如何在对话框中实现3D文本效果

本程序讲述如何在对话框中实现3D文本效果，参见下图。

///////////////////////////////////////////////////////////////////////////

//

// MyTextButton.h interface for CMyTextButton

// (c) Roger Onslow, 1997

// use freely and enjoy

///////////////////////////////////////////////////////////////////////////

//

#ifndef _CMyTextButton_

#define _CMyTextButton_

///////////////////////////////////////////////////////////////////////////

//

// CMyTextButton control

class CMyTextButton : public CButton {

bool m_bUse3D;

public:

CMyTextButton() : m_bUse3D(true) {}

void Use3D(bool bUse3D=true) { m_bUse3D = bUse3D; }

protected:

void Draw(CDC* pDC, const CRect& rect, UINT state);

//{{AFX_MSG(CMyTextButton)

afx_msg void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);

afx_msg BOOL OnEraseBkgnd(CDC* pDC);

//}}AFX_MSG

//{{AFX_VIRTUAL(CMyTextButton)

virtual void PreSubclassWindow();

//}}AFX_VIRTUAL

DECLARE_MESSAGE_MAP()

};

///////////////////////////////////////////////////////////////////////////

//

#endif

///////////////////////////////////////////////////////////////////////////

//

// MyTextButton.cpp - large text which acts as a button

// (c) Roger Onslow, 1997

// use freely and enjoy

///////////////////////////////////////////////////////////////////////////

//

#include "stdafx.h"

#include "MyTextButton.h"

#ifdef _DEBUG

#undef THIS_FILE

static char BASED_CODE THIS_FILE[] = __FILE__;

#endif

///////////////////////////////////////////////////////////////////////////

//

// CMyTextButton

BEGIN_MESSAGE_MAP(CMyTextButton, CButton)

//{{AFX_MSG_MAP(CMyTextButton)

ON_WM_DRAWITEM()

ON_WM_ERASEBKGND()

//}}AFX_MSG_MAP

END_MESSAGE_MAP()

void CMyTextButton::PreSubclassWindow() {

SetButtonStyle(GetButtonStyle() | BS_OWNERDRAW);

}

///////////////////////////////////////////////////////////////////////////

//

// CMyTextButton message handlers

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 = 20;

logfont.lfWidth = 0; // 0 so it will be calculated

logfont.lfWeight = 1000;

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,l);

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,l);

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...

}

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