1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-1999. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "gtkadjustment.h"
#include "gtksignal.h"
enum {
CHANGED,
VALUE_CHANGED,
LAST_SIGNAL
};
static void gtk_adjustment_class_init (GtkAdjustmentClass *klass);
static void gtk_adjustment_init (GtkAdjustment *adjustment);
static guint adjustment_signals[LAST_SIGNAL] = { 0 };
GtkType
gtk_adjustment_get_type (void)
{
static GtkType adjustment_type = 0;
if (!adjustment_type)
{
static const GtkTypeInfo adjustment_info =
{
"GtkAdjustment",
sizeof (GtkAdjustment),
sizeof (GtkAdjustmentClass),
(GtkClassInitFunc) gtk_adjustment_class_init,
(GtkObjectInitFunc) gtk_adjustment_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
adjustment_type = gtk_type_unique (GTK_TYPE_DATA, &adjustment_info);
}
return adjustment_type;
}
static void
gtk_adjustment_class_init (GtkAdjustmentClass *class)
{
GtkObjectClass *object_class;
object_class = (GtkObjectClass*) class;
adjustment_signals[CHANGED] =
gtk_signal_new ("changed",
GTK_RUN_FIRST | GTK_RUN_NO_RECURSE,
object_class->type,
GTK_SIGNAL_OFFSET (GtkAdjustmentClass, changed),
gtk_marshal_NONE__NONE,
GTK_TYPE_NONE, 0);
adjustment_signals[VALUE_CHANGED] =
gtk_signal_new ("value_changed",
GTK_RUN_FIRST | GTK_RUN_NO_RECURSE,
object_class->type,
GTK_SIGNAL_OFFSET (GtkAdjustmentClass, value_changed),
gtk_marshal_NONE__NONE,
GTK_TYPE_NONE, 0);
gtk_object_class_add_signals (object_class, adjustment_signals, LAST_SIGNAL);
class->changed = NULL;
class->value_changed = NULL;
}
static void
gtk_adjustment_init (GtkAdjustment *adjustment)
{
adjustment->value = 0.0;
adjustment->lower = 0.0;
adjustment->upper = 0.0;
adjustment->step_increment = 0.0;
adjustment->page_increment = 0.0;
adjustment->page_size = 0.0;
}
GtkObject*
gtk_adjustment_new (gfloat value,
gfloat lower,
gfloat upper,
gfloat step_increment,
gfloat page_increment,
gfloat page_size)
{
GtkAdjustment *adjustment;
adjustment = gtk_type_new (gtk_adjustment_get_type ());
adjustment->value = value;
adjustment->lower = lower;
adjustment->upper = upper;
adjustment->step_increment = step_increment;
adjustment->page_increment = page_increment;
adjustment->page_size = page_size;
return GTK_OBJECT (adjustment);
}
void
gtk_adjustment_set_value (GtkAdjustment *adjustment,
gfloat value)
{
g_return_if_fail (adjustment != NULL);
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
value = CLAMP (value, adjustment->lower, adjustment->upper);
if (value != adjustment->value)
{
adjustment->value = value;
gtk_adjustment_value_changed (adjustment);
}
}
void
gtk_adjustment_changed (GtkAdjustment *adjustment)
{
g_return_if_fail (adjustment != NULL);
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
gtk_signal_emit (GTK_OBJECT (adjustment), adjustment_signals[CHANGED]);
}
void
gtk_adjustment_value_changed (GtkAdjustment *adjustment)
{
g_return_if_fail (adjustment != NULL);
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
gtk_signal_emit (GTK_OBJECT (adjustment), adjustment_signals[VALUE_CHANGED]);
}
void
gtk_adjustment_clamp_page (GtkAdjustment *adjustment,
gfloat lower,
gfloat upper)
{
gint need_emission;
g_return_if_fail (adjustment != NULL);
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
lower = CLAMP (lower, adjustment->lower, adjustment->upper);
upper = CLAMP (upper, adjustment->lower, adjustment->upper);
need_emission = FALSE;
if (adjustment->value + adjustment->page_size < upper)
{
adjustment->value = upper - adjustment->page_size;
need_emission = TRUE;
}
if (adjustment->value > lower)
{
adjustment->value = lower;
need_emission = TRUE;
}
if (need_emission)
gtk_adjustment_value_changed (adjustment);
}
|
