ex_textview.cpp

Visual C++应用教程-源代码 本书在复习C++基础知识后

// Ex_TextView.cpp : implementation of the CEx_TextView class
//

#include "stdafx.h"
#include "Ex_Text.h"

#include "Ex_TextDoc.h"
#include "Ex_TextView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CEx_TextView

IMPLEMENT_DYNCREATE(CEx_TextView, CScrollView)

BEGIN_MESSAGE_MAP(CEx_TextView, CScrollView)
	//{{AFX_MSG_MAP(CEx_TextView)
	ON_WM_LBUTTONDBLCLK()
	//}}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()

/////////////////////////////////////////////////////////////////////////////
// CEx_TextView construction/destruction

CEx_TextView::CEx_TextView()
{
	// TODO: add construction code here

	memset(&m_lfText, 0, sizeof(LOGFONT));
	m_lfText.lfHeight = -12;	
	m_lfText.lfCharSet = GB2312_CHARSET;
	strcpy(m_lfText.lfFaceName, "宋体");	
}

CEx_TextView::~CEx_TextView()
{
}

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

	return CScrollView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CEx_TextView drawing

void CEx_TextView::OnDraw(CDC* pDC)
{
	CEx_TextDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	// 创建字体
	CFont cf;
	cf.CreateFontIndirect(&m_lfText);
	CFont* oldFont = pDC->SelectObject(&cf);

	// 计算每行高度
	TEXTMETRIC tm;
	pDC->GetTextMetrics(&tm);
	int lineHeight = tm.tmHeight + tm.tmExternalLeading;
	int y = 0;

	int tab = tm.tmAveCharWidth * 4;		// 为一个TAB设置4个字符

	// 输出并计算行的最大长度
	int lineMaxWidth = 0;
	CString str;
	CSize lineSize(0,0);
	for (int i=0; i<pDoc->m_strContents.GetSize(); i++) 
	{
		str = pDoc->m_strContents.GetAt(i);
		pDC->TabbedTextOut(0, y, str, 1, &tab, 0);
		str = str + "A";	// 多计算一个字符宽度
		lineSize = pDC->GetTabbedTextExtent(str, 1, &tab);
		if ( lineMaxWidth < lineSize.cx )
			lineMaxWidth = lineSize.cx;
		y += lineHeight;
	}
	pDC->SelectObject(oldFont);

	int nLines =  pDoc->m_strContents.GetSize() + 1;	// 多算一行
	CSize sizeTotal;
	sizeTotal.cx = lineMaxWidth;
	sizeTotal.cy = lineHeight * nLines;
	SetScrollSizes(MM_TEXT, sizeTotal);			// 设置滚动逻辑窗口的大小
}

void CEx_TextView::OnInitialUpdate()
{
	CScrollView::OnInitialUpdate();

	CSize sizeTotal;
	// TODO: calculate the total size of this view
	sizeTotal.cx = sizeTotal.cy = 100;
	SetScrollSizes(MM_TEXT, sizeTotal);
}

/////////////////////////////////////////////////////////////////////////////
// CEx_TextView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CEx_TextView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CEx_TextView message handlers

void CEx_TextView::OnLButtonDblClk(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	
	CFontDialog dlg(&m_lfText);
	if (dlg.DoModal() == IDOK){
		dlg.GetCurrentFont(&m_lfText);
		Invalidate();
	}
	CScrollView::OnLButtonDblClk(nFlags, point);
}