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   <TITLE>Dialog - Using ON_UPDATE_COMMAND_UI with dialogs (2)</TITLE>
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Using ON_UPDATE_COMMAND_UI with dialogs (2)
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This code was contributed by <A HREF="mailto:tim.mccoll@computershare.com.au">Tim McColl</a>

<p>afxpriv.h has a message, WM_KICKIDLE, that is sent during idle
processing.  To get dialogs to work with the ON_UPDATE_COMMAND_UI
message maps, you need to trap the kick idle message and call
UpdateDialogControls.

<p>In a dalog class header, add the following in the message map:
<PRE><TT><FONT COLOR="#990000">	afx_msg LRESULT OnKickIdle(WPARAM , LPARAM );
</PRE></TT></FONT>

<p>In the implementation file:
<PRE><TT><FONT COLOR="#990000">	#include &lt;afxpriv.h>
</PRE></TT></FONT>

<p>In the message map add:
<PRE><TT><FONT COLOR="#990000">	ON_MESSAGE(WM_KICKIDLE, OnKickIdle)
</PRE></TT></FONT>

<p>Implement the function:
<PRE><TT><FONT COLOR="#990000">	LRESULT CMyDlg::OnKickIdle(WPARAM wParam, LPARAM lParam)
	{
		UpdateDialogControls(this, FALSE);
		return 0;
	}
</PRE></TT></FONT>

<p>I leave the bDisableIfNoHndler flag as FALSE so buttons without message
map entries are not disabled.

<p>You can now use ON_UPDATE_COMMAND_UI message maps for enabling/disabling
controls, setting static text, etc.

<p>It works really well when you have two or more radio buttons that
enable/disable different groups of controls.  Just have one OnUpdate...
function for each group of controls that enables/disables depending on
the radio button selected, use IsDlgButtonChecked.  Then add a message
map entry for each control.

<h4>To use ON_UPDATE_COMMAND_UI in form views.</h4>

<p>The kick idle message doesn't work in form views, but there's another
message in afxpriv.h called WM_IDLEUPDATECMDUI, that does.

<p>In a form view class header, add the following in the message map:
<PRE><TT><FONT COLOR="#990000">	afx_msg LRESULT OnIdleUpdateCmdUI(WPARAM , LPARAM );
</PRE></TT></FONT>

<p>In the implementation file:
<PRE><TT><FONT COLOR="#990000">	#include &lt;afxpriv.h>
</PRE></TT></FONT>

<p>In the message map add:
<PRE><TT><FONT COLOR="#990000">	ON_MESSAGE(WM_IDLEUPDATECMDUI, OnIdleUpdateCmdUI)
</PRE></TT></FONT>

<p>Implement the function:
<PRE><TT><FONT COLOR="#990000">	LRESULT CMyFormView::OnIdleUpdateCmdUI(WPARAM wParam, LPARAM)
	{
		UpdateDialogControls(this, FALSE);
		return 0L;
	}
</PRE></TT></FONT>

<p>ON_UPDATE_COMMAND_UI can now be used as described above.

<P>

<p>Updated 21 March 1998
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