htextvw.cpp

VisualC++多媒体开发指南配套源码

// htextvw.cpp : implementation of the CHtext2View class
//

#include "stdafx.h"
#include "htext2.h"

#include "htextdoc.h"
#include "htextvw.h"

#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CHtext2View

IMPLEMENT_DYNCREATE(CHtext2View, CScrollView)

BEGIN_MESSAGE_MAP(CHtext2View, CScrollView)
	//{{AFX_MSG_MAP(CHtext2View)
	ON_WM_LBUTTONDOWN()
	ON_WM_PAINT()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CHtext2View construction/destruction

CHtext2View::CHtext2View()
{
	// TODO: add construction code here

}

CHtext2View::~CHtext2View()
{
}

/////////////////////////////////////////////////////////////////////////////
// CHtext2View drawing

void CHtext2View::OnDraw(CDC* pDC)
{
	CHtext2Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);

	//Change display font.
	CFont theFont;
	int fontHeight = 24;
	theFont.CreateFont(fontHeight, 0, 
						0,0,400,
						FALSE,FALSE,0,
						ANSI_CHARSET,
						OUT_DEFAULT_PRECIS,
						CLIP_DEFAULT_PRECIS,
						DEFAULT_QUALITY,
						DEFAULT_PITCH | FF_SWISS,
						"Ariel");
	pDC->SelectObject(&theFont);
	DisplayTopic(pDC, pDoc);
}

void CHtext2View::OnInitialUpdate()
{
	CScrollView::OnInitialUpdate();

	// Set the scroll view's extent and the page and line scroll sizes..
	CSize sizeTotal, sizePage, sizeLine;
	CRect Rect;
	CWnd::GetClientRect(&Rect);
	sizeTotal.cx = Rect.right - 20;
	sizeTotal.cy = Rect.bottom * 4;
	sizePage.cx = sizeTotal.cx;
	sizePage.cy = sizeTotal.cy /5;
	sizeLine.cx = sizeLine.cy = 20;
	SetScrollSizes(MM_TEXT, sizeTotal);
}

void CHtext2View::DisplayTopic(CDC* pDC, CHtext2Doc* pDoc)
{
	CString Temp, NextWord;
	const char EndWord[] = " .;:!?\n"; //Characters that mark end of word.
	int stop, lineHeight, windowWidth, WordALink = FALSE;
	const int margin = 10;
	CSize wordWidth;
	TEXTMETRIC TM;
	CRect Rect;
	CPoint here;
	COLORREF oldColor;
		
	//Initialize the link array.
	pDoc->InitLinkArray();
	
	//Get the height of a line of text.
	pDC->GetTextMetrics(&TM);
	lineHeight = TM.tmHeight + TM.tmExternalLeading;
	
	//Get the width of the window.
	CWnd::GetClientRect(&Rect);
	windowWidth = Rect.right;

	//Move current position to provide top and left margins.
	here.x = here.y = margin;

	//Get the topic text to display.
	Temp = pDoc->GetTopic();

	//Find the end of the first word and extract the word.
	stop = Temp.FindOneOf(EndWord) + 1;
	NextWord = Temp.Left(stop);
	
	//Loop through the topic text until all words are displayed.
	for ( ; NextWord != "" ; )
		{
		//Is there a new line at the end of the word? If so, strip it
		//off and move to the start of the next line.
		if (NextWord.Find('\n') != -1)
			{
			//MessageBox("Found");
			NextWord = NextWord.Left(NextWord.GetLength()-1);
			here.y += lineHeight;
			here.x = margin;
			}
		
		//If the word is link, strip off the ## marker and
		//set the link flag.
		if (NextWord.Left(2) == "##")
			{
			NextWord = NextWord.Right(NextWord.GetLength() - 2);
			WordALink = TRUE;
			}
		
		//Get the word's display width.
		wordWidth = pDC->GetTextExtent(NextWord, NextWord.GetLength());
		
		//Will it extend past the right margin? If so, start new line.
		if ((wordWidth.cx + here.x) > windowWidth )
			{
			here.x = margin;
			here.y += lineHeight;
			}
	
		//If the word is a link, display it in red and and update the
		//link array.
		if (WordALink)
			{
			oldColor = pDC->SetTextColor(RGB(200,0,0));
			pDC->TextOut(here.x,here.y,NextWord);
			pDC->SetTextColor(oldColor);
			CRect LinkIs;
			LinkIs.left = here.x;
			LinkIs.top = here.y;
			LinkIs.right = here.x + wordWidth.cx;
			LinkIs.bottom = here.y + wordWidth.cy;
			pDoc->CreateLink(NextWord, LinkIs);
			WordALink = FALSE;
			}
		else //If the word is not a link, display it in black.
			{
			pDC->TextOut(here.x,here.y,NextWord);
			}
		here.x += wordWidth.cx;
		Temp = Temp.Right(Temp.GetLength() - stop);
		stop = Temp.FindOneOf(EndWord) + 1;
		NextWord = Temp.Left(stop);
		}
}

/////////////////////////////////////////////////////////////////////////////
// CHtext2View diagnostics

#ifdef _DEBUG
void CHtext2View::AssertValid() const
{
	CScrollView::AssertValid();
}

void CHtext2View::Dump(CDumpContext& dc) const
{
	CScrollView::Dump(dc);
}

CHtext2Doc* CHtext2View::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CHtext2Doc)));
	return (CHtext2Doc*)m_pDocument;
}		
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CHtext2View message handlers

void CHtext2View::OnLButtonDown(UINT nFlags, CPoint point) 
{
//Called when the user presses the left mouse button.

	CHtext2Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);

	CString text;
	
	//Offset mouse position by the scroll position.
	point.Offset(GetScrollPosition());

	//Call CHtext2Doc's IsLink() member function to see if user
	//clicked in a hotlink.
	text = pDoc->IsLink(point);

	//If so, display the link text.
	if (text != "")
		{
		text = "You clicked on the hyperlink '" + text + "'.";
		MessageBox(text);
		}

	//Call the default message handler.
	CScrollView::OnLButtonDown(nFlags, point);
}