mytextbutton.cpp

一个面向对象的产生式推理模型

// MyTextButton.cpp : implementation file
//

#include "stdafx.h"
//#include "MyText.h"
#include "MyTextButton.h"

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

/////////////////////////////////////////////////////////////////////////////
// CMyTextButton
CMyTextButton::~CMyTextButton()
{
}


BEGIN_MESSAGE_MAP(CMyTextButton, CButton)
	//{{AFX_MSG_MAP(CMyTextButton)
	ON_WM_DRAWITEM()
	ON_WM_ERASEBKGND()
		// NOTE - the ClassWizard will add and remove mapping macros here.
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyTextButton message handlers
void CMyTextButton::PreSubclassWindow()
{
	SetButtonStyle(GetButtonStyle()|BS_OWNERDRAW);
}

void CMyTextButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
	CDC* pDC = CDC::FromHandle(lpDrawItemStruct->hDC);
	ASSERT_VALID(pDC);
	CRect rectClient = lpDrawItemStruct->rcItem;
	Draw(pDC,rectClient,lpDrawItemStruct->itemState);
}

void CMyTextButton::Draw(CDC* pDC,const CRect& rect,UINT state)
{
	CString text;
	GetWindowText(text);
	int l = text.GetLength();
	CRect rectClient=rect;
	// get font from control
	CFont* pFont = GetFont();
	// ensure we have a valid height and width and select the font
	LOGFONT logfont;
	pFont->GetObject(sizeof(LOGFONT),&logfont);
	if (logfont.lfHeight == 0) logfont.lfHeight = 10;
	logfont.lfWidth = 0;
	logfont.lfWeight = 500;
	logfont.lfEscapement = logfont.lfOrientation = 0;
	CFont tryfont;
	VERIFY(tryfont.CreateFontIndirect(&logfont));
	CFont* pFontOld = pDC->SelectObject(&tryfont);
	// get the control size and adjust font width & height accordingly
	if (m_bUse3D) rectClient.DeflateRect(3,3);
	CSize textSizeClient = pDC->GetTextExtent(text,1);
	if (rectClient.Width()*textSizeClient.cy>
		rectClient.Height()*textSizeClient.cx){
		logfont.lfHeight = ::MulDiv(logfont.lfHeight,
			rectClient.Height(),textSizeClient.cy);
	}else {
		logfont.lfHeight = ::MulDiv(logfont.lfHeight,
			rectClient.Width(),textSizeClient.cx);
	}
	logfont.lfHeight--;// fudge factor
	if (m_bUse3D) rectClient.InflateRect(3,3);
	// create adjusted font and select
	CFont font;
	font.CreateFontIndirect(&logfont);
	pDC->SelectObject(&font);
	textSizeClient = pDC->GetTextExtent(text,1);
	int minx = rectClient.left;//+(rectClient.Width()-textSizeClient.cx)/2;
	int miny = rectClient.top;//+(rectClient.Height()-textSizeClient.cy)/2;
	int oldBkMode = pDC->SetBkMode(TRANSPARENT);
	COLORREF textcol = ::GetSysColor((state& ODS_FOCUS)?COLOR_GRAYTEXT:COLOR_BTNTEXT);
	COLORREF oldTextColor = pDC->SetTextColor(textcol);
	int cx = minx;
	int cy = miny;
	if (m_bUse3D){
		int s = (state& ODS_SELECTED)? -1:+1;
		cx += 3; cy += 3;
		// draw 3D highlights
		pDC->SetTextColor(::GetSysColor(COLOR_3DDKSHADOW));
		pDC->TextOut(cx-s*2,cy+s*2,text);
		pDC->TextOut(cx+s*2,cy-s*2,text);
		pDC->TextOut(cx+s*2,cy+s*2,text);

		pDC->SetTextColor(::GetSysColor(COLOR_3DHILIGHT));
		pDC->TextOut(cx+s*1,cy-s*2,text);
		pDC->TextOut(cx-s*2,cy+s*1,text);
		pDC->TextOut(cx-s*2,cy-s*2,text);

		pDC->SetTextColor(::GetSysColor(COLOR_3DSHADOW));
		pDC->TextOut(cx-s*1,cy+s*1,text);
		pDC->TextOut(cx+s*1,cy-s*1,text);
		pDC->TextOut(cx+s*1,cy+s*1,text);

		pDC->SetTextColor(::GetSysColor(COLOR_3DLIGHT));
		pDC->TextOut(cx,cy-s*1,text);
		pDC->TextOut(cx-s*1,cy,text);
		pDC->TextOut(cx-s*1,cy-s*1,text);
		pDC->SetTextColor(textcol);
	}
	//draw the text
	pDC->TextOut(cx,cy,text);
	//restore DC
	pDC->SetTextColor(oldTextColor);
	pDC->SetBkMode(oldBkMode);
	pDC->SelectObject(pFontOld);
}

BOOL CMyTextButton::OnEraseBkgnd(CDC*)
{
	return true;// we don't do any erasing...
}