Re: List view : no scroll bar and maximum length ?

On Mon, Feb 04, 2008 at 10:01:48PM +0100, Adrien wrote:
> Hi,
Hi,

> I've written a small mp3 player during the week-end, mainly in order
> to check whether it was possible to write a light and fast one with
> lablgtk (I miss foobar2000's interface under linux).
> 
> I've encountered some problems, especially with list view (which the
> biggest difference between a foobar ui and a winamp one :
> http://foobar2000.org/screenshots/img/main-simple.png.html )
> 
> My interface looks like : http://ocaml.yaxm.org/files/blatere/pr11n.png
> (1000 times the same file in order to see how it scaled)
> 
> First, I don't have any scroll bar though my playlist is 1000 elements
> long. I know there is the GRange module but I can't believe these
> scroll bars are not automatic.

Use a GBin.scrolled_window.

% diff -u second_try.ml.old second_try.ml
--- second_try.ml.old   2008-02-04 22:47:05.000000000 +0100
+++ second_try.ml       2008-02-04 22:55:02.000000000 +0100
@@ -39,7 +39,9 @@
 let rank_column=playlist#add Gobject.Data.string
 let fileinfo_column=playlist#add Gobject.Data.string
 
-let playlist_view=GTree.view ~packing:vbox#pack ()
+let sw = GBin.scrolled_window () ~packing: vbox#add
+  ~hpolicy: `AUTOMATIC ~vpolicy: `AUTOMATIC
+let playlist_view=GTree.view () ~packing:sw#add
 let _=playlist_view#append_column (GTree.view_column ~title:"Rank" ~renderer:(GTree.cell_renderer_text [], ["text", rank_column]) ())
 let _=playlist_view#append_column (GTree.view_column ~title:"File Info" ~renderer:(GTree.cell_renderer_text [], ["text", fileinfo_column]) ())

> Second, if I create a 2000 elements-long playlist, my program crashes
> with the following message:
>   The program 'blatère' received an X Window System error.
>   This probably reflects a bug in the program.
>   The error was 'BadAlloc (insufficient resources for operation)'.
>     (Details: serial 462 error_code 11 request_code 53 minor_code 0)
>     (Note to programmers: normally, X errors are reported asynchronously;
>      that is, you will receive the error a while after causing it.
>      To debug your program, run it with the --sync command line
>      option to change this behavior. You can then get a meaningful
>      backtrace from your debugger if you break on the gdk_x_error() function.)

It should not crash any longer once the scroll bar has been added.

HTH.