1 /* GTK - The GIMP Toolkit
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
3 * Copyright (C) 2001 Red Hat, Inc.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
20 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
21 * file for a list of people on the GTK+ Team. See the ChangeLog
22 * files for a list of changes. These files are distributed with
23 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
31 #include "gtkscaleprivate.h"
32 #include "gtkiconfactory.h"
33 #include "gtkicontheme.h"
34 #include "gtkmarshalers.h"
35 #include "gtkbindings.h"
36 #include "gtkorientable.h"
37 #include "gtktypebuiltins.h"
38 #include "gtkprivate.h"
40 #include "gtkbuildable.h"
41 #include "gtkbuilderprivate.h"
43 #include "a11y/gtkscaleaccessible.h"
48 * @Short_description: A slider widget for selecting a value from a range
51 * A GtkScale is a slider control used to select a numeric value.
52 * To use it, you'll probably want to investigate the methods on
53 * its base class, #GtkRange, in addition to the methods for GtkScale itself.
54 * To set the value of a scale, you would normally use gtk_range_set_value().
55 * To detect changes to the value, you would normally use the
56 * #GtkRange::value-changed signal.
58 * Note that using the same upper and lower bounds for the #GtkScale (through
59 * the #GtkRange methods) will hide the slider itself. This is useful for
60 * applications that want to show an undeterminate value on the scale, without
61 * changing the layout of the application (such as movie or music players).
63 * <refsect2 id="GtkScale-BUILDER-UI"><title>GtkScale as GtkBuildable</title>
64 * GtkScale supports a custom <marks> element, which
65 * can contain multiple <mark> elements. The "value" and "position"
66 * attributes have the same meaning as gtk_scale_add_mark() parameters of the
67 * same name. If the element is not empty, its content is taken as the markup
68 * to show at the mark. It can be translated with the usual "translatable and
69 * "context" attributes.
74 #define MAX_DIGITS (64) /* don't change this,
75 * a) you don't need to and
76 * b) you might cause buffer owerflows in
77 * unrelated code portions otherwise
80 typedef struct _GtkScaleMark GtkScaleMark;
82 struct _GtkScalePrivate
98 GtkPositionType position; /* always GTK_POS_TOP or GTK_POS_BOTTOM */
114 static guint signals[LAST_SIGNAL];
116 static void gtk_scale_set_property (GObject *object,
120 static void gtk_scale_get_property (GObject *object,
124 static void gtk_scale_get_preferred_width (GtkWidget *widget,
127 static void gtk_scale_get_preferred_height (GtkWidget *widget,
130 static void gtk_scale_style_updated (GtkWidget *widget);
131 static void gtk_scale_get_range_border (GtkRange *range,
133 static void gtk_scale_get_mark_label_size (GtkScale *scale,
134 GtkPositionType position,
141 static void gtk_scale_finalize (GObject *object);
142 static void gtk_scale_screen_changed (GtkWidget *widget,
143 GdkScreen *old_screen);
144 static gboolean gtk_scale_draw (GtkWidget *widget,
146 static void gtk_scale_real_get_layout_offsets (GtkScale *scale,
149 static void gtk_scale_buildable_interface_init (GtkBuildableIface *iface);
150 static gboolean gtk_scale_buildable_custom_tag_start (GtkBuildable *buildable,
153 const gchar *tagname,
154 GMarkupParser *parser,
156 static void gtk_scale_buildable_custom_finished (GtkBuildable *buildable,
159 const gchar *tagname,
163 G_DEFINE_TYPE_WITH_CODE (GtkScale, gtk_scale, GTK_TYPE_RANGE,
164 G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
165 gtk_scale_buildable_interface_init))
168 compare_marks (gconstpointer a, gconstpointer b, gpointer data)
170 gboolean inverted = GPOINTER_TO_INT (data);
172 const GtkScaleMark *ma, *mb;
174 val = inverted ? -1 : 1;
178 return (ma->value > mb->value) ? val : ((ma->value < mb->value) ? -val : 0);
182 gtk_scale_notify (GObject *object,
185 if (strcmp (pspec->name, "orientation") == 0)
187 GtkOrientation orientation;
189 orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (object));
190 gtk_range_set_flippable (GTK_RANGE (object),
191 orientation == GTK_ORIENTATION_HORIZONTAL);
193 else if (strcmp (pspec->name, "inverted") == 0)
195 GtkScale *scale = GTK_SCALE (object);
201 scale->priv->marks = g_slist_sort_with_data (scale->priv->marks,
203 GINT_TO_POINTER (gtk_range_get_inverted (GTK_RANGE (scale))));
205 n = g_slist_length (scale->priv->marks);
206 values = g_new (gdouble, n);
207 for (m = scale->priv->marks, i = 0; m; m = m->next, i++)
210 values[i] = mark->value;
213 _gtk_range_set_stop_values (GTK_RANGE (scale), values, n);
218 if (G_OBJECT_CLASS (gtk_scale_parent_class)->notify)
219 G_OBJECT_CLASS (gtk_scale_parent_class)->notify (object, pspec);
223 #define add_slider_binding(binding_set, keyval, mask, scroll) \
224 gtk_binding_entry_add_signal (binding_set, keyval, mask, \
225 I_("move-slider"), 1, \
226 GTK_TYPE_SCROLL_TYPE, scroll)
229 gtk_scale_class_init (GtkScaleClass *class)
231 GObjectClass *gobject_class;
232 GtkWidgetClass *widget_class;
233 GtkRangeClass *range_class;
234 GtkBindingSet *binding_set;
236 gobject_class = G_OBJECT_CLASS (class);
237 range_class = (GtkRangeClass*) class;
238 widget_class = (GtkWidgetClass*) class;
240 gobject_class->set_property = gtk_scale_set_property;
241 gobject_class->get_property = gtk_scale_get_property;
242 gobject_class->notify = gtk_scale_notify;
243 gobject_class->finalize = gtk_scale_finalize;
245 widget_class->style_updated = gtk_scale_style_updated;
246 widget_class->screen_changed = gtk_scale_screen_changed;
247 widget_class->draw = gtk_scale_draw;
248 widget_class->get_preferred_width = gtk_scale_get_preferred_width;
249 widget_class->get_preferred_height = gtk_scale_get_preferred_height;
251 range_class->slider_detail = "Xscale";
252 range_class->get_range_border = gtk_scale_get_range_border;
254 class->get_layout_offsets = gtk_scale_real_get_layout_offsets;
257 * GtkScale::format-value:
258 * @scale: the object which received the signal
259 * @value: the value to format
261 * Signal which allows you to change how the scale value is displayed.
262 * Connect a signal handler which returns an allocated string representing
263 * @value. That string will then be used to display the scale's value.
265 * Here's an example signal handler which displays a value 1.0 as
266 * with "-->1.0<--".
269 * format_value_callback (GtkScale *scale,
272 * return g_strdup_printf ("-->%0.*g<--",
273 * gtk_scale_get_digits (scale), value);
277 * Return value: allocated string representing @value
279 signals[FORMAT_VALUE] =
280 g_signal_new (I_("format-value"),
281 G_TYPE_FROM_CLASS (gobject_class),
283 G_STRUCT_OFFSET (GtkScaleClass, format_value),
284 _gtk_single_string_accumulator, NULL,
285 _gtk_marshal_STRING__DOUBLE,
289 g_object_class_install_property (gobject_class,
291 g_param_spec_int ("digits",
293 P_("The number of decimal places that are displayed in the value"),
297 GTK_PARAM_READWRITE));
299 g_object_class_install_property (gobject_class,
301 g_param_spec_boolean ("draw-value",
303 P_("Whether the current value is displayed as a string next to the slider"),
305 GTK_PARAM_READWRITE));
307 g_object_class_install_property (gobject_class,
309 g_param_spec_boolean ("has-origin",
311 P_("Whether the scale has an origin"),
313 GTK_PARAM_READWRITE));
315 g_object_class_install_property (gobject_class,
317 g_param_spec_enum ("value-pos",
318 P_("Value Position"),
319 P_("The position in which the current value is displayed"),
320 GTK_TYPE_POSITION_TYPE,
322 GTK_PARAM_READWRITE));
324 gtk_widget_class_install_style_property (widget_class,
325 g_param_spec_int ("slider-length",
327 P_("Length of scale's slider"),
331 GTK_PARAM_READABLE));
333 gtk_widget_class_install_style_property (widget_class,
334 g_param_spec_int ("value-spacing",
336 P_("Space between value text and the slider/trough area"),
340 GTK_PARAM_READABLE));
342 /* All bindings (even arrow keys) are on both h/v scale, because
343 * blind users etc. don't care about scale orientation.
346 binding_set = gtk_binding_set_by_class (class);
348 add_slider_binding (binding_set, GDK_KEY_Left, 0,
349 GTK_SCROLL_STEP_LEFT);
351 add_slider_binding (binding_set, GDK_KEY_Left, GDK_CONTROL_MASK,
352 GTK_SCROLL_PAGE_LEFT);
354 add_slider_binding (binding_set, GDK_KEY_KP_Left, 0,
355 GTK_SCROLL_STEP_LEFT);
357 add_slider_binding (binding_set, GDK_KEY_KP_Left, GDK_CONTROL_MASK,
358 GTK_SCROLL_PAGE_LEFT);
360 add_slider_binding (binding_set, GDK_KEY_Right, 0,
361 GTK_SCROLL_STEP_RIGHT);
363 add_slider_binding (binding_set, GDK_KEY_Right, GDK_CONTROL_MASK,
364 GTK_SCROLL_PAGE_RIGHT);
366 add_slider_binding (binding_set, GDK_KEY_KP_Right, 0,
367 GTK_SCROLL_STEP_RIGHT);
369 add_slider_binding (binding_set, GDK_KEY_KP_Right, GDK_CONTROL_MASK,
370 GTK_SCROLL_PAGE_RIGHT);
372 add_slider_binding (binding_set, GDK_KEY_Up, 0,
375 add_slider_binding (binding_set, GDK_KEY_Up, GDK_CONTROL_MASK,
378 add_slider_binding (binding_set, GDK_KEY_KP_Up, 0,
381 add_slider_binding (binding_set, GDK_KEY_KP_Up, GDK_CONTROL_MASK,
384 add_slider_binding (binding_set, GDK_KEY_Down, 0,
385 GTK_SCROLL_STEP_DOWN);
387 add_slider_binding (binding_set, GDK_KEY_Down, GDK_CONTROL_MASK,
388 GTK_SCROLL_PAGE_DOWN);
390 add_slider_binding (binding_set, GDK_KEY_KP_Down, 0,
391 GTK_SCROLL_STEP_DOWN);
393 add_slider_binding (binding_set, GDK_KEY_KP_Down, GDK_CONTROL_MASK,
394 GTK_SCROLL_PAGE_DOWN);
396 add_slider_binding (binding_set, GDK_KEY_Page_Up, GDK_CONTROL_MASK,
397 GTK_SCROLL_PAGE_LEFT);
399 add_slider_binding (binding_set, GDK_KEY_KP_Page_Up, GDK_CONTROL_MASK,
400 GTK_SCROLL_PAGE_LEFT);
402 add_slider_binding (binding_set, GDK_KEY_Page_Up, 0,
405 add_slider_binding (binding_set, GDK_KEY_KP_Page_Up, 0,
408 add_slider_binding (binding_set, GDK_KEY_Page_Down, GDK_CONTROL_MASK,
409 GTK_SCROLL_PAGE_RIGHT);
411 add_slider_binding (binding_set, GDK_KEY_KP_Page_Down, GDK_CONTROL_MASK,
412 GTK_SCROLL_PAGE_RIGHT);
414 add_slider_binding (binding_set, GDK_KEY_Page_Down, 0,
415 GTK_SCROLL_PAGE_DOWN);
417 add_slider_binding (binding_set, GDK_KEY_KP_Page_Down, 0,
418 GTK_SCROLL_PAGE_DOWN);
420 /* Logical bindings (vs. visual bindings above) */
422 add_slider_binding (binding_set, GDK_KEY_plus, 0,
423 GTK_SCROLL_STEP_FORWARD);
425 add_slider_binding (binding_set, GDK_KEY_minus, 0,
426 GTK_SCROLL_STEP_BACKWARD);
428 add_slider_binding (binding_set, GDK_KEY_plus, GDK_CONTROL_MASK,
429 GTK_SCROLL_PAGE_FORWARD);
431 add_slider_binding (binding_set, GDK_KEY_minus, GDK_CONTROL_MASK,
432 GTK_SCROLL_PAGE_BACKWARD);
435 add_slider_binding (binding_set, GDK_KEY_KP_Add, 0,
436 GTK_SCROLL_STEP_FORWARD);
438 add_slider_binding (binding_set, GDK_KEY_KP_Subtract, 0,
439 GTK_SCROLL_STEP_BACKWARD);
441 add_slider_binding (binding_set, GDK_KEY_KP_Add, GDK_CONTROL_MASK,
442 GTK_SCROLL_PAGE_FORWARD);
444 add_slider_binding (binding_set, GDK_KEY_KP_Subtract, GDK_CONTROL_MASK,
445 GTK_SCROLL_PAGE_BACKWARD);
448 add_slider_binding (binding_set, GDK_KEY_Home, 0,
451 add_slider_binding (binding_set, GDK_KEY_KP_Home, 0,
454 add_slider_binding (binding_set, GDK_KEY_End, 0,
457 add_slider_binding (binding_set, GDK_KEY_KP_End, 0,
460 g_type_class_add_private (gobject_class, sizeof (GtkScalePrivate));
462 gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_SCALE_ACCESSIBLE);
466 gtk_scale_init (GtkScale *scale)
468 GtkScalePrivate *priv;
469 GtkRange *range = GTK_RANGE (scale);
470 GtkStyleContext *context;
472 scale->priv = G_TYPE_INSTANCE_GET_PRIVATE (scale,
477 gtk_widget_set_can_focus (GTK_WIDGET (scale), TRUE);
479 gtk_range_set_slider_size_fixed (range, TRUE);
481 _gtk_range_set_has_origin (range, TRUE);
483 priv->draw_value = TRUE;
484 priv->value_pos = GTK_POS_TOP;
486 gtk_range_set_round_digits (range, priv->digits);
488 gtk_range_set_flippable (range,
489 gtk_orientable_get_orientation (GTK_ORIENTABLE (range))== GTK_ORIENTATION_HORIZONTAL);
491 context = gtk_widget_get_style_context (GTK_WIDGET (scale));
492 gtk_style_context_add_class (context, GTK_STYLE_CLASS_SCALE);
496 gtk_scale_set_property (GObject *object,
503 scale = GTK_SCALE (object);
508 gtk_scale_set_digits (scale, g_value_get_int (value));
510 case PROP_DRAW_VALUE:
511 gtk_scale_set_draw_value (scale, g_value_get_boolean (value));
513 case PROP_HAS_ORIGIN:
514 gtk_scale_set_has_origin (scale, g_value_get_boolean (value));
517 gtk_scale_set_value_pos (scale, g_value_get_enum (value));
520 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
526 gtk_scale_get_property (GObject *object,
531 GtkScale *scale = GTK_SCALE (object);
532 GtkScalePrivate *priv = scale->priv;
537 g_value_set_int (value, priv->digits);
539 case PROP_DRAW_VALUE:
540 g_value_set_boolean (value, priv->draw_value);
542 case PROP_HAS_ORIGIN:
543 g_value_set_boolean (value, gtk_scale_get_has_origin (scale));
546 g_value_set_enum (value, priv->value_pos);
549 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
556 * @orientation: the scale's orientation.
557 * @adjustment: (allow-none): the #GtkAdjustment which sets the range
558 * of the scale, or %NULL to create a new adjustment.
560 * Creates a new #GtkScale.
562 * Return value: a new #GtkScale
567 gtk_scale_new (GtkOrientation orientation,
568 GtkAdjustment *adjustment)
570 g_return_val_if_fail (adjustment == NULL || GTK_IS_ADJUSTMENT (adjustment),
573 return g_object_new (GTK_TYPE_SCALE,
574 "orientation", orientation,
575 "adjustment", adjustment,
580 * gtk_scale_new_with_range:
581 * @orientation: the scale's orientation.
582 * @min: minimum value
583 * @max: maximum value
584 * @step: step increment (tick size) used with keyboard shortcuts
586 * Creates a new scale widget with the given orientation that lets the
587 * user input a number between @min and @max (including @min and @max)
588 * with the increment @step. @step must be nonzero; it's the distance
589 * the slider moves when using the arrow keys to adjust the scale
592 * Note that the way in which the precision is derived works best if @step
593 * is a power of ten. If the resulting precision is not suitable for your
594 * needs, use gtk_scale_set_digits() to correct it.
596 * Return value: a new #GtkScale
601 gtk_scale_new_with_range (GtkOrientation orientation,
609 g_return_val_if_fail (min < max, NULL);
610 g_return_val_if_fail (step != 0.0, NULL);
612 adj = gtk_adjustment_new (min, min, max, step, 10 * step, 0);
614 if (fabs (step) >= 1.0 || step == 0.0)
620 digits = abs ((gint) floor (log10 (fabs (step))));
625 return g_object_new (GTK_TYPE_SCALE,
626 "orientation", orientation,
633 * gtk_scale_set_digits:
634 * @scale: a #GtkScale
635 * @digits: the number of decimal places to display,
636 * e.g. use 1 to display 1.0, 2 to display 1.00, etc
638 * Sets the number of decimal places that are displayed in the value.
639 * Also causes the value of the adjustment to be rounded off to this
640 * number of digits, so the retrieved value matches the value the user saw.
643 gtk_scale_set_digits (GtkScale *scale,
646 GtkScalePrivate *priv;
649 g_return_if_fail (GTK_IS_SCALE (scale));
652 range = GTK_RANGE (scale);
654 digits = CLAMP (digits, -1, MAX_DIGITS);
656 if (priv->digits != digits)
658 priv->digits = digits;
659 if (priv->draw_value)
660 gtk_range_set_round_digits (range, digits);
662 _gtk_scale_clear_layout (scale);
663 gtk_widget_queue_resize (GTK_WIDGET (scale));
665 g_object_notify (G_OBJECT (scale), "digits");
670 * gtk_scale_get_digits:
671 * @scale: a #GtkScale
673 * Gets the number of decimal places that are displayed in the value.
675 * Returns: the number of decimal places that are displayed
678 gtk_scale_get_digits (GtkScale *scale)
680 g_return_val_if_fail (GTK_IS_SCALE (scale), -1);
682 return scale->priv->digits;
686 * gtk_scale_set_draw_value:
687 * @scale: a #GtkScale
688 * @draw_value: %TRUE to draw the value
690 * Specifies whether the current value is displayed as a string next
694 gtk_scale_set_draw_value (GtkScale *scale,
697 GtkScalePrivate *priv;
699 g_return_if_fail (GTK_IS_SCALE (scale));
703 draw_value = draw_value != FALSE;
705 if (priv->draw_value != draw_value)
707 priv->draw_value = draw_value;
709 gtk_range_set_round_digits (GTK_RANGE (scale), priv->digits);
711 gtk_range_set_round_digits (GTK_RANGE (scale), -1);
713 _gtk_scale_clear_layout (scale);
715 gtk_widget_queue_resize (GTK_WIDGET (scale));
717 g_object_notify (G_OBJECT (scale), "draw-value");
722 * gtk_scale_get_draw_value:
723 * @scale: a #GtkScale
725 * Returns whether the current value is displayed as a string
726 * next to the slider.
728 * Returns: whether the current value is displayed as a string
731 gtk_scale_get_draw_value (GtkScale *scale)
733 g_return_val_if_fail (GTK_IS_SCALE (scale), FALSE);
735 return scale->priv->draw_value;
739 * gtk_scale_set_has_origin:
740 * @scale: a #GtkScale
741 * @has_origin: %TRUE if the scale has an origin
743 * If @has_origin is set to %TRUE (the default),
744 * the scale will highlight the part of the scale
745 * between the origin (bottom or left side) of the scale
746 * and the current value.
751 gtk_scale_set_has_origin (GtkScale *scale,
754 g_return_if_fail (GTK_IS_SCALE (scale));
756 has_origin = has_origin != FALSE;
758 if (_gtk_range_get_has_origin (GTK_RANGE (scale)) != has_origin)
760 _gtk_range_set_has_origin (GTK_RANGE (scale), has_origin);
762 gtk_widget_queue_draw (GTK_WIDGET (scale));
764 g_object_notify (G_OBJECT (scale), "has-origin");
769 * gtk_scale_get_has_origin:
770 * @scale: a #GtkScale
772 * Returns whether the scale has an origin.
774 * Returns: %TRUE if the scale has an origin.
779 gtk_scale_get_has_origin (GtkScale *scale)
781 g_return_val_if_fail (GTK_IS_SCALE (scale), FALSE);
783 return _gtk_range_get_has_origin (GTK_RANGE (scale));
787 * gtk_scale_set_value_pos:
788 * @scale: a #GtkScale
789 * @pos: the position in which the current value is displayed
791 * Sets the position in which the current value is displayed.
794 gtk_scale_set_value_pos (GtkScale *scale,
797 GtkScalePrivate *priv;
800 g_return_if_fail (GTK_IS_SCALE (scale));
804 if (priv->value_pos != pos)
806 priv->value_pos = pos;
807 widget = GTK_WIDGET (scale);
809 _gtk_scale_clear_layout (scale);
810 if (gtk_widget_get_visible (widget) && gtk_widget_get_mapped (widget))
811 gtk_widget_queue_resize (widget);
813 g_object_notify (G_OBJECT (scale), "value-pos");
818 * gtk_scale_get_value_pos:
819 * @scale: a #GtkScale
821 * Gets the position in which the current value is displayed.
823 * Returns: the position in which the current value is displayed
826 gtk_scale_get_value_pos (GtkScale *scale)
828 g_return_val_if_fail (GTK_IS_SCALE (scale), 0);
830 return scale->priv->value_pos;
834 gtk_scale_get_range_border (GtkRange *range,
837 GtkScalePrivate *priv;
842 widget = GTK_WIDGET (range);
843 scale = GTK_SCALE (range);
846 _gtk_scale_get_value_size (scale, &w, &h);
853 if (priv->draw_value)
856 gtk_widget_style_get (widget, "value-spacing", &value_spacing, NULL);
858 switch (priv->value_pos)
861 border->left += w + value_spacing;
864 border->right += w + value_spacing;
867 border->top += h + value_spacing;
870 border->bottom += h + value_spacing;
879 gint n1, w1, h1, n2, w2, h2;
881 gtk_widget_style_get (widget,
882 "slider-width", &slider_width,
883 "value-spacing", &value_spacing,
887 gtk_scale_get_mark_label_size (scale, GTK_POS_TOP, &n1, &w1, &h1, &n2, &w2, &h2);
889 if (gtk_orientable_get_orientation (GTK_ORIENTABLE (scale)) == GTK_ORIENTATION_HORIZONTAL)
892 border->top += h1 + value_spacing + slider_width / 2;
894 border->bottom += h2 + value_spacing + slider_width / 2;
899 border->left += w1 + value_spacing + slider_width / 2;
901 border->right += w2 + value_spacing + slider_width / 2;
906 /* FIXME this could actually be static at the moment. */
908 _gtk_scale_get_value_size (GtkScale *scale,
912 GtkScalePrivate *priv = scale->priv;
915 if (priv->draw_value)
917 GtkAdjustment *adjustment;
919 PangoRectangle logical_rect;
922 range = GTK_RANGE (scale);
924 layout = gtk_widget_create_pango_layout (GTK_WIDGET (scale), NULL);
925 adjustment = gtk_range_get_adjustment (range);
927 txt = _gtk_scale_format_value (scale, gtk_adjustment_get_lower (adjustment));
928 pango_layout_set_text (layout, txt, -1);
931 pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
934 *width = logical_rect.width;
936 *height = logical_rect.height;
938 txt = _gtk_scale_format_value (scale, gtk_adjustment_get_upper (adjustment));
939 pango_layout_set_text (layout, txt, -1);
942 pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
945 *width = MAX (*width, logical_rect.width);
947 *height = MAX (*height, logical_rect.height);
949 g_object_unref (layout);
962 gtk_scale_get_mark_label_size (GtkScale *scale,
963 GtkPositionType position,
971 GtkScalePrivate *priv = scale->priv;
973 PangoRectangle logical_rect;
977 *count1 = *count2 = 0;
978 *width1 = *width2 = 0;
979 *height1 = *height2 = 0;
981 layout = gtk_widget_create_pango_layout (GTK_WIDGET (scale), NULL);
983 for (m = priv->marks; m; m = m->next)
985 GtkScaleMark *mark = m->data;
987 if (mark->markup && *mark->markup)
989 pango_layout_set_markup (layout, mark->markup, -1);
990 pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
992 w = logical_rect.width;
993 h = logical_rect.height;
1001 if (mark->position == position)
1004 *width1 = MAX (*width1, w);
1005 *height1 = MAX (*height1, h);
1010 *width2 = MAX (*width2, w);
1011 *height2 = MAX (*height2, h);
1015 g_object_unref (layout);
1019 gtk_scale_style_updated (GtkWidget *widget)
1024 range = GTK_RANGE (widget);
1026 gtk_widget_style_get (widget,
1027 "slider-length", &slider_length,
1030 gtk_range_set_min_slider_size (range, slider_length);
1032 _gtk_scale_clear_layout (GTK_SCALE (widget));
1034 GTK_WIDGET_CLASS (gtk_scale_parent_class)->style_updated (widget);
1038 gtk_scale_screen_changed (GtkWidget *widget,
1039 GdkScreen *old_screen)
1041 _gtk_scale_clear_layout (GTK_SCALE (widget));
1045 gtk_scale_get_preferred_width (GtkWidget *widget,
1049 GTK_WIDGET_CLASS (gtk_scale_parent_class)->get_preferred_width (widget, minimum, natural);
1051 if (gtk_orientable_get_orientation (GTK_ORIENTABLE (widget)) == GTK_ORIENTATION_HORIZONTAL)
1053 gint n1, w1, h1, n2, w2, h2;
1057 gtk_widget_style_get (widget, "slider-length", &slider_length, NULL);
1059 gtk_scale_get_mark_label_size (GTK_SCALE (widget), GTK_POS_TOP, &n1, &w1, &h1, &n2, &w2, &h2);
1061 w1 = (n1 - 1) * w1 + MAX (w1, slider_length);
1062 w2 = (n2 - 1) * w2 + MAX (w2, slider_length);
1065 *minimum = MAX (*minimum, w);
1066 *natural = MAX (*natural, w);
1071 gtk_scale_get_preferred_height (GtkWidget *widget,
1075 GTK_WIDGET_CLASS (gtk_scale_parent_class)->get_preferred_height (widget, minimum, natural);
1078 if (gtk_orientable_get_orientation (GTK_ORIENTABLE (widget)) == GTK_ORIENTATION_VERTICAL)
1080 gint n1, w1, h1, n2, w2, h2;
1084 gtk_widget_style_get (widget, "slider-length", &slider_length, NULL);
1086 gtk_scale_get_mark_label_size (GTK_SCALE (widget), GTK_POS_TOP, &n1, &w1, &h1, &n2, &w2, &h2);
1087 h1 = (n1 - 1) * h1 + MAX (h1, slider_length);
1088 h2 = (n2 - 1) * h1 + MAX (h2, slider_length);
1091 *minimum = MAX (*minimum, h);
1092 *natural = MAX (*natural, h);
1097 find_next_pos (GtkWidget *widget,
1100 GtkPositionType pos)
1102 GtkAllocation allocation;
1106 for (m = list->next, i = 1; m; m = m->next, i++)
1108 GtkScaleMark *mark = m->data;
1110 if (mark->position == pos)
1114 gtk_widget_get_allocation (widget, &allocation);
1115 if (gtk_orientable_get_orientation (GTK_ORIENTABLE (widget)) == GTK_ORIENTATION_HORIZONTAL)
1116 return allocation.width;
1118 return allocation.height;
1122 gtk_scale_draw (GtkWidget *widget,
1125 GtkScale *scale = GTK_SCALE (widget);
1126 GtkScalePrivate *priv = scale->priv;
1127 GtkRange *range = GTK_RANGE (scale);
1128 GtkStyleContext *context;
1135 context = gtk_widget_get_style_context (widget);
1136 gtk_widget_style_get (widget,
1137 "focus-padding", &focus_padding,
1138 "slider-width", &slider_width,
1139 "value-spacing", &value_spacing,
1142 /* We need to chain up _first_ so the various geometry members of
1143 * GtkRange struct are updated.
1145 GTK_WIDGET_CLASS (gtk_scale_parent_class)->draw (widget, cr);
1149 GtkOrientation orientation;
1150 GdkRectangle range_rect;
1152 gint x1, x2, x3, y1, y2, y3;
1153 PangoLayout *layout;
1154 PangoRectangle logical_rect;
1156 gint min_pos_before, min_pos_after;
1157 gint min_pos, max_pos;
1159 orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (range));
1160 _gtk_range_get_stop_positions (range, &marks);
1162 layout = gtk_widget_create_pango_layout (widget, NULL);
1163 gtk_range_get_range_rect (range, &range_rect);
1165 min_pos_before = min_pos_after = 0;
1167 for (m = priv->marks, i = 0; m; m = m->next, i++)
1169 GtkScaleMark *mark = m->data;
1171 if (orientation == GTK_ORIENTATION_HORIZONTAL)
1174 if (mark->position == GTK_POS_TOP)
1177 y2 = y1 - slider_width / 2;
1178 min_pos = min_pos_before;
1179 max_pos = find_next_pos (widget, m, marks + i, GTK_POS_TOP) - min_sep;
1183 y1 = range_rect.y + range_rect.height;
1184 y2 = y1 + slider_width / 2;
1185 min_pos = min_pos_after;
1186 max_pos = find_next_pos (widget, m, marks + i, GTK_POS_BOTTOM) - min_sep;
1189 gtk_style_context_save (context);
1190 gtk_style_context_add_class (context, GTK_STYLE_CLASS_MARK);
1192 gtk_render_line (context, cr, x1, y1, x1, y2);
1196 pango_layout_set_markup (layout, mark->markup, -1);
1197 pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
1199 x3 = x1 - logical_rect.width / 2;
1202 if (x3 + logical_rect.width > max_pos)
1203 x3 = max_pos - logical_rect.width;
1206 if (mark->position == GTK_POS_TOP)
1208 y3 = y2 - value_spacing - logical_rect.height;
1209 min_pos_before = x3 + logical_rect.width + min_sep;
1213 y3 = y2 + value_spacing;
1214 min_pos_after = x3 + logical_rect.width + min_sep;
1217 gtk_render_layout (context, cr, x3, y3, layout);
1220 gtk_style_context_restore (context);
1224 if (mark->position == GTK_POS_TOP)
1227 x2 = range_rect.x - slider_width / 2;
1228 min_pos = min_pos_before;
1229 max_pos = find_next_pos (widget, m, marks + i, GTK_POS_TOP) - min_sep;
1233 x1 = range_rect.x + range_rect.width;
1234 x2 = range_rect.x + range_rect.width + slider_width / 2;
1235 min_pos = min_pos_after;
1236 max_pos = find_next_pos (widget, m, marks + i, GTK_POS_BOTTOM) - min_sep;
1240 gtk_style_context_save (context);
1241 gtk_style_context_add_class (context, GTK_STYLE_CLASS_MARK);
1243 gtk_render_line (context, cr, x1, y1, x2, y1);
1247 pango_layout_set_markup (layout, mark->markup, -1);
1248 pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
1250 y3 = y1 - logical_rect.height / 2;
1253 if (y3 + logical_rect.height > max_pos)
1254 y3 = max_pos - logical_rect.height;
1257 if (mark->position == GTK_POS_TOP)
1259 x3 = x2 - value_spacing - logical_rect.width;
1260 min_pos_before = y3 + logical_rect.height + min_sep;
1264 x3 = x2 + value_spacing;
1265 min_pos_after = y3 + logical_rect.height + min_sep;
1268 gtk_render_layout (context, cr, x3, y3, layout);
1271 gtk_style_context_restore (context);
1275 g_object_unref (layout);
1279 if (priv->draw_value)
1281 GtkAllocation allocation;
1283 PangoLayout *layout;
1286 layout = gtk_scale_get_layout (scale);
1287 gtk_scale_get_layout_offsets (scale, &x, &y);
1288 gtk_widget_get_allocation (widget, &allocation);
1290 gtk_render_layout (context, cr,
1300 gtk_scale_real_get_layout_offsets (GtkScale *scale,
1304 GtkScalePrivate *priv = scale->priv;
1305 GtkAllocation allocation;
1306 GtkWidget *widget = GTK_WIDGET (scale);
1307 GtkRange *range = GTK_RANGE (widget);
1308 GdkRectangle range_rect;
1309 PangoLayout *layout = gtk_scale_get_layout (scale);
1310 PangoRectangle logical_rect;
1311 gint slider_start, slider_end;
1322 gtk_widget_style_get (widget, "value-spacing", &value_spacing, NULL);
1324 pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
1326 gtk_widget_get_allocation (widget, &allocation);
1327 gtk_range_get_range_rect (range, &range_rect);
1328 gtk_range_get_slider_range (range,
1332 if (gtk_orientable_get_orientation (GTK_ORIENTABLE (range)) == GTK_ORIENTATION_HORIZONTAL)
1334 switch (priv->value_pos)
1337 *x = range_rect.x - value_spacing - logical_rect.width;
1338 *y = range_rect.y + (range_rect.height - logical_rect.height) / 2;
1342 *x = range_rect.x + range_rect.width + value_spacing;
1343 *y = range_rect.y + (range_rect.height - logical_rect.height) / 2;
1347 *x = slider_start + (slider_end - slider_start - logical_rect.width) / 2;
1348 *x = CLAMP (*x, 0, allocation.width - logical_rect.width);
1349 *y = range_rect.y - logical_rect.height - value_spacing;
1352 case GTK_POS_BOTTOM:
1353 *x = slider_start + (slider_end - slider_start - logical_rect.width) / 2;
1354 *x = CLAMP (*x, 0, allocation.width - logical_rect.width);
1355 *y = range_rect.y + range_rect.height + value_spacing;
1359 g_return_if_reached ();
1365 switch (priv->value_pos)
1368 *x = range_rect.x - logical_rect.width - value_spacing;
1369 *y = slider_start + (slider_end - slider_start - logical_rect.height) / 2;
1370 *y = CLAMP (*y, 0, allocation.height - logical_rect.height);
1374 *x = range_rect.x + range_rect.width + value_spacing;
1375 *y = slider_start + (slider_end - slider_start - logical_rect.height) / 2;
1376 *y = CLAMP (*y, 0, allocation.height - logical_rect.height);
1380 *x = range_rect.x + (range_rect.width - logical_rect.width) / 2;
1381 *y = range_rect.y - logical_rect.height - value_spacing;
1384 case GTK_POS_BOTTOM:
1385 *x = range_rect.x + (range_rect.width - logical_rect.width) / 2;
1386 *y = range_rect.y + range_rect.height + value_spacing;
1390 g_return_if_reached ();
1399 * _gtk_scale_format_value:
1400 * @scale: a #GtkScale
1401 * @value: adjustment value
1403 * Emits #GtkScale::format-value signal to format the value,
1404 * if no user signal handlers, falls back to a default format.
1406 * Return value: formatted value
1409 _gtk_scale_format_value (GtkScale *scale,
1412 GtkScalePrivate *priv = scale->priv;
1415 g_signal_emit (scale,
1416 signals[FORMAT_VALUE],
1424 return g_strdup_printf ("%0.*f", priv->digits, value);
1428 gtk_scale_finalize (GObject *object)
1430 GtkScale *scale = GTK_SCALE (object);
1432 _gtk_scale_clear_layout (scale);
1433 gtk_scale_clear_marks (scale);
1435 G_OBJECT_CLASS (gtk_scale_parent_class)->finalize (object);
1439 * gtk_scale_get_layout:
1440 * @scale: A #GtkScale
1442 * Gets the #PangoLayout used to display the scale. The returned
1443 * object is owned by the scale so does not need to be freed by
1446 * Return value: (transfer none): the #PangoLayout for this scale,
1447 * or %NULL if the #GtkScale:draw-value property is %FALSE.
1452 gtk_scale_get_layout (GtkScale *scale)
1454 GtkScalePrivate *priv;
1457 g_return_val_if_fail (GTK_IS_SCALE (scale), NULL);
1463 if (priv->draw_value)
1464 priv->layout = gtk_widget_create_pango_layout (GTK_WIDGET (scale), NULL);
1467 if (priv->draw_value)
1469 txt = _gtk_scale_format_value (scale,
1470 gtk_adjustment_get_value (gtk_range_get_adjustment (GTK_RANGE (scale))));
1471 pango_layout_set_text (priv->layout, txt, -1);
1475 return priv->layout;
1479 * gtk_scale_get_layout_offsets:
1480 * @scale: a #GtkScale
1481 * @x: (out) (allow-none): location to store X offset of layout, or %NULL
1482 * @y: (out) (allow-none): location to store Y offset of layout, or %NULL
1484 * Obtains the coordinates where the scale will draw the
1485 * #PangoLayout representing the text in the scale. Remember
1486 * when using the #PangoLayout function you need to convert to
1487 * and from pixels using PANGO_PIXELS() or #PANGO_SCALE.
1489 * If the #GtkScale:draw-value property is %FALSE, the return
1490 * values are undefined.
1495 gtk_scale_get_layout_offsets (GtkScale *scale,
1502 g_return_if_fail (GTK_IS_SCALE (scale));
1504 if (GTK_SCALE_GET_CLASS (scale)->get_layout_offsets)
1505 (GTK_SCALE_GET_CLASS (scale)->get_layout_offsets) (scale, &local_x, &local_y);
1515 _gtk_scale_clear_layout (GtkScale *scale)
1517 GtkScalePrivate *priv = scale->priv;
1519 g_return_if_fail (GTK_IS_SCALE (scale));
1523 g_object_unref (priv->layout);
1524 priv->layout = NULL;
1529 gtk_scale_mark_free (gpointer data)
1531 GtkScaleMark *mark = data;
1533 g_free (mark->markup);
1538 * gtk_scale_clear_marks:
1539 * @scale: a #GtkScale
1541 * Removes any marks that have been added with gtk_scale_add_mark().
1546 gtk_scale_clear_marks (GtkScale *scale)
1548 GtkScalePrivate *priv;
1549 GtkStyleContext *context;
1551 g_return_if_fail (GTK_IS_SCALE (scale));
1555 g_slist_free_full (priv->marks, gtk_scale_mark_free);
1558 context = gtk_widget_get_style_context (GTK_WIDGET (scale));
1559 gtk_style_context_remove_class (context, GTK_STYLE_CLASS_SCALE_HAS_MARKS_BELOW);
1560 gtk_style_context_remove_class (context, GTK_STYLE_CLASS_SCALE_HAS_MARKS_ABOVE);
1562 _gtk_range_set_stop_values (GTK_RANGE (scale), NULL, 0);
1564 gtk_widget_queue_resize (GTK_WIDGET (scale));
1568 * gtk_scale_add_mark:
1569 * @scale: a #GtkScale
1570 * @value: the value at which the mark is placed, must be between
1571 * the lower and upper limits of the scales' adjustment
1572 * @position: where to draw the mark. For a horizontal scale, #GTK_POS_TOP
1573 * and %GTK_POS_LEFT are drawn above the scale, anything else below.
1574 * For a vertical scale, #GTK_POS_LEFT and %GTK_POS_TOP are drawn to
1575 * the left of the scale, anything else to the right.
1576 * @markup: (allow-none): Text to be shown at the mark, using <link linkend="PangoMarkupFormat">Pango markup</link>, or %NULL
1579 * Adds a mark at @value.
1581 * A mark is indicated visually by drawing a tick mark next to the scale,
1582 * and GTK+ makes it easy for the user to position the scale exactly at the
1585 * If @markup is not %NULL, text is shown next to the tick mark.
1587 * To remove marks from a scale, use gtk_scale_clear_marks().
1592 gtk_scale_add_mark (GtkScale *scale,
1594 GtkPositionType position,
1595 const gchar *markup)
1597 GtkScalePrivate *priv;
1602 GtkStyleContext *context;
1605 g_return_if_fail (GTK_IS_SCALE (scale));
1609 mark = g_new (GtkScaleMark, 1);
1610 mark->value = value;
1611 mark->markup = g_strdup (markup);
1612 if (position == GTK_POS_LEFT ||
1613 position == GTK_POS_TOP)
1614 mark->position = GTK_POS_TOP;
1616 mark->position = GTK_POS_BOTTOM;
1618 priv->marks = g_slist_insert_sorted_with_data (priv->marks, mark,
1620 GINT_TO_POINTER (gtk_range_get_inverted (GTK_RANGE (scale))));
1622 #define MARKS_ABOVE 1
1623 #define MARKS_BELOW 2
1626 n = g_slist_length (priv->marks);
1627 values = g_new (gdouble, n);
1628 for (m = priv->marks, i = 0; m; m = m->next, i++)
1631 values[i] = mark->value;
1632 if (mark->position == GTK_POS_TOP)
1633 all_pos |= MARKS_ABOVE;
1635 all_pos |= MARKS_BELOW;
1638 _gtk_range_set_stop_values (GTK_RANGE (scale), values, n);
1642 /* Set the style classes for the slider, so it could
1643 * point to the right direction when marks are present
1645 context = gtk_widget_get_style_context (GTK_WIDGET (scale));
1647 if (all_pos & MARKS_ABOVE)
1648 gtk_style_context_add_class (context, GTK_STYLE_CLASS_SCALE_HAS_MARKS_ABOVE);
1650 gtk_style_context_remove_class (context, GTK_STYLE_CLASS_SCALE_HAS_MARKS_ABOVE);
1651 if (all_pos & MARKS_BELOW)
1652 gtk_style_context_add_class (context, GTK_STYLE_CLASS_SCALE_HAS_MARKS_BELOW);
1654 gtk_style_context_remove_class (context, GTK_STYLE_CLASS_SCALE_HAS_MARKS_BELOW);
1656 gtk_widget_queue_resize (GTK_WIDGET (scale));
1659 static GtkBuildableIface *parent_buildable_iface;
1662 gtk_scale_buildable_interface_init (GtkBuildableIface *iface)
1664 parent_buildable_iface = g_type_interface_peek_parent (iface);
1665 iface->custom_tag_start = gtk_scale_buildable_custom_tag_start;
1666 iface->custom_finished = gtk_scale_buildable_custom_finished;
1672 GtkBuilder *builder;
1674 } MarksSubparserData;
1679 GtkPositionType position;
1682 gboolean translatable;
1686 mark_data_free (MarkData *data)
1688 g_string_free (data->markup, TRUE);
1689 g_free (data->context);
1690 g_slice_free (MarkData, data);
1694 marks_start_element (GMarkupParseContext *context,
1695 const gchar *element_name,
1696 const gchar **names,
1697 const gchar **values,
1701 MarksSubparserData *parser_data = (MarksSubparserData*)user_data;
1703 gint line_number, char_number;
1705 if (strcmp (element_name, "marks") == 0)
1707 else if (strcmp (element_name, "mark") == 0)
1710 gboolean has_value = FALSE;
1711 GtkPositionType position = GTK_POS_BOTTOM;
1712 const gchar *msg_context = NULL;
1713 gboolean translatable = FALSE;
1716 for (i = 0; names[i]; i++)
1718 if (strcmp (names[i], "translatable") == 0)
1720 if (!_gtk_builder_boolean_from_string (values[i], &translatable, error))
1723 else if (strcmp (names[i], "comments") == 0)
1725 /* do nothing, comments are for translators */
1727 else if (strcmp (names[i], "context") == 0)
1728 msg_context = values[i];
1729 else if (strcmp (names[i], "value") == 0)
1731 GValue gvalue = G_VALUE_INIT;
1733 if (!gtk_builder_value_from_string_type (parser_data->builder, G_TYPE_DOUBLE, values[i], &gvalue, error))
1736 value = g_value_get_double (&gvalue);
1739 else if (strcmp (names[i], "position") == 0)
1741 GValue gvalue = G_VALUE_INIT;
1743 if (!gtk_builder_value_from_string_type (parser_data->builder, GTK_TYPE_POSITION_TYPE, values[i], &gvalue, error))
1746 position = g_value_get_enum (&gvalue);
1750 g_markup_parse_context_get_position (context,
1755 GTK_BUILDER_ERROR_INVALID_ATTRIBUTE,
1756 "%s:%d:%d '%s' is not a valid attribute of <%s>",
1758 line_number, char_number, names[i], "mark");
1765 g_markup_parse_context_get_position (context,
1770 GTK_BUILDER_ERROR_MISSING_ATTRIBUTE,
1771 "%s:%d:%d <%s> requires attribute \"%s\"",
1773 line_number, char_number, "mark",
1778 mark = g_slice_new (MarkData);
1779 mark->value = value;
1780 if (position == GTK_POS_LEFT ||
1781 position == GTK_POS_TOP)
1782 mark->position = GTK_POS_TOP;
1784 mark->position = GTK_POS_BOTTOM;
1785 mark->markup = g_string_new ("");
1786 mark->context = g_strdup (msg_context);
1787 mark->translatable = translatable;
1789 parser_data->marks = g_slist_prepend (parser_data->marks, mark);
1793 g_markup_parse_context_get_position (context,
1798 GTK_BUILDER_ERROR_MISSING_ATTRIBUTE,
1799 "%s:%d:%d unsupported tag for GtkScale: \"%s\"",
1801 line_number, char_number, element_name);
1807 marks_text (GMarkupParseContext *context,
1813 MarksSubparserData *data = (MarksSubparserData*)user_data;
1815 if (strcmp (g_markup_parse_context_get_element (context), "mark") == 0)
1817 MarkData *mark = data->marks->data;
1819 g_string_append_len (mark->markup, text, text_len);
1823 static const GMarkupParser marks_parser =
1825 marks_start_element,
1832 gtk_scale_buildable_custom_tag_start (GtkBuildable *buildable,
1833 GtkBuilder *builder,
1835 const gchar *tagname,
1836 GMarkupParser *parser,
1839 MarksSubparserData *parser_data;
1844 if (strcmp (tagname, "marks") == 0)
1846 parser_data = g_slice_new0 (MarksSubparserData);
1847 parser_data->scale = GTK_SCALE (buildable);
1848 parser_data->marks = NULL;
1850 *parser = marks_parser;
1851 *data = parser_data;
1855 return parent_buildable_iface->custom_tag_start (buildable, builder, child,
1856 tagname, parser, data);
1860 gtk_scale_buildable_custom_finished (GtkBuildable *buildable,
1861 GtkBuilder *builder,
1863 const gchar *tagname,
1866 GtkScale *scale = GTK_SCALE (buildable);
1867 MarksSubparserData *marks_data;
1869 if (strcmp (tagname, "marks") == 0)
1874 marks_data = (MarksSubparserData *)user_data;
1876 for (m = marks_data->marks; m; m = m->next)
1878 MarkData *mdata = m->data;
1880 if (mdata->translatable && mdata->markup->len)
1881 markup = _gtk_builder_parser_translate (gtk_builder_get_translation_domain (builder),
1883 mdata->markup->str);
1885 markup = mdata->markup->str;
1887 gtk_scale_add_mark (scale, mdata->value, mdata->position, markup);
1889 mark_data_free (mdata);
1892 g_slist_free (marks_data->marks);
1893 g_slice_free (MarksSubparserData, marks_data);