create event for double click between column header of listview?

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5 total messages Started by pera Fri, 04 Apr 2003 16:43

#17352

Author: pera
Date: Fri, 04 Apr 2003 16:43

8 lines
1172 bytes

Hi

Is there a way of getting the message for the double click between the
header columns of a listview.
The reason is that i need to call ListView->Refresh when the user is
"resizing the column width" by double clicking between the column headers.

;)

Re: create event for double click between column header of listview?

#17355

Author: Remy Lebeau (TeamB)
Date: Fri, 04 Apr 2003 17:41

21 lines
1795 bytes

"pera" <picka2@gmx.net> wrote in message
news:3e8db610$1@newsgroups.borland.com...

> Is there a way of getting the message for the double click
> between the header columns of a listview.

TListView itself does not expose that event.  You will have to subclass the
ListView in order to intercept the WM_NOTIFY message manually, testing for
the HDN_DIVIDERDBLCLICK (and optionally HDN_BEGINTRACK) notification.

> The reason is that i need to call ListView->Refresh when
> the user is "resizing the column width" by double clicking
> between the column headers.

If a column resizes, the ListView should already be refreshing itself
automatically, but apparently it only does that if the ListView is
owner-drawn.


Gambit

Re: create event for double click between column header of listview?

#17356

Author: pera
Date: Fri, 04 Apr 2003 18:21

14 lines
1366 bytes

Hi

Even if i am going to subclass the listview to get to the header message,
how do i get the resize execution bevor my listview->refresh()


something i tried but not worked the way i thought:

void __fastcall TForm1::MyOnMessage(MSG& Msg, bool& Handled)
{
   if (Msg.message == WM_LBUTTONDBLCLK)
      if (ListView->Focused())
           ListView->Refresh();
}

Re: create event for double click between column header of listview?

#17357

Author: Remy Lebeau (TeamB)
Date: Fri, 04 Apr 2003 19:19

51 lines
2573 bytes

"pera" <picka2@gmx.net> wrote in message
news:3e8dcd32$1@newsgroups.borland.com...

> void __fastcall TForm1::MyOnMessage(MSG& Msg, bool& Handled)

That suggests you're using the TApplication::OnMessage event.  If so, then
that is not the correct place to intercept the message in this situation.
As stated earlier, you need to subclass the ListView *directly*, and then
intercept WM_NOTIFY, not WM_LBUTTONDBLCLK.  A ListView control has a very
specific notification that is triggered when double-clicking on the dividers
of the header control.

This is a snippet of code I use in my own project:

    TWndMethod OldListViewProc;

    __fastcall TForm1::TForm1(TComponent *Owner)
        : TForm(Owner)
    {
        OldListViewProc = ListView1->WindowProc;
        ListView1->WindowProc = ListViewWindowProc;
    }

    void __fastcall TForm1::ListViewWindowProc(TMessage &Msg)
    {
        if( Msg.Msg == WM_NOTIFY )
        {
            const NMHDR *pnmh = (NMHDR*)Msg.LParam;
            if((pnmh->code == HDN_BEGINTRACKA) || (pnmh->code ==
HDN_BEGINTRACKW) ||
                (pnmh->code == HDN_DIVIDERDBLCLICKA) || (pnmh->code ==
HDN_DIVIDERDBLCLICKW))
            {
                // do something

                // if you want to swallow the message from being handled any
further:
                if( swallow the message )
                {
                    Msg.Result = TRUE;
                    return;
                }
            }
        }

        OldListViewProc(Msg);
    }


Gambit

Re: create event for double click between column header of listview?

#17358

Author: pera
Date: Fri, 04 Apr 2003 22:39

62 lines
2882 bytes

hi

works like a charme,
many thanks!

"Remy Lebeau (TeamB)" <gambit47@yahoo.com> schrieb im Newsbeitrag
news:3e8ddac0$1@newsgroups.borland.com...
>
> "pera" <picka2@gmx.net> wrote in message
> news:3e8dcd32$1@newsgroups.borland.com...
>
> > void __fastcall TForm1::MyOnMessage(MSG& Msg, bool& Handled)
>
> That suggests you're using the TApplication::OnMessage event.  If so, then
> that is not the correct place to intercept the message in this situation.
> As stated earlier, you need to subclass the ListView *directly*, and then
> intercept WM_NOTIFY, not WM_LBUTTONDBLCLK.  A ListView control has a very
> specific notification that is triggered when double-clicking on the
dividers
> of the header control.
>
> This is a snippet of code I use in my own project:
>
>     TWndMethod OldListViewProc;
>
>     __fastcall TForm1::TForm1(TComponent *Owner)
>         : TForm(Owner)
>     {
>         OldListViewProc = ListView1->WindowProc;
>         ListView1->WindowProc = ListViewWindowProc;
>     }
>
>     void __fastcall TForm1::ListViewWindowProc(TMessage &Msg)
>     {
>         if( Msg.Msg == WM_NOTIFY )
>         {
>             const NMHDR *pnmh = (NMHDR*)Msg.LParam;
>             if((pnmh->code == HDN_BEGINTRACKA) || (pnmh->code ==
> HDN_BEGINTRACKW) ||
>                 (pnmh->code == HDN_DIVIDERDBLCLICKA) || (pnmh->code ==
> HDN_DIVIDERDBLCLICKW))
>             {
>                 // do something
>
>                 // if you want to swallow the message from being handled
any
> further:
>                 if( swallow the message )
>                 {
>                     Msg.Result = TRUE;
>                     return;
>                 }
>             }
>         }
>
>         OldListViewProc(Msg);
>     }
>
>
> Gambit
>
>

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