libs/gtkmm2ext/click_box.cc

   1 /*
   2     Copyright (C) 1999 Paul Barton-Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18     $Id$
  19 */
  20
  21 #include <iostream>
  22 #include <cstdio> /* for sprintf, sigh ... */
  23
  24 #include <gtkmm2ext/utils.h>
  25 #include <gtkmm2ext/click_box.h>
  26
  27 using namespace std;
  28 using namespace Gtk;
  29 using namespace Gtkmm2ext;
  30 using namespace sigc;
  31
  32 ClickBox::ClickBox (Gtk::Adjustment *adjp, const string &name, bool round_to_steps)
  33         : AutoSpin (*adjp,0,round_to_steps)
  34 {
  35         print_func = default_printer;
  36         print_arg = 0;
  37         layout = create_pango_layout ("");
  38         twidth = 0;
  39         theight = 0;
  40
  41
  42         add_events (Gdk::BUTTON_RELEASE_MASK|
  43                     Gdk::BUTTON_PRESS_MASK|
  44                     Gdk::ENTER_NOTIFY_MASK|
  45                     Gdk::LEAVE_NOTIFY_MASK);
  46
  47         get_adjustment().signal_value_changed().connect (mem_fun (*this, &ClickBox::set_label));
  48         signal_style_changed().connect (mem_fun (*this, &ClickBox::style_changed));
  49         signal_button_press_event().connect (mem_fun (*this, &ClickBox::button_press_handler));
  50         signal_button_release_event().connect (mem_fun (*this, &ClickBox::button_release_handler));
  51         set_name (name);
  52         set_label ();
  53 }
  54
  55 ClickBox::~ClickBox ()
  56 {
  57 }
  58
  59 bool
  60 ClickBox::button_press_handler (GdkEventButton* ev)
  61 {
  62         add_modal_grab();
  63         AutoSpin::button_press (ev);
  64         return true;
  65 }
  66
  67 bool
  68 ClickBox::button_release_handler (GdkEventButton* ev)
  69 {
  70         switch (ev->button) {
  71         case 1:
  72         case 2:
  73         case 3:
  74                 stop_spinning (0);
  75         default:
  76                 remove_modal_grab();
  77                 break;
  78         }
  79         return true;
  80 }
  81
  82 void
  83 ClickBox::default_printer (char buf[32], Gtk::Adjustment &adj,
  84                                void *)
  85 {
  86         sprintf (buf, "%.2f", adj.get_value());
  87 }
  88
  89 void
  90 ClickBox::set_label ()
  91 {
  92         if (!print_func) {
  93                 return;
  94         }
  95
  96         char buf[32];
  97
  98         print_func (buf, get_adjustment(), print_arg);
  99
 100         layout->set_text (buf);
 101         layout->get_pixel_size (twidth, theight);
 102
 103         queue_draw ();
 104 }
 105
 106 void
 107 ClickBox::style_changed (const Glib::RefPtr<Gtk::Style>&)
 108 {
 109         layout->context_changed ();
 110         layout->get_pixel_size (twidth, theight);
 111 }
 112
 113 bool
 114 ClickBox::on_expose_event (GdkEventExpose *ev)
 115 {
 116         /* Why do we do things like this rather than use a Gtk::Label?
 117            Because whenever Gtk::Label::set_label() is called, it
 118            triggers a recomputation of its own size, along with that
 119            of its container and on up the tree. That's intended
 120            to be unnecessary here.
 121         */
 122
 123         Gtk::DrawingArea::on_expose_event (ev);
 124
 125         if (print_func) {
 126
 127                 Glib::RefPtr<Gtk::Style> style (get_style());
 128                 Glib::RefPtr<Gdk::GC> fg_gc (style->get_fg_gc (Gtk::STATE_NORMAL));
 129                 Glib::RefPtr<Gdk::GC> bg_gc (style->get_bg_gc (Gtk::STATE_NORMAL));
 130                 Glib::RefPtr<Gdk::Window> win (get_window());
 131
 132                 GdkRectangle base_rect;
 133                 GdkRectangle draw_rect;
 134                 gint x, y, width, height, depth;
 135
 136                 win->get_geometry (x, y, width, height, depth);
 137
 138                 base_rect.width = width;
 139                 base_rect.height = height;
 140                 base_rect.x = 0;
 141                 base_rect.y = 0;
 142
 143                 gdk_rectangle_intersect (&ev->area, &base_rect, &draw_rect);
 144                 win->draw_rectangle (bg_gc, true, draw_rect.x, draw_rect.y, draw_rect.width, draw_rect.height);
 145
 146                 if (twidth && theight) {
 147                   win->draw_layout (fg_gc, (width - twidth) / 2, (height - theight) / 2, layout);
 148                 }
 149         }
 150
 151         return true;
 152 }