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/* 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.
*/
#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)
{
GtkTypeInfo adjustment_info =
{
"GtkAdjustment",
sizeof (GtkAdjustment),
sizeof (GtkAdjustmentClass),
(GtkClassInitFunc) gtk_adjustment_class_init,
(GtkObjectInitFunc) gtk_adjustment_init,
/* reversed_1 */ NULL,
/* reversed_2 */ NULL,
(GtkClassInitFunc) NULL,
};
adjustment_type = gtk_type_unique (gtk_data_get_type (), &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_signal_default_marshaller,
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_signal_default_marshaller,
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);
}
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