1997-11-24 22:37:52 +00:00
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/* GTK - The GIMP Toolkit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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1998-04-13 02:02:47 +00:00
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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1997-11-24 22:37:52 +00:00
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*/
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#include <math.h>
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#include "gtkcontainer.h"
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#include "gtkscale.h"
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#define SCALE_CLASS(w) GTK_SCALE_CLASS (GTK_OBJECT (w)->klass)
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static void gtk_scale_class_init (GtkScaleClass *klass);
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static void gtk_scale_init (GtkScale *scale);
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static void gtk_scale_draw_background (GtkRange *range);
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static GtkRangeClass *parent_class = NULL;
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guint
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gtk_scale_get_type ()
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{
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static guint scale_type = 0;
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if (!scale_type)
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{
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GtkTypeInfo scale_info =
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{
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"GtkScale",
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sizeof (GtkScale),
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sizeof (GtkScaleClass),
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(GtkClassInitFunc) gtk_scale_class_init,
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(GtkObjectInitFunc) gtk_scale_init,
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1998-01-16 00:49:51 +00:00
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(GtkArgSetFunc) NULL,
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(GtkArgGetFunc) NULL,
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1997-11-24 22:37:52 +00:00
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};
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scale_type = gtk_type_unique (gtk_range_get_type (), &scale_info);
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}
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return scale_type;
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}
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static void
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gtk_scale_class_init (GtkScaleClass *class)
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{
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GtkObjectClass *object_class;
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GtkRangeClass *range_class;
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object_class = (GtkObjectClass*) class;
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range_class = (GtkRangeClass*) class;
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parent_class = gtk_type_class (gtk_range_get_type ());
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range_class->draw_background = gtk_scale_draw_background;
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class->slider_length = 31;
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class->value_spacing = 2;
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class->draw_value = NULL;
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}
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static void
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gtk_scale_init (GtkScale *scale)
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{
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GTK_WIDGET_SET_FLAGS (scale, GTK_CAN_FOCUS);
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GTK_RANGE (scale)->digits = 1;
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scale->draw_value = TRUE;
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scale->value_pos = GTK_POS_TOP;
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}
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void
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gtk_scale_set_digits (GtkScale *scale,
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gint digits)
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{
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g_return_if_fail (scale != NULL);
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g_return_if_fail (GTK_IS_SCALE (scale));
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if (GTK_RANGE (scale)->digits != digits)
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{
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GTK_RANGE (scale)->digits = digits;
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if (GTK_WIDGET_VISIBLE (scale) && GTK_WIDGET_MAPPED (scale))
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gtk_widget_queue_resize (GTK_WIDGET (scale));
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}
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}
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void
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gtk_scale_set_draw_value (GtkScale *scale,
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gint draw_value)
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{
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g_return_if_fail (scale != NULL);
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g_return_if_fail (GTK_IS_SCALE (scale));
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if (scale->draw_value != draw_value)
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{
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scale->draw_value = (draw_value != 0);
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if (GTK_WIDGET_VISIBLE (scale) && GTK_WIDGET_MAPPED (scale))
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gtk_widget_queue_resize (GTK_WIDGET (scale));
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}
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}
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void
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gtk_scale_set_value_pos (GtkScale *scale,
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GtkPositionType pos)
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{
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g_return_if_fail (scale != NULL);
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g_return_if_fail (GTK_IS_SCALE (scale));
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if (scale->value_pos != pos)
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{
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scale->value_pos = pos;
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if (GTK_WIDGET_VISIBLE (scale) && GTK_WIDGET_MAPPED (scale))
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gtk_widget_queue_resize (GTK_WIDGET (scale));
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}
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}
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gint
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gtk_scale_value_width (GtkScale *scale)
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{
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GtkRange *range;
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gchar buffer[128];
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gfloat value;
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gint temp;
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gint return_val;
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gint digits;
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gint i, j;
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g_return_val_if_fail (scale != NULL, 0);
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g_return_val_if_fail (GTK_IS_SCALE (scale), 0);
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return_val = 0;
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if (scale->draw_value)
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{
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range = GTK_RANGE (scale);
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value = ABS (range->adjustment->lower);
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if (value == 0) value = 1;
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digits = log10 (value) + 1;
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if (digits > 13)
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digits = 13;
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i = 0;
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if (range->adjustment->lower < 0)
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buffer[i++] = '-';
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for (j = 0; j < digits; j++)
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buffer[i++] = '0';
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if (GTK_RANGE (scale)->digits)
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buffer[i++] = '.';
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for (j = 0; j < GTK_RANGE (scale)->digits; j++)
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buffer[i++] = '0';
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buffer[i] = '\0';
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return_val = gdk_string_measure (GTK_WIDGET (scale)->style->font, buffer);
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value = ABS (range->adjustment->upper);
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if (value == 0) value = 1;
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digits = log10 (value) + 1;
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if (digits > 13)
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digits = 13;
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i = 0;
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if (range->adjustment->lower < 0)
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buffer[i++] = '-';
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for (j = 0; j < digits; j++)
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buffer[i++] = '0';
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if (GTK_RANGE (scale)->digits)
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buffer[i++] = '.';
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for (j = 0; j < GTK_RANGE (scale)->digits; j++)
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buffer[i++] = '0';
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buffer[i] = '\0';
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temp = gdk_string_measure (GTK_WIDGET (scale)->style->font, buffer);
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return_val = MAX (return_val, temp);
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}
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return return_val;
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}
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void
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gtk_scale_draw_value (GtkScale *scale)
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{
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g_return_if_fail (scale != NULL);
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g_return_if_fail (GTK_IS_SCALE (scale));
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if (SCALE_CLASS (scale)->draw_value)
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(* SCALE_CLASS (scale)->draw_value) (scale);
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}
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static void
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gtk_scale_draw_background (GtkRange *range)
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{
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g_return_if_fail (range != NULL);
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g_return_if_fail (GTK_IS_SCALE (range));
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gtk_scale_draw_value (GTK_SCALE (range));
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}
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