnDraw(), to reflect the
// currently scrolled position.
// The view delegates the drawing of individual strokes to
// CStroke::DrawStroke().
CTypedPtrList<CObList,CStroke*>& strokeList = pDoc->m_strokeList;
POSITION pos = strokeList.GetHeadPosition();
while (pos != NULL)
{
CStroke* pStroke = strokeList.GetNext(pos);
rectStroke = pStroke->GetBoundingRect();
if (!rectStroke.IntersectRect(&rectStroke, &rectClip))
continue;
pStroke->DrawStroke(pDC);
}
}
/////////////////////////////////////////////////////////////////////////////
// CScribbleView printing
BOOL CScribbleView::OnPreparePrinting(CPrintInfo* pInfo)
{
// default preparation
return DoPreparePrinting(pInfo);
}
void CScribbleView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
// TODO: add extra initialization before printing
}
void CScribbleView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
// TODO: add cleanup after printing
}
/////////////////////////////////////////////////////////////////////////////
// CScribbleView diagnostics
#ifdef _DEBUG
void CScribbleView::AssertValid() const
{
CScrollView::AssertValid();
}
void CScribbleView::Dump(CDumpContext& dc) const
{
CScrollView::Dump(dc);
}
CScribbleDoc* CScribbleView::GetDocument() // non-debug version is inline
{
ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CScribbleDoc)));
return (CScribbleDoc*)m_pDocument;
}
#endif //_DEBUG
/////////////////////////////////////////////////////////////////////////////
// CScribbleView message handlers
void CScribbleView::OnLButtonDown(UINT, CPoint point)
{
// Pressing the mouse button in the view window starts a new stroke
// CScrollView changes the viewport origin and mapping mode.
// It's necessary to convert the point from device coordinates
// to logical coordinates, such as are stored in the document.
CClientDC dc(this);
OnPrepareDC(&dc);
dc.DPtoLP(&point);
m_pStrokeCur = GetDocument()->NewStroke();
// Add first point to the new stroke
m_pStrokeCur->m_pointArray.Add(point);
SetCapture(); // Capture the mouse until button up.
m_ptPrev = point; // Serves as the MoveTo() anchor point for the
// LineTo() the next point, as the user drags the
// mouse.
return;
}
void CScribbleView::OnLButtonUp(UINT, CPoint point)
{
// Mouse button up is interesting in the Scribble application
// only if the user is currently drawing a new stroke by dragging
// the captured mouse.
if (GetCapture() != this)
return; // If this window (view) didn't capture the mouse,
// then the user isn't drawing in this window.
CScribbleDoc* pDoc = GetDocument();
CClientDC dc(this);
// CScrollView changes the viewport origin and mapping mode.
// It's necessary to convert the point from device coordinates
// to logical coordinates, such as are stored in the document.
OnPrepareDC(&dc); // set up mapping mode and viewport origin
dc.DPtoLP(&point);
CPen* pOldPen = dc.SelectObject(pDoc->GetCurrentPen());
dc.MoveTo(m_ptPrev);
dc.LineTo(point);
dc.SelectObject(pOldPen);
m_pStrokeCur->m_pointArray.Add(point);
// Tell the stroke item that we're done adding points to it.
// This is so it can finish computing its bounding rectangle.
m_pStrokeCur->FinishStroke();
// Tell the other views that this stroke has been added
// so that they can invalidate this stroke's area in their
// client area.
pDoc->UpdateAllViews(this, 0L, m_pStrokeCur);
ReleaseCapture(); // Release the mouse capture established at
// the beginning of the mouse drag.
return;
}
void CScribbleView::OnMouseMove(UINT, CPoint point)
{
// Mouse movement is interesting in the Scribble application
// only if the user is currently drawing a new stroke by dragging
// the captured mouse.
if (GetCapture() != this)
return; // If this window (view) didn't capture the mouse,
// then the user isn't drawing in this window.
CClientDC dc(this);
// CScrollView changes the viewport origin and mapping mode.
// It's necessary to convert the point from device coordinates
// to logical coordinates, such as are stored in the document.
OnPrepareDC(&dc);
dc.DPtoLP(&point);
m_pStrokeCur->m_pointArray.Add(point);
// Draw a line from the previous detected point in the mouse
// drag to the current point.
CPen* pOldPen = dc.SelectObject(GetDocument()->GetCurrentPen());
dc.MoveTo(m_ptPrev);
dc.LineTo(point);
dc.SelectObject(pOldPen);
m_ptPrev = point;
return;
}
void CScribbleView::OnUpdate(CView* /* pSender */, LPARAM /* lHint */,
CObject* pHint)
{
// The document has informed this view that some data has changed.
if (pHint != NULL)
{
if (pHint->IsKindOf(RUNTIME_CLASS(CStroke)))
{
// The hint is that a stroke as been added (or changed).
// So, invalidate its rectangle.
CStroke* pStroke = (CStroke*)pHint;
CClientDC dc(this);
OnPrepareDC(&dc);
CRect rectInvalid = pStroke->GetBoundingRect();
dc.LPtoDP(&rectInvalid);
InvalidateRect(&rectInvalid);
return;
}
}
// We can't interpret the hint, so assume that anything might
// have been updated.
Invalidate(TRUE);
return;
}
void CScribbleView::OnInitialUpdate()
{
SetScrollSizes(MM_TEXT, GetDocument()->GetDocSize());
CScrollView::OnInitialUpdate();
}