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gtk2/gtk/gtklevelbar.c
Matthias Clasen abf8cbeaea a11y: Set an accessible role for GtkLevelBar 
Use the 'meter' role for GtkLevelBar, and set the
appropriate properties.

Update the docs and add a test.
2020-07-29 22:46:00 -04:00

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/* GTK - The GIMP Toolkit
* Copyright © 2012 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/>.
*
* Author: Cosimo Cecchi <cosimoc@gnome.org>
*
*/
/**
* SECTION:gtklevelbar
* @Title: GtkLevelBar
* @Short_description: A bar that can used as a level indicator
*
* The #GtkLevelBar is a bar widget that can be used
* as a level indicator. Typical use cases are displaying the strength
* of a password, or showing the charge level of a battery.
*
* Use gtk_level_bar_set_value() to set the current value, and
* gtk_level_bar_add_offset_value() to set the value offsets at which
* the bar will be considered in a different state. GTK will add a few
* offsets by default on the level bar: #GTK_LEVEL_BAR_OFFSET_LOW,
* #GTK_LEVEL_BAR_OFFSET_HIGH and #GTK_LEVEL_BAR_OFFSET_FULL, with
* values 0.25, 0.75 and 1.0 respectively.
*
* Note that it is your responsibility to update preexisting offsets
* when changing the minimum or maximum value. GTK+ will simply clamp
* them to the new range.
*
* ## Adding a custom offset on the bar
*
* |[<!-- language="C" -->
*
* static GtkWidget *
* create_level_bar (void)
* {
* GtkWidget *widget;
* GtkLevelBar *bar;
*
* widget = gtk_level_bar_new ();
* bar = GTK_LEVEL_BAR (widget);
*
* // This changes the value of the default low offset
*
* gtk_level_bar_add_offset_value (bar,
* GTK_LEVEL_BAR_OFFSET_LOW,
* 0.10);
*
* // This adds a new offset to the bar; the application will
* // be able to change its color CSS like this:
* //
* // levelbar block.my-offset {
* // background-color: magenta;
* // border-style: solid;
* // border-color: black;
* // border-style: 1px;
* // }
*
* gtk_level_bar_add_offset_value (bar, "my-offset", 0.60);
*
* return widget;
* }
* ]|
*
* The default interval of values is between zero and one, but it’s possible to
* modify the interval using gtk_level_bar_set_min_value() and
* gtk_level_bar_set_max_value(). The value will be always drawn in proportion to
* the admissible interval, i.e. a value of 15 with a specified interval between
* 10 and 20 is equivalent to a value of 0.5 with an interval between 0 and 1.
* When #GTK_LEVEL_BAR_MODE_DISCRETE is used, the bar level is rendered
* as a finite number of separated blocks instead of a single one. The number
* of blocks that will be rendered is equal to the number of units specified by
* the admissible interval.
*
* For instance, to build a bar rendered with five blocks, it’s sufficient to
* set the minimum value to 0 and the maximum value to 5 after changing the indicator
* mode to discrete.
*
* GtkLevelBar was introduced in GTK+ 3.6.
*
* # GtkLevelBar as GtkBuildable
*
* The GtkLevelBar implementation of the GtkBuildable interface supports a
* custom <offsets> element, which can contain any number of <offset> elements,
* each of which must have name and value attributes.
*
* # CSS nodes
*
* |[<!-- language="plain" -->
* levelbar[.discrete]
* ╰── trough
* ├── block.filled.level-name
* ┊
* ├── block.empty
* ┊
* ]|
*
* GtkLevelBar has a main CSS node with name levelbar and one of the style
* classes .discrete or .continuous and a subnode with name trough. Below the
* trough node are a number of nodes with name block and style class .filled
* or .empty. In continuous mode, there is exactly one node of each, in discrete
* mode, the number of filled and unfilled nodes corresponds to blocks that are
* drawn. The block.filled nodes also get a style class .level-name corresponding
* to the level for the current value.
*
* In horizontal orientation, the nodes are always arranged from left to right,
* regardless of text direction.
*
* # Accessibility
*
* GtkLevelBar uses the #GTK_ACCESSIBLE_ROLE_METER role.
*/
#include "config.h"
#include "gtkbinlayout.h"
#include "gtkbuildable.h"
#include "gtkbuilderprivate.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkcssnodeprivate.h"
#include "gtkgizmoprivate.h"
#include "gtkintl.h"
#include "gtklevelbar.h"
#include "gtkmarshalers.h"
#include "gtkorientable.h"
#include "gtkstylecontextprivate.h"
#include "gtktypebuiltins.h"
#include "gtkwidgetprivate.h"
#include <math.h>
#include <stdlib.h>
enum {
PROP_VALUE = 1,
PROP_MIN_VALUE,
PROP_MAX_VALUE,
PROP_MODE,
PROP_INVERTED,
LAST_PROPERTY,
PROP_ORIENTATION /* overridden */
};
enum {
SIGNAL_OFFSET_CHANGED,
NUM_SIGNALS
};
static GParamSpec *properties[LAST_PROPERTY] = { NULL, };
static guint signals[NUM_SIGNALS] = { 0, };
typedef struct _GtkLevelBarClass GtkLevelBarClass;
typedef struct {
char *name;
double value;
} GtkLevelBarOffset;
struct _GtkLevelBar {
GtkWidget parent_instance;
GtkOrientation orientation;
GtkLevelBarMode bar_mode;
double min_value;
double max_value;
double cur_value;
GList *offsets;
GtkWidget *trough_widget;
GtkWidget **block_widget;
guint n_blocks;
guint inverted : 1;
};
struct _GtkLevelBarClass {
GtkWidgetClass parent_class;
void (* offset_changed) (GtkLevelBar *self,
const char *name);
};
static void gtk_level_bar_set_value_internal (GtkLevelBar *self,
double value);
static void gtk_level_bar_buildable_init (GtkBuildableIface *iface);
G_DEFINE_TYPE_WITH_CODE (GtkLevelBar, gtk_level_bar, GTK_TYPE_WIDGET,
G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL)
G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
gtk_level_bar_buildable_init))
static GtkLevelBarOffset *
gtk_level_bar_offset_new (const char *name,
double value)
{
GtkLevelBarOffset *offset = g_slice_new0 (GtkLevelBarOffset);
offset->name = g_strdup (name);
offset->value = value;
return offset;
}
static void
gtk_level_bar_offset_free (GtkLevelBarOffset *offset)
{
g_free (offset->name);
g_slice_free (GtkLevelBarOffset, offset);
}
static int
offset_find_func (gconstpointer data,
gconstpointer user_data)
{
const GtkLevelBarOffset *offset = data;
const char *name = user_data;
return g_strcmp0 (name, offset->name);
}
static int
offset_sort_func (gconstpointer a,
gconstpointer b)
{
const GtkLevelBarOffset *offset_a = a;
const GtkLevelBarOffset *offset_b = b;
return (offset_a->value > offset_b->value);
}
static gboolean
gtk_level_bar_ensure_offset (GtkLevelBar *self,
const char *name,
double value)
{
GList *existing;
GtkLevelBarOffset *offset = NULL;
GtkLevelBarOffset *new_offset;
existing = g_list_find_custom (self->offsets, name, offset_find_func);
if (existing)
offset = existing->data;
if (offset && (offset->value == value))
return FALSE;
new_offset = gtk_level_bar_offset_new (name, value);
if (offset)
{
gtk_level_bar_offset_free (offset);
self->offsets = g_list_delete_link (self->offsets, existing);
}
self->offsets = g_list_insert_sorted (self->offsets, new_offset, offset_sort_func);
return TRUE;
}
#ifndef G_DISABLE_CHECKS
static gboolean
gtk_level_bar_value_in_interval (GtkLevelBar *self,
double value)
{
return ((value >= self->min_value) &&
(value <= self->max_value));
}
#endif
static int
gtk_level_bar_get_num_blocks (GtkLevelBar *self)
{
if (self->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
return 1;
else if (self->bar_mode == GTK_LEVEL_BAR_MODE_DISCRETE)
return MAX (1, (int) (round (self->max_value) - round (self->min_value)));
return 0;
}
static int
gtk_level_bar_get_num_block_nodes (GtkLevelBar *self)
{
if (self->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
return 2;
else
return gtk_level_bar_get_num_blocks (self);
}
static void
gtk_level_bar_get_min_block_size (GtkLevelBar *self,
int *block_width,
int *block_height)
{
guint i, n_blocks;
int width, height;
*block_width = *block_height = 0;
n_blocks = gtk_level_bar_get_num_block_nodes (self);
for (i = 0; i < n_blocks; i++)
{
gtk_widget_measure (self->block_widget[i],
GTK_ORIENTATION_HORIZONTAL,
-1,
&width, NULL,
NULL, NULL);
gtk_widget_measure (self->block_widget[i],
GTK_ORIENTATION_VERTICAL,
-1,
&height, NULL,
NULL, NULL);
*block_width = MAX (width, *block_width);
*block_height = MAX (height, *block_height);
}
}
static gboolean
gtk_level_bar_get_real_inverted (GtkLevelBar *self)
{
if (gtk_widget_get_direction (GTK_WIDGET (self)) == GTK_TEXT_DIR_RTL &&
self->orientation == GTK_ORIENTATION_HORIZONTAL)
return !self->inverted;
return self->inverted;
}
static void
gtk_level_bar_render_trough (GtkGizmo *gizmo,
GtkSnapshot *snapshot)
{
GtkWidget *widget = GTK_WIDGET (gizmo);
GtkLevelBar *self = GTK_LEVEL_BAR (gtk_widget_get_parent (GTK_WIDGET (gizmo)));
if (self->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
{
gboolean inverted;
inverted = gtk_level_bar_get_real_inverted (self);
/* render the empty (unfilled) part */
gtk_widget_snapshot_child (widget, self->block_widget[inverted ? 0 : 1], snapshot);
/* now render the filled part on top of it */
if (self->cur_value != 0)
gtk_widget_snapshot_child (widget, self->block_widget[inverted ? 1 : 0], snapshot);
}
else
{
int num_blocks, i;
num_blocks = gtk_level_bar_get_num_blocks (self);
for (i = 0; i < num_blocks; i++)
gtk_widget_snapshot_child (widget, self->block_widget[i], snapshot);
}
}
static void
gtk_level_bar_measure_trough (GtkGizmo *gizmo,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkWidget *widget = GTK_WIDGET (gizmo);
GtkLevelBar *self = GTK_LEVEL_BAR (gtk_widget_get_parent (widget));
int num_blocks, size;
int block_width, block_height;
num_blocks = gtk_level_bar_get_num_blocks (self);
gtk_level_bar_get_min_block_size (self, &block_width, &block_height);
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
if (self->orientation == GTK_ORIENTATION_HORIZONTAL)
size = num_blocks * block_width;
else
size = block_width;
}
else
{
if (self->orientation == GTK_ORIENTATION_VERTICAL)
size = num_blocks * block_height;
else
size = block_height;
}
*minimum = size;
*natural = size;
}
static void
gtk_level_bar_allocate_trough_continuous (GtkLevelBar *self,
int width,
int height,
int baseline)
{
GtkAllocation block_area;
double fill_percentage;
gboolean inverted;
int block_min;
inverted = gtk_level_bar_get_real_inverted (self);
/* allocate the empty (unfilled) part */
gtk_widget_size_allocate (self->block_widget[inverted ? 0 : 1],
&(GtkAllocation) {0, 0, width, height},
baseline);
if (self->cur_value == 0)
return;
/* now allocate the filled part */
block_area = (GtkAllocation) {0, 0, width, height};
fill_percentage = (self->cur_value - self->min_value) /
(self->max_value - self->min_value);
gtk_widget_measure (self->block_widget[inverted ? 1 : 0],
self->orientation, -1,
&block_min, NULL,
NULL, NULL);
if (self->orientation == GTK_ORIENTATION_HORIZONTAL)
{
block_area.width = (int) floor (block_area.width * fill_percentage);
block_area.width = MAX (block_area.width, block_min);
if (inverted)
block_area.x += width - block_area.width;
}
else
{
block_area.height = (int) floor (block_area.height * fill_percentage);
block_area.height = MAX (block_area.height, block_min);
if (inverted)
block_area.y += height - block_area.height;
}
gtk_widget_size_allocate (self->block_widget[inverted ? 1 : 0],
&block_area,
baseline);
}
static void
gtk_level_bar_allocate_trough_discrete (GtkLevelBar *self,
int width,
int height,
int baseline)
{
GtkAllocation block_area;
int num_blocks, i;
int block_width, block_height;
gtk_level_bar_get_min_block_size (self, &block_width, &block_height);
num_blocks = gtk_level_bar_get_num_blocks (self);
if (num_blocks == 0)
return;
if (self->orientation == GTK_ORIENTATION_HORIZONTAL)
{
block_width = MAX (block_width, (int) floor (width / num_blocks));
block_height = height;
}
else
{
block_width = width;
block_height = MAX (block_height, (int) floor (height / num_blocks));
}
block_area.x = 0;
block_area.y = 0;
block_area.width = block_width;
block_area.height = block_height;
for (i = 0; i < num_blocks; i++)
{
gtk_widget_size_allocate (self->block_widget[i],
&block_area,
baseline);
if (self->orientation == GTK_ORIENTATION_HORIZONTAL)
block_area.x += block_area.width;
else
block_area.y += block_area.height;
}
}
static void
gtk_level_bar_allocate_trough (GtkGizmo *gizmo,
int width,
int height,
int baseline)
{
GtkWidget *widget = GTK_WIDGET (gizmo);
GtkLevelBar *self = GTK_LEVEL_BAR (gtk_widget_get_parent (widget));
if (self->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
gtk_level_bar_allocate_trough_continuous (self, width, height, baseline);
else
gtk_level_bar_allocate_trough_discrete (self, width, height, baseline);
}
static void
update_block_nodes (GtkLevelBar *self)
{
guint n_blocks;
guint i;
n_blocks = gtk_level_bar_get_num_block_nodes (self);
if (self->n_blocks == n_blocks)
return;
else if (n_blocks < self->n_blocks)
{
for (i = n_blocks; i < self->n_blocks; i++)
{
gtk_widget_unparent (self->block_widget[i]);
}
self->block_widget = g_renew (GtkWidget*, self->block_widget, n_blocks);
self->n_blocks = n_blocks;
}
else
{
self->block_widget = g_renew (GtkWidget*, self->block_widget, n_blocks);
for (i = self->n_blocks; i < n_blocks; i++)
{
self->block_widget[i] = gtk_gizmo_new ("block", NULL, NULL, NULL, NULL, NULL, NULL);
gtk_widget_insert_before (self->block_widget[i], GTK_WIDGET (self->trough_widget), NULL);
}
self->n_blocks = n_blocks;
}
}
static void
update_mode_style_classes (GtkLevelBar *self)
{
GtkCssNode *widget_node;
widget_node = gtk_widget_get_css_node (GTK_WIDGET (self));
if (self->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
{
gtk_css_node_remove_class (widget_node, g_quark_from_static_string ("discrete"));
gtk_css_node_add_class (widget_node, g_quark_from_static_string ("continuous"));
}
else if (self->bar_mode == GTK_LEVEL_BAR_MODE_DISCRETE)
{
gtk_css_node_add_class (widget_node, g_quark_from_static_string ("discrete"));
gtk_css_node_remove_class (widget_node, g_quark_from_static_string ("continuous"));
}
}
static void
update_level_style_classes (GtkLevelBar *self)
{
double value;
const char *value_class = NULL;
GtkLevelBarOffset *offset, *prev_offset;
GList *l;
int num_filled, num_blocks, i;
gboolean inverted;
value = gtk_level_bar_get_value (self);
for (l = self->offsets; l != NULL; l = l->next)
{
offset = l->data;
/* find the right offset for our style class */
if (value <= offset->value)
{
if (l->prev == NULL)
{
value_class = offset->name;
}
else
{
prev_offset = l->prev->data;
if (prev_offset->value < value)
value_class = offset->name;
}
}
if (value_class)
break;
}
inverted = gtk_level_bar_get_real_inverted (self);
num_blocks = gtk_level_bar_get_num_block_nodes (self);
if (self->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
num_filled = 1;
else
num_filled = MIN (num_blocks, (int) round (self->cur_value) - (int) round (self->min_value));
for (i = 0; i < num_filled; i++)
{
GtkCssNode *node = gtk_widget_get_css_node (self->block_widget[inverted ? num_blocks - 1 - i : i]);
gtk_css_node_set_classes (node, NULL);
gtk_css_node_add_class (node, g_quark_from_static_string ("filled"));
if (value_class)
gtk_css_node_add_class (node, g_quark_from_string (value_class));
}
for (; i < num_blocks; i++)
{
GtkCssNode *node = gtk_widget_get_css_node (self->block_widget[inverted ? num_blocks - 1 - i : i]);
gtk_css_node_set_classes (node, NULL);
gtk_css_node_add_class (node, g_quark_from_static_string ("empty"));
}
}
static void
gtk_level_bar_direction_changed (GtkWidget *widget,
GtkTextDirection previous_dir)
{
GtkLevelBar *self = GTK_LEVEL_BAR (widget);
update_level_style_classes (self);
GTK_WIDGET_CLASS (gtk_level_bar_parent_class)->direction_changed (widget, previous_dir);
}
static void
gtk_level_bar_ensure_offsets_in_range (GtkLevelBar *self)
{
GtkLevelBarOffset *offset;
GList *l = self->offsets;
while (l != NULL)
{
offset = l->data;
l = l->next;
if (offset->value < self->min_value)
gtk_level_bar_ensure_offset (self, offset->name, self->min_value);
else if (offset->value > self->max_value)
gtk_level_bar_ensure_offset (self, offset->name, self->max_value);
}
}
typedef struct {
GtkLevelBar *self;
GtkBuilder *builder;
GList *offsets;
} OffsetsParserData;
static void
offset_start_element (GtkBuildableParseContext *context,
const char *element_name,
const char **names,
const char **values,
gpointer user_data,
GError **error)
{
OffsetsParserData *data = user_data;
if (strcmp (element_name, "offsets") == 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, "offset") == 0)
{
const char *name;
const char *value;
GValue gvalue = G_VALUE_INIT;
GtkLevelBarOffset *offset;
if (!_gtk_builder_check_parent (data->builder, context, "offsets", error))
return;
if (!g_markup_collect_attributes (element_name, names, values, error,
G_MARKUP_COLLECT_STRING, "name", &name,
G_MARKUP_COLLECT_STRING, "value", &value,
G_MARKUP_COLLECT_INVALID))
{
_gtk_builder_prefix_error (data->builder, context, error);
return;
}
if (!gtk_builder_value_from_string_type (data->builder, G_TYPE_DOUBLE, value, &gvalue, error))
{
_gtk_builder_prefix_error (data->builder, context, error);
return;
}
offset = gtk_level_bar_offset_new (name, g_value_get_double (&gvalue));
data->offsets = g_list_prepend (data->offsets, offset);
}
else
{
_gtk_builder_error_unhandled_tag (data->builder, context,
"GtkLevelBar", element_name,
error);
}
}
static const GtkBuildableParser offset_parser =
{
offset_start_element
};
static GtkBuildableIface *parent_buildable_iface;
static gboolean
gtk_level_bar_buildable_custom_tag_start (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const char *tagname,
GtkBuildableParser *parser,
gpointer *parser_data)
{
OffsetsParserData *data;
if (parent_buildable_iface->custom_tag_start (buildable, builder, child,
tagname, parser, parser_data))
return TRUE;
if (child)
return FALSE;
if (strcmp (tagname, "offsets") != 0)
return FALSE;
data = g_slice_new0 (OffsetsParserData);
data->self = GTK_LEVEL_BAR (buildable);
data->builder = builder;
data->offsets = NULL;
*parser = offset_parser;
*parser_data = data;
return TRUE;
}
static void
gtk_level_bar_buildable_custom_finished (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const char *tagname,
gpointer user_data)
{
OffsetsParserData *data = user_data;
GtkLevelBar *self;
GtkLevelBarOffset *offset;
GList *l;
self = data->self;
if (strcmp (tagname, "offsets") != 0)
{
parent_buildable_iface->custom_finished (buildable, builder, child,
tagname, user_data);
return;
}
for (l = data->offsets; l != NULL; l = l->next)
{
offset = l->data;
gtk_level_bar_add_offset_value (self, offset->name, offset->value);
}
g_list_free_full (data->offsets, (GDestroyNotify) gtk_level_bar_offset_free);
g_slice_free (OffsetsParserData, data);
}
static void
gtk_level_bar_buildable_init (GtkBuildableIface *iface)
{
parent_buildable_iface = g_type_interface_peek_parent (iface);
iface->custom_tag_start = gtk_level_bar_buildable_custom_tag_start;
iface->custom_finished = gtk_level_bar_buildable_custom_finished;
}
static void
gtk_level_bar_set_orientation (GtkLevelBar *self,
GtkOrientation orientation)
{
if (self->orientation != orientation)
{
self->orientation = orientation;
gtk_widget_update_orientation (GTK_WIDGET (self), self->orientation);
gtk_widget_queue_resize (GTK_WIDGET (self));
g_object_notify (G_OBJECT (self), "orientation");
}
}
static void
gtk_level_bar_get_property (GObject *obj,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GtkLevelBar *self = GTK_LEVEL_BAR (obj);
switch (property_id)
{
case PROP_VALUE:
g_value_set_double (value, gtk_level_bar_get_value (self));
break;
case PROP_MIN_VALUE:
g_value_set_double (value, gtk_level_bar_get_min_value (self));
break;
case PROP_MAX_VALUE:
g_value_set_double (value, gtk_level_bar_get_max_value (self));
break;
case PROP_MODE:
g_value_set_enum (value, gtk_level_bar_get_mode (self));
break;
case PROP_INVERTED:
g_value_set_boolean (value, gtk_level_bar_get_inverted (self));
break;
case PROP_ORIENTATION:
g_value_set_enum (value, self->orientation);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, property_id, pspec);
break;
}
}
static void
gtk_level_bar_set_property (GObject *obj,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GtkLevelBar *self = GTK_LEVEL_BAR (obj);
switch (property_id)
{
case PROP_VALUE:
gtk_level_bar_set_value (self, g_value_get_double (value));
break;
case PROP_MIN_VALUE:
gtk_level_bar_set_min_value (self, g_value_get_double (value));
break;
case PROP_MAX_VALUE:
gtk_level_bar_set_max_value (self, g_value_get_double (value));
break;
case PROP_MODE:
gtk_level_bar_set_mode (self, g_value_get_enum (value));
break;
case PROP_INVERTED:
gtk_level_bar_set_inverted (self, g_value_get_boolean (value));
break;
case PROP_ORIENTATION:
gtk_level_bar_set_orientation (self, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, property_id, pspec);
break;
}
}
static void
gtk_level_bar_finalize (GObject *obj)
{
GtkLevelBar *self = GTK_LEVEL_BAR (obj);
int i;
g_list_free_full (self->offsets, (GDestroyNotify) gtk_level_bar_offset_free);
for (i = 0; i < self->n_blocks; i++)
gtk_widget_unparent (self->block_widget[i]);
g_free (self->block_widget);
gtk_widget_unparent (self->trough_widget);
G_OBJECT_CLASS (gtk_level_bar_parent_class)->finalize (obj);
}
static void
gtk_level_bar_class_init (GtkLevelBarClass *klass)
{
GObjectClass *oclass = G_OBJECT_CLASS (klass);
GtkWidgetClass *wclass = GTK_WIDGET_CLASS (klass);
oclass->get_property = gtk_level_bar_get_property;
oclass->set_property = gtk_level_bar_set_property;
oclass->finalize = gtk_level_bar_finalize;
wclass->direction_changed = gtk_level_bar_direction_changed;
g_object_class_override_property (oclass, PROP_ORIENTATION, "orientation");
/**
* GtkLevelBar::offset-changed:
* @self: a #GtkLevelBar
* @name: the name of the offset that changed value
*
* Emitted when an offset specified on the bar changes value as an
* effect to gtk_level_bar_add_offset_value() being called.
*
* The signal supports detailed connections; you can connect to the
* detailed signal "changed::x" in order to only receive callbacks when
* the value of offset "x" changes.
*/
signals[SIGNAL_OFFSET_CHANGED] =
g_signal_new (I_("offset-changed"),
GTK_TYPE_LEVEL_BAR,
G_SIGNAL_RUN_FIRST | G_SIGNAL_DETAILED,
G_STRUCT_OFFSET (GtkLevelBarClass, offset_changed),
NULL, NULL,
NULL,
G_TYPE_NONE,
1, G_TYPE_STRING);
/**
* GtkLevelBar:value:
*
* The #GtkLevelBar:value property determines the currently
* filled value of the level bar.
*/
properties[PROP_VALUE] =
g_param_spec_double ("value",
P_("Currently filled value level"),
P_("Currently filled value level of the level bar"),
0.0, G_MAXDOUBLE, 0.0,
G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS|G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkLevelBar:min-value:
*
* The #GtkLevelBar:min-value property determines the minimum value of
* the interval that can be displayed by the bar.
*/
properties[PROP_MIN_VALUE] =
g_param_spec_double ("min-value",
P_("Minimum value level for the bar"),
P_("Minimum value level that can be displayed by the bar"),
0.0, G_MAXDOUBLE, 0.0,
G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS|G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkLevelBar:max-value:
*
* The #GtkLevelBar:max-value property determaxes the maximum value of
* the interval that can be displayed by the bar.
*/
properties[PROP_MAX_VALUE] =
g_param_spec_double ("max-value",
P_("Maximum value level for the bar"),
P_("Maximum value level that can be displayed by the bar"),
0.0, G_MAXDOUBLE, 1.0,
G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS|G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkLevelBar:mode:
*
* The #GtkLevelBar:mode property determines the way #GtkLevelBar
* interprets the value properties to draw the level fill area.
* Specifically, when the value is #GTK_LEVEL_BAR_MODE_CONTINUOUS,
* #GtkLevelBar will draw a single block representing the current value in
* that area; when the value is #GTK_LEVEL_BAR_MODE_DISCRETE,
* the widget will draw a succession of separate blocks filling the
* draw area, with the number of blocks being equal to the units separating
* the integral roundings of #GtkLevelBar:min-value and #GtkLevelBar:max-value.
*/
properties[PROP_MODE] =
g_param_spec_enum ("mode",
P_("The mode of the value indicator"),
P_("The mode of the value indicator displayed by the bar"),
GTK_TYPE_LEVEL_BAR_MODE,
GTK_LEVEL_BAR_MODE_CONTINUOUS,
G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS|G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkLevelBar:inverted:
*
* Level bars normally grow from top to bottom or left to right.
* Inverted level bars grow in the opposite direction.
*/
properties[PROP_INVERTED] =
g_param_spec_boolean ("inverted",
P_("Inverted"),
P_("Invert the direction in which the level bar grows"),
FALSE,
G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS|G_PARAM_EXPLICIT_NOTIFY);
g_object_class_install_properties (oclass, LAST_PROPERTY, properties);
gtk_widget_class_set_layout_manager_type (wclass, GTK_TYPE_BIN_LAYOUT);
gtk_widget_class_set_css_name (wclass, I_("levelbar"));
gtk_widget_class_set_accessible_role (wclass, GTK_ACCESSIBLE_ROLE_METER);
}
static void
gtk_level_bar_init (GtkLevelBar *self)
{
self->cur_value = 0.0;
self->min_value = 0.0;
self->max_value = 1.0;
/* set initial orientation and style classes */
self->orientation = GTK_ORIENTATION_HORIZONTAL;
gtk_widget_update_orientation (GTK_WIDGET (self), self->orientation);
self->inverted = FALSE;
self->trough_widget = gtk_gizmo_new ("trough",
gtk_level_bar_measure_trough,
gtk_level_bar_allocate_trough,
gtk_level_bar_render_trough,
NULL,
NULL, NULL);
gtk_widget_set_parent (self->trough_widget, GTK_WIDGET (self));
gtk_level_bar_ensure_offset (self, GTK_LEVEL_BAR_OFFSET_LOW, 0.25);
gtk_level_bar_ensure_offset (self, GTK_LEVEL_BAR_OFFSET_HIGH, 0.75);
gtk_level_bar_ensure_offset (self, GTK_LEVEL_BAR_OFFSET_FULL, 1.0);
self->block_widget = NULL;
self->n_blocks = 0;
self->bar_mode = GTK_LEVEL_BAR_MODE_CONTINUOUS;
update_mode_style_classes (self);
update_block_nodes (self);
update_level_style_classes (self);
gtk_accessible_update_property (GTK_ACCESSIBLE (self),
GTK_ACCESSIBLE_PROPERTY_VALUE_MAX, 1.0,
GTK_ACCESSIBLE_PROPERTY_VALUE_MIN, 0.0,
GTK_ACCESSIBLE_PROPERTY_VALUE_NOW, 0.0,
-1);
}
/**
* gtk_level_bar_new:
*
* Creates a new #GtkLevelBar.
*
* Returns: a #GtkLevelBar.
*/
GtkWidget *
gtk_level_bar_new (void)
{
return g_object_new (GTK_TYPE_LEVEL_BAR, NULL);
}
/**
* gtk_level_bar_new_for_interval:
* @min_value: a positive value
* @max_value: a positive value
*
* Utility constructor that creates a new #GtkLevelBar for the specified
* interval.
*
* Returns: a #GtkLevelBar
*/
GtkWidget *
gtk_level_bar_new_for_interval (double min_value,
double max_value)
{
return g_object_new (GTK_TYPE_LEVEL_BAR,
"min-value", min_value,
"max-value", max_value,
NULL);
}
/**
* gtk_level_bar_get_min_value:
* @self: a #GtkLevelBar
*
* Returns the value of the #GtkLevelBar:min-value property.
*
* Returns: a positive value
*/
double
gtk_level_bar_get_min_value (GtkLevelBar *self)
{
g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), 0.0);
return self->min_value;
}
/**
* gtk_level_bar_get_max_value:
* @self: a #GtkLevelBar
*
* Returns the value of the #GtkLevelBar:max-value property.
*
* Returns: a positive value
*/
double
gtk_level_bar_get_max_value (GtkLevelBar *self)
{
g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), 0.0);
return self->max_value;
}
/**
* gtk_level_bar_get_value:
* @self: a #GtkLevelBar
*
* Returns the value of the #GtkLevelBar:value property.
*
* Returns: a value in the interval between
* #GtkLevelBar:min-value and #GtkLevelBar:max-value
*/
double
gtk_level_bar_get_value (GtkLevelBar *self)
{
g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), 0.0);
return self->cur_value;
}
static void
gtk_level_bar_set_value_internal (GtkLevelBar *self,
double value)
{
self->cur_value = value;
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_VALUE]);
gtk_widget_queue_allocate (GTK_WIDGET (self->trough_widget));
}
/**
* gtk_level_bar_set_min_value:
* @self: a #GtkLevelBar
* @value: a positive value
*
* Sets the value of the #GtkLevelBar:min-value property.
*
* You probably want to update preexisting level offsets after calling
* this function.
*/
void
gtk_level_bar_set_min_value (GtkLevelBar *self,
double value)
{
g_return_if_fail (GTK_IS_LEVEL_BAR (self));
g_return_if_fail (value >= 0.0);
if (value == self->min_value)
return;
self->min_value = value;
if (self->min_value > self->cur_value)
gtk_level_bar_set_value_internal (self, self->min_value);
update_block_nodes (self);
update_level_style_classes (self);
gtk_accessible_update_property (GTK_ACCESSIBLE (self),
GTK_ACCESSIBLE_PROPERTY_VALUE_MIN, self->min_value,
GTK_ACCESSIBLE_PROPERTY_VALUE_NOW, self->cur_value,
-1);
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MIN_VALUE]);
}
/**
* gtk_level_bar_set_max_value:
* @self: a #GtkLevelBar
* @value: a positive value
*
* Sets the value of the #GtkLevelBar:max-value property.
*
* You probably want to update preexisting level offsets after calling
* this function.
*/
void
gtk_level_bar_set_max_value (GtkLevelBar *self,
double value)
{
g_return_if_fail (GTK_IS_LEVEL_BAR (self));
g_return_if_fail (value >= 0.0);
if (value == self->max_value)
return;
self->max_value = value;
if (self->max_value < self->cur_value)
gtk_level_bar_set_value_internal (self, self->max_value);
gtk_level_bar_ensure_offsets_in_range (self);
update_block_nodes (self);
update_level_style_classes (self);
gtk_accessible_update_property (GTK_ACCESSIBLE (self),
GTK_ACCESSIBLE_PROPERTY_VALUE_MAX, self->max_value,
GTK_ACCESSIBLE_PROPERTY_VALUE_NOW, self->cur_value,
-1);
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MAX_VALUE]);
}
/**
* gtk_level_bar_set_value:
* @self: a #GtkLevelBar
* @value: a value in the interval between
* #GtkLevelBar:min-value and #GtkLevelBar:max-value
*
* Sets the value of the #GtkLevelBar:value property.
*/
void
gtk_level_bar_set_value (GtkLevelBar *self,
double value)
{
g_return_if_fail (GTK_IS_LEVEL_BAR (self));
if (value == self->cur_value)
return;
gtk_level_bar_set_value_internal (self, value);
update_level_style_classes (self);
gtk_accessible_update_property (GTK_ACCESSIBLE (self),
GTK_ACCESSIBLE_PROPERTY_VALUE_NOW, self->cur_value,
-1);
}
/**
* gtk_level_bar_get_mode:
* @self: a #GtkLevelBar
*
* Returns the value of the #GtkLevelBar:mode property.
*
* Returns: a #GtkLevelBarMode
*/
GtkLevelBarMode
gtk_level_bar_get_mode (GtkLevelBar *self)
{
g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), 0);
return self->bar_mode;
}
/**
* gtk_level_bar_set_mode:
* @self: a #GtkLevelBar
* @mode: a #GtkLevelBarMode
*
* Sets the value of the #GtkLevelBar:mode property.
*/
void
gtk_level_bar_set_mode (GtkLevelBar *self,
GtkLevelBarMode mode)
{
g_return_if_fail (GTK_IS_LEVEL_BAR (self));
if (self->bar_mode == mode)
return;
self->bar_mode = mode;
update_mode_style_classes (self);
update_block_nodes (self);
update_level_style_classes (self);
gtk_widget_queue_resize (GTK_WIDGET (self));
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MODE]);
}
/**
* gtk_level_bar_get_inverted:
* @self: a #GtkLevelBar
*
* Return the value of the #GtkLevelBar:inverted property.
*
* Returns: %TRUE if the level bar is inverted
*/
gboolean
gtk_level_bar_get_inverted (GtkLevelBar *self)
{
g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), FALSE);
return self->inverted;
}
/**
* gtk_level_bar_set_inverted:
* @self: a #GtkLevelBar
* @inverted: %TRUE to invert the level bar
*
* Sets the value of the #GtkLevelBar:inverted property.
*/
void
gtk_level_bar_set_inverted (GtkLevelBar *self,
gboolean inverted)
{
g_return_if_fail (GTK_IS_LEVEL_BAR (self));
if (self->inverted == inverted)
return;
self->inverted = inverted;
gtk_widget_queue_resize (GTK_WIDGET (self));
update_level_style_classes (self);
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_INVERTED]);
}
/**
* gtk_level_bar_remove_offset_value:
* @self: a #GtkLevelBar
* @name: (allow-none): the name of an offset in the bar
*
* Removes an offset marker previously added with
* gtk_level_bar_add_offset_value().
*/
void
gtk_level_bar_remove_offset_value (GtkLevelBar *self,
const char *name)
{
GList *existing;
g_return_if_fail (GTK_IS_LEVEL_BAR (self));
existing = g_list_find_custom (self->offsets, name, offset_find_func);
if (existing)
{
gtk_level_bar_offset_free (existing->data);
self->offsets = g_list_delete_link (self->offsets, existing);
update_level_style_classes (self);
}
}
/**
* gtk_level_bar_add_offset_value:
* @self: a #GtkLevelBar
* @name: the name of the new offset
* @value: the value for the new offset
*
* Adds a new offset marker on @self at the position specified by @value.
* When the bar value is in the interval topped by @value (or between @value
* and #GtkLevelBar:max-value in case the offset is the last one on the bar)
* a style class named `level-`@name will be applied
* when rendering the level bar fill.
* If another offset marker named @name exists, its value will be
* replaced by @value.
*/
void
gtk_level_bar_add_offset_value (GtkLevelBar *self,
const char *name,
double value)
{
GQuark name_quark;
g_return_if_fail (GTK_IS_LEVEL_BAR (self));
g_return_if_fail (gtk_level_bar_value_in_interval (self, value));
if (!gtk_level_bar_ensure_offset (self, name, value))
return;
update_level_style_classes (self);
name_quark = g_quark_from_string (name);
g_signal_emit (self, signals[SIGNAL_OFFSET_CHANGED], name_quark, name);
}
/**
* gtk_level_bar_get_offset_value:
* @self: a #GtkLevelBar
* @name: (allow-none): the name of an offset in the bar
* @value: (out): location where to store the value
*
* Fetches the value specified for the offset marker @name in @self,
* returning %TRUE in case an offset named @name was found.
*
* Returns: %TRUE if the specified offset is found
*/
gboolean
gtk_level_bar_get_offset_value (GtkLevelBar *self,
const char *name,
double *value)
{
GList *existing;
GtkLevelBarOffset *offset = NULL;
g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), FALSE);
existing = g_list_find_custom (self->offsets, name, offset_find_func);
if (existing)
offset = existing->data;
if (!offset)
return FALSE;
if (value)
*value = offset->value;
return TRUE;
}
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