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/* 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 <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "gtkvscale.h"
#include "gtksignal.h"
#include "gtkintl.h"
#define VALUE_SPACING 2
static gpointer parent_class;
static void gtk_vscale_class_init (GtkVScaleClass *klass);
static void gtk_vscale_init (GtkVScale *vscale);
static gboolean gtk_vscale_expose (GtkWidget *widget,
GdkEventExpose *event);
GtkType
gtk_vscale_get_type (void)
{
static GtkType vscale_type = 0;
if (!vscale_type)
{
static const GtkTypeInfo vscale_info =
{
"GtkVScale",
sizeof (GtkVScale),
sizeof (GtkVScaleClass),
(GtkClassInitFunc) gtk_vscale_class_init,
(GtkObjectInitFunc) gtk_vscale_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
vscale_type = gtk_type_unique (GTK_TYPE_SCALE, &vscale_info);
}
return vscale_type;
}
static void
gtk_vscale_class_init (GtkVScaleClass *class)
{
GObjectClass *gobject_class;
GtkWidgetClass *widget_class;
GtkRangeClass *range_class;
gobject_class = G_OBJECT_CLASS (class);
widget_class = GTK_WIDGET_CLASS (class);
range_class = GTK_RANGE_CLASS (class);
parent_class = g_type_class_peek_parent (class);
range_class->slider_detail = "vscale";
widget_class->expose_event = gtk_vscale_expose;
}
static void
gtk_vscale_init (GtkVScale *vscale)
{
GtkRange *range;
range = GTK_RANGE (vscale);
range->orientation = GTK_ORIENTATION_VERTICAL;
}
GtkWidget*
gtk_vscale_new (GtkAdjustment *adjustment)
{
GtkWidget *vscale;
vscale = gtk_widget_new (GTK_TYPE_VSCALE,
"adjustment", adjustment,
NULL);
return vscale;
}
/**
* 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.
*
* 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);
scale = g_object_new (GTK_TYPE_VSCALE,
"adjustment", adj,
NULL);
if (fabs (step) >= 1.0 || step == 0.0)
digits = 0;
else {
digits = abs ((gint) floor (log10 (fabs (step))));
if (digits > 5)
digits = 5;
}
gtk_scale_set_digits (scale, digits);
return GTK_WIDGET (scale);
}
static gboolean
gtk_vscale_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GtkRange *range;
GtkVScale *vscale;
GtkScale *scale;
range = GTK_RANGE (widget);
scale = GTK_SCALE (widget);
vscale = GTK_VSCALE (widget);
/* We need to chain up _first_ so the various geometry members of
* GtkRange struct are updated.
*/
if (GTK_WIDGET_CLASS (parent_class)->expose_event)
GTK_WIDGET_CLASS (parent_class)->expose_event (widget, event);
if (scale->draw_value)
{
PangoLayout *layout;
PangoRectangle logical_rect;
gchar *txt;
gint x, y;
GtkStateType state_type;
gint value_spacing;
gtk_widget_style_get (widget, "value_spacing", &value_spacing, NULL);
txt = _gtk_scale_format_value (scale,
GTK_RANGE (scale)->adjustment->value);
layout = gtk_widget_create_pango_layout (widget, txt);
g_free (txt);
pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
switch (scale->value_pos)
{
case GTK_POS_LEFT:
x = range->range_rect.x - logical_rect.width - value_spacing;
y = range->slider_start + (range->slider_end - range->slider_start - logical_rect.height) / 2;
y = CLAMP (y, 0, widget->allocation.height - logical_rect.height);
break;
case GTK_POS_RIGHT:
x = range->range_rect.x + range->range_rect.width + value_spacing;
y = range->slider_start + (range->slider_end - range->slider_start - logical_rect.height) / 2;
y = CLAMP (y, 0, widget->allocation.height - logical_rect.height);
break;
case GTK_POS_TOP:
x = range->range_rect.x + (range->range_rect.width - logical_rect.width) / 2;
y = range->range_rect.y - logical_rect.height - value_spacing;
break;
case GTK_POS_BOTTOM:
x = range->range_rect.x + (range->range_rect.width - logical_rect.width) / 2;
y = range->range_rect.y + range->range_rect.height + value_spacing;
break;
default:
g_return_val_if_reached (FALSE);
x = 0;
y = 0;
break;
}
x += widget->allocation.x;
y += widget->allocation.y;
state_type = GTK_STATE_NORMAL;
if (!GTK_WIDGET_IS_SENSITIVE (scale))
state_type = GTK_STATE_INSENSITIVE;
gtk_paint_layout (widget->style,
widget->window,
state_type,
FALSE,
NULL,
widget,
"vscale",
x, y,
layout);
g_object_unref (G_OBJECT (layout));
}
return FALSE;
}
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