1 /* GTK - The GIMP Toolkit
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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/.
39 static void gtk_scale_class_init (GtkScaleClass *klass);
40 static void gtk_scale_init (GtkScale *scale);
41 static void gtk_scale_set_arg (GtkObject *object,
44 static void gtk_scale_get_arg (GtkObject *object,
47 static void gtk_scale_map (GtkWidget *widget);
48 static void gtk_scale_unmap (GtkWidget *widget);
50 static void gtk_scale_draw_background (GtkRange *range);
53 static GtkRangeClass *parent_class = NULL;
57 gtk_scale_get_type (void)
59 static GtkType scale_type = 0;
63 static const GtkTypeInfo scale_info =
67 sizeof (GtkScaleClass),
68 (GtkClassInitFunc) gtk_scale_class_init,
69 (GtkObjectInitFunc) gtk_scale_init,
70 /* reserved_1 */ NULL,
71 /* reserved_2 */ NULL,
72 (GtkClassInitFunc) NULL,
75 scale_type = gtk_type_unique (GTK_TYPE_RANGE, &scale_info);
82 gtk_scale_class_init (GtkScaleClass *class)
84 GtkObjectClass *object_class;
85 GtkWidgetClass *widget_class;
86 GtkRangeClass *range_class;
88 object_class = (GtkObjectClass*) class;
89 range_class = (GtkRangeClass*) class;
90 widget_class = (GtkWidgetClass*) class;
92 parent_class = gtk_type_class (GTK_TYPE_RANGE);
94 gtk_object_add_arg_type ("GtkScale::digits",
98 gtk_object_add_arg_type ("GtkScale::draw_value",
102 gtk_object_add_arg_type ("GtkScale::value_pos",
103 GTK_TYPE_POSITION_TYPE,
107 object_class->set_arg = gtk_scale_set_arg;
108 object_class->get_arg = gtk_scale_get_arg;
110 widget_class->map = gtk_scale_map;
111 widget_class->unmap = gtk_scale_unmap;
113 range_class->draw_background = gtk_scale_draw_background;
115 gtk_widget_class_install_style_property (widget_class,
116 g_param_spec_int ("slider_length",
118 _("Length of scale's slider"),
123 class->value_spacing = 2;
124 class->draw_value = NULL;
128 gtk_scale_set_arg (GtkObject *object,
134 scale = GTK_SCALE (object);
139 gtk_scale_set_digits (scale, GTK_VALUE_INT (*arg));
142 gtk_scale_set_draw_value (scale, GTK_VALUE_BOOL (*arg));
145 gtk_scale_set_value_pos (scale, GTK_VALUE_ENUM (*arg));
153 gtk_scale_get_arg (GtkObject *object,
159 scale = GTK_SCALE (object);
164 GTK_VALUE_INT (*arg) = GTK_RANGE (scale)->digits;
167 GTK_VALUE_BOOL (*arg) = scale->draw_value;
170 GTK_VALUE_ENUM (*arg) = scale->value_pos;
173 arg->type = GTK_TYPE_INVALID;
179 gtk_scale_init (GtkScale *scale)
181 GTK_WIDGET_SET_FLAGS (scale, GTK_CAN_FOCUS);
182 GTK_WIDGET_SET_FLAGS (scale, GTK_NO_WINDOW);
183 GTK_RANGE (scale)->digits = 1;
184 scale->draw_value = TRUE;
185 scale->value_pos = GTK_POS_TOP;
189 gtk_scale_map (GtkWidget *widget)
193 g_return_if_fail (widget != NULL);
194 g_return_if_fail (GTK_IS_SCALE (widget));
196 GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
197 range = GTK_RANGE (widget);
199 gdk_window_show (range->trough);
203 gtk_scale_unmap (GtkWidget *widget)
207 g_return_if_fail (widget != NULL);
208 g_return_if_fail (GTK_IS_SCALE (widget));
210 GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
211 range = GTK_RANGE (widget);
213 if (GTK_WIDGET_NO_WINDOW (widget))
214 gtk_widget_queue_clear (widget);
216 gdk_window_hide (range->trough);
220 gtk_scale_set_digits (GtkScale *scale,
223 g_return_if_fail (scale != NULL);
224 g_return_if_fail (GTK_IS_SCALE (scale));
226 digits = CLAMP (digits, -1, 16);
228 if (GTK_RANGE (scale)->digits != digits)
230 GTK_RANGE (scale)->digits = digits;
232 gtk_widget_queue_resize (GTK_WIDGET (scale));
237 gtk_scale_set_draw_value (GtkScale *scale,
240 g_return_if_fail (scale != NULL);
241 g_return_if_fail (GTK_IS_SCALE (scale));
243 draw_value = draw_value != FALSE;
245 if (scale->draw_value != draw_value)
247 scale->draw_value = draw_value;
249 gtk_widget_queue_resize (GTK_WIDGET (scale));
254 gtk_scale_set_value_pos (GtkScale *scale,
257 g_return_if_fail (scale != NULL);
258 g_return_if_fail (GTK_IS_SCALE (scale));
260 if (scale->value_pos != pos)
262 scale->value_pos = pos;
264 if (GTK_WIDGET_VISIBLE (scale) && GTK_WIDGET_MAPPED (scale))
265 gtk_widget_queue_resize (GTK_WIDGET (scale));
270 gtk_scale_get_value_size (GtkScale *scale,
276 g_return_if_fail (scale != NULL);
277 g_return_if_fail (GTK_IS_SCALE (scale));
279 if (scale->draw_value)
282 PangoRectangle logical_rect;
288 range = GTK_RANGE (scale);
290 layout = gtk_widget_create_pango_layout (GTK_WIDGET (scale), NULL);
292 value = ABS (range->adjustment->lower);
293 if (value == 0) value = 1;
294 digits = log10 (value) + 1;
299 if (range->adjustment->lower < 0)
301 for (j = 0; j < digits; j++)
303 if (GTK_RANGE (scale)->digits)
305 for (j = 0; j < GTK_RANGE (scale)->digits; j++)
309 pango_layout_set_text (layout, buffer, i);
310 pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
313 *width = logical_rect.width;
315 *height = logical_rect.width;
317 value = ABS (range->adjustment->upper);
318 if (value == 0) value = 1;
319 digits = log10 (value) + 1;
324 if (range->adjustment->upper < 0)
326 for (j = 0; j < digits; j++)
328 if (GTK_RANGE (scale)->digits)
330 for (j = 0; j < GTK_RANGE (scale)->digits; j++)
334 pango_layout_set_text (layout, buffer, i);
335 pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
338 *width = MAX (*width, logical_rect.width);
340 *height = MAX (*height, logical_rect.height);
342 g_object_unref (G_OBJECT (layout));
355 gtk_scale_get_value_width (GtkScale *scale)
359 g_return_val_if_fail (scale != NULL, 0);
360 g_return_val_if_fail (GTK_IS_SCALE (scale), 0);
362 gtk_scale_get_value_size (scale, &width, NULL);
368 gtk_scale_draw_value (GtkScale *scale)
370 g_return_if_fail (scale != NULL);
371 g_return_if_fail (GTK_IS_SCALE (scale));
373 if (GTK_SCALE_GET_CLASS (scale)->draw_value)
374 GTK_SCALE_GET_CLASS (scale)->draw_value (scale);
379 gtk_scale_draw_background (GtkRange *range)
381 g_return_if_fail (range != NULL);
382 g_return_if_fail (GTK_IS_SCALE (range));
384 gtk_scale_draw_value (GTK_SCALE (range));