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gtk2/gtk/gtkscale.c
Timm Bäder 985121813e scale: Fix value height calculation 
if (orientation) doesn't make a lot of sense but C doesn't complain and
instead evaluates orientation to TRUE for GTK_ORIENTATION_VERTICAL
(since that's 1), thus inverting the value sizes.
2016-03-16 10:20:17 +01:00

2397 lines
76 KiB
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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;
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);
min_pos_before = min_pos_after = 0;
gtk_widget_get_allocation (widget, &widget_alloc);
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: (allow-none) (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;
*minimum = *natural = 0;
if (mark->markup)
{
PangoLayout *layout;
PangoRectangle logical_rect;
layout = gtk_widget_create_pango_layout (widget, NULL);
pango_layout_set_markup (layout, mark->markup, -1);
pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
if (orientation == GTK_ORIENTATION_HORIZONTAL)
*minimum = *natural = logical_rect.width;
else
*minimum = *natural = logical_rect.height;
g_object_unref (layout);
}
}
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;
PangoLayout *layout;
context = gtk_widget_get_style_context (widget);
gtk_style_context_save_to_node (context, gtk_css_gadget_get_node (gadget));
layout = gtk_widget_create_pango_layout (widget, NULL);
pango_layout_set_markup (layout, mark->markup, -1);
gtk_render_layout (context, cr, x, y, layout);
gtk_style_context_restore (context);
g_object_unref (layout);
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)
{
if (priv->draw_value)
priv->layout = gtk_widget_create_pango_layout (GTK_WIDGET (scale), NULL);
}
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_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 ? 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 ? 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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