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   <TITLE>Misc - CStatic with bitmap sensitive to change in system colours</TITLE>
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<FONT COLOR="#AOAO99">CStatic with bitmap sensitive to change in system colours</FONT></H3></CENTER>

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<H3><HR></H3></CENTER>

This article was contributed by <A HREF="mailto:pal.k.tonder@matek.sintef.no">P錶 K. T鴑der</A>


<P>If an icon is used in a static control, it is sensitive to changes
in the system colours. This means that areas of the icon that have
background colour, is updated with the new background colour etc.

<P>As far as I can see, there is not the same if instead a bitmap is used
in the static control. Here is a small class that adds this
functionality for bitmaps. This is useful if for instance you add your
non-square logo in the About dialog box.

<P>The example figures are from the Database Sample
(Repeater Frequency Index) by Eric Hoagland.

<P><table>
	<tr><img src="without_syscol_static.jpg" tppabs="http://www.codeguru.com/controls/without_syscol_static.jpg"></tr>
	<tr>Without the CSysColStatic</tr>
</table>

<P><table>
	<tr><img src="with_syscol_static.jpg" tppabs="http://www.codeguru.com/controls/with_syscol_static.jpg"></tr>
	<tr>With the CSysColStatic</tr>
</table>

<P>To use the class you add a member variable to you dialog header:

<PRE><TT><FONT COLOR="#990000">
protected:
CSysColStatic m_Static;
</FONT></TT></PRE>

<P>Then you add the following to OnInitDialog:
<PRE><TT><FONT COLOR="#990000">
BOOL CMyApp::OnInitDialog()
{
	CDialog::OnInitDialog();

	m_Static.SubclassDlgItem(IDC_ARROW_STATIC,this);
	m_Static.ReloadBitmap(IDB_BITMAP1);

</FONT></TT></PRE>


<P>The last statement makes the static control reload the bitmap given by
IDB_BITMAP1
with correct system colours.

<P>The implementation of the static subclass is very simple:

<PRE><TT><FONT COLOR="#990000">
#if !defined(AFX_SYSCOLSTATIC_H__664DE301_4F7B_11D1_9E3D_00A0245800CF__INCLUDED_)
#define AFX_SYSCOLSTATIC_H__664DE301_4F7B_11D1_9E3D_00A0245800CF__INCLUDED_

#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000
// SysColStatic.h : header file
//

/////////////////////////////////////////////////////////////////////////////
// CSysColStatic window

class CSysColStatic : public CStatic
{
// Construction
public:
	CSysColStatic();
	void ReloadBitmap(int nImageID = -1);
// Attributes
public:

// Operations
public:

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CSysColStatic)
	//}}AFX_VIRTUAL

// Implementation
public:
	virtual ~CSysColStatic();

	// Generated message map functions
protected:
	int m_nImageID;
	//{{AFX_MSG(CSysColStatic)
	afx_msg void OnSysColorChange();
	//}}AFX_MSG

	DECLARE_MESSAGE_MAP()
};

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

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

#endif // !defined(AFX_SYSCOLSTATIC_H__664DE301_4F7B_11D1_9E3D_00A0245800CF__INCLUDED_)
</FONT></TT></PRE>


<P>ReloadBitmap reloads the bitmap identified by m_nImageID. ReloadBitmap is
also used to
set m_nImageID because I have not found a way to automatically extract the
bitmap ID
from the control. By loading the bitmap with LoadImage using the
LR_LOADMAP3DCOLORS style,
the colour changes are done automatically.

<P>A handler is added to respond to WM_SYSCOLORCHANGE messages. It simply
calls ReloadBitmap
without any arguments.


<PRE><TT><FONT COLOR="#990000">
// SysColStatic.cpp : implementation file
//

#include "stdafx.h"
#include "myapp.h"
#include "SysColStatic.h"

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

/////////////////////////////////////////////////////////////////////////////
// CSysColStatic

CSysColStatic::CSysColStatic()
{
	m_nImageID == -1;
}

CSysColStatic::~CSysColStatic()
{
}

void CSysColStatic::ReloadBitmap(int nImageID)
{
	if(nImageID != -1)
		m_nImageID = nImageID;

	if(m_nImageID == -1)
		return;

	HBITMAP hBmp = (HBITMAP)::LoadImage( AfxGetInstanceHandle(), 
            MAKEINTRESOURCE(m_nImageID), IMAGE_BITMAP, 0,0, LR_LOADMAP3DCOLORS );

	if( hBmp == NULL )
		return;

	hBmp = SetBitmap(hBmp);
	if(hBmp != NULL)
		::DeleteObject(hBmp);
}

BEGIN_MESSAGE_MAP(CSysColStatic, CStatic)
	//{{AFX_MSG_MAP(CSysColStatic)
	ON_WM_SYSCOLORCHANGE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CSysColStatic message handlers

void CSysColStatic::OnSysColorChange() 
{
	CStatic::OnSysColorChange();
	
	ReloadBitmap();	
}
</FONT></TT></PRE>





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