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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.
In a dalog class header, add the following in the message map:
afx_msg LRESULT OnKickIdle(WPARAM , LPARAM );
In the implementation file:
#include <afxpriv.h>
In the message map add:
ON_MESSAGE(WM_KICKIDLE, OnKickIdle)
Implement the function:
LRESULT CMyDlg::OnKickIdle(WPARAM wParam, LPARAM lParam)
{
UpdateDialogControls(this, FALSE);
return 0;
}
I leave the bDisableIfNoHndler flag as FALSE so buttons without message
map entries are not disabled.
You can now use ON_UPDATE_COMMAND_UI message maps for enabling/disabling
controls, setting static text, etc.
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.
To use ON_UPDATE_COMMAND_UI in form views.
The kick idle message doesn’t work in form views, but there’s another
message in afxpriv.h called WM_IDLEUPDATECMDUI, that does.
In a form view class header, add the following in the message map:
afx_msg LRESULT OnIdleUpdateCmdUI(WPARAM , LPARAM );
In the implementation file:
#include <afxpriv.h>
In the message map add:
ON_MESSAGE(WM_IDLEUPDATECMDUI, OnIdleUpdateCmdUI)
Implement the function:
LRESULT CMyFormView::OnIdleUpdateCmdUI(WPARAM wParam, LPARAM)
{
UpdateDialogControls(this, FALSE);
return 0L;
}
ON_UPDATE_COMMAND_UI can now be used as described above.
Updated 21 March 1998
