Claes
Tue Nov 09 01:45:41 CST 2004
Sounsd like you're looking for HDN_BEGINDRAG and HDN_ENDDRAG
private const int WM_NOTIFY = 0x004E;
private const int HDN_FIRST = -300
private const int HDN_BEGINDRAG = HDN_FIRST-10;
private const int HDN_ENDDRAG = HDN_FIRST-11;
Note that the AllowColumnReorder property must be true
/claes
"aualias" <aualias@newsgroups.nospam> wrote in message
news:#tKEF8cxEHA.1300@TK2MSFTNGP14.phx.gbl...
> Jeffrey,
>
> Thanks for the sample. I never actually checked for resizing - I just saw
> stuff on the Internet that indicated that no header messages are sent and
> assumed that it was true. What I looked at, and what I am most interested
> in, are the messages sent when you reorder the column headers.
>
> I did look for the reorder messages and found nothing that matched values
in
> commctrl.h. ( I did find some messages that came between the gaps in
> sequential values in commctrl.h, but I do not know what to do with them. )
>
> Alfredo
>
>
>
> ""Jeffrey Tan[MSFT]"" <v-jetan@online.microsoft.com> wrote in message
> news:NuZj75TxEHA.2544@cpmsftngxa10.phx.gbl...
> > Hi Alfredo,
> >
> > When the user drags the certain column header, the column header will
send
> > a WM_NOTIFY message with HDN_BEGINTRACKW(A) code to the ListView, and
when
> > the draging is over, a WM_NOTIFY message with HDN_ENDTRACKW(A) code will
> > also be sent to ListView control.
> >
> > So, we can inherit from the ListView class, override WndProc method,
then
> > intercept the WM_NOTIFY message with these 2 notify code to get the
column
> > width draging event. Sample code lists below:
> >
> > private const uint WM_NOTIFY=0x004E;
> > private const uint HDN_BEGINTRACKA = 0xFFFFFECE;
> > private const uint HDN_BEGINTRACKW = 0xFFFFFEBA;
> > private const uint HDN_ENDTRACKA = 0xFFFFFECD;
> > private const uint HDN_ENDTRACKW = 0xFFFFFEB9;
> >
> > [StructLayout(LayoutKind.Sequential)]
> > public struct NMHDR
> > {
> > public uint hwndFrom;
> > public uint idfrom;
> > public uint code;
> > }
> >
> > protected override void WndProc(ref Message m)
> > {
> > if(m.Msg==WM_NOTIFY)
> > {
> > NMHDR nm=(NMHDR)m.GetLParam(typeof(NMHDR));
> > if(nm.code==HDN_BEGINTRACKA||nm.code ==HDN_BEGINTRACKW)
> > {
> > //the draging begins, just save the column width setting, call
> > savecolumnsetting() method I listed below
> > }
> > else if(nm.code == HDN_ENDTRACKA ||nm.code == HDN_ENDTRACKW)
> > {
> > //draging is over
> > }
> > }
> > base.WndProc (ref m);
> > }
> > To record and restore the column width setting, we may write 2 methods
for
> > our own, like this:
> > ArrayList al=new ArrayList();
> > public void savecolumnsetting()
> > {
> > al.Clear();
> > for(int i=0;i<this.Columns.Count;i++)
> > {
> > al.Add(this.Columns[i].Width);
> > }
> > }
> >
> > public void restorecolumnsetting()
> > {
> > for(int i=0;i<this.Columns.Count;i++)
> > {
> > this.Columns[i].Width=(int)al[i];
> > }
> > }
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > Usage:
> > Because whenever we drag the column header, its original width setting
is
> > saved in arraylist, we can use a button to invoke restorecolumnsetting()
> > method, then when we clicked the button, the listview headers will
restore
> > to its original width.
> >
> > It works well on my side, I will attach the sample project in this reply
> > for your information.
> > ============================================================
> > Thank you for your patience and cooperation. If you have any questions
or
> > concerns, please feel free to post it in the group. I am standing by to
be
> > of assistance.
> >
> > Best regards,
> > Jeffrey Tan
> > Microsoft Online Partner Support
> > Get Secure! - www.microsoft.com/security
> > This posting is provided "as is" with no warranties and confers no
rights.
>
>