How to change font size in CComboBox?

How to change font size in CComboBox and CListBox?
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Answers2000Connect With a Mentor Commented:
Send a WM_SETFONT message to the control.  this contains an HFONT of the font you want to use and a flag indicating if you want to redraw the control.


1. Associate a CComboBox or CListBox class with the control you want (e.g. use class wiz for dialog apps) - e.g. m_combo for CComboBox, or m_list for CListBox.

2. Use SendMessage to send the message.  If the control is on a dialog, and font doesn't change, then OnInitDialog is a good place to do this

m_combo.SendMessage( WM_SETFONT, (WPARAM)hFont, MAKELPARAM(TRUE,0) ) ; // FALSE instead of TRUE if you don't want immediate redraw

m_list.SendMessage( WM_SETFONT, (WPARAM)hFont, MAKELPARAM(TRUE,0) ) ; // FALSE instead of TRUE if you don't want immediate redraw

3. You can get the hFont a couple of ways

i. Use a stock font, in which case you do not need to clear up
hFont = (HFONT)::GetStockObject( SYSTEM_FIXED_FONT ) ;


ii. Create your own font.  In this case you need to clear up, set the font back before your dialog exits, and make sure any fonts you create are also deleted.

You create fonts using CreateFont or CreateFontIndirect.
You delete fonts using DeleteFont

    (a) Add member variable HFONT m_hOldFont to your dialog class
    (b) Add member variable HFONT m_hFont to your dialog class
    (c) In OnInitDialog you can create the font, based on a new LOGFONT that you supply, or by getting the current values

   m_hOldFont = (HFONT)m_list.SendMessage( WM_GETFONT, 0, 0 ) ;
   LOGFONT lf ;
   ::GetObject( (HGDIOBJ)m_hOldFont, sizeof lf, &lf ) ;
   lf.lfHeight = 32 ; // some new size
   m_hFont = ::CreateFontIndirect( &lf ) ;
   m_list.SendMessage( WM_SETFONT, (WPARAM)m_hFont, MAKELPARAM(TRUE,0) ) ;
   m_combo.SendMessage( WM_SETFONT, (WPARAM)m_hFont, MAKELPARAM(TRUE,0) ) ;

   (d) When destroy the dialog (e.g. OnOK) set font back, and delete the font you created
   m_list.SendMessage( WM_SETFONT, (WPARAM)m_hOldFont, MAKELPARAM(TRUE,0) ) ;
   m_combo.SendMessage( WM_SETFONT, (WPARAM)m_hOldFont, MAKELPARAM(TRUE,0) ) ;
   ::DeleteObject( m_hFont ) ;


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