include/gtkknob.h

   1 /* gAlan - Graphical Audio Language
   2  * Copyright (C) 1999 Tony Garnock-Jones
   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #ifndef __GTK_KNOB_H__
  20 #define __GTK_KNOB_H__
  21
  22 #include <gdk/gdk.h>
  23 #include <gtk/gtkadjustment.h>
  24 #include <gtk/gtkwidget.h>
  25 #include <gdk-pixbuf/gdk-pixbuf.h>
  26
  27 #ifdef __cplusplus
  28 extern "C" {
  29 #endif
  30
  31 #define PIXMAPDIRIFY(filename) \
  32                 (SITE_PKGDATA_DIR G_DIR_SEPARATOR_S "pixmaps" G_DIR_SEPARATOR_S filename)
  33
  34 #define GTK_KNOB(obj)           GTK_CHECK_CAST(obj, gtk_knob_get_type(), GtkKnob)
  35 #define GTK_KNOB_CLASS(klass)   GTK_CHECK_CLASS_CAST(klass, gtk_knob_get_type(), GtkKnobClass)
  36 #define GTK_IS_KNOB(obj)        GTK_CHECK_TYPE(obj, gtk_knob_get_type())
  37
  38 typedef struct _GtkKnob        GtkKnob;
  39 typedef struct _GtkKnobClass   GtkKnobClass;
  40
  41 struct _GtkKnob {
  42   GtkWidget widget;
  43
  44   /* update policy (GTK_UPDATE_[CONTINUOUS/DELAYED/DISCONTINUOUS]) */
  45   guint policy : 2;
  46
  47   /* State of widget (to do with user interaction) */
  48   guint8 state;
  49   gint saved_x, saved_y;
  50
  51   /* ID of update timer, or 0 if none */
  52   guint32 timer;
  53
  54   /* Pixmap for knob */
  55   GdkPixbuf *pixbuf;
  56   /* Animation for knob... from animated gif */
  57   GList *anim_list;
  58
  59   /* Old values from adjustment stored so we know when something changes */
  60   gfloat old_value;
  61   gfloat old_lower;
  62   gfloat old_upper;
  63
  64   /* The adjustment object that stores the data for this knob */
  65   GtkAdjustment *adjustment;
  66 };
  67
  68 struct _GtkKnobClass
  69 {
  70   GtkWidgetClass parent_class;
  71 };
  72
  73 extern GtkWidget *gtk_knob_new(GtkAdjustment *adjustment);
  74 extern guint gtk_knob_get_type(void);
  75
  76 extern GtkAdjustment *gtk_knob_get_adjustment(GtkKnob *knob);
  77 extern void gtk_knob_set_update_policy(GtkKnob *knob, GtkUpdateType  policy);
  78
  79 extern void gtk_knob_set_adjustment(GtkKnob *knob, GtkAdjustment *adjustment);
  80
  81 #ifdef __cplusplus
  82 }
  83 #endif
  84
  85 #endif