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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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <math.h>
#include "gtkcontainer.h"
#include "gtkscale.h"
#define SCALE_CLASS(w) GTK_SCALE_CLASS (GTK_OBJECT (w)->klass)
static void gtk_scale_class_init (GtkScaleClass *klass);
static void gtk_scale_init (GtkScale *scale);
static void gtk_scale_destroy (GtkObject *object);
static void gtk_scale_draw_background (GtkRange *range);
static GtkRangeClass *parent_class = NULL;
guint
gtk_scale_get_type ()
{
static guint scale_type = 0;
if (!scale_type)
{
GtkTypeInfo scale_info =
{
"GtkScale",
sizeof (GtkScale),
sizeof (GtkScaleClass),
(GtkClassInitFunc) gtk_scale_class_init,
(GtkObjectInitFunc) gtk_scale_init,
(GtkArgFunc) NULL,
};
scale_type = gtk_type_unique (gtk_range_get_type (), &scale_info);
}
return scale_type;
}
static void
gtk_scale_class_init (GtkScaleClass *class)
{
GtkObjectClass *object_class;
GtkRangeClass *range_class;
object_class = (GtkObjectClass*) class;
range_class = (GtkRangeClass*) class;
parent_class = gtk_type_class (gtk_range_get_type ());
object_class->destroy = gtk_scale_destroy;
range_class->draw_background = gtk_scale_draw_background;
class->slider_length = 31;
class->value_spacing = 2;
class->draw_value = NULL;
}
static void
gtk_scale_init (GtkScale *scale)
{
GTK_WIDGET_SET_FLAGS (scale, GTK_CAN_FOCUS);
GTK_RANGE (scale)->digits = 1;
scale->draw_value = TRUE;
scale->value_pos = GTK_POS_TOP;
}
void
gtk_scale_set_digits (GtkScale *scale,
gint digits)
{
g_return_if_fail (scale != NULL);
g_return_if_fail (GTK_IS_SCALE (scale));
if (GTK_RANGE (scale)->digits != digits)
{
GTK_RANGE (scale)->digits = digits;
if (GTK_WIDGET_VISIBLE (scale) && GTK_WIDGET_MAPPED (scale))
gtk_widget_queue_resize (GTK_WIDGET (scale));
}
}
void
gtk_scale_set_draw_value (GtkScale *scale,
gint draw_value)
{
g_return_if_fail (scale != NULL);
g_return_if_fail (GTK_IS_SCALE (scale));
if (scale->draw_value != draw_value)
{
scale->draw_value = (draw_value != 0);
if (GTK_WIDGET_VISIBLE (scale) && GTK_WIDGET_MAPPED (scale))
gtk_widget_queue_resize (GTK_WIDGET (scale));
}
}
void
gtk_scale_set_value_pos (GtkScale *scale,
GtkPositionType pos)
{
g_return_if_fail (scale != NULL);
g_return_if_fail (GTK_IS_SCALE (scale));
if (scale->value_pos != pos)
{
scale->value_pos = pos;
if (GTK_WIDGET_VISIBLE (scale) && GTK_WIDGET_MAPPED (scale))
gtk_widget_queue_resize (GTK_WIDGET (scale));
}
}
gint
gtk_scale_value_width (GtkScale *scale)
{
GtkRange *range;
gchar buffer[128];
gfloat value;
gint temp;
gint return_val;
gint digits;
gint i, j;
g_return_val_if_fail (scale != NULL, 0);
g_return_val_if_fail (GTK_IS_SCALE (scale), 0);
return_val = 0;
if (scale->draw_value)
{
range = GTK_RANGE (scale);
value = ABS (range->adjustment->lower);
if (value == 0) value = 1;
digits = log10 (value) + 1;
if (digits > 13)
digits = 13;
i = 0;
if (range->adjustment->lower < 0)
buffer[i++] = '-';
for (j = 0; j < digits; j++)
buffer[i++] = '0';
if (GTK_RANGE (scale)->digits)
buffer[i++] = '.';
for (j = 0; j < GTK_RANGE (scale)->digits; j++)
buffer[i++] = '0';
buffer[i] = '\0';
return_val = gdk_string_measure (GTK_WIDGET (scale)->style->font, buffer);
value = ABS (range->adjustment->upper);
if (value == 0) value = 1;
digits = log10 (value) + 1;
if (digits > 13)
digits = 13;
i = 0;
if (range->adjustment->lower < 0)
buffer[i++] = '-';
for (j = 0; j < digits; j++)
buffer[i++] = '0';
if (GTK_RANGE (scale)->digits)
buffer[i++] = '.';
for (j = 0; j < GTK_RANGE (scale)->digits; j++)
buffer[i++] = '0';
buffer[i] = '\0';
temp = gdk_string_measure (GTK_WIDGET (scale)->style->font, buffer);
return_val = MAX (return_val, temp);
}
return return_val;
}
void
gtk_scale_draw_value (GtkScale *scale)
{
g_return_if_fail (scale != NULL);
g_return_if_fail (GTK_IS_SCALE (scale));
if (SCALE_CLASS (scale)->draw_value)
(* SCALE_CLASS (scale)->draw_value) (scale);
}
static void
gtk_scale_destroy (GtkObject *object)
{
GtkRange *range;
g_return_if_fail (object != NULL);
g_return_if_fail (GTK_IS_SCALE (object));
range = GTK_RANGE (object);
if (GTK_OBJECT_CLASS (parent_class)->destroy)
(* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}
static void
gtk_scale_draw_background (GtkRange *range)
{
g_return_if_fail (range != NULL);
g_return_if_fail (GTK_IS_SCALE (range));
gtk_scale_draw_value (GTK_SCALE (range));
}
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