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gtk2/gtk/gtkscale.c
Matthias Clasen 8ca612c966 scale: Make draw-value default to FALSE 
This is rarely what you want, so lets turn it off
by default.

Update the one place in our demos where we want to
draw a value, add support for this to gtk-builder-tool,
add a test and mention this change in the migration
guide.
2020-10-04 08:26:44 -04:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
* 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, see <http://www.gnu.org/licenses/>.
*/
/*
* 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 "config.h"
#include "gtkscale.h"
#include "gtkadjustment.h"
#include "gtkbuildable.h"
#include "gtkbuilderprivate.h"
#include "gtkgizmoprivate.h"
#include "gtkicontheme.h"
#include "gtkintl.h"
#include "gtklabel.h"
#include "gtkmarshalers.h"
#include "gtkorientable.h"
#include "gtkprivate.h"
#include "gtkrangeprivate.h"
#include "gtkstylecontextprivate.h"
#include "gtkstylepropertyprivate.h"
#include "gtktypebuiltins.h"
#include "gtkwidgetprivate.h"
#include <math.h>
#include <stdlib.h>
/**
* SECTION:gtkscale
* @Short_description: A slider widget for selecting a value from a range
* @Title: GtkScale
*
* A GtkScale is a slider control used to select a numeric value.
* To use it, you’ll probably want to investigate the methods on
* its base class, #GtkRange, in addition to the methods for GtkScale itself.
* To set the value of a scale, you would normally use gtk_range_set_value().
* To detect changes to the value, you would normally use the
* #GtkRange::value-changed signal.
*
* Note that using the same upper and lower bounds for the #GtkScale (through
* the #GtkRange methods) will hide the slider itself. This is useful for
* applications that want to show an undeterminate value on the scale, without
* changing the layout of the application (such as movie or music players).
*
* # GtkScale as GtkBuildable
*
* GtkScale supports a custom <marks> element, which can contain multiple
* <mark> elements. The “value” and “position” attributes have the same
* meaning as gtk_scale_add_mark() parameters of the same name. If the
* element is not empty, its content is taken as the markup to show at
* the mark. It can be translated with the usual ”translatable” and
* “context” attributes.
*
* # CSS nodes
*
* |[<!-- language="plain" -->
* scale[.fine-tune][.marks-before][.marks-after]
* ├── [value][.top][.right][.bottom][.left]
* ├── marks.top
* │ ├── mark
* │ ┊ ├── [label]
* │ ┊ ╰── indicator
* ┊ ┊
* │ ╰── mark
* ├── marks.bottom
* │ ├── mark
* │ ┊ ├── indicator
* │ ┊ ╰── [label]
* ┊ ┊
* │ ╰── mark
* ╰── trough
* ├── [fill]
* ├── [highlight]
* ╰── slider
* ]|
*
* GtkScale has a main CSS node with name scale and a subnode for its contents,
* with subnodes named trough and slider.
*
* The main node gets the style class .fine-tune added when the scale is in
* 'fine-tuning' mode.
*
* If the scale has an origin (see gtk_scale_set_has_origin()), there is a
* subnode with name highlight below the trough node that is used for rendering
* the highlighted part of the trough.
*
* If the scale is showing a fill level (see gtk_range_set_show_fill_level()),
* there is a subnode with name fill below the trough node that is used for
* rendering the filled in part of the trough.
*
* If marks are present, there is a marks subnode before or after the trough
* node, below which each mark gets a node with name mark. The marks nodes get
* either the .top or .bottom style class.
*
* The mark node has a subnode named indicator. If the mark has text, it also
* has a subnode named label. When the mark is either above or left of the
* scale, the label subnode is the first when present. Otherwise, the indicator
* subnode is the first.
*
* The main CSS node gets the 'marks-before' and/or 'marks-after' style classes
* added depending on what marks are present.
*
* If the scale is displaying the value (see #GtkScale:draw-value), there is
* subnode with name value. This node will get the .top or .bottom style classes
* similar to the marks node.
*
* # Accessibility
*
* GtkScale uses the #GTK_ACCESSIBLE_ROLE_SLIDER role.
*/
#define MAX_DIGITS (64) /* don't change this,
* a) you don't need to and
* b) you might cause buffer owerflows in
* unrelated code portions otherwise
*/
typedef struct _GtkScaleMark GtkScaleMark;
typedef struct _GtkScalePrivate GtkScalePrivate;
struct _GtkScalePrivate
{
GSList *marks;
GtkWidget *value_widget;
GtkWidget *top_marks_widget;
GtkWidget *bottom_marks_widget;
int digits;
guint draw_value : 1;
guint value_pos : 2;
GtkScaleFormatValueFunc format_value_func;
gpointer format_value_func_user_data;
GDestroyNotify format_value_func_destroy_notify;
};
struct _GtkScaleMark
{
double value;
int stop_position;
GtkPositionType position; /* always GTK_POS_TOP or GTK_POS_BOTTOM */
char *markup;
GtkWidget *label_widget;
GtkWidget *indicator_widget;
GtkWidget *widget;
};
enum {
PROP_0,
PROP_DIGITS,
PROP_DRAW_VALUE,
PROP_HAS_ORIGIN,
PROP_VALUE_POS,
LAST_PROP
};
static GParamSpec *properties[LAST_PROP];
static void gtk_scale_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_scale_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gtk_scale_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline);
static void gtk_scale_get_range_border (GtkRange *range,
GtkBorder *border);
static void gtk_scale_finalize (GObject *object);
static void gtk_scale_real_get_layout_offsets (GtkScale *scale,
int *x,
int *y);
static void gtk_scale_buildable_interface_init (GtkBuildableIface *iface);
static gboolean gtk_scale_buildable_custom_tag_start (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const char *tagname,
GtkBuildableParser *parser,
gpointer *data);
static void gtk_scale_buildable_custom_finished (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const char *tagname,
gpointer user_data);
static char * gtk_scale_format_value (GtkScale *scale,
double value);
G_DEFINE_TYPE_WITH_CODE (GtkScale, gtk_scale, GTK_TYPE_RANGE,
G_ADD_PRIVATE (GtkScale)
G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
gtk_scale_buildable_interface_init))
static int
compare_marks (gconstpointer a, gconstpointer b, gpointer data)
{
gboolean inverted = GPOINTER_TO_INT (data);
int val;
const GtkScaleMark *ma, *mb;
val = inverted ? -1 : 1;
ma = a; mb = b;
return (ma->value > mb->value) ? val : ((ma->value < mb->value) ? -val : 0);
}
static void
update_label_request (GtkScale *scale)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
GtkAdjustment *adjustment = gtk_range_get_adjustment (GTK_RANGE (scale));
double lowest_value, highest_value;
char *old_text;
char *text;
int size = 0;
int min;
g_assert (priv->value_widget != NULL);
lowest_value = gtk_adjustment_get_lower (adjustment);
highest_value = gtk_adjustment_get_upper (adjustment);
old_text = g_strdup (gtk_label_get_label (GTK_LABEL (priv->value_widget)));
gtk_widget_set_size_request (priv->value_widget, -1, -1);
text = gtk_scale_format_value (scale, lowest_value);
gtk_label_set_label (GTK_LABEL (priv->value_widget), text);
gtk_widget_measure (priv->value_widget, GTK_ORIENTATION_HORIZONTAL, -1,
&min, NULL, NULL, NULL);
size = MAX (size, min);
g_free (text);
text = gtk_scale_format_value (scale, highest_value);
gtk_label_set_label (GTK_LABEL (priv->value_widget), text);
gtk_widget_measure (priv->value_widget, GTK_ORIENTATION_HORIZONTAL, -1,
&min, NULL, NULL, NULL);
size = MAX (size, min);
g_free (text);
gtk_widget_set_size_request (priv->value_widget, size, -1);
gtk_label_set_label (GTK_LABEL (priv->value_widget), old_text);
g_free (old_text);
}
static void
gtk_scale_notify (GObject *object,
GParamSpec *pspec)
{
GtkScale *scale = GTK_SCALE (object);
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
if (strcmp (pspec->name, "inverted") == 0)
{
GtkScaleMark *mark;
GSList *m;
int i, n;
double *values;
priv->marks = g_slist_sort_with_data (priv->marks,
compare_marks,
GINT_TO_POINTER (gtk_range_get_inverted (GTK_RANGE (scale))));
n = g_slist_length (priv->marks);
values = g_new (double, n);
for (m = priv->marks, i = 0; m; m = m->next, i++)
{
mark = m->data;
values[i] = mark->value;
}
_gtk_range_set_stop_values (GTK_RANGE (scale), values, n);
if (priv->top_marks_widget)
gtk_widget_queue_resize (priv->top_marks_widget);
if (priv->bottom_marks_widget)
gtk_widget_queue_resize (priv->bottom_marks_widget);
g_free (values);
}
else if (strcmp (pspec->name, "adjustment"))
{
if (priv->value_widget)
update_label_request (scale);
}
if (G_OBJECT_CLASS (gtk_scale_parent_class)->notify)
G_OBJECT_CLASS (gtk_scale_parent_class)->notify (object, pspec);
}
static void
gtk_scale_allocate_value (GtkScale *scale)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
GtkWidget *widget = GTK_WIDGET (scale);
GtkRange *range = GTK_RANGE (widget);
GtkWidget *slider_widget;
GtkAllocation value_alloc;
int range_width, range_height;
graphene_rect_t slider_bounds;
range_width = gtk_widget_get_width (widget);
range_height = gtk_widget_get_height (widget);
slider_widget = gtk_range_get_slider_widget (range);
if (!gtk_widget_compute_bounds (slider_widget, widget, &slider_bounds))
graphene_rect_init (&slider_bounds, 0, 0, gtk_widget_get_width (widget), gtk_widget_get_height (widget));
gtk_widget_measure (priv->value_widget,
GTK_ORIENTATION_HORIZONTAL, -1,
&value_alloc.width, NULL,
NULL, NULL);
gtk_widget_measure (priv->value_widget,
GTK_ORIENTATION_VERTICAL, -1,
&value_alloc.height, NULL,
NULL, NULL);
if (gtk_orientable_get_orientation (GTK_ORIENTABLE (range)) == GTK_ORIENTATION_HORIZONTAL)
{
switch (priv->value_pos)
{
case GTK_POS_LEFT:
value_alloc.x = 0;
value_alloc.y = (range_height - value_alloc.height) / 2;
break;
case GTK_POS_RIGHT:
value_alloc.x = range_width - value_alloc.width;
value_alloc.y = (range_height - value_alloc.height) / 2;
break;
case GTK_POS_TOP:
value_alloc.x = slider_bounds.origin.x + (slider_bounds.size.width - value_alloc.width) / 2;
value_alloc.y = slider_bounds.origin.y - value_alloc.height;
break;
case GTK_POS_BOTTOM:
value_alloc.x = slider_bounds.origin.x + (slider_bounds.size.width - value_alloc.width) / 2;
value_alloc.y = range_height - value_alloc.height;
break;
default:
g_return_if_reached ();
break;
}
}
else /* VERTICAL */
{
switch (priv->value_pos)
{
case GTK_POS_LEFT:
value_alloc.x = 0;
value_alloc.y = (slider_bounds.origin.y + (slider_bounds.size.height / 2)) - value_alloc.height / 2;
break;
case GTK_POS_RIGHT:
value_alloc.x = range_width - value_alloc.width;
value_alloc.y = (slider_bounds.origin.y + (slider_bounds.size.height / 2)) - value_alloc.height / 2;
break;
case GTK_POS_TOP:
value_alloc.x = (range_width - value_alloc.width) / 2;
value_alloc.y = 0;
break;
case GTK_POS_BOTTOM:
value_alloc.x = (range_width - value_alloc.width) / 2;
value_alloc.y = range_height - value_alloc.height;
break;
default:
g_return_if_reached ();
}
}
gtk_widget_size_allocate (priv->value_widget, &value_alloc, -1);
}
static void
gtk_scale_allocate_mark (GtkGizmo *gizmo,
int width,
int height,
int baseline)
{
GtkWidget *widget = GTK_WIDGET (gizmo);
GtkScale *scale = GTK_SCALE (gtk_widget_get_parent (gtk_widget_get_parent (widget)));
GtkScaleMark *mark = g_object_get_data (G_OBJECT (gizmo), "mark");
int indicator_width, indicator_height;
GtkAllocation indicator_alloc;
GtkOrientation orientation;
orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (scale));
gtk_widget_measure (mark->indicator_widget,
GTK_ORIENTATION_HORIZONTAL, -1,
&indicator_width, NULL,
NULL, NULL);
gtk_widget_measure (mark->indicator_widget,
GTK_ORIENTATION_VERTICAL, -1,
&indicator_height, NULL,
NULL, NULL);
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
indicator_alloc.x = (width - indicator_width) / 2;
if (mark->position == GTK_POS_TOP)
indicator_alloc.y = height - indicator_height;
else
indicator_alloc.y = 0;
indicator_alloc.width = indicator_width;
indicator_alloc.height = indicator_height;
}
else
{
if (mark->position == GTK_POS_TOP)
indicator_alloc.x = width - indicator_width;
else
indicator_alloc.x = 0;
indicator_alloc.y = (height - indicator_height) / 2;
indicator_alloc.width = indicator_width;
indicator_alloc.height = indicator_height;
}
gtk_widget_size_allocate (mark->indicator_widget, &indicator_alloc, baseline);
if (mark->label_widget)
{
GtkAllocation label_alloc;
label_alloc = (GtkAllocation) {0, 0, width, height};
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
label_alloc.height = height - indicator_alloc.height;
if (mark->position == GTK_POS_BOTTOM)
label_alloc.y = indicator_alloc.y + indicator_alloc.height;
}
else
{
label_alloc.width = width - indicator_alloc.width;
if (mark->position == GTK_POS_BOTTOM)
label_alloc.x = indicator_alloc.x + indicator_alloc.width;
}
gtk_widget_size_allocate (mark->label_widget, &label_alloc, baseline);
}
}
static void
gtk_scale_allocate_marks (GtkGizmo *gizmo,
int width,
int height,
int baseline)
{
GtkWidget *widget = GTK_WIDGET (gizmo);
GtkScale *scale = GTK_SCALE (gtk_widget_get_parent (widget));
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
GtkOrientation orientation;
int *marks;
int i;
GSList *m;
orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (scale));
_gtk_range_get_stop_positions (GTK_RANGE (scale), &marks);
for (m = priv->marks, i = 0; m; m = m->next, i++)
{
GtkScaleMark *mark = m->data;
GtkAllocation mark_alloc;
int mark_size;
if ((mark->position == GTK_POS_TOP && widget == priv->bottom_marks_widget) ||
(mark->position == GTK_POS_BOTTOM && widget == priv->top_marks_widget))
continue;
gtk_widget_measure (mark->widget,
orientation, -1,
&mark_size, NULL,
NULL, NULL);
mark->stop_position = marks[i];
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
mark_alloc.x = mark->stop_position;
mark_alloc.y = 0;
mark_alloc.width = mark_size;
mark_alloc.height = height;
mark_alloc.x -= mark_size / 2;
}
else
{
mark_alloc.x = 0;
mark_alloc.y = mark->stop_position;
mark_alloc.width = width;
mark_alloc.height = mark_size;
mark_alloc.y -= mark_size / 2;
}
gtk_widget_size_allocate (mark->widget, &mark_alloc, baseline);
}
g_free (marks);
}
static void
gtk_scale_size_allocate (GtkWidget *widget,
int width,
int height,
int baseline)
{
GtkScale *scale = GTK_SCALE (widget);
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
GtkAllocation range_rect, marks_rect;
GtkOrientation orientation;
GTK_WIDGET_CLASS (gtk_scale_parent_class)->size_allocate (widget, width, height, baseline);
orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (widget));
gtk_range_get_range_rect (GTK_RANGE (scale), &range_rect);
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
int marks_height = 0;
if (priv->top_marks_widget)
{
gtk_widget_measure (priv->top_marks_widget,
GTK_ORIENTATION_VERTICAL, -1,
&marks_height, NULL,
NULL, NULL);
marks_rect.x = 0;
marks_rect.y = 0;
marks_rect.width = range_rect.width;
marks_rect.height = marks_height;
gtk_widget_size_allocate (priv->top_marks_widget, &marks_rect, -1);
}
if (priv->bottom_marks_widget)
{
gtk_widget_measure (priv->bottom_marks_widget,
GTK_ORIENTATION_VERTICAL, -1,
&marks_height, NULL,
NULL, NULL);
marks_rect.x = 0;
marks_rect.y = range_rect.y + range_rect.height;
marks_rect.width = range_rect.width;
marks_rect.height = marks_height;
gtk_widget_size_allocate (priv->bottom_marks_widget, &marks_rect, -1);
}
}
else
{
int marks_width = 0;
if (priv->top_marks_widget)
{
gtk_widget_measure (priv->top_marks_widget,
GTK_ORIENTATION_HORIZONTAL, -1,
&marks_width, NULL,
NULL, NULL);
marks_rect.x = range_rect.x - marks_width;
marks_rect.y = 0;
marks_rect.width = marks_width;
marks_rect.height = range_rect.height;
gtk_widget_size_allocate (priv->top_marks_widget, &marks_rect, -1);
}
if (priv->bottom_marks_widget)
{
gtk_widget_measure (priv->bottom_marks_widget,
GTK_ORIENTATION_HORIZONTAL, -1,
&marks_width, NULL,
NULL, NULL);
marks_rect = range_rect;
marks_rect.x = range_rect.x + range_rect.width;
marks_rect.y = 0;
marks_rect.width = marks_width;
marks_rect.height = range_rect.height;
gtk_widget_size_allocate (priv->bottom_marks_widget, &marks_rect, -1);
}
}
if (priv->value_widget)
{
gtk_scale_allocate_value (scale);
}
}
#define add_slider_binding(binding_set, keyval, mask, scroll) \
gtk_widget_class_add_binding_signal (widget_class, \
keyval, mask, \
I_("move-slider"), \
"(i)", scroll)
static void
gtk_scale_value_changed (GtkRange *range)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (GTK_SCALE (range));
GtkAdjustment *adjustment = gtk_range_get_adjustment (range);
if (priv->value_widget)
{
char *text = gtk_scale_format_value (GTK_SCALE (range),
gtk_adjustment_get_value (adjustment));
gtk_label_set_label (GTK_LABEL (priv->value_widget), text);
g_free (text);
}
}
static void
gtk_scale_class_init (GtkScaleClass *class)
{
GObjectClass *gobject_class;
GtkWidgetClass *widget_class;
GtkRangeClass *range_class;
gobject_class = G_OBJECT_CLASS (class);
range_class = (GtkRangeClass*) class;
widget_class = (GtkWidgetClass*) class;
gobject_class->set_property = gtk_scale_set_property;
gobject_class->get_property = gtk_scale_get_property;
gobject_class->notify = gtk_scale_notify;
gobject_class->finalize = gtk_scale_finalize;
widget_class->size_allocate = gtk_scale_size_allocate;
widget_class->measure = gtk_scale_measure;
widget_class->grab_focus = gtk_widget_grab_focus_self;
widget_class->focus = gtk_widget_focus_self;
range_class->get_range_border = gtk_scale_get_range_border;
range_class->value_changed = gtk_scale_value_changed;
class->get_layout_offsets = gtk_scale_real_get_layout_offsets;
properties[PROP_DIGITS] =
g_param_spec_int ("digits",
P_("Digits"),
P_("The number of decimal places that are displayed in the value"),
-1, MAX_DIGITS,
1,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
properties[PROP_DRAW_VALUE] =
g_param_spec_boolean ("draw-value",
P_("Draw Value"),
P_("Whether the current value is displayed as a string next to the slider"),
FALSE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
properties[PROP_HAS_ORIGIN] =
g_param_spec_boolean ("has-origin",
P_("Has Origin"),
P_("Whether the scale has an origin"),
TRUE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
properties[PROP_VALUE_POS] =
g_param_spec_enum ("value-pos",
P_("Value Position"),
P_("The position in which the current value is displayed"),
GTK_TYPE_POSITION_TYPE,
GTK_POS_TOP,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
g_object_class_install_properties (gobject_class, LAST_PROP, properties);
/* All bindings (even arrow keys) are on both h/v scale, because
* blind users etc. don't care about scale orientation.
*/
add_slider_binding (binding_set, GDK_KEY_Left, 0,
GTK_SCROLL_STEP_LEFT);
add_slider_binding (binding_set, GDK_KEY_Left, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_LEFT);
add_slider_binding (binding_set, GDK_KEY_KP_Left, 0,
GTK_SCROLL_STEP_LEFT);
add_slider_binding (binding_set, GDK_KEY_KP_Left, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_LEFT);
add_slider_binding (binding_set, GDK_KEY_Right, 0,
GTK_SCROLL_STEP_RIGHT);
add_slider_binding (binding_set, GDK_KEY_Right, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_RIGHT);
add_slider_binding (binding_set, GDK_KEY_KP_Right, 0,
GTK_SCROLL_STEP_RIGHT);
add_slider_binding (binding_set, GDK_KEY_KP_Right, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_RIGHT);
add_slider_binding (binding_set, GDK_KEY_Up, 0,
GTK_SCROLL_STEP_UP);
add_slider_binding (binding_set, GDK_KEY_Up, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_UP);
add_slider_binding (binding_set, GDK_KEY_KP_Up, 0,
GTK_SCROLL_STEP_UP);
add_slider_binding (binding_set, GDK_KEY_KP_Up, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_UP);
add_slider_binding (binding_set, GDK_KEY_Down, 0,
GTK_SCROLL_STEP_DOWN);
add_slider_binding (binding_set, GDK_KEY_Down, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_DOWN);
add_slider_binding (binding_set, GDK_KEY_KP_Down, 0,
GTK_SCROLL_STEP_DOWN);
add_slider_binding (binding_set, GDK_KEY_KP_Down, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_DOWN);
add_slider_binding (binding_set, GDK_KEY_Page_Up, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_LEFT);
add_slider_binding (binding_set, GDK_KEY_KP_Page_Up, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_LEFT);
add_slider_binding (binding_set, GDK_KEY_Page_Up, 0,
GTK_SCROLL_PAGE_UP);
add_slider_binding (binding_set, GDK_KEY_KP_Page_Up, 0,
GTK_SCROLL_PAGE_UP);
add_slider_binding (binding_set, GDK_KEY_Page_Down, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_RIGHT);
add_slider_binding (binding_set, GDK_KEY_KP_Page_Down, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_RIGHT);
add_slider_binding (binding_set, GDK_KEY_Page_Down, 0,
GTK_SCROLL_PAGE_DOWN);
add_slider_binding (binding_set, GDK_KEY_KP_Page_Down, 0,
GTK_SCROLL_PAGE_DOWN);
/* Logical bindings (vs. visual bindings above) */
add_slider_binding (binding_set, GDK_KEY_plus, 0,
GTK_SCROLL_STEP_FORWARD);
add_slider_binding (binding_set, GDK_KEY_minus, 0,
GTK_SCROLL_STEP_BACKWARD);
add_slider_binding (binding_set, GDK_KEY_plus, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_FORWARD);
add_slider_binding (binding_set, GDK_KEY_minus, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_BACKWARD);
add_slider_binding (binding_set, GDK_KEY_KP_Add, 0,
GTK_SCROLL_STEP_FORWARD);
add_slider_binding (binding_set, GDK_KEY_KP_Subtract, 0,
GTK_SCROLL_STEP_BACKWARD);
add_slider_binding (binding_set, GDK_KEY_KP_Add, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_FORWARD);
add_slider_binding (binding_set, GDK_KEY_KP_Subtract, GDK_CONTROL_MASK,
GTK_SCROLL_PAGE_BACKWARD);
add_slider_binding (binding_set, GDK_KEY_Home, 0,
GTK_SCROLL_START);
add_slider_binding (binding_set, GDK_KEY_KP_Home, 0,
GTK_SCROLL_START);
add_slider_binding (binding_set, GDK_KEY_End, 0,
GTK_SCROLL_END);
add_slider_binding (binding_set, GDK_KEY_KP_End, 0,
GTK_SCROLL_END);
gtk_widget_class_set_css_name (widget_class, I_("scale"));
gtk_widget_class_set_accessible_role (widget_class, GTK_ACCESSIBLE_ROLE_SLIDER);
}
static void
gtk_scale_init (GtkScale *scale)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
GtkRange *range = GTK_RANGE (scale);
gtk_widget_set_focusable (GTK_WIDGET (scale), TRUE);
priv->value_pos = GTK_POS_TOP;
priv->digits = 1;
gtk_range_set_slider_size_fixed (range, TRUE);
_gtk_range_set_has_origin (range, TRUE);
gtk_range_set_round_digits (range, priv->digits);
gtk_range_set_flippable (range, TRUE);
}
static void
gtk_scale_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkScale *scale;
scale = GTK_SCALE (object);
switch (prop_id)
{
case PROP_DIGITS:
gtk_scale_set_digits (scale, g_value_get_int (value));
break;
case PROP_DRAW_VALUE:
gtk_scale_set_draw_value (scale, g_value_get_boolean (value));
break;
case PROP_HAS_ORIGIN:
gtk_scale_set_has_origin (scale, g_value_get_boolean (value));
break;
case PROP_VALUE_POS:
gtk_scale_set_value_pos (scale, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_scale_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkScale *scale = GTK_SCALE (object);
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
switch (prop_id)
{
case PROP_DIGITS:
g_value_set_int (value, priv->digits);
break;
case PROP_DRAW_VALUE:
g_value_set_boolean (value, priv->draw_value);
break;
case PROP_HAS_ORIGIN:
g_value_set_boolean (value, gtk_scale_get_has_origin (scale));
break;
case PROP_VALUE_POS:
g_value_set_enum (value, priv->value_pos);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gtk_scale_new:
* @orientation: the scale’s orientation.
* @adjustment: (nullable): the #GtkAdjustment which sets the range
* of the scale, or %NULL to create a new adjustment.
*
* Creates a new #GtkScale.
*
* Returns: a new #GtkScale
**/
GtkWidget *
gtk_scale_new (GtkOrientation orientation,
GtkAdjustment *adjustment)
{
g_return_val_if_fail (adjustment == NULL || GTK_IS_ADJUSTMENT (adjustment),
NULL);
return g_object_new (GTK_TYPE_SCALE,
"orientation", orientation,
"adjustment", adjustment,
NULL);
}
/**
* gtk_scale_new_with_range:
* @orientation: the scale’s orientation.
* @min: minimum value
* @max: maximum value
* @step: step increment (tick size) used with keyboard shortcuts
*
* Creates a new scale widget with the given orientation 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.
*
* Note that the way in which the precision is derived works best if @step
* is a power of ten. If the resulting precision is not suitable for your
* needs, use gtk_scale_set_digits() to correct it.
*
* Returns: a new #GtkScale
*/
GtkWidget *
gtk_scale_new_with_range (GtkOrientation orientation,
double min,
double max,
double step)
{
GtkAdjustment *adj;
int 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);
if (fabs (step) >= 1.0 || step == 0.0)
{
digits = 0;
}
else
{
digits = abs ((int) floor (log10 (fabs (step))));
if (digits > 5)
digits = 5;
}
return g_object_new (GTK_TYPE_SCALE,
"orientation", orientation,
"adjustment", adj,
"digits", digits,
NULL);
}
/**
* gtk_scale_set_digits:
* @scale: a #GtkScale
* @digits: the number of decimal places to display,
* e.g. use 1 to display 1.0, 2 to display 1.00, etc
*
* Sets the number of decimal places that are displayed in the value. Also
* causes the value of the adjustment to be rounded to this number of digits,
* so the retrieved value matches the displayed one, if #GtkScale:draw-value is
* %TRUE when the value changes. If you want to enforce rounding the value when
* #GtkScale:draw-value is %FALSE, you can set #GtkRange:round-digits instead.
*
* Note that rounding to a small number of digits can interfere with
* the smooth autoscrolling that is built into #GtkScale. As an alternative,
* you can use gtk_scale_set_format_value_func() to format the displayed
* value yourself.
*/
void
gtk_scale_set_digits (GtkScale *scale,
int digits)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
GtkRange *range;
g_return_if_fail (GTK_IS_SCALE (scale));
range = GTK_RANGE (scale);
digits = CLAMP (digits, -1, MAX_DIGITS);
if (priv->digits != digits)
{
priv->digits = digits;
if (priv->draw_value)
gtk_range_set_round_digits (range, digits);
gtk_widget_queue_resize (GTK_WIDGET (scale));
g_object_notify_by_pspec (G_OBJECT (scale), properties[PROP_DIGITS]);
}
}
/**
* gtk_scale_get_digits:
* @scale: a #GtkScale
*
* Gets the number of decimal places that are displayed in the value.
*
* Returns: the number of decimal places that are displayed
*/
int
gtk_scale_get_digits (GtkScale *scale)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
g_return_val_if_fail (GTK_IS_SCALE (scale), -1);
return priv->digits;
}
static void
update_value_position (GtkScale *scale)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
if (!priv->value_widget)
return;
gtk_widget_remove_css_class (priv->value_widget, "top");
gtk_widget_remove_css_class (priv->value_widget, "right");
gtk_widget_remove_css_class (priv->value_widget, "bottom");
gtk_widget_remove_css_class (priv->value_widget, "left");
switch (priv->value_pos)
{
case GTK_POS_TOP:
gtk_widget_add_css_class (priv->value_widget, "top");
break;
case GTK_POS_RIGHT:
gtk_widget_add_css_class (priv->value_widget, "right");
break;
case GTK_POS_BOTTOM:
gtk_widget_add_css_class (priv->value_widget, "bottom");
break;
case GTK_POS_LEFT:
gtk_widget_add_css_class (priv->value_widget, "left");
break;
default:
g_assert_not_reached ();
break;
}
}
/**
* gtk_scale_set_draw_value:
* @scale: a #GtkScale
* @draw_value: %TRUE to draw the value
*
* Specifies whether the current value is displayed as a string next
* to the slider.
*/
void
gtk_scale_set_draw_value (GtkScale *scale,
gboolean draw_value)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
g_return_if_fail (GTK_IS_SCALE (scale));
draw_value = draw_value != FALSE;
if (priv->draw_value != draw_value)
{
priv->draw_value = draw_value;
if (draw_value)
{
char *txt;
txt = gtk_scale_format_value (scale,
gtk_adjustment_get_value (gtk_range_get_adjustment (GTK_RANGE (scale))));
priv->value_widget = g_object_new (GTK_TYPE_LABEL,
"css-name", "value",
"label", txt,
NULL);
g_free (txt);
gtk_widget_insert_after (priv->value_widget, GTK_WIDGET (scale), NULL);
gtk_range_set_round_digits (GTK_RANGE (scale), priv->digits);
update_value_position (scale);
update_label_request (scale);
}
else if (priv->value_widget)
{
g_clear_pointer (&priv->value_widget, gtk_widget_unparent);
gtk_range_set_round_digits (GTK_RANGE (scale), -1);
}
g_object_notify_by_pspec (G_OBJECT (scale), properties[PROP_DRAW_VALUE]);
}
}
/**
* gtk_scale_get_draw_value:
* @scale: a #GtkScale
*
* Returns whether the current value is displayed as a string
* next to the slider.
*
* Returns: whether the current value is displayed as a string
*/
gboolean
gtk_scale_get_draw_value (GtkScale *scale)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
g_return_val_if_fail (GTK_IS_SCALE (scale), FALSE);
return priv->draw_value;
}
/**
* gtk_scale_set_has_origin:
* @scale: a #GtkScale
* @has_origin: %TRUE if the scale has an origin
*
* If #GtkScale:has-origin is set to %TRUE (the default), the scale will
* highlight the part of the trough between the origin (bottom or left side)
* and the current value.
*/
void
gtk_scale_set_has_origin (GtkScale *scale,
gboolean has_origin)
{
g_return_if_fail (GTK_IS_SCALE (scale));
has_origin = has_origin != FALSE;
if (_gtk_range_get_has_origin (GTK_RANGE (scale)) != has_origin)
{
_gtk_range_set_has_origin (GTK_RANGE (scale), has_origin);
gtk_widget_queue_draw (GTK_WIDGET (scale));
g_object_notify_by_pspec (G_OBJECT (scale), properties[PROP_HAS_ORIGIN]);
}
}
/**
* gtk_scale_get_has_origin:
* @scale: a #GtkScale
*
* Returns whether the scale has an origin.
*
* Returns: %TRUE if the scale has an origin.
*/
gboolean
gtk_scale_get_has_origin (GtkScale *scale)
{
g_return_val_if_fail (GTK_IS_SCALE (scale), FALSE);
return _gtk_range_get_has_origin (GTK_RANGE (scale));
}
/**
* gtk_scale_set_value_pos:
* @scale: a #GtkScale
* @pos: the position in which the current value is displayed
*
* Sets the position in which the current value is displayed.
*/
void
gtk_scale_set_value_pos (GtkScale *scale,
GtkPositionType pos)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
g_return_if_fail (GTK_IS_SCALE (scale));
if (priv->value_pos != pos)
{
priv->value_pos = pos;
update_value_position (scale);
gtk_widget_queue_resize (GTK_WIDGET (scale));
g_object_notify_by_pspec (G_OBJECT (scale), properties[PROP_VALUE_POS]);
}
}
/**
* gtk_scale_get_value_pos:
* @scale: a #GtkScale
*
* Gets the position in which the current value is displayed.
*
* Returns: the position in which the current value is displayed
*/
GtkPositionType
gtk_scale_get_value_pos (GtkScale *scale)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
g_return_val_if_fail (GTK_IS_SCALE (scale), 0);
return priv->value_pos;
}
static void
gtk_scale_get_range_border (GtkRange *range,
GtkBorder *border)
{
GtkScale *scale = GTK_SCALE (range);
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
border->left = 0;
border->right = 0;
border->top = 0;
border->bottom = 0;
if (priv->value_widget)
{
int value_size;
GtkOrientation value_orientation;
if (priv->value_pos == GTK_POS_LEFT || priv->value_pos == GTK_POS_RIGHT)
value_orientation = GTK_ORIENTATION_HORIZONTAL;
else
value_orientation = GTK_ORIENTATION_VERTICAL;
gtk_widget_measure (priv->value_widget,
value_orientation, -1,
&value_size, NULL,
NULL, NULL);
switch (priv->value_pos)
{
case GTK_POS_LEFT:
border->left += value_size;
break;
case GTK_POS_RIGHT:
border->right += value_size;
break;
case GTK_POS_TOP:
border->top += value_size;
break;
case GTK_POS_BOTTOM:
border->bottom += value_size;
break;
default:
g_assert_not_reached ();
break;
}
}
if (gtk_orientable_get_orientation (GTK_ORIENTABLE (range)) == GTK_ORIENTATION_HORIZONTAL)
{
int height;
if (priv->top_marks_widget)
{
gtk_widget_measure (priv->top_marks_widget,
GTK_ORIENTATION_VERTICAL, -1,
&height, NULL,
NULL, NULL);
if (height > 0)
border->top += height;
}
if (priv->bottom_marks_widget)
{
gtk_widget_measure (priv->bottom_marks_widget,
GTK_ORIENTATION_VERTICAL, -1,
&height, NULL,
NULL, NULL);
if (height > 0)
border->bottom += height;
}
}
else
{
int width;
if (priv->top_marks_widget)
{
gtk_widget_measure (priv->top_marks_widget,
GTK_ORIENTATION_HORIZONTAL, -1,
&width, NULL,
NULL, NULL);
if (width > 0)
border->left += width;
}
if (priv->bottom_marks_widget)
{
gtk_widget_measure (priv->bottom_marks_widget,
GTK_ORIENTATION_HORIZONTAL, -1,
&width, NULL,
NULL, NULL);
if (width > 0)
border->right += width;
}
}
}
static void
gtk_scale_measure_mark (GtkGizmo *gizmo,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkScaleMark *mark = g_object_get_data (G_OBJECT (gizmo), "mark");
gtk_widget_measure (mark->indicator_widget,
orientation, -1,
minimum, natural,
NULL, NULL);
if (mark->label_widget)
{
int label_min, label_nat;
gtk_widget_measure (mark->label_widget,
orientation, -1,
&label_min, &label_nat,
NULL, NULL);
*minimum += label_min;
*natural += label_nat;
}
}
static void
gtk_scale_measure_marks (GtkGizmo *gizmo,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkWidget *widget = GTK_WIDGET (gizmo);
GtkScale *scale = GTK_SCALE (gtk_widget_get_parent (widget));;
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
GtkOrientation scale_orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (scale));
GSList *m;
*minimum = *natural = 0;
for (m = priv->marks; m; m = m->next)
{
GtkScaleMark *mark = m->data;
int mark_size;
if ((mark->position == GTK_POS_TOP && widget == priv->bottom_marks_widget) ||
(mark->position == GTK_POS_BOTTOM && widget == priv->top_marks_widget))
continue;
gtk_widget_measure (mark->widget,
orientation, -1,
&mark_size, NULL,
NULL, NULL);
if (scale_orientation == orientation)
{
*minimum += mark_size;
*natural += mark_size;
}
else
{
*minimum = MAX (*minimum, mark_size);
*natural = MAX (*natural, mark_size);
}
}
}
static void
gtk_scale_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkScale *scale = GTK_SCALE (widget);
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
GtkOrientation scale_orientation;
GTK_WIDGET_CLASS (gtk_scale_parent_class)->measure (widget,
orientation,
for_size,
minimum, natural,
minimum_baseline, natural_baseline);
scale_orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (widget));
if (scale_orientation == orientation)
{
int top_marks_size = 0, bottom_marks_size = 0, marks_size;
if (priv->top_marks_widget)
gtk_widget_measure (priv->top_marks_widget,
orientation, for_size,
&top_marks_size, NULL,
NULL, NULL);
if (priv->bottom_marks_widget)
gtk_widget_measure (priv->bottom_marks_widget,
orientation, for_size,
&bottom_marks_size, NULL,
NULL, NULL);
marks_size = MAX (top_marks_size, bottom_marks_size);
*minimum = MAX (*minimum, marks_size);
*natural = MAX (*natural, marks_size);
}
if (priv->value_widget)
{
int min, nat;
gtk_widget_measure (priv->value_widget, orientation, -1, &min, &nat, NULL, NULL);
if (priv->value_pos == GTK_POS_TOP ||
priv->value_pos == GTK_POS_BOTTOM)
{
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
*minimum = MAX (*minimum, min);
*natural = MAX (*natural, nat);
}
else
{
*minimum += min;
*natural += nat;
}
}
else
{
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
*minimum += min;
*natural += nat;
}
else
{
*minimum = MAX (*minimum, min);
*natural = MAX (*natural, nat);
}
}
}
}
static void
gtk_scale_real_get_layout_offsets (GtkScale *scale,
int *x,
int *y)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
graphene_rect_t value_bounds;
if (!priv->value_widget ||
!gtk_widget_compute_bounds (priv->value_widget, GTK_WIDGET (scale), &value_bounds))
{
*x = 0;
*y = 0;
return;
}
*x = value_bounds.origin.x;
*y = value_bounds.origin.y;
}
static char *
weed_out_neg_zero (char *str,
int digits)
{
if (str[0] == '-')
{
char neg_zero[8];
g_snprintf (neg_zero, 8, "%0.*f", digits, -0.0);
if (strcmp (neg_zero, str) == 0)
memmove (str, str + 1, strlen (str));
}
return str;
}
static char *
gtk_scale_format_value (GtkScale *scale,
double value)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
if (priv->format_value_func)
{
return priv->format_value_func (scale, value, priv->format_value_func_user_data);
}
else
{
char *fmt = g_strdup_printf ("%0.*f", priv->digits, value);
return weed_out_neg_zero (fmt, priv->digits);
}
}
static void
gtk_scale_finalize (GObject *object)
{
GtkScale *scale = GTK_SCALE (object);
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
gtk_scale_clear_marks (scale);
g_clear_pointer (&priv->value_widget, gtk_widget_unparent);
if (priv->format_value_func_destroy_notify)
priv->format_value_func_destroy_notify (priv->format_value_func_user_data);
G_OBJECT_CLASS (gtk_scale_parent_class)->finalize (object);
}
/**
* gtk_scale_get_layout:
* @scale: A #GtkScale
*
* Gets the #PangoLayout used to display the scale. The returned
* object is owned by the scale so does not need to be freed by
* the caller.
*
* Returns: (transfer none) (nullable): the #PangoLayout for this scale,
* or %NULL if the #GtkScale:draw-value property is %FALSE.
*/
PangoLayout *
gtk_scale_get_layout (GtkScale *scale)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
g_return_val_if_fail (GTK_IS_SCALE (scale), NULL);
if (priv->value_widget)
return gtk_label_get_layout (GTK_LABEL (priv->value_widget));
return NULL;
}
/**
* gtk_scale_get_layout_offsets:
* @scale: a #GtkScale
* @x: (out) (allow-none): location to store X offset of layout, or %NULL
* @y: (out) (allow-none): location to store Y offset of layout, or %NULL
*
* Obtains the coordinates where the scale will draw the
* #PangoLayout representing the text in the scale. Remember
* when using the #PangoLayout function you need to convert to
* and from pixels using PANGO_PIXELS() or #PANGO_SCALE.
*
* If the #GtkScale:draw-value property is %FALSE, the return
* values are undefined.
*/
void
gtk_scale_get_layout_offsets (GtkScale *scale,
int *x,
int *y)
{
int local_x = 0;
int local_y = 0;
g_return_if_fail (GTK_IS_SCALE (scale));
if (GTK_SCALE_GET_CLASS (scale)->get_layout_offsets)
(GTK_SCALE_GET_CLASS (scale)->get_layout_offsets) (scale, &local_x, &local_y);
if (x)
*x = local_x;
if (y)
*y = local_y;
}
static void
gtk_scale_mark_free (gpointer data)
{
GtkScaleMark *mark = data;
if (mark->label_widget)
gtk_widget_unparent (mark->label_widget);
gtk_widget_unparent (mark->indicator_widget);
gtk_widget_unparent (mark->widget);
g_free (mark->markup);
g_free (mark);
}
/**
* gtk_scale_clear_marks:
* @scale: a #GtkScale
*
* Removes any marks that have been added with gtk_scale_add_mark().
*/
void
gtk_scale_clear_marks (GtkScale *scale)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
g_return_if_fail (GTK_IS_SCALE (scale));
g_slist_free_full (priv->marks, gtk_scale_mark_free);
priv->marks = NULL;
g_clear_pointer (&priv->top_marks_widget, gtk_widget_unparent);
g_clear_pointer (&priv->bottom_marks_widget, gtk_widget_unparent);
gtk_widget_remove_css_class (GTK_WIDGET (scale), "marks-before");
gtk_widget_remove_css_class (GTK_WIDGET (scale), "marks-after");
_gtk_range_set_stop_values (GTK_RANGE (scale), NULL, 0);
gtk_widget_queue_resize (GTK_WIDGET (scale));
}
/**
* gtk_scale_add_mark:
* @scale: a #GtkScale
* @value: the value at which the mark is placed, must be between
* the lower and upper limits of the scales’ adjustment
* @position: where to draw the mark. For a horizontal scale, #GTK_POS_TOP
* and %GTK_POS_LEFT are drawn above the scale, anything else below.
* For a vertical scale, #GTK_POS_LEFT and %GTK_POS_TOP are drawn to
* the left of the scale, anything else to the right.
* @markup: (allow-none): Text to be shown at the mark, using [Pango markup][PangoMarkupFormat], or %NULL
*
*
* Adds a mark at @value.
*
* A mark is indicated visually by drawing a tick mark next to the scale,
* and GTK makes it easy for the user to position the scale exactly at the
* marks value.
*
* If @markup is not %NULL, text is shown next to the tick mark.
*
* To remove marks from a scale, use gtk_scale_clear_marks().
*/
void
gtk_scale_add_mark (GtkScale *scale,
double value,
GtkPositionType position,
const char *markup)
{
GtkWidget *widget;
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
GtkScaleMark *mark;
GSList *m;
double *values;
int n, i;
GtkWidget *marks_widget;
g_return_if_fail (GTK_IS_SCALE (scale));
widget = GTK_WIDGET (scale);
mark = g_new0 (GtkScaleMark, 1);
mark->value = value;
mark->markup = g_strdup (markup);
if (position == GTK_POS_LEFT ||
position == GTK_POS_TOP)
mark->position = GTK_POS_TOP;
else
mark->position = GTK_POS_BOTTOM;
priv->marks = g_slist_insert_sorted_with_data (priv->marks, mark,
compare_marks,
GINT_TO_POINTER (gtk_range_get_inverted (GTK_RANGE (scale))));
if (mark->position == GTK_POS_TOP)
{
if (!priv->top_marks_widget)
{
priv->top_marks_widget = gtk_gizmo_new ("marks",
gtk_scale_measure_marks,
gtk_scale_allocate_marks,
NULL,
NULL,
NULL, NULL);
gtk_widget_insert_after (priv->top_marks_widget,
GTK_WIDGET (scale),
priv->value_widget);
gtk_widget_add_css_class (priv->top_marks_widget, "top");
}
marks_widget = priv->top_marks_widget;
}
else
{
if (!priv->bottom_marks_widget)
{
priv->bottom_marks_widget = gtk_gizmo_new ("marks",
gtk_scale_measure_marks,
gtk_scale_allocate_marks,
NULL,
NULL,
NULL, NULL);
gtk_widget_insert_before (priv->bottom_marks_widget,
GTK_WIDGET (scale),
gtk_range_get_trough_widget (GTK_RANGE (scale)));
gtk_widget_add_css_class (priv->bottom_marks_widget, "bottom");
}
marks_widget = priv->bottom_marks_widget;
}
mark->widget = gtk_gizmo_new ("mark", gtk_scale_measure_mark, gtk_scale_allocate_mark, NULL, NULL, NULL, NULL);
g_object_set_data (G_OBJECT (mark->widget), "mark", mark);
mark->indicator_widget = gtk_gizmo_new ("indicator", NULL, NULL, NULL, NULL, NULL, NULL);
gtk_widget_set_parent (mark->indicator_widget, mark->widget);
if (mark->markup && *mark->markup)
{
mark->label_widget = g_object_new (GTK_TYPE_LABEL,
"use-markup", TRUE,
"label", mark->markup,
NULL);
if (marks_widget == priv->top_marks_widget)
gtk_widget_insert_after (mark->label_widget, mark->widget, NULL);
else
gtk_widget_insert_before (mark->label_widget, mark->widget, NULL);
}
m = g_slist_find (priv->marks, mark);
m = m->next;
while (m)
{
GtkScaleMark *next = m->data;
if (next->position == mark->position)
break;
m = m->next;
}
if (m)
{
GtkScaleMark *next = m->data;
gtk_widget_insert_before (mark->widget, marks_widget, next->widget);
}
else
{
gtk_widget_set_parent (mark->widget, marks_widget);
}
n = g_slist_length (priv->marks);
values = g_new (double, n);
for (m = priv->marks, i = 0; m; m = m->next, i++)
{
mark = m->data;
values[i] = mark->value;
}
_gtk_range_set_stop_values (GTK_RANGE (scale), values, n);
g_free (values);
if (priv->top_marks_widget)
gtk_widget_add_css_class (GTK_WIDGET (scale), "marks-before");
if (priv->bottom_marks_widget)
gtk_widget_add_css_class (GTK_WIDGET (scale), "marks-after");
gtk_widget_queue_resize (widget);
}
static GtkBuildableIface *parent_buildable_iface;
static void
gtk_scale_buildable_interface_init (GtkBuildableIface *iface)
{
parent_buildable_iface = g_type_interface_peek_parent (iface);
iface->custom_tag_start = gtk_scale_buildable_custom_tag_start;
iface->custom_finished = gtk_scale_buildable_custom_finished;
}
typedef struct
{
GtkScale *scale;
GtkBuilder *builder;
GSList *marks;
} MarksSubparserData;
typedef struct
{
double value;
GtkPositionType position;
GString *markup;
char *context;
gboolean translatable;
} MarkData;
static void
mark_data_free (MarkData *data)
{
g_string_free (data->markup, TRUE);
g_free (data->context);
g_slice_free (MarkData, data);
}
static void
marks_start_element (GtkBuildableParseContext *context,
const char *element_name,
const char **names,
const char **values,
gpointer user_data,
GError **error)
{
MarksSubparserData *data = (MarksSubparserData*)user_data;
if (strcmp (element_name, "marks") == 0)
{
if (!_gtk_builder_check_parent (data->builder, context, "object", error))
return;
if (!g_markup_collect_attributes (element_name, names, values, error,
G_MARKUP_COLLECT_INVALID, NULL, NULL,
G_MARKUP_COLLECT_INVALID))
_gtk_builder_prefix_error (data->builder, context, error);
}
else if (strcmp (element_name, "mark") == 0)
{
const char *value_str;
double value = 0;
const char *position_str = NULL;
GtkPositionType position = GTK_POS_BOTTOM;
const char *msg_context = NULL;
gboolean translatable = FALSE;
MarkData *mark;
if (!_gtk_builder_check_parent (data->builder, context, "marks", error))
return;
if (!g_markup_collect_attributes (element_name, names, values, error,
G_MARKUP_COLLECT_STRING, "value", &value_str,
G_MARKUP_COLLECT_BOOLEAN|G_MARKUP_COLLECT_OPTIONAL, "translatable", &translatable,
G_MARKUP_COLLECT_STRING|G_MARKUP_COLLECT_OPTIONAL, "comments", NULL,
G_MARKUP_COLLECT_STRING|G_MARKUP_COLLECT_OPTIONAL, "context", &msg_context,
G_MARKUP_COLLECT_STRING|G_MARKUP_COLLECT_OPTIONAL, "position", &position_str,
G_MARKUP_COLLECT_INVALID))
{
_gtk_builder_prefix_error (data->builder, context, error);
return;
}
if (value_str != NULL)
{
GValue gvalue = G_VALUE_INIT;
if (!gtk_builder_value_from_string_type (data->builder, G_TYPE_DOUBLE, value_str, &gvalue, error))
{
_gtk_builder_prefix_error (data->builder, context, error);
return;
}
value = g_value_get_double (&gvalue);
}
if (position_str != NULL)
{
GValue gvalue = G_VALUE_INIT;
if (!gtk_builder_value_from_string_type (data->builder, GTK_TYPE_POSITION_TYPE, position_str, &gvalue, error))
{
_gtk_builder_prefix_error (data->builder, context, error);
return;
}
position = g_value_get_enum (&gvalue);
}
mark = g_slice_new (MarkData);
mark->value = value;
if (position == GTK_POS_LEFT || position == GTK_POS_TOP)
mark->position = GTK_POS_TOP;
else
mark->position = GTK_POS_BOTTOM;
mark->markup = g_string_new ("");
mark->context = g_strdup (msg_context);
mark->translatable = translatable;
data->marks = g_slist_prepend (data->marks, mark);
}
else
{
_gtk_builder_error_unhandled_tag (data->builder, context,
"GtkScale", element_name,
error);
}
}
static void
marks_text (GtkBuildableParseContext *context,
const char *text,
gsize text_len,
gpointer user_data,
GError **error)
{
MarksSubparserData *data = (MarksSubparserData*)user_data;
if (strcmp (gtk_buildable_parse_context_get_element (context), "mark") == 0)
{
MarkData *mark = data->marks->data;
g_string_append_len (mark->markup, text, text_len);
}
}
static const GtkBuildableParser marks_parser =
{
marks_start_element,
NULL,
marks_text,
};
static gboolean
gtk_scale_buildable_custom_tag_start (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const char *tagname,
GtkBuildableParser *parser,
gpointer *parser_data)
{
MarksSubparserData *data;
if (child)
return FALSE;
if (strcmp (tagname, "marks") == 0)
{
data = g_slice_new0 (MarksSubparserData);
data->scale = GTK_SCALE (buildable);
data->builder = builder;
data->marks = NULL;
*parser = marks_parser;
*parser_data = data;
return TRUE;
}
return parent_buildable_iface->custom_tag_start (buildable, builder, child,
tagname, parser, parser_data);
}
static void
gtk_scale_buildable_custom_finished (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const char *tagname,
gpointer user_data)
{
GtkScale *scale = GTK_SCALE (buildable);
MarksSubparserData *marks_data;
if (strcmp (tagname, "marks") == 0)
{
GSList *m;
const char *markup;
marks_data = (MarksSubparserData *)user_data;
for (m = marks_data->marks; m; m = m->next)
{
MarkData *mdata = m->data;
if (mdata->translatable && mdata->markup->len)
markup = _gtk_builder_parser_translate (gtk_builder_get_translation_domain (builder),
mdata->context,
mdata->markup->str);
else
markup = mdata->markup->str;
gtk_scale_add_mark (scale, mdata->value, mdata->position, markup);
mark_data_free (mdata);
}
g_slist_free (marks_data->marks);
g_slice_free (MarksSubparserData, marks_data);
}
else
{
parent_buildable_iface->custom_finished (buildable, builder, child,
tagname, user_data);
}
}
/**
* gtk_scale_set_format_value_func:
* @scale: a #GtkScale
* @func: (nullable): function that formats the value
* @user_data: (closure): user data to pass to @func
* @destroy_notify: (nullable): destroy function for @user_data
*
* @func allows you to change how the scale value is displayed. The given
* function will return an allocated string representing @value.
* That string will then be used to display the scale's value.
*
* If #NULL is passed as @func, the value will be displayed on
* its own, rounded according to the value of the #GtkScale:digits property.
*/
void
gtk_scale_set_format_value_func (GtkScale *scale,
GtkScaleFormatValueFunc func,
gpointer user_data,
GDestroyNotify destroy_notify)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
GtkAdjustment *adjustment;
char *text;
g_return_if_fail (GTK_IS_SCALE (scale));
if (priv->format_value_func_destroy_notify)
priv->format_value_func_destroy_notify (priv->format_value_func_user_data);
priv->format_value_func = func;
priv->format_value_func_user_data = user_data;
priv->format_value_func_destroy_notify = destroy_notify;
if (!priv->value_widget)
return;
update_label_request (scale);
adjustment = gtk_range_get_adjustment (GTK_RANGE (scale));
text = gtk_scale_format_value (scale,
gtk_adjustment_get_value (adjustment));
gtk_label_set_label (GTK_LABEL (priv->value_widget), text);
g_free (text);
}
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