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   <TITLE>Controls - Combobox Color Picker</TITLE>
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<FONT COLOR="#AOAO99">Combobox Color Picker</FONT></H3></CENTER>
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This article was contributed by <A HREF="mailto:baldvin@trafficsoftware.com">Baldvin Hansson</A>.


<p>I recently wanted to allow certain color selection in one of my projects. The common control available
is a great thing but I wanted the look-and-feel of something similar to what VC++ offers in it's options
dialog box. The following code acomplishes exactly that.
</p>

<P>Just include the ComboColorPicker.h and ComboColorPicker.cpp files in your project and create a control 
member variable for a regular combobox in VC's classwizard and you have your self a combobox for color selection.
This combobox implements focus indication correctly but still lacks the [Automatic] option VC has.
</p>

<p><img src="ComboColorPicker.gif" tppabs="http://www.codeguru.com/controls/ComboColorPicker.gif"></p>

<p>
<b>ComboColorPicker.h</b>
<PRE><TT><FONT COLOR="#990000">
#if !defined(AFX_COMBOCOLORPICKER_H__B2348841_5541_11D1_8756_00A0C9181E86__INCLUDED_)
#define AFX_COMBOCOLORPICKER_H__B2348841_5541_11D1_8756_00A0C9181E86__INCLUDED_

#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000
// ComboColorPicker.h : header file
// &copy; 1997 Baldvin Hansson

/////////////////////////////////////////////////////////////////////////////
// CComboColorPicker window

class CComboColorPicker : public CComboBox
{
// Construction
public:
	CComboColorPicker();

// Attributes
private:
	bool m_bInitialized;
	static COLORREF m_rgStandardColors[];
public:

// Operations
private:
	void InitializeData();
public:
	COLORREF GetSelectedColor();

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CComboColorPicker)
	protected:
	virtual void PreSubclassWindow();
	//}}AFX_VIRTUAL
	virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);

// Implementation
public:
	virtual ~CComboColorPicker();

	// Generated message map functions
protected:
	//{{AFX_MSG(CComboColorPicker)
	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
	//}}AFX_MSG

	DECLARE_MESSAGE_MAP()
};

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

//{{AFX_INSERT_LOCATION}}
// Microsoft Developer Studio will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_COMBOCOLORPICKER_H__B2348841_5541_11D1_8756_00A0C9181E86__INCLUDED_)
</FONT></TT></PRE>
</p>

<p>
<b>ComboColorPicker.cpp</b>
<PRE><TT><FONT COLOR="#990000">
// ComboColorPicker.cpp : implementation file
// &copy; 1997 Baldvin Hansson

#include "stdafx.h"
#include "ComboColorPicker.h"

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

/////////////////////////////////////////////////////////////////////////////
// CComboColorPicker

COLORREF CComboColorPicker::m_rgStandardColors[] = {
	RGB(0, 0, 0),			// Black
	RGB(255, 255, 255),		// White
	RGB(128, 0, 0),			// Dark Red
	RGB(0, 128, 0),			// Dark Green
	RGB(128, 128, 0),		// Dark Yellow
	RGB(0, 0, 128),			// Dark Blue
	RGB(128, 0, 128),		// Dark Magenta
	RGB(0, 128, 128),		// Dark Cyan
	RGB(192, 192, 192),		// Light Grey
	RGB(128, 128, 128),		// Dark Grey
	RGB(255, 0, 0),			// Red
	RGB(0, 255, 0),			// Green
	RGB(255, 255, 0),		// Yellow
	RGB(0, 0, 255),			// Blue
	RGB(255, 0, 255),		// Magenta
	RGB(0, 255, 255),		// Cyan
	};

CComboColorPicker::CComboColorPicker()
{
	m_bInitialized = false;
}

CComboColorPicker::~CComboColorPicker()
{
}


BEGIN_MESSAGE_MAP(CComboColorPicker, CComboBox)
	//{{AFX_MSG_MAP(CComboColorPicker)
	ON_WM_CREATE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CComboColorPicker message handlers

int CComboColorPicker::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CComboBox::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	InitializeData();

	return 0;
}

void CComboColorPicker::PreSubclassWindow() 
{
	InitializeData();
	
	CComboBox::PreSubclassWindow();
}

void CComboColorPicker::InitializeData()
{
	int nItem;

	if (m_bInitialized)
		return;

	for (int nColor = 0; nColor < sizeof(m_rgStandardColors)/sizeof(COLORREF); nColor++)
	{
		nItem = AddString((LPCTSTR)m_rgStandardColors[nColor]);	// Here we could affect the sort order at run-time

		if (CB_ERRSPACE == nItem)
			break;
	}

	m_bInitialized = true;
}

void CComboColorPicker::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
	CDC dc;
	CBrush brushBlack;
	brushBlack.CreateStockObject(BLACK_BRUSH);
	
	if (!dc.Attach(lpDrawItemStruct->hDC))
		return;

	COLORREF rgbTextColor = dc.GetTextColor();
	COLORREF rgbBkColor = dc.GetBkColor();

	if (lpDrawItemStruct->itemAction & ODA_FOCUS)
	{
		dc.DrawFocusRect(&lpDrawItemStruct->rcItem);
	}
	else if (lpDrawItemStruct->itemAction & ODA_DRAWENTIRE)
	{
		if (lpDrawItemStruct->itemState & ODS_FOCUS)
			dc.DrawFocusRect(&lpDrawItemStruct->rcItem);
		else
			dc.ExtTextOut(0, 0, ETO_OPAQUE, &lpDrawItemStruct->rcItem, _T(""), 0, NULL);
	}

	if (0 <= (int)lpDrawItemStruct->itemID)	// Any item selected?
	{
		::InflateRect(&lpDrawItemStruct->rcItem, -2, -2);
		
		dc.FillSolidRect(&lpDrawItemStruct->rcItem, (COLORREF)lpDrawItemStruct->itemData);
		dc.FrameRect(&lpDrawItemStruct->rcItem, &brushBlack);
	}

	// Restore the DC state
	dc.SetTextColor(rgbTextColor);
	dc.SetBkColor(rgbBkColor);
	dc.Detach();
}

COLORREF CComboColorPicker::GetSelectedColor()
{
	int nItem = GetCurSel();
	if (CB_ERR == nItem)
		return RGB(0, 0, 0);	// Default to black if nothing is selected

	return m_rgStandardColors[nItem];
}
</FONT></TT></PRE>
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