📄 dialog_updateui.shtml
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<HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="Author" CONTENT="Chris Maunder"> <TITLE>Dialog - Using ON_UPDATE_COMMAND_UI with dialogs (2)</TITLE></HEAD><BODY BGCOLOR="#FFFFFF"><table WIDTH="100%"><tr WIDTH="100%"><td align=center><!--#exec cgi="/cgi/ads.cgi"--><td></tr></table><CENTER><H3><FONT COLOR="#AOAO99">Using ON_UPDATE_COMMAND_UI with dialogs (2)</FONT></H3></CENTER><CENTER><H3><HR></H3></CENTER>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 idleprocessing. To get dialogs to work with the ON_UPDATE_COMMAND_UImessage maps, you need to trap the kick idle message and callUpdateDialogControls.<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 <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 messagemap entries are not disabled.<p>You can now use ON_UPDATE_COMMAND_UI message maps for enabling/disablingcontrols, setting static text, etc.<p>It works really well when you have two or more radio buttons thatenable/disable different groups of controls. Just have one OnUpdate...function for each group of controls that enables/disables depending onthe radio button selected, use IsDlgButtonChecked. Then add a messagemap 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 anothermessage 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 <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<HR><TABLE BORDER=0 WIDTH="100%"><TR><TD WIDTH="33%"><FONT SIZE=-1><A HREF="http://www.codeguru.com">Goto HomePage</A></FONT></TD><TD WIDTH="33%"><CENTER><FONT SIZE=-2>© 1997 - 1998 Zafir Anjum</FONT> </CENTER></TD><TD WIDTH="34%"><DIV ALIGN=right><FONT SIZE=-1>Contact me: <A HREF="mailto:zafir@home.com">zafir@home.com</A> </FONT></DIV></TD></TR></TABLE></BODY></HTML>⌨️ 快捷键说明
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