1 /* GTK - The GIMP Toolkit
2 * Copyright (C) 2001 Red Hat, Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
22 * file for a list of people on the GTK+ Team. See the ChangeLog
23 * files for a list of changes. These files are distributed with
24 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
31 #include "gtkhscale.h"
35 static gpointer parent_class;
37 static void gtk_hscale_class_init (GtkHScaleClass *klass);
38 static void gtk_hscale_init (GtkHScale *hscale);
39 static gboolean gtk_hscale_expose (GtkWidget *widget,
40 GdkEventExpose *event);
42 static void gtk_hscale_get_layout_offsets (GtkScale *scale,
47 gtk_hscale_get_type (void)
49 static GType hscale_type = 0;
53 static const GTypeInfo hscale_info =
55 sizeof (GtkHScaleClass),
57 NULL, /* base_finalize */
58 (GClassInitFunc) gtk_hscale_class_init,
59 NULL, /* class_finalize */
60 NULL, /* class_data */
63 (GInstanceInitFunc) gtk_hscale_init,
66 hscale_type = g_type_register_static (GTK_TYPE_SCALE, I_("GtkHScale"),
74 gtk_hscale_class_init (GtkHScaleClass *class)
76 GtkWidgetClass *widget_class;
77 GtkRangeClass *range_class;
78 GtkScaleClass *scale_class;
80 widget_class = GTK_WIDGET_CLASS (class);
81 range_class = GTK_RANGE_CLASS (class);
82 scale_class = GTK_SCALE_CLASS (class);
84 parent_class = g_type_class_peek_parent (class);
86 range_class->slider_detail = "hscale";
88 scale_class->get_layout_offsets = gtk_hscale_get_layout_offsets;
90 widget_class->expose_event = gtk_hscale_expose;
94 gtk_hscale_init (GtkHScale *hscale)
98 range = GTK_RANGE (hscale);
100 range->orientation = GTK_ORIENTATION_HORIZONTAL;
101 range->flippable = TRUE;
105 gtk_hscale_new (GtkAdjustment *adjustment)
107 return g_object_new (GTK_TYPE_HSCALE, "adjustment", adjustment, NULL);
111 * gtk_hscale_new_with_range:
112 * @min: minimum value
113 * @max: maximum value
114 * @step: step increment (tick size) used with keyboard shortcuts
116 * Creates a new horizontal scale widget that lets the user input a
117 * number between @min and @max (including @min and @max) with the
118 * increment @step. @step must be nonzero; it's the distance the
119 * slider moves when using the arrow keys to adjust the scale value.
121 * Note that the way in which the precision is derived works best if @step
122 * is a power of ten. If the resulting precision is not suitable for your
123 * needs, use gtk_scale_set_digits() to correct it.
125 * Return value: a new #GtkHScale
128 gtk_hscale_new_with_range (gdouble min,
136 g_return_val_if_fail (min < max, NULL);
137 g_return_val_if_fail (step != 0.0, NULL);
139 adj = gtk_adjustment_new (min, min, max, step, 10 * step, 0);
141 scale = g_object_new (GTK_TYPE_HSCALE,
145 if (fabs (step) >= 1.0 || step == 0.0)
148 digits = abs ((gint) floor (log10 (fabs (step))));
153 gtk_scale_set_digits (scale, digits);
155 return GTK_WIDGET (scale);
159 gtk_hscale_expose (GtkWidget *widget,
160 GdkEventExpose *event)
164 scale = GTK_SCALE (widget);
166 /* We need to chain up _first_ so the various geometry members of
167 * GtkRange struct are updated.
169 if (GTK_WIDGET_CLASS (parent_class)->expose_event)
170 GTK_WIDGET_CLASS (parent_class)->expose_event (widget, event);
172 if (scale->draw_value)
176 GtkStateType state_type;
178 layout = gtk_scale_get_layout (scale);
179 gtk_scale_get_layout_offsets (scale, &x, &y);
181 state_type = GTK_STATE_NORMAL;
182 if (!GTK_WIDGET_IS_SENSITIVE (scale))
183 state_type = GTK_STATE_INSENSITIVE;
185 gtk_paint_layout (widget->style,
201 gtk_hscale_get_layout_offsets (GtkScale *scale,
208 PangoRectangle logical_rect;
211 widget = GTK_WIDGET (scale);
212 layout = gtk_scale_get_layout (scale);
222 gtk_widget_style_get (widget, "value-spacing", &value_spacing, NULL);
224 range = GTK_RANGE (widget);
225 scale = GTK_SCALE (widget);
227 pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
229 switch (scale->value_pos)
232 *x = range->range_rect.x - value_spacing - logical_rect.width;
233 *y = range->range_rect.y + (range->range_rect.height - logical_rect.height) / 2;
237 *x = range->range_rect.x + range->range_rect.width + value_spacing;
238 *y = range->range_rect.y + (range->range_rect.height - logical_rect.height) / 2;
242 *x = range->slider_start +
243 (range->slider_end - range->slider_start - logical_rect.width) / 2;
244 *x = CLAMP (*x, 0, widget->allocation.width - logical_rect.width);
245 *y = range->range_rect.y - logical_rect.height - value_spacing;
249 *x = range->slider_start +
250 (range->slider_end - range->slider_start - logical_rect.width) / 2;
251 *x = CLAMP (*x, 0, widget->allocation.width - logical_rect.width);
252 *y = range->range_rect.y + range->range_rect.height + value_spacing;
256 g_return_if_reached ();
262 *x += widget->allocation.x;
263 *y += widget->allocation.y;
266 #define __GTK_HSCALE_C__
267 #include "gtkaliasdef.c"