XMonoFontDialog - Customizing CFontDialog Part II: Selecting Monospaced Fonts

// XMonoFontListComboEdit.cpp
//
// Author:  Hans Dietrich
//          hdietrich@gmail.com
//
// Description:
//     XMonoFontListComboEdit.cpp implements CXMonoFontListComboEdit, a class 
//     used by CXMonoFontListCombo.
//
// License:
//     This software is released into the public domain.  You are free to use
//     it in any way you like, except that you may not sell this source code.
//
//     This software is provided "as is" with no expressed or implied warranty.
//     I accept no liability for any damage or loss of business that this 
//     software may cause.
//
///////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "XMonoFontListComboEdit.h"

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

#ifndef __noop
#if _MSC_VER < 1300
#define __noop ((void)0)
#endif
#endif

#undef TRACE
#define TRACE __noop

//=============================================================================
// if you want to see the TRACE output, uncomment this line:
//#include "XTrace.h"
//=============================================================================

//=============================================================================
BEGIN_MESSAGE_MAP(CXMonoFontListComboEdit, CEdit)
//=============================================================================
	//{{AFX_MSG_MAP(CXMonoFontListComboEdit)
	ON_CONTROL_REFLECT(EN_SETFOCUS, OnSetfocus)
	ON_WM_CTLCOLOR_REFLECT()
	//}}AFX_MSG_MAP
	ON_WM_PAINT()
END_MESSAGE_MAP()

//=============================================================================
CXMonoFontListComboEdit::CXMonoFontListComboEdit()
//=============================================================================
{
	m_bBold   = FALSE;
	m_strText = _T("");
}

//=============================================================================
CXMonoFontListComboEdit::~CXMonoFontListComboEdit()
//=============================================================================
{
	if (m_Font.GetSafeHandle())
		m_Font.DeleteObject();
	if (m_BoldFont.GetSafeHandle())
		m_BoldFont.DeleteObject();
	if (m_brush.GetSafeHandle())
		m_brush.DeleteObject();
}

//=============================================================================
void CXMonoFontListComboEdit::PreSubclassWindow() 
//=============================================================================
{
	TRACE(_T("in CXMonoFontListComboEdit::PreSubclassWindow ================\n"));

	// get current font
	CFont* pFont = GetSafeFont();

	// create the font for this control
	LOGFONT lf;
	pFont->GetLogFont(&lf);
	m_Font.CreateFontIndirect(&lf);

	lf.lfWeight = FW_BOLD;
	m_BoldFont.CreateFontIndirect(&lf);

	m_brush.CreateSolidBrush(GetSysColor(COLOR_WINDOW));

	CEdit::PreSubclassWindow();
}

//=============================================================================
void CXMonoFontListComboEdit::OnPaint() 
//=============================================================================
{
	CPaintDC dc(this); // device context for painting

	BOOL bFocus = FALSE;
	CWnd *pWndFocus = GetFocus();
	if (pWndFocus && IsWindow(pWndFocus->m_hWnd))
	{
		if (pWndFocus->m_hWnd == m_hWnd)
			bFocus = TRUE;
	}
	
	CString strText = m_strText;
	if (strText.IsEmpty())
		GetWindowText(strText);

	TRACE(_T("strText=%s\n"), strText);

	CRect rc;
	GetClientRect(&rc);
	dc.FillSolidRect(&rc, GetSysColor(COLOR_WINDOW));

	CEdit::SetSel(0, 0);

	CFont *pOldFont = 0;
	if (m_bBold)
		pOldFont = dc.SelectObject(&m_BoldFont);
	else
		pOldFont = dc.SelectObject(&m_Font);

	dc.SetBkMode(OPAQUE);

	if (bFocus)
	{
		dc.SetTextColor(GetSysColor(COLOR_WINDOW));
		dc.SetBkColor(GetSysColor(COLOR_HIGHLIGHT));
	}
	else
	{
		dc.SetTextColor(GetSysColor(COLOR_WINDOWTEXT));
		dc.SetBkColor(GetSysColor(COLOR_WINDOW));
	}

	dc.TextOut(rc.left, rc.top, strText);

	dc.SelectObject(pOldFont);
}

//=============================================================================
CFont * CXMonoFontListComboEdit::GetSafeFont()
//=============================================================================
{
	// get current font
	CFont *pFont = CWnd::GetFont();

	if (pFont == 0)
	{
		// try to get parent font
		CWnd *pParent = GetParent();
		if (pParent && IsWindow(pParent->m_hWnd))
			pFont = pParent->GetFont();

		if (pFont == 0)
		{
			// no font, so get a system font
			HFONT hFont = (HFONT)::GetStockObject(DEFAULT_GUI_FONT);
			if (hFont == 0)
				hFont = (HFONT)::GetStockObject(SYSTEM_FONT);
			if (hFont == 0)
				hFont = (HFONT)::GetStockObject(ANSI_VAR_FONT);
			if (hFont)
				pFont = CFont::FromHandle(hFont);
		}
	}

	return pFont;
}

//=============================================================================
void CXMonoFontListComboEdit::SetWindowText(LPCTSTR lpszString) 
//=============================================================================
{ 
	m_strText = lpszString; 
	RedrawWindow(); 
}

//=============================================================================
LRESULT CXMonoFontListComboEdit::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 
//=============================================================================
{
	if (message == WM_SETTEXT)
	{
		// don't allow CEdit to paint text
		m_strText = (LPCTSTR) lParam;
		lParam = (LPARAM)_T("");
		RedrawWindow();
	}
	else if ((message == WM_LBUTTONDOWN) ||
			 (message == WM_LBUTTONDBLCLK))
	{
		GetParent()->SendMessage(message, wParam, lParam);
		return TRUE;
	}
	else if (message == WM_CHAR)
	{
		// let combobox handle it
		GetParent()->SendMessage(message, wParam, lParam);
		return TRUE;
	}
	else if (message == WM_CONTEXTMENU)
	{
		// suppress context menu
		return TRUE;
	}
	else if (message == WM_ERASEBKGND)
	{
		// entire control is painted in OnPaint
		return TRUE;
	}

	return CEdit::WindowProc(message, wParam, lParam);
}

//=============================================================================
void CXMonoFontListComboEdit::OnSetfocus() 
//=============================================================================
{
	RedrawWindow();	
}

//=============================================================================
HBRUSH CXMonoFontListComboEdit::CtlColor(CDC* /*pDC*/, UINT /*nCtlColor*/) 
//=============================================================================
{
	// this is necessary on Vista
	return m_brush;	
}