col_noclick.shtml
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<HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="Author" CONTENT="Guy Gascoigne - Piggford"> <TITLE>CListCtrl - Disable clicking on selected report view columns</TITLE></HEAD><body background="../fancyhome/back.gif" bgcolor="#FFFFFF" link="#B50029" vlink="#8E2323" alink="#FF0000" bgproperties="fixed"><table WIDTH="100%"><tr WIDTH="100%"><td align=center><!--#exec cgi="/cgi/ads.cgi"--><td></tr></table><CENTER><H3><FONT COLOR="#AOAO99">Disable clicking on selected report view columns</FONT></H3></CENTER><CENTER><H3><HR></H3></CENTER><p>This article was contributed by <a href="mailto:Petr.Novotny@antek.cz">Petr Novotny</a></p><!-- start --><p>I have developed a short piece of code to disable clicking column headers for columns than cannot be sorted-by.</p><p>This code simply uses the customization of header control as presented in "Indicating sort order" article. I just added slight more functionality to that header control.</p><p>1. I define a prototype and a variable in a class declaration body:</p><pre><tt><FONT COLOR="#990000">public: typedef BOOL (*ColumnCheckF)(void *,int,LPARAM); void SetCallback(ColumnCheckF checkf=NULL,void * cbdata=NULL) { m_fColumnCheck=checkf; m_pCBData=cbdata; }private: ColumnCheckF m_fColumnCheck; void *m_pCBData;</tt></pre></font><p>After a click in a header, I find out the column (and I try to be wise and not disable clicking to resize columns) and ask the callback if the click is allowed (TRUE returned) or not.</p><p>It means, in the header (class declaration), I add</p><tt><pre><FONT COLOR="#990000"> // handlers afx_msg void OnLButtonDown(UINT,CPoint); DECLARE_MESSAGE_MAP()</tt></pre></font><p>and in the .CPP I add</p><tt><pre><FONT COLOR="#990000">BEGIN_MESSAGE_MAP(CCustHeaderCtrl,CHeaderCtrl) ON_WM_LBUTTONDOWN()END_MESSAGE_MAP()void CCustHeaderCtrl::OnLButtonDown(UINT flags,CPoint pt){ if (m_fColumnCheck!=NULL) { HD_ITEM hditem; CClientDC dc(this); int offset=dc.GetTextExtent(_T(" "),1).cx*2; int x_coord=pt.x; int column=0; hditem.mask=HDI_WIDTH; while (x_coord>((column==0)?0:offset)) { GetItem(column,&hditem); if (x_coord<hditem.cxy-offset) { // falls inside - query the func hditem.mask=HDI_LPARAM; GetItem(column,&hditem); if (!m_fColumnCheck(m_pCBData,column,hditem.lParam)) { // don't forward the message! return; } break; } x_coord-=hditem.cxy; column++; } } CHeaderCtrl::OnLButtonDown(flags,pt);}</tt></pre></font><p>The side effect of this code - it disables dragging the "disabled"columns. (That's because the header control never hears of LButtonDownmessage - I filter it of.)</p><P>Posted on: April 14, 98.<P><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>© 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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