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click_box.cc

/*
    Copyright (C) 1999 Paul Barton-Davis 

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id: click_box.cc,v 1.9 2005/07/26 21:49:36 sampo Exp $
*/

#include <iostream>
#include <cstdio> /* for sprintf, sigh ... */

#include <gtkmmext/utils.h>
#include <gtkmmext/click_box.h>

using namespace std;
using namespace Gtk;
using namespace Gtkmmext;
using namespace SigC;

ClickBox::ClickBox (Gtk::Adjustment *adjp, const string &name, bool round_to_steps)
      : AutoSpin (*adjp,0,round_to_steps)
{
      print_func = default_printer;
      print_arg = 0;

      set_name (name);
      add_events (GDK_BUTTON_RELEASE_MASK|
                GDK_BUTTON_PRESS_MASK|
                GDK_ENTER_NOTIFY_MASK|
                GDK_LEAVE_NOTIFY_MASK);
      set_label ();

      get_adjustment().value_changed.connect (slot(*this,&ClickBox::set_label));

      button_press_event.connect (slot (*this, &ClickBox::button_press_handler));
      button_release_event.connect (slot (*this, &ClickBox::button_release_handler));

      button_press_event.connect_after (slot (do_not_propagate));
      button_release_event.connect_after (slot (do_not_propagate));
}

ClickBox::~ClickBox ()

{
}

gint
ClickBox::button_press_handler (GdkEventButton* ev)
{
      Gtk::Main::grab_add (*this);
      AutoSpin::button_press (ev);
      return TRUE;
}

gint
ClickBox::button_release_handler (GdkEventButton* ev)
{
      switch (ev->button) {
      case 1:
      case 2:
      case 3:
            stop_spinning (0);
      default:
            Gtk::Main::grab_remove (*this);
            break;
      }
      return TRUE;
}

void
ClickBox::default_printer (char buf[32], Gtk::Adjustment &adj, 
                         void *ignored)
{
      sprintf (buf, "%.2f", adj.get_value());
}

void
ClickBox::set_label ()
{
      queue_draw ();
}

gint
ClickBox::expose_event_impl (GdkEventExpose *ev)
{
      /* Why do we do things like this rather than use a Gtk::Label?
         Because whenever Gtk::Label::set_label() is called, it
         triggers a recomputation of its own size, along with that
         of its container and on up the tree. That's intended
         to be unnecessary here.
      */

      Gtk::DrawingArea::expose_event_impl (ev);

      if (print_func) {

            char buf[32];
            gint swidth;
            gint sheight;
            gint lbearing;
            gint rbearing;
            gint ascent;
            gint descent;
            gint xoffset, yoffset;

            Gtk::Style *style = get_style();

            print_func (buf, get_adjustment(), print_arg);

            get_window().draw_rectangle (style->get_bg_gc(get_state()),
                                   TRUE, 0, 0, -1, -1);

            gdk_string_extents (style->get_font(), 
                            buf,
                            &lbearing,
                            &rbearing,
                            &swidth,
                            &ascent,
                            &descent);
            
            if (swidth > width()) {
                  xoffset = 2;
            } else {
                  xoffset = (width() - swidth) / 2;
            }

            sheight = ascent+descent;

            if (sheight > height()) {
                  yoffset = height() - 2;
            } else {
                  yoffset = height() - ((height() - (sheight))/2) - descent;
            }

            get_window().draw_string(style->get_font(), 
                               style->get_fg_gc(get_state()), xoffset, yoffset, buf);
      }

      return TRUE;
}

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