/* GTK - The GIMP Toolkit

 * Copyright (C) 2001 Red Hat, Inc.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser 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 1997-2000.  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 "config.h"

#include <math.h>

#include <stdlib.h>

#include "gtkvscale.h"

#include "gtkorientable.h"

#include "gtkalias.h"

/**

 * SECTION:gtkvscale

 * @Short_description: A vertical slider widget for selecting a value from a range

 * @Title: GtkVScale

 *

 * The #GtkVScale widget is used to allow the user to select a value using

 * a vertical slider. To create one, use gtk_hscale_new_with_range().

 *

 * The position to show the current value, and the number of decimal places

 * shown can be set using the parent #GtkScale class's functions.

 */

G_DEFINE_TYPE (GtkVScale, gtk_vscale, GTK_TYPE_SCALE)

static void

gtk_vscale_class_init (GtkVScaleClass *class)

{

  GtkRangeClass *range_class = GTK_RANGE_CLASS (class);

  range_class->slider_detail = "vscale";

}

static void

gtk_vscale_init (GtkVScale *vscale)

{

  gtk_orientable_set_orientation (GTK_ORIENTABLE (vscale),

                                  GTK_ORIENTATION_VERTICAL);

}

/**

 * gtk_vscale_new:

 * @adjustment: the #GtkAdjustment which sets the range of the scale.

 *

 * Creates a new #GtkVScale.

 *

 * Returns: a new #GtkVScale.

 */

GtkWidget *

gtk_vscale_new (GtkAdjustment *adjustment)

{

  g_return_val_if_fail (adjustment == NULL || GTK_IS_ADJUSTMENT (adjustment),

                        NULL);

  return g_object_new (GTK_TYPE_VSCALE,

                       "adjustment", adjustment,

                       NULL);

}

/**

 * gtk_vscale_new_with_range:

 * @min: minimum value

 * @max: maximum value

 * @step: step increment (tick size) used with keyboard shortcuts

 *

 * Creates a new vertical scale widget that lets the user input a

 * number between @min and @max (including @min and @max) with the

 * increment @step.  @step must be nonzero; it's the distance the

 * slider moves when using the arrow keys to adjust the scale value.

 *

 * Note that the way in which the precision is derived works best if @step

 * is a power of ten. If the resulting precision is not suitable for your

 * needs, use gtk_scale_set_digits() to correct it.

 *

 * Return value: a new #GtkVScale

 **/

GtkWidget *

gtk_vscale_new_with_range (gdouble min,

                           gdouble max,

                           gdouble step)

{

  GtkObject *adj;

  GtkScale *scale;

  gint digits;

  g_return_val_if_fail (min < max, NULL);

  g_return_val_if_fail (step != 0.0, NULL);

  adj = gtk_adjustment_new (min, min, max, step, 10 * step, 0);

  if (fabs (step) >= 1.0 || step == 0.0)

    {

      digits = 0;

    }

  else

    {

      digits = abs ((gint) floor (log10 (fabs (step))));

      if (digits > 5)

        digits = 5;

    }

  scale = g_object_new (GTK_TYPE_VSCALE,

                        "adjustment", adj,

                        "digits", digits,

                        NULL);

  return GTK_WIDGET (scale);

}

#define __GTK_VSCALE_C__

#include "gtkaliasdef.c"