gdiview.cpp

来自「MFC编程实例」· C++ 代码 · 共 210 行

#include "stdafx.h"
#include "GDI.h"
#include "GDIDoc.h"
#include "GDIView.h"

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

IMPLEMENT_DYNCREATE(CGDIView, CScrollView)

BEGIN_MESSAGE_MAP(CGDIView, CScrollView)
	//{{AFX_MSG_MAP(CGDIView)
	ON_WM_DESTROY()
	ON_WM_KEYDOWN()
	ON_WM_CHAR()
	ON_WM_SETCURSOR()
	ON_WM_LBUTTONDOWN()
	//}}AFX_MSG_MAP
	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()

CGDIView::CGDIView()
{
}

CGDIView::~CGDIView()
{
}

BOOL CGDIView::PreCreateWindow(CREATESTRUCT& cs)
{
	return CScrollView::PreCreateWindow(cs);
}

void CGDIView::OnDraw(CDC *pDC)
{
	CString szText;
	CFont *ptrFontOld;

	CGDIDoc *pDoc=GetDocument();
	ASSERT_VALID(pDoc);
	szText=pDoc->GetText();
	ptrFontOld=pDC->SelectObject(pDoc->GetFont());
	pDC->TextOut(0, 0, szText);
	pDC->SelectObject(ptrFontOld);
}

void CGDIView::OnInitialUpdate()
{
	CScrollView::OnInitialUpdate();
	CSize sizeTotal;
	sizeTotal.cx=sizeTotal.cy=100;
	SetScrollSizes(MM_TEXT, sizeTotal);
	CreateNewCaret(FALSE);
	m_hCur=AfxGetApp()->LoadStandardCursor(IDC_IBEAM);
}

BOOL CGDIView::OnPreparePrinting(CPrintInfo* pInfo)
{
	return DoPreparePrinting(pInfo);
}

void CGDIView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
}

void CGDIView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
}

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

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

CGDIDoc* CGDIView::GetDocument()
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CGDIDoc)));
	return (CGDIDoc*)m_pDocument;
}
#endif

void CGDIView::OnDestroy() 
{
	HideCaret();
	::DestroyCaret();
	CScrollView::OnDestroy();
}

void CGDIView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	CGDIDoc *ptrDoc;
	SHORT nKeyState;

	ptrDoc=(CGDIDoc *)GetDocument();
	ASSERT(ptrDoc);
	switch(nChar)
	{
		case VK_LEFT:
		{
			nKeyState=GetKeyState(VK_CONTROL);
			if(HIBYTE(nKeyState) != 0)
			{
				ptrDoc->BackwardCaretToBlank();
			}
			else ptrDoc->BackwardCaret();
			break;
		}
		case VK_RIGHT:
		{
			nKeyState=GetKeyState(VK_CONTROL);
			if(HIBYTE(nKeyState) != 0)
			{
				ptrDoc->ForwardCaretToBlank();
			}
			else ptrDoc->ForwardCaret();
			break;
		}
		case VK_END:
		{
			ptrDoc->EndCaret();
			break;
		}
		case VK_HOME:
		{
			ptrDoc->HomeCaret();
			break;
		}
		case VK_DELETE:
		{
			ptrDoc->DeleteChar(FALSE);
			break;
		}
	}
	CScrollView::OnKeyDown(nChar, nRepCnt, nFlags);
}

void CGDIView::RedrawCaret()
{
	CGDIDoc *ptrDoc;

	ptrDoc=(CGDIDoc *)GetDocument();
	HideCaret();
	SetCaretPos(ptrDoc->GetCaretPosition());
	ShowCaret();
}

void CGDIView::CreateNewCaret(BOOL bDestroy)
{
	CGDIDoc *ptrDoc;

	if(bDestroy == TRUE)::DestroyCaret();
	ptrDoc=(CGDIDoc *)GetDocument();
	CreateSolidCaret(0, ptrDoc->GetCaretVerSize());
	SetCaretPos(ptrDoc->GetCaretPosition());
	ShowCaret();
}

void CGDIView::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	CGDIDoc *ptrDoc;
	
	ptrDoc=(CGDIDoc *)GetDocument();
	if(nChar != VK_RETURN && nChar != VK_ESCAPE && nChar != VK_TAB)
	{
		if(nChar == VK_BACK)ptrDoc->DeleteChar(TRUE);
		else ptrDoc->AddChar(nChar, nRepCnt);
	}
	CScrollView::OnChar(nChar, nRepCnt, nFlags);
}

BOOL CGDIView::OnSetCursor(CWnd *pWnd, UINT nHitTest, UINT message) 
{
	POINT pt;
	CRect rect(0, 0, 0, 0);
	CGDIDoc *ptrDoc;
	
	::GetCursorPos(&pt);
	ScreenToClient(&pt);
	ptrDoc=(CGDIDoc *)GetDocument();
	rect.right=ptrDoc->GetTextHorSize();
	rect.bottom=ptrDoc->GetCaretVerSize();
	if(rect.PtInRect(pt) == TRUE)
	{
		::SetCursor(m_hCur);
		return TRUE;
	}
	return CScrollView::OnSetCursor(pWnd, nHitTest, message);
}

void CGDIView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	CGDIDoc *ptrDoc;
	
	ptrDoc=(CGDIDoc *)GetDocument();
	if(::GetCursor() == m_hCur)ptrDoc->SetCaret(point);
	CScrollView::OnLButtonDown(nFlags, point);
}