Re: Scrolled window resizing question.

[Paul Davis <pjdavis engineering uiowa edu>]

Bartek Kostrzewa wrote:

> pjdavis engineering uiowa edu wrote:
>  
>
> > Does anyone know how to make a scrolled window stop expanding once the need for
> > a scrollbar is gone?  I've been playing around with some different things but I
> > can't figure this one out.
> >
> > The goal is to have a scrolled window that will expand while it still needs a
> > scrollbar, and then once the scroll bar dissappears, the widget stops expanding
> > with further expansion of the containing widget.
> >
> > Thanks,
> > Paul Davis
> >
> > _______________________________________________
> > gtkmm-list mailing list
> > gtkmm-list gnome org
> > http://mail.gnome.org/mailman/listinfo/gtkmm-list
> >
> >    
>
> from scrolledwindow.h:
>
> void set_policy(PolicyType hscrollbar_policy, PolicyType
> vscrollbar_policy);
>
> from enums.h:
>
> enum PolicyType
> {
>  POLICY_ALWAYS,
>  POLICY_AUTOMATIC,
>  POLICY_NEVER
> };
>
> hence:
>
> MyScrolledWindow.set_policy(Gtk::POLICY_AUTOMATIC,Gtk::POLICY_AUTOMATIC);
>
> _______________________________________________
> gtkmm-list mailing list
> gtkmm-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtkmm-list
>  
Silly goose.

I understand the concept of setting the scrollbar policy. 


The idea is that *using* the automatic scroll bar policy, when the 
scroll bar dissappears, the scrolled window stops expanding. ( That 
means change size )

I wrote a short little test to show what I mean.

compile with:
g++ `pkg-config gtkmm-2.4 --cflags --libs` scrolltest.cc -o scrolltest

////// ScrollTest.cc
#include <gtkmm.h>

#include <sstream>
#include <string>

class ScrollTest : public Gtk::Window
{
   public:
           ScrollTest()
           {
               set_title( "Scroll Test" ) ;

               Gtk::VBox* scrolled_vbox = Gtk::manage( new Gtk::VBox() ) ;
               scrolled_vbox->set_homogeneous( true ) ;
               scrolled_vbox->set_border_width( 10 ) ;
               scrolled_vbox->show() ;

               Gtk::Label* label ;
               for( int i = 0 ; i < 10 ; i++ )
               {
                   std::stringstream ss ;
                   ss << "Label: " << ( i + 1 ) ;

                   label = Gtk::manage( new Gtk::Label( ss.str() ) ) ;
                   label->show() ;

                   scrolled_vbox->pack_start( *label, Gtk::PACK_SHRINK, 
0 ) ;
               }

               Gtk::ScrolledWindow* scrolled_window  = Gtk::manage( new 
Gtk::ScrolledWindow() ) ;
               scrolled_window->set_policy( Gtk::POLICY_NEVER, 
Gtk::POLICY_AUTOMATIC ) ;
               scrolled_window->show() ;
               scrolled_window->add( *scrolled_vbox ) ;

               Gtk::VBox* main_vbox = Gtk::manage( new Gtk::VBox() ) ;
               main_vbox->show() ;

               main_vbox->pack_start( *scrolled_window, 
Gtk::PACK_EXPAND_WIDGET, 0 ) ;
              
               label = Gtk::manage( new Gtk::Label( "Spacer" ) ) ;
               label->show() ;
               main_vbox->pack_start( *label, Gtk::PACK_EXPAND_WIDGET, 
0 ) ;

               add( *main_vbox ) ;
           }

           ~ScrollTest() {}
} ;

int
main( int argc, char* argv[] )
{
   Gtk::Main m( argc, argv ) ;
   ScrollTest test ;
   m.run( test ) ;
}