Re: [boost] A BOOST GUI Library

From: David Allan Finch (sarum_at_[hidden])
Date: 2001-04-02 09:07:01

Phlip wrote:

> Does this library use the "slots and signals" system that Qt invented and
> which I suspect Gtk+ emulates?

I don't know about Qt or Gtk+ sorry.

> I posit that a "quasi-standard" library, such as Boost always tries to be,
> should avoid using an implementation of the Observer Design Pattern that
> sucks, such as MFC's terribly heavy Message Maps.

I agree :-)

Here is an very old example. Note this does not show the libraries
off to it full advantage, as it also has 'derived method callbacks'
and 'observer pattern' on each event as well as 'C style'
callbacks (I do have examples of these somewhere).
We where also adding in a View-Controller system just before we
ended the project.

BTW the library was called 'Sticky' :-)

---8<----
//
// Input Test
//
// this is to test the new SSlider class
// DAF - 13 Mar 96

#include <sticky.hpp>

#include <math.h>

SSlider<double>*       s1;
SSlider<double>*       s2;
SSlider<double>*       s3;
SSlider<double>*       s4;

// **********************************************************************

void   set_sliders()
       {
       double  d1;
       double  d2;
       double  d3;
       double  d4;

       d2 << *s2;
       d4 << *s4;

       d1 = sqrt( d2 * d4 );
       d3 = sqrt( (d2 * d2) + ( d4 + d4 ) );

       *s1 << d1;
       *s3 << d3;
       }

// **********************************************************************

bool   slider_changed( SSlider<double>* s )
       {
       set_sliders();
       return( true );
       }

// **********************************************************************

int    StickyMain( int& argc, char* argv[] )
       {
       // THE SYSTEM SETUP

       SApplication    app( argc, argv );

       // THE FIRST WINDOW
       // This have a vertical layout panel

       STopWindow              main_window;
       SWorkspace              workspace;
       SVPane                  top_holder;
       SVPane                  Vholder;
       SHPane                  Hholder;
       SSlider<double>         slider1;
       SSlider<double>         slider2;
       SSlider<double>         slider3;
       SSlider<double>         slider4;

       s1 = &slider1;
       s2 = &slider2;
       s3 = &slider3;
       s4 = &slider4;

       slider1.min_value       = 0;
       slider1.max_value       = 1000;
       slider1.read_only       = true;
       slider1.orientation     = Horizontal;

       slider2.min_value       = 0;
       slider2.max_value       = 1000;
       slider2.read_only       = false;
       slider2.orientation     = Horizontal;
       slider2.move            += (SCallback)slider_changed;

       slider3.min_value       = 0;
       slider3.max_value       = 1000;
       slider3.read_only       = true;
       slider3.orientation     = Vertical;

       slider4.min_value       = 0;
       slider4.max_value       = 1000;
       slider4.read_only       = false;
       slider4.orientation     = Vertical;
       slider4.move            += (SCallback)slider_changed;

       slider2                 << (double)110;
       slider4                 << (double)110;

       set_sliders();

       app                     += main_window;
        main_window            += workspace;
         workspace             += top_holder;
          top_holder           += Vholder;
           Vholder             += slider1;
           Vholder             += slider2;
          top_holder           += Hholder;
           Hholder             += slider3;
           Hholder             += slider4;

       main_window.name        = "SSlider Test";

       return( app() );
       }
---8<----