Re: Freeze a treeview column

[B McAndrews <bmcandrews efs-us com>]

I modified the program from yesterday to implement the viewport idea, it 
works, but now the title columns get scrolled away :)

use strict;

use Gtk2 -init;

my $model = Gtk2::ListStore->new (('Glib::Int')x16);
for (0..99) {
   $model->set ($model->append,
            0, $_,
            map { ($_, int (255 * rand())) }
               1..$model->get_n_columns-1
           );
}

my $window = Gtk2::Window->new;
my $paned = Gtk2::HPaned->new;
my $view1 = Gtk2::TreeView->new ($model);
my $view2 = Gtk2::TreeView->new ($model);
my $vp1 = Gtk2::Viewport->new;
my $vp2 = Gtk2::Viewport->new;

# left view, showing only the first column
my $col = Gtk2::TreeViewColumn->new_with_attributes
           ('Col 0', Gtk2::CellRendererText->new, text => 0);
$view1->append_column ($col);

for (1..$model->get_n_columns-1) {
   $col = Gtk2::TreeViewColumn->new_with_attributes
           ("Col $_", Gtk2::CellRendererText->new, text => $_);
   $view2->append_column ($col);
}

# right view, showing the remaining columns
$vp1->add($view1);
my $scroll1 = Gtk2::ScrolledWindow->new;


$paned->add1 ($vp1);

# linked scrolling
#my $scroll2 = Gtk2::ScrolledWindow->new (undef, $scroll1->get_vadjustment);

$vp2->add($view2);


$paned->add($vp2);
$scroll1->add_with_viewport($paned);



$window->add($scroll1);
$window->set_default_size (400, 400);
$window->signal_connect (destroy => sub {Gtk2->main_quit});
$window->show_all;
Gtk2->main;



Jan Hudec wrote:

> On Fri, Apr 16, 2004 at 10:22:17 -0400, muppet wrote:
>  
>
> > Jan Hudec said:
> >    
> >
> > > On Thu, Apr 15, 2004 at 12:46:05 -0400, muppet wrote:
> > >      
> > >
> > > > B McAndrews said:
> > > >        
> > > >
> > > > > I'd like to "freeze" a tree view column (the first one) so that
> > > > > horizontal scrolling will always show this column.  Is this posible? Or
> > > > > can I have some sort of split view?
> > > > >          
> > > > ahem: The GtkTreeView is neither a sheet widget nor microsoft excel.
> > > >
> > > > But what you *can* do is use a paned widget, with a single-column view in
> > > > the
> > > > left pane and a multi-column view in the right pane.  Both views can look at
> > > > the same model, and you can make them both use the same scrollbar
> > > > adjustments
> > > > so they will scroll together.  The trouble is that i don't know if it's
> > > > possible to hide the scrollbar on the left pane without implementing your
> > > > own
> > > > container.
> > > >        
> > > IIRC it's packed like:
> > >
> > >    +ScrolledWindow----+
> > >    |+Viewport------+ ^|
> > >    ||+the widget--+| v|
> > >    |||            || S|
> > >    |||            || c|
> > >    |||            || r|
> > >    |||            || o|
> > >    |||            || l|
> > >    ||+------------+| l|
> > >    |+--------------+ V|
> > >    |<HScrollBar---->  |
> > >    +------------------+
> > >
> > > And the scrolledwindow is just a 2x2 table, that shows/hides the
> > > scrollbars acoording to difference between it's allocation and child's
> > > requisition. It is possible to pack a viewport and scrollbars in
> > > a normal table, except the scrollbars must always be visible.
> > >
> > > Note: I am not actualy sure if ScrolledWindow uses Viewport internaly,
> > > but I am sure a Viewport exists.
> > >      
> > $scrolled_window->add_with_viewport ($child) won't buy you anything, because
> > a) the bottom scrollbar in the paned widget will not always be in view and b)
> > the TreeView is a natively scrolling widget, and using a viewport on it takes
> > a rather substantial performance hit, if i recall correctly.
> >    
>
> I am talking about NOT using scrolled_window.
>
>  
>
> > So, to do that with the proper scrollbars, you'll have to create your own
> > container widget with your own scrollbars and viewports, and use the
> > adjustments properly.  Getting that to work is something i don't know how to
> > do in five minutes, so forgive me if i don't include an example.
> >    
>
> I think you don't have to write anything. Just pack it like this:
>
>  +Table------------------------+
>  |+Viewport 1--++Viewport 2--+^|
>  ||+column 1--+||+the rest--+|V|
>  |||          ||||          ||S|
>  |||          ||||          ||c|
>  |||          ||||          ||r|
>  |||          ||||          ||o|
>  |||          ||||          ||l|
>  ||+----------+||+----------+|l|
>  |+------------++------------+V|
>  |              <HScrollBar==> |
>  +-----------------------------+
>
> And then bind the Adjustments to the viewports manualy.
>
> This should work like ScrolledWindow with both policies set to always,
> because all the scrolling functionality is in the viewport widget.
>
> -------------------------------------------------------------------------------
>                                                  Jan 'Bulb' Hudec <bulb ucw cz


--
Brian McAndrews
Archelon
bmcandrews efs-us com
312.788.6309