scribvw.cpp

MFC深入浅出第二版（简体）pdf电子版

// 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();
}