113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 2001 Red Hat, Inc.
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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 Lesser 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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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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*/
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/*
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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include "config.h"
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#include <math.h>
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#include <stdlib.h>
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#include "gtkhscale.h"
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#include "gtkorientable.h"
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G_DEFINE_TYPE (GtkHScale, gtk_hscale, GTK_TYPE_SCALE)
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static void
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gtk_hscale_class_init (GtkHScaleClass *class)
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{
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GtkRangeClass *range_class = GTK_RANGE_CLASS (class);
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range_class->slider_detail = "hscale";
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}
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static void
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gtk_hscale_init (GtkHScale *hscale)
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{
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gtk_orientable_set_orientation (GTK_ORIENTABLE (hscale),
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GTK_ORIENTATION_HORIZONTAL);
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}
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GtkWidget *
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gtk_hscale_new (GtkAdjustment *adjustment)
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{
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g_return_val_if_fail (adjustment == NULL || GTK_IS_ADJUSTMENT (adjustment),
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NULL);
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return g_object_new (GTK_TYPE_HSCALE,
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"adjustment", adjustment,
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NULL);
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}
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/**
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* gtk_hscale_new_with_range:
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* @min: minimum value
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* @max: maximum value
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* @step: step increment (tick size) used with keyboard shortcuts
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*
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* Creates a new horizontal scale widget that lets the user input a
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* number between @min and @max (including @min and @max) with the
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* increment @step. @step must be nonzero; it's the distance the
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* slider moves when using the arrow keys to adjust the scale value.
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*
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* Note that the way in which the precision is derived works best if @step
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* is a power of ten. If the resulting precision is not suitable for your
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* needs, use gtk_scale_set_digits() to correct it.
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*
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* Return value: a new #GtkHScale
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**/
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GtkWidget *
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gtk_hscale_new_with_range (gdouble min,
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gdouble max,
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gdouble step)
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{
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GtkAdjustment *adj;
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GtkScale *scale;
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gint digits;
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g_return_val_if_fail (min < max, NULL);
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g_return_val_if_fail (step != 0.0, NULL);
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adj = gtk_adjustment_new (min, min, max, step, 10 * step, 0);
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if (fabs (step) >= 1.0 || step == 0.0)
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{
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digits = 0;
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}
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else
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{
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digits = abs ((gint) floor (log10 (fabs (step))));
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if (digits > 5)
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digits = 5;
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}
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scale = g_object_new (GTK_TYPE_HSCALE,
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"adjustment", adj,
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"digits", digits,
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NULL);
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return GTK_WIDGET (scale);
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}
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