Pileus Git - ~andy/gtk/blob - gtk/gtkadjustment.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library 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 GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the Free
  16  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18 #include "gtkadjustment.h"
  19 #include "gtksignal.h"
  20
  21
  22 enum {
  23   CHANGED,
  24   VALUE_CHANGED,
  25   LAST_SIGNAL
  26 };
  27
  28
  29 static void gtk_adjustment_class_init (GtkAdjustmentClass *klass);
  30 static void gtk_adjustment_init       (GtkAdjustment      *adjustment);
  31
  32
  33 static guint adjustment_signals[LAST_SIGNAL] = { 0 };
  34
  35
  36 guint
  37 gtk_adjustment_get_type ()
  38 {
  39   static guint adjustment_type = 0;
  40
  41   if (!adjustment_type)
  42     {
  43       GtkTypeInfo adjustment_info =
  44       {
  45         "GtkAdjustment",
  46         sizeof (GtkAdjustment),
  47         sizeof (GtkAdjustmentClass),
  48         (GtkClassInitFunc) gtk_adjustment_class_init,
  49         (GtkObjectInitFunc) gtk_adjustment_init,
  50         (GtkArgSetFunc) NULL,
  51         (GtkArgGetFunc) NULL,
  52       };
  53
  54       adjustment_type = gtk_type_unique (gtk_data_get_type (), &adjustment_info);
  55     }
  56
  57   return adjustment_type;
  58 }
  59
  60 static void
  61 gtk_adjustment_class_init (GtkAdjustmentClass *class)
  62 {
  63   GtkObjectClass *object_class;
  64
  65   object_class = (GtkObjectClass*) class;
  66
  67   adjustment_signals[CHANGED] =
  68     gtk_signal_new ("changed",
  69                     GTK_RUN_FIRST | GTK_RUN_NO_RECURSE,
  70                     object_class->type,
  71                     GTK_SIGNAL_OFFSET (GtkAdjustmentClass, changed),
  72                     gtk_signal_default_marshaller,
  73                     GTK_TYPE_NONE, 0);
  74   adjustment_signals[VALUE_CHANGED] =
  75     gtk_signal_new ("value_changed",
  76                     GTK_RUN_FIRST | GTK_RUN_NO_RECURSE,
  77                     object_class->type,
  78                     GTK_SIGNAL_OFFSET (GtkAdjustmentClass, value_changed),
  79                     gtk_signal_default_marshaller,
  80                     GTK_TYPE_NONE, 0);
  81
  82   gtk_object_class_add_signals (object_class, adjustment_signals, LAST_SIGNAL);
  83
  84   class->changed = NULL;
  85   class->value_changed = NULL;
  86 }
  87
  88 static void
  89 gtk_adjustment_init (GtkAdjustment *adjustment)
  90 {
  91   adjustment->value = 0.0;
  92   adjustment->lower = 0.0;
  93   adjustment->upper = 0.0;
  94   adjustment->step_increment = 0.0;
  95   adjustment->page_increment = 0.0;
  96   adjustment->page_size = 0.0;
  97 }
  98
  99 GtkObject*
 100 gtk_adjustment_new (gfloat value,
 101                     gfloat lower,
 102                     gfloat upper,
 103                     gfloat step_increment,
 104                     gfloat page_increment,
 105                     gfloat page_size)
 106 {
 107   GtkAdjustment *adjustment;
 108
 109   adjustment = gtk_type_new (gtk_adjustment_get_type ());
 110
 111   adjustment->value = value;
 112   adjustment->lower = lower;
 113   adjustment->upper = upper;
 114   adjustment->step_increment = step_increment;
 115   adjustment->page_increment = page_increment;
 116   adjustment->page_size = page_size;
 117
 118   return GTK_OBJECT (adjustment);
 119 }
 120
 121 void
 122 gtk_adjustment_set_value (GtkAdjustment        *adjustment,
 123                           gfloat                value)
 124 {
 125   g_return_if_fail (adjustment != NULL);
 126   g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
 127
 128   adjustment->value = CLAMP (value, adjustment->lower, adjustment->upper);
 129
 130   gtk_signal_emit_by_name (GTK_OBJECT (adjustment), "value_changed");
 131 }