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gtk2/gtk/gtkscale.c
Timm Bäder 327777a291 Scale: Set the correct value alignment 
We're measuring both the width of the minimal and the maximal value for
the value gadget, but only give the value the minimal width for its
current value, resultnig in an always left-aligned value.

Fix this by assigning the width of the value gadget to the value layout
and letting pango align the text inside the layout.

https://bugzilla.gnome.org/show_bug.cgi?id=766120
2016-05-10 21:24:50 +02:00

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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 <math.h>
#include <stdlib.h>
#include "gtkrangeprivate.h"
#include "gtkadjustment.h"
#include "gtkbindings.h"
#include "gtkbuildable.h"
#include "gtkbuilderprivate.h"
#include "gtkcsscustomgadgetprivate.h"
#include "gtkicontheme.h"
#include "gtkintl.h"
#include "gtkmarshalers.h"
#include "gtkorientable.h"
#include "gtkprivate.h"
#include "gtktypebuiltins.h"
#include "gtkstylecontextprivate.h"
#include "gtkwidgetprivate.h"
#include "a11y/gtkscaleaccessible.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.top
* │ ├── mark
* │ ┊ ├── [label]
* │ ┊ ╰── indicator
* ┊ ┊
* │ ╰── mark
* ├── contents
* │ ╰── trough
* │ ├── slider
* │ ├── [highlight]
* │ ╰── [fill]
* ╰── marks.bottom
* ├── mark
* ┊ ├── indicator
* ┊ ╰── [label]
* ╰── mark
* ]|
*
* 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 contents
* 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.
*/
#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;
struct _GtkScalePrivate
{
PangoLayout *layout;
GSList *marks;
GtkCssGadget *top_marks_gadget;
GtkCssGadget *bottom_marks_gadget;
GtkCssGadget *value_gadget;
gint digits;
guint draw_value : 1;
guint value_pos : 2;
};
struct _GtkScaleMark
{
gdouble value;
int stop_position;
gchar *markup;
PangoLayout *layout;
GtkCssGadget *gadget;
GtkCssGadget *indicator_gadget;
GtkCssGadget *label_gadget;
GtkPositionType position; /* always GTK_POS_TOP or GTK_POS_BOTTOM */
};
enum {
PROP_0,
PROP_DIGITS,
PROP_DRAW_VALUE,
PROP_HAS_ORIGIN,
PROP_VALUE_POS,
LAST_PROP
};
enum {
FORMAT_VALUE,
LAST_SIGNAL
};
static GParamSpec *properties[LAST_PROP];
static guint signals[LAST_SIGNAL];
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_get_preferred_width (GtkWidget *widget,
gint *minimum,
gint *natural);
static void gtk_scale_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural);
static void gtk_scale_style_updated (GtkWidget *widget);
static void gtk_scale_get_range_border (GtkRange *range,
GtkBorder *border);
static void gtk_scale_finalize (GObject *object);
static void gtk_scale_screen_changed (GtkWidget *widget,
GdkScreen *old_screen);
static gboolean gtk_scale_draw (GtkWidget *widget,
cairo_t *cr);
static void gtk_scale_real_get_layout_offsets (GtkScale *scale,
gint *x,
gint *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 gchar *tagname,
GMarkupParser *parser,
gpointer *data);
static void gtk_scale_buildable_custom_finished (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *tagname,
gpointer user_data);
static void gtk_scale_clear_layout (GtkScale *scale);
static gchar * gtk_scale_format_value (GtkScale *scale,
gdouble 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 gint
compare_marks (gconstpointer a, gconstpointer b, gpointer data)
{
gboolean inverted = GPOINTER_TO_INT (data);
gint 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
gtk_scale_notify (GObject *object,
GParamSpec *pspec)
{
if (strcmp (pspec->name, "inverted") == 0)
{
GtkScale *scale = GTK_SCALE (object);
GtkScaleMark *mark;
GSList *m;
gint i, n;
gdouble *values;
scale->priv->marks = g_slist_sort_with_data (scale->priv->marks,
compare_marks,
GINT_TO_POINTER (gtk_range_get_inverted (GTK_RANGE (scale))));
n = g_slist_length (scale->priv->marks);
values = g_new (gdouble, n);
for (m = scale->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 (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,
GtkAllocation *out_clip)
{
GtkScalePrivate *priv = scale->priv;
GtkWidget *widget = GTK_WIDGET (scale);
GtkRange *range = GTK_RANGE (widget);
GtkCssGadget *range_gadget, *slider_gadget;
GtkAllocation range_alloc, slider_alloc, value_alloc;
range_gadget = gtk_range_get_gadget (range);
gtk_css_gadget_get_margin_allocation (range_gadget, &range_alloc, NULL);
slider_gadget = gtk_range_get_slider_gadget (range);
gtk_css_gadget_get_border_allocation (slider_gadget, &slider_alloc, NULL);
gtk_css_gadget_get_preferred_size (priv->value_gadget,
GTK_ORIENTATION_HORIZONTAL, -1,
&value_alloc.width, NULL,
NULL, NULL);
gtk_css_gadget_get_preferred_size (priv->value_gadget,
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 = range_alloc.x;
value_alloc.y = range_alloc.y + (range_alloc.height - value_alloc.height) / 2;
break;
case GTK_POS_RIGHT:
value_alloc.x = range_alloc.x + range_alloc.width - value_alloc.width;
value_alloc.y = range_alloc.y + (range_alloc.height - value_alloc.height) / 2;
break;
case GTK_POS_TOP:
value_alloc.x = slider_alloc.x + (slider_alloc.width - value_alloc.width) / 2;
value_alloc.x = CLAMP (value_alloc.x, range_alloc.x, range_alloc.x + range_alloc.width - value_alloc.width);
value_alloc.y = range_alloc.y;
break;
case GTK_POS_BOTTOM:
value_alloc.x = slider_alloc.x + (slider_alloc.width - value_alloc.width) / 2;
value_alloc.x = CLAMP (value_alloc.x, range_alloc.x, range_alloc.x + range_alloc.width - value_alloc.width);
value_alloc.y = range_alloc.y + range_alloc.height - value_alloc.height;
break;
default:
g_return_if_reached ();
break;
}
}
else
{
switch (priv->value_pos)
{
case GTK_POS_LEFT:
value_alloc.x = range_alloc.x;
value_alloc.y = slider_alloc.y + (slider_alloc.height - value_alloc.height) / 2;
value_alloc.y = CLAMP (value_alloc.y, range_alloc.y, range_alloc.y + range_alloc.height - value_alloc.height);
break;
case GTK_POS_RIGHT:
value_alloc.x = range_alloc.x + range_alloc.width - value_alloc.width;
value_alloc.y = slider_alloc.y + (slider_alloc.height - value_alloc.height) / 2;
value_alloc.y = CLAMP (value_alloc.y, range_alloc.y, range_alloc.y + range_alloc.height - value_alloc.height);
break;
case GTK_POS_TOP:
value_alloc.x = range_alloc.x + (range_alloc.width - value_alloc.width) / 2;
value_alloc.y = range_alloc.y;
break;
case GTK_POS_BOTTOM:
value_alloc.x = range_alloc.x + (range_alloc.width - value_alloc.width) / 2;
value_alloc.y = range_alloc.y + range_alloc.height - value_alloc.height;
break;
default:
g_return_if_reached ();
}
}
gtk_css_gadget_allocate (priv->value_gadget,
&value_alloc, -1,
out_clip);
}
static void
gtk_scale_allocate_mark (GtkCssGadget *gadget,
const GtkAllocation *allocation,
int baseline,
GtkAllocation *out_clip,
gpointer user_data)
{
GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
GtkScaleMark *mark = user_data;
GtkAllocation indicator_alloc, widget_alloc;
int indicator_width, indicator_height;
GtkOrientation orientation;
orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (widget));
gtk_widget_get_allocation (widget, &widget_alloc);
gtk_css_gadget_get_preferred_size (mark->indicator_gadget,
GTK_ORIENTATION_HORIZONTAL, -1,
&indicator_width, NULL,
NULL, NULL);
gtk_css_gadget_get_preferred_size (mark->indicator_gadget,
GTK_ORIENTATION_VERTICAL, -1,
&indicator_height, NULL,
NULL, NULL);
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
indicator_alloc.x = mark->stop_position + widget_alloc.x - indicator_width / 2;
if (mark->position == GTK_POS_TOP)
indicator_alloc.y = allocation->y + allocation->height - indicator_height;
else
indicator_alloc.y = allocation->y;
indicator_alloc.width = indicator_width;
indicator_alloc.height = indicator_height;
}
else
{
if (mark->position == GTK_POS_TOP)
indicator_alloc.x = allocation->x + allocation->width - indicator_width;
else
indicator_alloc.x = allocation->x;
indicator_alloc.y = mark->stop_position + widget_alloc.y - indicator_height / 2;
indicator_alloc.width = indicator_width;
indicator_alloc.height = indicator_height;
}
gtk_css_gadget_allocate (mark->indicator_gadget,
&indicator_alloc, baseline,
out_clip);
if (mark->label_gadget)
{
GtkAllocation label_alloc, label_clip;
label_alloc = *allocation;
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
label_alloc.height = allocation->height - indicator_alloc.height;
if (mark->position == GTK_POS_BOTTOM)
label_alloc.y = indicator_alloc.y + indicator_alloc.height;
}
else
{
label_alloc.width = allocation->width - indicator_alloc.width;
if (mark->position == GTK_POS_BOTTOM)
label_alloc.x = indicator_alloc.x + indicator_alloc.width;
}
gtk_css_gadget_allocate (mark->label_gadget,
&label_alloc, baseline,
&label_clip);
gdk_rectangle_union (out_clip, &label_clip, out_clip);
}
}
static gint
find_next_pos (GtkWidget *widget,
GSList *list,
gint *marks,
GtkPositionType pos)
{
GtkAllocation allocation;
GSList *m;
gint i;
for (m = list->next, i = 1; m; m = m->next, i++)
{
GtkScaleMark *mark = m->data;
if (mark->position == pos)
return marks[i];
}
gtk_widget_get_allocation (widget, &allocation);
if (gtk_orientable_get_orientation (GTK_ORIENTABLE (widget)) == GTK_ORIENTATION_HORIZONTAL)
return allocation.width;
else
return allocation.height;
}
static void
gtk_scale_allocate_marks (GtkCssGadget *gadget,
const GtkAllocation *allocation,
int baseline,
GtkAllocation *out_clip,
gpointer data)
{
GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
GtkScale *scale = GTK_SCALE (widget);
GtkScalePrivate *priv = scale->priv;
GtkOrientation orientation;
int *marks;
int min_pos_before, min_pos_after;
int min_sep = 4;
int i;
int min_pos, max_pos;
GSList *m;
GtkAllocation widget_alloc;
orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (scale));
_gtk_range_get_stop_positions (GTK_RANGE (scale), &marks);
gtk_widget_get_allocation (widget, &widget_alloc);
if (orientation == GTK_ORIENTATION_HORIZONTAL)
min_pos_before = min_pos_after = widget_alloc.x;
else
min_pos_before = min_pos_after = widget_alloc.y;
for (m = priv->marks, i = 0; m; m = m->next, i++)
{
GtkScaleMark *mark = m->data;
GtkAllocation mark_alloc, mark_clip;
int mark_size;
if ((mark->position == GTK_POS_TOP && gadget == priv->bottom_marks_gadget) ||
(mark->position == GTK_POS_BOTTOM && gadget == priv->top_marks_gadget))
continue;
gtk_css_gadget_get_preferred_size (mark->gadget,
orientation, -1,
&mark_size, NULL,
NULL, NULL);
mark->stop_position = marks[i];
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
mark_alloc.x = mark->stop_position + widget_alloc.x;
mark_alloc.y = allocation->y;
mark_alloc.width = mark_size;
mark_alloc.height = allocation->height;
if (mark->position == GTK_POS_TOP)
{
min_pos = min_pos_before;
max_pos = find_next_pos (widget, m, marks + i, GTK_POS_TOP) - min_sep + widget_alloc.x;
}
else
{
min_pos = min_pos_after;
max_pos = find_next_pos (widget, m, marks + i, GTK_POS_BOTTOM) - min_sep + widget_alloc.x;
}
mark_alloc.x -= mark_size / 2;
if (mark_alloc.x < min_pos)
mark_alloc.x = min_pos;
if (mark_alloc.x + mark_size > max_pos)
mark_alloc.x = max_pos - mark_size;
if (mark_alloc.x < 0)
mark_alloc.x = 0;
if (mark->position == GTK_POS_TOP)
min_pos_before = mark_alloc.x + mark_size + min_sep;
else
min_pos_after = mark_alloc.x + mark_size + min_sep;
}
else
{
mark_alloc.x = allocation->x;
mark_alloc.y = mark->stop_position + widget_alloc.y;
mark_alloc.width = allocation->width;
mark_alloc.height = mark_size;
if (mark->position == GTK_POS_TOP)
{
min_pos = min_pos_before;
max_pos = find_next_pos (widget, m, marks + i, GTK_POS_TOP) - min_sep + widget_alloc.y;
}
else
{
min_pos = min_pos_after;
max_pos = find_next_pos (widget, m, marks + i, GTK_POS_BOTTOM) - min_sep + widget_alloc.y;
}
mark_alloc.y -= mark_size / 2;
if (mark_alloc.y < min_pos)
mark_alloc.y = min_pos;
if (mark_alloc.y + mark_size > max_pos)
mark_alloc.y = max_pos - mark_size;
if (mark_alloc.y < 0)
mark_alloc.y = 0;
if (mark->position == GTK_POS_TOP)
min_pos_before = mark_alloc.y + mark_size + min_sep;
else
min_pos_after = mark_alloc.y + mark_size + min_sep;
}
gtk_css_gadget_allocate (mark->gadget, &mark_alloc, baseline, &mark_clip);
gdk_rectangle_union (out_clip, &mark_clip, out_clip);
}
g_free (marks);
}
static void
gtk_scale_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkScale *scale = GTK_SCALE (widget);
GtkScalePrivate *priv = scale->priv;
GtkAllocation clip, marks_clip, range_rect, marks_rect;
GtkOrientation orientation;
GTK_WIDGET_CLASS (gtk_scale_parent_class)->size_allocate (widget, allocation);
gtk_widget_get_clip (widget, &clip);
orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (widget));
gtk_range_get_range_rect (GTK_RANGE (scale), &range_rect);
range_rect.x += allocation->x;
range_rect.y += allocation->y;
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
int marks_height = 0;
if (priv->top_marks_gadget)
{
gtk_css_gadget_get_preferred_size (priv->top_marks_gadget,
GTK_ORIENTATION_VERTICAL, -1,
&marks_height, NULL,
NULL, NULL);
marks_rect = range_rect;
marks_rect.y -= marks_height;
marks_rect.height = marks_height;
gtk_css_gadget_allocate (priv->top_marks_gadget,
&marks_rect,
-1,
&marks_clip);
gdk_rectangle_union (&clip, &marks_clip, &clip);
}
if (priv->bottom_marks_gadget)
{
gtk_css_gadget_get_preferred_size (priv->bottom_marks_gadget,
GTK_ORIENTATION_VERTICAL, -1,
&marks_height, NULL,
NULL, NULL);
marks_rect = range_rect;
marks_rect.y += range_rect.height;
marks_rect.height = marks_height;
gtk_css_gadget_allocate (priv->bottom_marks_gadget,
&marks_rect,
-1,
&marks_clip);
gdk_rectangle_union (&clip, &marks_clip, &clip);
}
}
else
{
int marks_width = 0;
if (priv->top_marks_gadget)
{
gtk_css_gadget_get_preferred_size (priv->top_marks_gadget,
GTK_ORIENTATION_HORIZONTAL, -1,
&marks_width, NULL,
NULL, NULL);
marks_rect = range_rect;
marks_rect.x -= marks_width;
marks_rect.width = marks_width;
gtk_css_gadget_allocate (priv->top_marks_gadget,
&marks_rect,
-1,
&marks_clip);
gdk_rectangle_union (&clip, &marks_clip, &clip);
}
if (priv->bottom_marks_gadget)
{
gtk_css_gadget_get_preferred_size (priv->bottom_marks_gadget,
GTK_ORIENTATION_HORIZONTAL, -1,
&marks_width, NULL,
NULL, NULL);
marks_rect = range_rect;
marks_rect.x += range_rect.width;
marks_rect.width = marks_width;
gtk_css_gadget_allocate (priv->bottom_marks_gadget,
&marks_rect,
-1,
&marks_clip);
gdk_rectangle_union (&clip, &marks_clip, &clip);
}
}
if (priv->value_gadget)
{
GtkAllocation value_clip;
gtk_scale_allocate_value (scale, &value_clip);
gdk_rectangle_union (&clip, &value_clip, &clip);
}
gtk_widget_set_clip (widget, &clip);
}
#define add_slider_binding(binding_set, keyval, mask, scroll) \
gtk_binding_entry_add_signal (binding_set, keyval, mask, \
I_("move-slider"), 1, \
GTK_TYPE_SCROLL_TYPE, scroll)
static void
gtk_scale_class_init (GtkScaleClass *class)
{
GObjectClass *gobject_class;
GtkWidgetClass *widget_class;
GtkRangeClass *range_class;
GtkBindingSet *binding_set;
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->style_updated = gtk_scale_style_updated;
widget_class->screen_changed = gtk_scale_screen_changed;
widget_class->draw = gtk_scale_draw;
widget_class->size_allocate = gtk_scale_size_allocate;
widget_class->get_preferred_width = gtk_scale_get_preferred_width;
widget_class->get_preferred_height = gtk_scale_get_preferred_height;
range_class->get_range_border = gtk_scale_get_range_border;
class->get_layout_offsets = gtk_scale_real_get_layout_offsets;
/**
* GtkScale::format-value:
* @scale: the object which received the signal
* @value: the value to format
*
* Signal which allows you to change how the scale value is displayed.
* Connect a signal handler which returns an allocated string representing
* @value. That string will then be used to display the scale's value.
*
* Here's an example signal handler which displays a value 1.0 as
* with "-->1.0<--".
* |[<!-- language="C" -->
* static gchar*
* format_value_callback (GtkScale *scale,
* gdouble value)
* {
* return g_strdup_printf ("-->\%0.*g<--",
* gtk_scale_get_digits (scale), value);
* }
* ]|
*
* Returns: allocated string representing @value
*/
signals[FORMAT_VALUE] =
g_signal_new (I_("format-value"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkScaleClass, format_value),
_gtk_single_string_accumulator, NULL,
_gtk_marshal_STRING__DOUBLE,
G_TYPE_STRING, 1,
G_TYPE_DOUBLE);
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"),
TRUE,
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);
/**
* GtkScale:slider-length:
*
* Length of scale's slider.
*
* Deprecated: 3.20: Use min-height/min-width CSS properties on the slider
* element instead. The value of this style property is ignored.
*/
gtk_widget_class_install_style_property (widget_class,
g_param_spec_int ("slider-length",
P_("Slider Length"),
P_("Length of scale's slider"),
0, G_MAXINT, 31,
GTK_PARAM_READABLE|G_PARAM_DEPRECATED));
/**
* GtkScale:value-spacing:
*
* Space between value text and the slider/trough area.
*
* Deprecated: 3.20: Use min-height/min-width CSS properties on the value
* element instead. The value of this style property is ignored.
*/
gtk_widget_class_install_style_property (widget_class,
g_param_spec_int ("value-spacing",
P_("Value spacing"),
P_("Space between value text and the slider/trough area"),
0,
G_MAXINT,
2,
GTK_PARAM_READABLE|G_PARAM_DEPRECATED));
/* All bindings (even arrow keys) are on both h/v scale, because
* blind users etc. don't care about scale orientation.
*/
binding_set = gtk_binding_set_by_class (class);
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_accessible_type (widget_class, GTK_TYPE_SCALE_ACCESSIBLE);
gtk_widget_class_set_css_name (widget_class, "scale");
}
static void
gtk_scale_init (GtkScale *scale)
{
GtkScalePrivate *priv;
GtkRange *range = GTK_RANGE (scale);
scale->priv = gtk_scale_get_instance_private (scale);
priv = scale->priv;
priv->value_pos = GTK_POS_TOP;
priv->digits = 1;
gtk_widget_set_can_focus (GTK_WIDGET (scale), TRUE);
gtk_range_set_slider_size_fixed (range, TRUE);
gtk_range_set_slider_use_min_size (range, TRUE);
_gtk_range_set_has_origin (range, TRUE);
gtk_scale_set_draw_value (scale, 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 = scale->priv;
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
*
* Since: 3.0
**/
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
*
* Since: 3.0
*/
GtkWidget *
gtk_scale_new_with_range (GtkOrientation orientation,
gdouble min,
gdouble max,
gdouble step)
{
GtkAdjustment *adj;
gint digits;
g_return_val_if_fail (min < max, NULL);
g_return_val_if_fail (step != 0.0, NULL);
adj = gtk_adjustment_new (min, min, max, step, 10 * step, 0);
if (fabs (step) >= 1.0 || step == 0.0)
{
digits = 0;
}
else
{
digits = abs ((gint) 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 off to this
* number of digits, so the retrieved value matches the value the user saw.
*/
void
gtk_scale_set_digits (GtkScale *scale,
gint digits)
{
GtkScalePrivate *priv;
GtkRange *range;
g_return_if_fail (GTK_IS_SCALE (scale));
priv = scale->priv;
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_scale_clear_layout (scale);
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
*/
gint
gtk_scale_get_digits (GtkScale *scale)
{
g_return_val_if_fail (GTK_IS_SCALE (scale), -1);
return scale->priv->digits;
}
static gboolean
gtk_scale_render_value (GtkCssGadget *gadget,
cairo_t *cr,
int x,
int y,
int width,
int height,
gpointer user_data)
{
GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
GtkScale *scale = GTK_SCALE (widget);
GtkStyleContext *context;
PangoLayout *layout;
context = gtk_widget_get_style_context (widget);
gtk_style_context_save_to_node (context, gtk_css_gadget_get_node (gadget));
layout = gtk_scale_get_layout (scale);
gtk_render_layout (context, cr, x, y, layout);
gtk_style_context_restore (context);
return FALSE;
}
static void
gtk_scale_measure_value (GtkCssGadget *gadget,
GtkOrientation orientation,
gint for_size,
gint *minimum,
gint *natural,
gint *minimum_baseline,
gint *natural_baseline,
gpointer user_data)
{
GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
GtkScale *scale = GTK_SCALE (widget);
GtkScalePrivate *priv = scale->priv;
int width, height;
width = height = 0;
if (priv->draw_value)
{
GtkAdjustment *adjustment;
PangoLayout *layout;
PangoRectangle logical_rect;
gchar *txt;
layout = gtk_widget_create_pango_layout (widget, NULL);
adjustment = gtk_range_get_adjustment (GTK_RANGE (scale));
txt = gtk_scale_format_value (scale, gtk_adjustment_get_lower (adjustment));
pango_layout_set_text (layout, txt, -1);
g_free (txt);
pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
width = logical_rect.width;
height = logical_rect.height;
txt = gtk_scale_format_value (scale, gtk_adjustment_get_upper (adjustment));
pango_layout_set_text (layout, txt, -1);
g_free (txt);
pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
width = MAX (width, logical_rect.width);
height = MAX (height, logical_rect.height);
g_object_unref (layout);
}
if (orientation == GTK_ORIENTATION_HORIZONTAL)
*minimum = *natural = width;
else
*minimum = *natural = height;
}
static void
update_value_position (GtkScale *scale)
{
GtkScalePrivate *priv = scale->priv;
if (!priv->value_gadget)
return;
if (priv->value_pos == GTK_POS_TOP || priv->value_pos == GTK_POS_LEFT)
{
gtk_css_gadget_remove_class (priv->value_gadget, GTK_STYLE_CLASS_BOTTOM);
gtk_css_gadget_add_class (priv->value_gadget, GTK_STYLE_CLASS_TOP);
}
else
{
gtk_css_gadget_remove_class (priv->value_gadget, GTK_STYLE_CLASS_TOP);
gtk_css_gadget_add_class (priv->value_gadget, GTK_STYLE_CLASS_BOTTOM);
}
}
/**
* 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;
GtkWidget *widget;
g_return_if_fail (GTK_IS_SCALE (scale));
priv = scale->priv;
widget = GTK_WIDGET (scale);
draw_value = draw_value != FALSE;
if (priv->draw_value != draw_value)
{
priv->draw_value = draw_value;
if (draw_value)
{
GtkCssNode *widget_node;
widget_node = gtk_widget_get_css_node (widget);
priv->value_gadget = gtk_css_custom_gadget_new ("value",
widget, NULL, NULL,
gtk_scale_measure_value,
NULL,
gtk_scale_render_value,
NULL, NULL);
if (priv->value_pos == GTK_POS_TOP || priv->value_pos == GTK_POS_LEFT)
gtk_css_node_insert_after (widget_node, gtk_css_gadget_get_node (priv->value_gadget), NULL);
else
gtk_css_node_insert_before (widget_node, gtk_css_gadget_get_node (priv->value_gadget), NULL);
gtk_range_set_round_digits (GTK_RANGE (scale), priv->digits);
update_value_position (scale);
}
else
{
if (priv->value_gadget)
gtk_css_node_set_parent (gtk_css_gadget_get_node (priv->value_gadget), NULL);
g_clear_object (&priv->value_gadget);
gtk_range_set_round_digits (GTK_RANGE (scale), -1);
}
gtk_scale_clear_layout (scale);
gtk_widget_queue_resize (widget);
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)
{
g_return_val_if_fail (GTK_IS_SCALE (scale), FALSE);
return scale->priv->draw_value;
}
/**
* gtk_scale_set_has_origin:
* @scale: a #GtkScale
* @has_origin: %TRUE if the scale has an origin
*
* If @has_origin is set to %TRUE (the default),
* the scale will highlight the part of the scale
* between the origin (bottom or left side) of the scale
* and the current value.
*
* Since: 3.4
*/
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.
*
* Since: 3.4
*/
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;
GtkWidget *widget;
g_return_if_fail (GTK_IS_SCALE (scale));
priv = scale->priv;
if (priv->value_pos != pos)
{
priv->value_pos = pos;
widget = GTK_WIDGET (scale);
gtk_scale_clear_layout (scale);
update_value_position (scale);
if (gtk_widget_get_visible (widget) && gtk_widget_get_mapped (widget))
gtk_widget_queue_resize (widget);
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)
{
g_return_val_if_fail (GTK_IS_SCALE (scale), 0);
return scale->priv->value_pos;
}
static void
gtk_scale_get_range_border (GtkRange *range,
GtkBorder *border)
{
GtkScalePrivate *priv;
GtkScale *scale;
scale = GTK_SCALE (range);
priv = scale->priv;
border->left = 0;
border->right = 0;
border->top = 0;
border->bottom = 0;
if (priv->value_gadget)
{
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_css_gadget_get_preferred_size (priv->value_gadget,
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;
}
}
if (gtk_orientable_get_orientation (GTK_ORIENTABLE (range)) == GTK_ORIENTATION_HORIZONTAL)
{
int height;
if (priv->top_marks_gadget)
{
gtk_css_gadget_get_preferred_size (priv->top_marks_gadget,
GTK_ORIENTATION_VERTICAL, -1,
&height, NULL,
NULL, NULL);
if (height > 0)
border->top += height;
}
if (priv->bottom_marks_gadget)
{
gtk_css_gadget_get_preferred_size (priv->bottom_marks_gadget,
GTK_ORIENTATION_VERTICAL, -1,
&height, NULL,
NULL, NULL);
if (height > 0)
border->bottom += height;
}
}
else
{
int width;
if (priv->top_marks_gadget)
{
gtk_css_gadget_get_preferred_size (priv->top_marks_gadget,
GTK_ORIENTATION_HORIZONTAL, -1,
&width, NULL,
NULL, NULL);
if (width > 0)
border->left += width;
}
if (priv->bottom_marks_gadget)
{
gtk_css_gadget_get_preferred_size (priv->bottom_marks_gadget,
GTK_ORIENTATION_HORIZONTAL, -1,
&width, NULL,
NULL, NULL);
if (width > 0)
border->right += width;
}
}
}
static void
gtk_scale_style_updated (GtkWidget *widget)
{
gtk_scale_clear_layout (GTK_SCALE (widget));
GTK_WIDGET_CLASS (gtk_scale_parent_class)->style_updated (widget);
}
static void
gtk_scale_screen_changed (GtkWidget *widget,
GdkScreen *old_screen)
{
gtk_scale_clear_layout (GTK_SCALE (widget));
}
static void
gtk_scale_measure_mark_label (GtkCssGadget *gadget,
GtkOrientation orientation,
gint for_size,
gint *minimum,
gint *natural,
gint *minimum_baseline,
gint *natural_baseline,
gpointer user_data)
{
GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
GtkScaleMark *mark = user_data;
PangoRectangle logical_rect;
*minimum = *natural = 0;
if (!mark->layout)
{
mark->layout = gtk_widget_create_pango_layout (widget, NULL);
pango_layout_set_markup (mark->layout, mark->markup, -1);
}
pango_layout_get_pixel_extents (mark->layout, NULL, &logical_rect);
if (orientation == GTK_ORIENTATION_HORIZONTAL)
*minimum = *natural = logical_rect.width;
else
*minimum = *natural = logical_rect.height;
}
static void
gtk_scale_measure_mark (GtkCssGadget *gadget,
GtkOrientation orientation,
gint for_size,
gint *minimum,
gint *natural,
gint *minimum_baseline,
gint *natural_baseline,
gpointer user_data)
{
GtkScaleMark *mark = user_data;
gtk_css_gadget_get_preferred_size (mark->indicator_gadget,
orientation, -1,
minimum, natural,
NULL, NULL);
if (mark->label_gadget)
{
int label_min, label_nat;
gtk_css_gadget_get_preferred_size (mark->label_gadget,
orientation, -1,
&label_min, &label_nat,
NULL, NULL);
*minimum += label_min;
*natural += label_nat;
}
}
static void
gtk_scale_measure_marks (GtkCssGadget *gadget,
GtkOrientation orientation,
gint for_size,
gint *minimum,
gint *natural,
gint *minimum_baseline,
gint *natural_baseline,
gpointer user_data)
{
GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
GtkScale *scale = GTK_SCALE (widget);
GtkScalePrivate *priv = scale->priv;
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 && gadget == priv->bottom_marks_gadget) ||
(mark->position == GTK_POS_BOTTOM && gadget == priv->top_marks_gadget))
continue;
gtk_css_gadget_get_preferred_size (mark->gadget,
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_get_preferred_width (GtkWidget *widget,
gint *minimum,
gint *natural)
{
GtkScale *scale = GTK_SCALE (widget);
GtkScalePrivate *priv = scale->priv;
GTK_WIDGET_CLASS (gtk_scale_parent_class)->get_preferred_width (widget, minimum, natural);
if (gtk_orientable_get_orientation (GTK_ORIENTABLE (widget)) == GTK_ORIENTATION_HORIZONTAL)
{
int top_marks_width = 0, bottom_marks_width = 0, marks_width;
if (priv->top_marks_gadget)
gtk_css_gadget_get_preferred_size (priv->top_marks_gadget,
GTK_ORIENTATION_HORIZONTAL, -1,
&top_marks_width, NULL,
NULL, NULL);
if (priv->bottom_marks_gadget)
gtk_css_gadget_get_preferred_size (priv->bottom_marks_gadget,
GTK_ORIENTATION_HORIZONTAL, -1,
&bottom_marks_width, NULL,
NULL, NULL);
marks_width = MAX (top_marks_width, bottom_marks_width);
*minimum = MAX (*minimum, marks_width);
*natural = MAX (*natural, marks_width);
}
}
static void
gtk_scale_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural)
{
GtkScale *scale = GTK_SCALE (widget);
GtkScalePrivate *priv = scale->priv;
GTK_WIDGET_CLASS (gtk_scale_parent_class)->get_preferred_height (widget, minimum, natural);
if (gtk_orientable_get_orientation (GTK_ORIENTABLE (widget)) == GTK_ORIENTATION_VERTICAL)
{
int top_marks_height = 0, bottom_marks_height = 0, marks_height;
if (priv->top_marks_gadget)
gtk_css_gadget_get_preferred_size (priv->top_marks_gadget,
GTK_ORIENTATION_VERTICAL, -1,
&top_marks_height, NULL,
NULL, NULL);
if (priv->bottom_marks_gadget)
gtk_css_gadget_get_preferred_size (priv->bottom_marks_gadget,
GTK_ORIENTATION_VERTICAL, -1,
&bottom_marks_height, NULL,
NULL, NULL);
marks_height = MAX (top_marks_height, bottom_marks_height);
*minimum = MAX (*minimum, marks_height);
*natural = MAX (*natural, marks_height);
}
}
static gboolean
gtk_scale_render_mark_indicator (GtkCssGadget *gadget,
cairo_t *cr,
int x,
int y,
int width,
int height,
gpointer user_data)
{
GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
GtkStyleContext *context;
GtkOrientation orientation;
orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (widget));
context = gtk_widget_get_style_context (widget);
gtk_style_context_save_to_node (context, gtk_css_gadget_get_node (gadget));
if (orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_render_line (context, cr,
x + width / 2, y,
x + width / 2, y + height);
else
gtk_render_line (context, cr,
x, y + height / 2,
x + width, y + height / 2);
gtk_style_context_restore (context);
return FALSE;
}
static gboolean
gtk_scale_render_mark_label (GtkCssGadget *gadget,
cairo_t *cr,
int x,
int y,
int width,
int height,
gpointer user_data)
{
GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
GtkScaleMark *mark = user_data;
GtkStyleContext *context;
context = gtk_widget_get_style_context (widget);
gtk_style_context_save_to_node (context, gtk_css_gadget_get_node (gadget));
gtk_render_layout (context, cr, x, y, mark->layout);
gtk_style_context_restore (context);
return FALSE;
}
static gboolean
gtk_scale_render_mark (GtkCssGadget *gadget,
cairo_t *cr,
int x,
int y,
int width,
int height,
gpointer user_data)
{
GtkScaleMark *mark = user_data;
gtk_css_gadget_draw (mark->indicator_gadget, cr);
if (mark->label_gadget)
gtk_css_gadget_draw (mark->label_gadget, cr);
return FALSE;
}
static gboolean
gtk_scale_render_marks (GtkCssGadget *gadget,
cairo_t *cr,
int x,
int y,
int width,
int height,
gpointer user_data)
{
GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
GtkScale *scale = GTK_SCALE (widget);
GtkScalePrivate *priv = scale->priv;
GSList *m;
for (m = priv->marks; m; m = m->next)
{
GtkScaleMark *mark = m->data;
if ((mark->position == GTK_POS_TOP && gadget == priv->bottom_marks_gadget) ||
(mark->position == GTK_POS_BOTTOM && gadget == priv->top_marks_gadget))
continue;
gtk_css_gadget_draw (mark->gadget, cr);
}
return FALSE;
}
static gboolean
gtk_scale_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkScale *scale = GTK_SCALE (widget);
GtkScalePrivate *priv = scale->priv;
if (priv->top_marks_gadget)
gtk_css_gadget_draw (priv->top_marks_gadget, cr);
if (priv->bottom_marks_gadget)
gtk_css_gadget_draw (priv->bottom_marks_gadget, cr);
GTK_WIDGET_CLASS (gtk_scale_parent_class)->draw (widget, cr);
if (priv->value_gadget)
gtk_css_gadget_draw (priv->value_gadget, cr);
return FALSE;
}
static void
gtk_scale_real_get_layout_offsets (GtkScale *scale,
gint *x,
gint *y)
{
GtkScalePrivate *priv = scale->priv;
GtkAllocation value_alloc;
if (!priv->value_gadget)
{
*x = 0;
*y = 0;
return;
}
gtk_css_gadget_get_content_allocation (priv->value_gadget, &value_alloc, NULL);
*x = value_alloc.x;
*y = value_alloc.y;
}
/*
* Emits #GtkScale::format-value signal to format the value,
* if no user signal handlers, falls back to a default format.
*
* Returns: formatted value
*/
static gchar *
gtk_scale_format_value (GtkScale *scale,
gdouble value)
{
gchar *fmt = NULL;
g_signal_emit (scale, signals[FORMAT_VALUE], 0, value, &fmt);
if (fmt)
return fmt;
else
return g_strdup_printf ("%0.*f", scale->priv->digits, value);
}
static void
gtk_scale_finalize (GObject *object)
{
GtkScale *scale = GTK_SCALE (object);
GtkScalePrivate *priv = scale->priv;
gtk_scale_clear_layout (scale);
gtk_scale_clear_marks (scale);
if (priv->value_gadget)
gtk_css_node_set_parent (gtk_css_gadget_get_node (priv->value_gadget), NULL);
g_clear_object (&priv->value_gadget);
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.
*
* Since: 2.4
*/
PangoLayout *
gtk_scale_get_layout (GtkScale *scale)
{
GtkScalePrivate *priv;
gchar *txt;
g_return_val_if_fail (GTK_IS_SCALE (scale), NULL);
priv = scale->priv;
if (!priv->layout)
{
int min_layout_width;
if (priv->draw_value)
priv->layout = gtk_widget_create_pango_layout (GTK_WIDGET (scale), NULL);
gtk_css_gadget_get_preferred_size (priv->value_gadget,
GTK_ORIENTATION_HORIZONTAL, -1,
&min_layout_width, NULL,
NULL, NULL);
pango_layout_set_width (priv->layout, min_layout_width * PANGO_SCALE);
if (priv->value_pos == GTK_POS_LEFT)
pango_layout_set_alignment (priv->layout, PANGO_ALIGN_RIGHT);
else if (priv->value_pos == GTK_POS_RIGHT)
pango_layout_set_alignment (priv->layout, PANGO_ALIGN_LEFT);
else
pango_layout_set_alignment (priv->layout, PANGO_ALIGN_CENTER);
}
if (priv->draw_value)
{
txt = gtk_scale_format_value (scale,
gtk_adjustment_get_value (gtk_range_get_adjustment (GTK_RANGE (scale))));
pango_layout_set_text (priv->layout, txt, -1);
g_free (txt);
}
return priv->layout;
}
/**
* 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.
*
* Since: 2.4
*/
void
gtk_scale_get_layout_offsets (GtkScale *scale,
gint *x,
gint *y)
{
gint local_x = 0;
gint 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_clear_layout (GtkScale *scale)
{
g_set_object (&scale->priv->layout, NULL);
}
static void
gtk_scale_mark_free (gpointer data)
{
GtkScaleMark *mark = data;
if (mark->label_gadget)
gtk_css_node_set_parent (gtk_css_gadget_get_node (mark->label_gadget), NULL);
g_clear_object (&mark->label_gadget);
gtk_css_node_set_parent (gtk_css_gadget_get_node (mark->indicator_gadget), NULL);
g_object_unref (mark->indicator_gadget);
gtk_css_node_set_parent (gtk_css_gadget_get_node (mark->gadget), NULL);
g_object_unref (mark->gadget);
g_clear_object (&mark->layout);
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().
*
* Since: 2.16
*/
void
gtk_scale_clear_marks (GtkScale *scale)
{
GtkScalePrivate *priv;
g_return_if_fail (GTK_IS_SCALE (scale));
priv = scale->priv;
g_slist_free_full (priv->marks, gtk_scale_mark_free);
priv->marks = NULL;
if (priv->top_marks_gadget)
gtk_css_node_set_parent (gtk_css_gadget_get_node (priv->top_marks_gadget), NULL);
g_clear_object (&priv->top_marks_gadget);
if (priv->bottom_marks_gadget)
gtk_css_node_set_parent (gtk_css_gadget_get_node (priv->bottom_marks_gadget), NULL);
g_clear_object (&priv->bottom_marks_gadget);
_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().
*
* Since: 2.16
*/
void
gtk_scale_add_mark (GtkScale *scale,
gdouble value,
GtkPositionType position,
const gchar *markup)
{
GtkWidget *widget;
GtkScalePrivate *priv;
GtkScaleMark *mark;
GSList *m;
gdouble *values;
gint n, i;
GtkCssNode *widget_node, *marks_node;
g_return_if_fail (GTK_IS_SCALE (scale));
priv = scale->priv;
widget = GTK_WIDGET (scale);
widget_node = gtk_widget_get_css_node (widget);
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_gadget)
{
priv->top_marks_gadget =
gtk_css_custom_gadget_new ("marks",
widget, NULL, NULL,
gtk_scale_measure_marks,
gtk_scale_allocate_marks,
gtk_scale_render_marks,
NULL, NULL);
gtk_css_node_insert_after (widget_node,
gtk_css_gadget_get_node (priv->top_marks_gadget),
(priv->value_gadget &&
(priv->value_pos == GTK_POS_TOP || priv->value_pos == GTK_POS_LEFT)) ?
gtk_css_gadget_get_node (priv->value_gadget) : NULL);
gtk_css_gadget_add_class (priv->top_marks_gadget, GTK_STYLE_CLASS_TOP);
gtk_css_gadget_set_state (priv->top_marks_gadget, gtk_css_node_get_state (widget_node));
}
marks_node = gtk_css_gadget_get_node (priv->top_marks_gadget);
}
else
{
if (!priv->bottom_marks_gadget)
{
priv->bottom_marks_gadget =
gtk_css_custom_gadget_new ("marks",
widget, NULL, NULL,
gtk_scale_measure_marks,
gtk_scale_allocate_marks,
gtk_scale_render_marks,
NULL, NULL);
gtk_css_node_insert_before (widget_node,
gtk_css_gadget_get_node (priv->bottom_marks_gadget),
(priv->value_gadget &&
(priv->value_pos == GTK_POS_BOTTOM || priv->value_pos == GTK_POS_RIGHT)) ?
gtk_css_gadget_get_node (priv->value_gadget) : NULL);
gtk_css_gadget_add_class (priv->bottom_marks_gadget, GTK_STYLE_CLASS_BOTTOM);
gtk_css_gadget_set_state (priv->bottom_marks_gadget, gtk_css_node_get_state (widget_node));
}
marks_node = gtk_css_gadget_get_node (priv->bottom_marks_gadget);
}
mark->gadget =
gtk_css_custom_gadget_new ("mark",
widget, NULL, NULL,
gtk_scale_measure_mark,
gtk_scale_allocate_mark,
gtk_scale_render_mark,
mark, NULL);
gtk_css_gadget_set_state (mark->gadget, gtk_css_node_get_state (marks_node));
mark->indicator_gadget =
gtk_css_custom_gadget_new ("indicator",
widget, mark->gadget, NULL,
NULL,
NULL,
gtk_scale_render_mark_indicator,
mark, NULL);
if (mark->markup && *mark->markup)
mark->label_gadget =
gtk_css_custom_gadget_new ("label",
widget, mark->gadget,
mark->position == GTK_POS_TOP ?
NULL : mark->indicator_gadget,
gtk_scale_measure_mark_label,
NULL,
gtk_scale_render_mark_label,
mark, 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_css_node_insert_before (marks_node,
gtk_css_gadget_get_node (mark->gadget),
gtk_css_gadget_get_node (next->gadget));
}
else
{
gtk_css_node_set_parent (gtk_css_gadget_get_node (mark->gadget), marks_node);
}
n = g_slist_length (priv->marks);
values = g_new (gdouble, 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);
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
{
gdouble value;
GtkPositionType position;
GString *markup;
gchar *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 (GMarkupParseContext *context,
const gchar *element_name,
const gchar **names,
const gchar **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 gchar *value_str;
gdouble value = 0;
const gchar *position_str = NULL;
GtkPositionType position = GTK_POS_BOTTOM;
const gchar *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 (GMarkupParseContext *context,
const gchar *text,
gsize text_len,
gpointer user_data,
GError **error)
{
MarksSubparserData *data = (MarksSubparserData*)user_data;
if (strcmp (g_markup_parse_context_get_element (context), "mark") == 0)
{
MarkData *mark = data->marks->data;
g_string_append_len (mark->markup, text, text_len);
}
}
static const GMarkupParser marks_parser =
{
marks_start_element,
NULL,
marks_text,
};
static gboolean
gtk_scale_buildable_custom_tag_start (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *tagname,
GMarkupParser *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 gchar *tagname,
gpointer user_data)
{
GtkScale *scale = GTK_SCALE (buildable);
MarksSubparserData *marks_data;
if (strcmp (tagname, "marks") == 0)
{
GSList *m;
const gchar *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);
}
}
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