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gtk2/gtk/gtklevelbar.c
Cosimo Cecchi 68acf78c5d level-bar: introduce GtkLevelBar 
Similar to CcStrengthBar from gnome-control-center, but more generic and
with thorough CSS styling support.

https://bugzilla.gnome.org/show_bug.cgi?id=677892
2012-07-16 01:01:38 -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 two offsets
* by default on the level bar: #GTK_LEVEL_BAR_OFFSET_LOW and
* #GTK_LEVEL_BAR_OFFSET_HIGH, with values 0.25 and 0.75 respectively.
*
* <example>
* <title>Adding a custom offset on the bar</title>
* <programlisting>
*
* static GtkWidget *
* create_level_bar (void)
* {
* GtkWidget *level_bar;
*
* level_bar = gtk_level_bar_new ();
*
* /<!---->* This changes the value of the default low offset *<!---->/
* gtk_level_bar_add_offset_value (GTK_LEVEL_BAR (level_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 by using the following selector,
* * either by adding it to its CSS file or using
* * gtk_css_provider_load_from_data() and gtk_style_context_add_provider()
* *
* * .level-bar.fill-block.level-my-offset {
* * background-color: green;
* * border-style: solid;
* * border-color: black;
* * border-style: 1px;
* * }
* *<!---->/
* gtk_level_bar_add_offset_value (GTK_LEVEL_BAR (level_bar),
* "my-offset", 0.60);
*
* return level_bar;
* }
* </programlisting>
* </example>
*
* 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 and 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.
*
* Since: 3.6
*/
#include "config.h"
#include "gtkbuildable.h"
#include "gtkintl.h"
#include "gtkorientableprivate.h"
#include "gtklevelbar.h"
#include "gtkmarshalers.h"
#include "gtkstylecontext.h"
#include "gtktypebuiltins.h"
#include "gtkwidget.h"
#include <math.h>
#include <stdlib.h>
#define DEFAULT_BLOCK_SIZE 3
/* these don't make sense outside of GtkLevelBar, so we don't add
* global defines */
#define STYLE_CLASS_INDICATOR_CONTINUOUS "indicator-continuous"
#define STYLE_CLASS_INDICATOR_DISCRETE "indicator-discrete"
#define STYLE_CLASS_FILL_BLOCK "fill-block"
#define STYLE_CLASS_EMPTY_FILL_BLOCK "empty-fill-block"
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))
enum {
PROP_VALUE = 1,
PROP_MIN_VALUE,
PROP_MAX_VALUE,
PROP_MODE,
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 {
gchar *name;
gdouble value;
} GtkLevelBarOffset;
struct _GtkLevelBarPrivate {
GtkOrientation orientation;
gdouble min_value;
gdouble max_value;
gdouble cur_value;
GList *offsets;
GtkLevelBarMode bar_mode;
};
static void gtk_level_bar_set_value_internal (GtkLevelBar *self,
gdouble value);
static GtkLevelBarOffset *
gtk_level_bar_offset_new (const gchar *name,
gdouble 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 gint
offset_find_func (gconstpointer data,
gconstpointer user_data)
{
const GtkLevelBarOffset *offset = data;
const gchar *name = user_data;
return g_strcmp0 (name, offset->name);
}
static gint
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 gchar *name,
gdouble value)
{
GList *existing;
GtkLevelBarOffset *offset = NULL;
existing = g_list_find_custom (self->priv->offsets, name, offset_find_func);
if (existing)
offset = existing->data;
if (offset && (offset->value == value))
return FALSE;
if (offset)
{
gtk_level_bar_offset_free (offset);
self->priv->offsets = g_list_delete_link (self->priv->offsets, existing);
}
offset = gtk_level_bar_offset_new (name, value);
self->priv->offsets = g_list_insert_sorted (self->priv->offsets, offset, offset_sort_func);
return TRUE;
}
static gboolean
gtk_level_bar_value_in_interval (GtkLevelBar *self,
gdouble value)
{
return ((value >= self->priv->min_value) &&
(value <= self->priv->max_value));
}
static void
gtk_level_bar_get_min_block_size (GtkLevelBar *self,
gint *block_width,
gint *block_height)
{
GtkWidget *widget = GTK_WIDGET (self);
GtkStyleContext *context = gtk_widget_get_style_context (widget);
GtkStateFlags flags = gtk_widget_get_state_flags (widget);
GtkBorder border, tmp, tmp2;
gint min_width, min_height;
gtk_style_context_save (context);
gtk_style_context_add_class (context, STYLE_CLASS_FILL_BLOCK);
gtk_style_context_get_border (context, flags, &border);
gtk_style_context_get_padding (context, flags, &tmp);
gtk_style_context_get_margin (context, flags, &tmp2);
gtk_style_context_restore (context);
gtk_style_context_get_style (context,
"min-block-width", &min_width,
"min-block-height", &min_height,
NULL);
border.top += tmp.top;
border.right += tmp.right;
border.bottom += tmp.bottom;
border.left += tmp.left;
border.top += tmp2.top;
border.right += tmp2.right;
border.bottom += tmp2.bottom;
border.left += tmp2.left;
if (block_width)
*block_width = MAX (border.left + border.right, min_width);
if (block_height)
*block_height = MAX (border.top + border.bottom, min_height);
}
static gint
gtk_level_bar_get_num_blocks (GtkLevelBar *self)
{
if (self->priv->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
return 1;
else if (self->priv->bar_mode == GTK_LEVEL_BAR_MODE_DISCRETE)
return MAX (1, (gint) (round (self->priv->max_value) - round (self->priv->min_value)));
return 0;
}
static void
gtk_level_bar_get_borders (GtkLevelBar *self,
GtkBorder *borders_out)
{
GtkWidget *widget = GTK_WIDGET (self);
GtkStyleContext *context = gtk_widget_get_style_context (widget);
GtkStateFlags flags = gtk_widget_get_state_flags (widget);
GtkBorder border, tmp;
gtk_style_context_save (context);
gtk_style_context_add_class (context, GTK_STYLE_CLASS_TROUGH);
gtk_style_context_get_border (context, flags, &border);
gtk_style_context_get_padding (context, flags, &tmp);
gtk_style_context_restore (context);
border.top += tmp.top;
border.right += tmp.right;
border.bottom += tmp.bottom;
border.left += tmp.left;
if (borders_out)
*borders_out = border;
}
static void
gtk_level_bar_draw_fill_continuous (GtkLevelBar *self,
cairo_t *cr,
cairo_rectangle_int_t *fill_area)
{
GtkWidget *widget = GTK_WIDGET (self);
GtkStyleContext *context = gtk_widget_get_style_context (widget);
GtkStateFlags flags = gtk_widget_get_state_flags (widget);
cairo_rectangle_int_t base_area, block_area;
GtkBorder block_margin;
gdouble fill_percentage;
gtk_style_context_save (context);
gtk_style_context_add_class (context, STYLE_CLASS_FILL_BLOCK);
gtk_style_context_get_margin (context, flags, &block_margin);
/* render the empty (unfilled) part */
base_area = *fill_area;
base_area.x += block_margin.left;
base_area.y += block_margin.top;
base_area.width -= block_margin.left + block_margin.right;
base_area.height -= block_margin.top + block_margin.bottom;
gtk_style_context_add_class (context, STYLE_CLASS_EMPTY_FILL_BLOCK);
gtk_render_background (context, cr, base_area.x, base_area.y,
base_area.width, base_area.height);
gtk_render_frame (context, cr, base_area.x, base_area.y,
base_area.width, base_area.height);
gtk_style_context_remove_class (context, STYLE_CLASS_EMPTY_FILL_BLOCK);
/* now render the filled part on top of it */
block_area = base_area;
fill_percentage = (self->priv->cur_value - self->priv->min_value) /
(self->priv->max_value - self->priv->min_value);
if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
block_area.width = (gint) floor (block_area.width * fill_percentage);
else
block_area.height = (gint) floor (block_area.height * fill_percentage);
gtk_render_background (context, cr, block_area.x, block_area.y,
block_area.width, block_area.height);
gtk_render_frame (context, cr, block_area.x, block_area.y,
block_area.width, block_area.height);
gtk_style_context_restore (context);
}
static void
gtk_level_bar_draw_fill_discrete (GtkLevelBar *self,
cairo_t *cr,
cairo_rectangle_int_t *fill_area)
{
GtkWidget *widget = GTK_WIDGET (self);
GtkStyleContext *context = gtk_widget_get_style_context (widget);
GtkStateFlags flags = gtk_widget_get_state_flags (widget);
gint num_blocks, num_filled, idx;
gint block_width, block_height;
gint block_draw_width, block_draw_height;
GtkBorder block_margin;
cairo_rectangle_int_t block_area;
gtk_level_bar_get_min_block_size (self, &block_width, &block_height);
block_area = *fill_area;
num_blocks = gtk_level_bar_get_num_blocks (self);
num_filled = (gint) round (self->priv->cur_value) - (gint) round (self->priv->min_value);
if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
block_width = MAX (block_width, (gint) floor (block_area.width / num_blocks));
else
block_height = MAX (block_height, (gint) floor (block_area.height / num_blocks));
gtk_style_context_save (context);
gtk_style_context_add_class (context, STYLE_CLASS_FILL_BLOCK);
gtk_style_context_get_margin (context, flags, &block_margin);
block_draw_width = block_width - block_margin.left - block_margin.right;
block_draw_height = block_height - block_margin.top - block_margin.bottom;
if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
block_draw_height = MAX (block_draw_height, block_area.height - block_margin.top - block_margin.bottom);
block_area.y += block_margin.top;
}
else
{
block_draw_width = MAX (block_draw_width, block_area.width - block_margin.left - block_margin.right);
block_area.x += block_margin.left;
}
for (idx = 0; idx < num_blocks; idx++)
{
if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
block_area.x += block_margin.left;
else
block_area.y += block_margin.top;
if (idx > num_filled - 1)
gtk_style_context_add_class (context, STYLE_CLASS_EMPTY_FILL_BLOCK);
gtk_render_background (context, cr,
block_area.x, block_area.y,
block_draw_width, block_draw_height);
gtk_render_frame (context, cr,
block_area.x, block_area.y,
block_draw_width, block_draw_height);
if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
block_area.x += block_draw_width + block_margin.right;
else
block_area.y += block_draw_height + block_margin.bottom;
}
gtk_style_context_restore (context);
}
static void
gtk_level_bar_draw_fill (GtkLevelBar *self,
cairo_t *cr)
{
GtkWidget *widget = GTK_WIDGET (self);
GtkBorder trough_borders;
cairo_rectangle_int_t fill_area;
gtk_level_bar_get_borders (self, &trough_borders);
fill_area.x = trough_borders.left;
fill_area.y = trough_borders.top;
fill_area.width = gtk_widget_get_allocated_width (widget) -
trough_borders.left - trough_borders.right;
fill_area.height = gtk_widget_get_allocated_height (widget) -
trough_borders.top - trough_borders.bottom;
if (self->priv->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
gtk_level_bar_draw_fill_continuous (self, cr, &fill_area);
else if (self->priv->bar_mode == GTK_LEVEL_BAR_MODE_DISCRETE)
gtk_level_bar_draw_fill_discrete (self, cr, &fill_area);
}
static gboolean
gtk_level_bar_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkLevelBar *self = GTK_LEVEL_BAR (widget);
GtkStyleContext *context = gtk_widget_get_style_context (widget);
gint width, height;
width = gtk_widget_get_allocated_width (widget);
height = gtk_widget_get_allocated_height (widget);
gtk_style_context_save (context);
gtk_style_context_add_class (context, GTK_STYLE_CLASS_TROUGH);
gtk_render_background (context, cr, 0, 0, width, height);
gtk_render_frame (context, cr, 0, 0, width, height);
gtk_style_context_restore (context);
gtk_level_bar_draw_fill (self, cr);
return FALSE;
}
static void
gtk_level_bar_get_preferred_width (GtkWidget *widget,
gint *minimum,
gint *natural)
{
GtkLevelBar *self = GTK_LEVEL_BAR (widget);
GtkBorder borders;
gint num_blocks;
gint width, block_width;
num_blocks = gtk_level_bar_get_num_blocks (self);
gtk_level_bar_get_min_block_size (self, &block_width, NULL);
gtk_level_bar_get_borders (self, &borders);
width = borders.left + borders.right;
if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
width += num_blocks * block_width;
else
width += block_width;
if (minimum)
*minimum = width;
if (natural)
*natural = width;
}
static void
gtk_level_bar_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural)
{
GtkLevelBar *self = GTK_LEVEL_BAR (widget);
GtkBorder borders;
gint num_blocks;
gint height, block_height;
num_blocks = gtk_level_bar_get_num_blocks (self);
gtk_level_bar_get_min_block_size (self, NULL, &block_height);
gtk_level_bar_get_borders (self, &borders);
height = borders.top + borders.bottom;
if (self->priv->orientation == GTK_ORIENTATION_VERTICAL)
height += num_blocks * block_height;
else
height += block_height;
if (minimum)
*minimum = height;
if (natural)
*natural = height;
}
static void
gtk_level_bar_update_mode_style_classes (GtkLevelBar *self)
{
GtkStyleContext *context = gtk_widget_get_style_context (GTK_WIDGET (self));
if (self->priv->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
{
gtk_style_context_remove_class (context, STYLE_CLASS_INDICATOR_DISCRETE);
gtk_style_context_add_class (context, STYLE_CLASS_INDICATOR_CONTINUOUS);
}
else if (self->priv->bar_mode == GTK_LEVEL_BAR_MODE_DISCRETE)
{
gtk_style_context_remove_class (context, STYLE_CLASS_INDICATOR_CONTINUOUS);
gtk_style_context_add_class (context, STYLE_CLASS_INDICATOR_DISCRETE);
}
}
static void
gtk_level_bar_update_level_style_classes (GtkLevelBar *self)
{
GtkStyleContext *context = gtk_widget_get_style_context (GTK_WIDGET (self));
gdouble value = gtk_level_bar_get_value (self);
gchar *offset_style_class, *value_class = NULL;
GtkLevelBarOffset *offset, *prev_offset;
GList *l;
for (l = self->priv->offsets; l != NULL; l = l->next)
{
offset = l->data;
offset_style_class = g_strconcat ("level-", offset->name, NULL);
gtk_style_context_remove_class (context, offset_style_class);
/* find the right offset for our style class */
if (((l->prev == NULL) && (value <= offset->value)) ||
((l->next == NULL) && (value >= offset->value)))
{
value_class = offset_style_class;
}
else if ((l->next != NULL) && (l->prev != NULL))
{
prev_offset = l->prev->data;
if ((prev_offset->value <= value) && (value < offset->value))
value_class = offset_style_class;
}
else
{
g_free (offset_style_class);
}
}
if (value_class != NULL)
{
gtk_style_context_add_class (context, value_class);
g_free (value_class);
}
}
static void
gtk_level_bar_ensure_offsets_in_range (GtkLevelBar *self)
{
GtkLevelBarOffset *offset;
GList *l = self->priv->offsets;
while (l != NULL)
{
offset = l->data;
l = l->next;
if (offset->value < self->priv->min_value)
gtk_level_bar_ensure_offset (self, offset->name, self->priv->min_value);
else if (offset->value > self->priv->max_value)
gtk_level_bar_ensure_offset (self, offset->name, self->priv->max_value);
}
}
typedef struct {
GtkLevelBar *self;
GList *offsets;
} OffsetsParserData;
static void
offset_start_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **names,
const gchar **values,
gpointer user_data,
GError **error)
{
OffsetsParserData *parser_data = user_data;
const gchar *name = NULL;
const gchar *value_str = NULL;
GtkLevelBarOffset *offset;
gint line_number, char_number;
gint idx;
if (strcmp (element_name, "offsets") == 0)
;
else if (strcmp (element_name, "offset") == 0)
{
for (idx = 0; names[idx] != NULL; idx++)
{
if (strcmp (names[idx], "name") == 0)
{
name = values[idx];
}
else if (strcmp (names[idx], "value") == 0)
{
value_str = values[idx];
}
else
{
g_markup_parse_context_get_position (context,
&line_number,
&char_number);
g_set_error (error,
GTK_BUILDER_ERROR,
GTK_BUILDER_ERROR_INVALID_ATTRIBUTE,
"%s:%d:%d '%s' is not a valid attribute of <%s>",
"<input>",
line_number, char_number, names[idx], "offset");
return;
}
}
if (name && value_str)
{
offset = gtk_level_bar_offset_new (name, strtof (value_str, NULL));
parser_data->offsets = g_list_prepend (parser_data->offsets, offset);
}
}
else
{
g_markup_parse_context_get_position (context,
&line_number,
&char_number);
g_set_error (error,
GTK_BUILDER_ERROR,
GTK_BUILDER_ERROR_UNHANDLED_TAG,
"%s:%d:%d unsupported tag for GtkLevelBar: \"%s\"",
"<input>",
line_number, char_number, element_name);
}
}
static const GMarkupParser offset_parser =
{
offset_start_element
};
static gboolean
gtk_level_bar_buildable_custom_tag_start (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *tagname,
GMarkupParser *parser,
gpointer *data)
{
OffsetsParserData *parser_data;
if (child)
return FALSE;
if (strcmp (tagname, "offsets") != 0)
return FALSE;
parser_data = g_slice_new0 (OffsetsParserData);
parser_data->self = GTK_LEVEL_BAR (buildable);
parser_data->offsets = NULL;
*parser = offset_parser;
*data = parser_data;
return TRUE;
}
static void
gtk_level_bar_buildable_custom_finished (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *tagname,
gpointer user_data)
{
OffsetsParserData *parser_data;
GtkLevelBar *self;
GtkLevelBarOffset *offset;
GList *l;
parser_data = user_data;
self = parser_data->self;
if (strcmp (tagname, "offsets") != 0)
goto out;
for (l = parser_data->offsets; l != NULL; l = l->next)
{
offset = l->data;
gtk_level_bar_add_offset_value (self, offset->name, offset->value);
}
out:
g_list_free_full (parser_data->offsets, (GDestroyNotify) gtk_level_bar_offset_free);
g_slice_free (OffsetsParserData, parser_data);
}
static void
gtk_level_bar_buildable_init (GtkBuildableIface *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->priv->orientation != orientation)
{
self->priv->orientation = orientation;
_gtk_orientable_set_style_classes (GTK_ORIENTABLE (self));
gtk_widget_queue_resize (GTK_WIDGET (self));
}
}
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_ORIENTATION:
g_value_set_enum (value, self->priv->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_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);
g_list_free_full (self->priv->offsets, (GDestroyNotify) gtk_level_bar_offset_free);
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->draw = gtk_level_bar_draw;
wclass->get_preferred_width = gtk_level_bar_get_preferred_width;
wclass->get_preferred_height = gtk_level_bar_get_preferred_height;
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.
*
* Since: 3.6
*/
signals[SIGNAL_OFFSET_CHANGED] =
g_signal_new ("offset-changed",
GTK_TYPE_LEVEL_BAR,
G_SIGNAL_RUN_FIRST | G_SIGNAL_DETAILED,
G_STRUCT_OFFSET (GtkLevelBarClass, offset_changed),
NULL, NULL,
_gtk_marshal_VOID__STRING,
G_TYPE_NONE,
1, G_TYPE_STRING);
/**
* GtkLevelBar:value:
*
* The #GtkLevelBar:value property determines the currently
* filled value of the level bar.
*
* Since: 3.6
*/
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);
/**
* GtkLevelBar:min-value:
*
* The #GtkLevelBar:min-value property determines the minimum value of
* the interval that can be displayed by the bar.
*
* Since: 3.6
*/
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);
/**
* GtkLevelBar:max-value:
*
* The #GtkLevelBar:max-value property determaxes the maximum value of
* the interval that can be displayed by the bar.
*
* Since: 3.6
*/
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);
/**
* GtkLevelBar:mode:
*
* The #GtkLevelBar:bar-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.
*
* Since: 3.6
*/
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);
/**
* GtkLevelBar:min-block-height:
*
* The min-block-height style property determines the minimum
* height for blocks filling the #GtkLevelBar widget.
*
* Since: 3.6
*/
gtk_widget_class_install_style_property
(wclass, g_param_spec_int ("min-block-height",
P_("Minimum height for filling blocks"),
P_("Minimum height for blocks that fill the bar"),
1, G_MAXINT, DEFAULT_BLOCK_SIZE,
G_PARAM_READWRITE));
/**
* GtkLevelBar:min-block-width:
*
* The min-block-width style property determines the minimum
* width for blocks filling the #GtkLevelBar widget.
*
* Since: 3.6
*/
gtk_widget_class_install_style_property
(wclass, g_param_spec_int ("min-block-width",
P_("Minimum width for filling blocks"),
P_("Minimum width for blocks that fill the bar"),
1, G_MAXINT, DEFAULT_BLOCK_SIZE,
G_PARAM_READWRITE));
g_type_class_add_private (klass, sizeof (GtkLevelBarPrivate));
g_object_class_install_properties (oclass, LAST_PROPERTY, properties);
}
static void
gtk_level_bar_init (GtkLevelBar *self)
{
GtkStyleContext *context;
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, GTK_TYPE_LEVEL_BAR, GtkLevelBarPrivate);
context = gtk_widget_get_style_context (GTK_WIDGET (self));
gtk_style_context_add_class (context, GTK_STYLE_CLASS_LEVEL_BAR);
self->priv->cur_value = 0.0;
self->priv->min_value = 0.0;
self->priv->max_value = 1.0;
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_update_level_style_classes (self);
self->priv->bar_mode = GTK_LEVEL_BAR_MODE_CONTINUOUS;
gtk_level_bar_update_mode_style_classes (self);
/* set initial orientation and style classes */
self->priv->orientation = GTK_ORIENTATION_HORIZONTAL;
_gtk_orientable_set_style_classes (GTK_ORIENTABLE (self));
gtk_widget_set_has_window (GTK_WIDGET (self), FALSE);
}
/**
* gtk_level_bar_new:
*
* Creates a new #GtkLevelBar.
*
* Returns: a #GtkLevelBar.
*
* Since: 3.6
*/
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
*
* Since: 3.6
*/
GtkWidget *
gtk_level_bar_new_for_interval (gdouble min_value,
gdouble 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
*
* Since: 3.6
*/
gdouble
gtk_level_bar_get_min_value (GtkLevelBar *self)
{
g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), 0.0);
return self->priv->min_value;
}
/**
* gtk_level_bar_get_max_value:
* @self: a #GtkLevelBar
*
* Returns the value of the #GtkLevelBar:max-value property.
*
* Returns: a positive value
*
* Since: 3.6
*/
gdouble
gtk_level_bar_get_max_value (GtkLevelBar *self)
{
g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), 0.0);
return self->priv->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
*
* Since: 3.6
*/
gdouble
gtk_level_bar_get_value (GtkLevelBar *self)
{
g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), 0.0);
return self->priv->cur_value;
}
static void
gtk_level_bar_set_value_internal (GtkLevelBar *self,
gdouble value)
{
self->priv->cur_value = value;
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_VALUE]);
gtk_widget_queue_draw (GTK_WIDGET (self));
}
/**
* gtk_level_bar_set_min_value:
* @self: a #GtkLevelBar
* @value: a positive value
*
* Sets the value of the #GtkLevelBar:min-value property.
*
* Since: 3.6
*/
void
gtk_level_bar_set_min_value (GtkLevelBar *self,
gdouble value)
{
g_return_if_fail (GTK_IS_LEVEL_BAR (self));
g_return_if_fail (value >= 0.0);
if (value != self->priv->min_value)
{
self->priv->min_value = value;
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MIN_VALUE]);
if (self->priv->min_value > self->priv->cur_value)
gtk_level_bar_set_value_internal (self, self->priv->min_value);
gtk_level_bar_update_level_style_classes (self);
}
}
/**
* gtk_level_bar_set_max_value:
* @self: a #GtkLevelBar
* @value: a positive value
*
* Sets the value of the #GtkLevelBar:max-value property.
*
* Since: 3.6
*/
void
gtk_level_bar_set_max_value (GtkLevelBar *self,
gdouble value)
{
g_return_if_fail (GTK_IS_LEVEL_BAR (self));
g_return_if_fail (value >= 0.0);
if (value != self->priv->max_value)
{
self->priv->max_value = value;
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MAX_VALUE]);
if (self->priv->max_value < self->priv->cur_value)
gtk_level_bar_set_value_internal (self, self->priv->max_value);
gtk_level_bar_ensure_offsets_in_range (self);
gtk_level_bar_update_level_style_classes (self);
}
}
/**
* 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.
*
* Since: 3.6
*/
void
gtk_level_bar_set_value (GtkLevelBar *self,
gdouble value)
{
g_return_if_fail (GTK_IS_LEVEL_BAR (self));
if (value != self->priv->cur_value)
{
gtk_level_bar_set_value_internal (self, value);
gtk_level_bar_update_level_style_classes (self);
}
}
/**
* gtk_level_bar_get_mode:
* @self: a #GtkLevelBar
*
* Returns the value of the #GtkLevelBar:mode property.
*
* Returns: a #GtkLevelBarMode
*
* Since: 3.6
*/
GtkLevelBarMode
gtk_level_bar_get_mode (GtkLevelBar *self)
{
g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), 0);
return self->priv->bar_mode;
}
/**
* gtk_level_bar_set_mode:
* @self: a #GtkLevelBar
* @mode: a #GtkLevelBarMode
*
* Sets the value of the #GtkLevelBar:mode property.
*
* Since: 3.6
*/
void
gtk_level_bar_set_mode (GtkLevelBar *self,
GtkLevelBarMode mode)
{
g_return_if_fail (GTK_IS_LEVEL_BAR (self));
if (self->priv->bar_mode != mode)
{
self->priv->bar_mode = mode;
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MODE]);
gtk_level_bar_update_mode_style_classes (self);
gtk_widget_queue_resize (GTK_WIDGET (self));
}
}
/**
* 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().
*
* Since: 3.6
*/
void
gtk_level_bar_remove_offset_value (GtkLevelBar *self,
const gchar *name)
{
GList *existing;
g_return_if_fail (GTK_IS_LEVEL_BAR (self));
existing = g_list_find_custom (self->priv->offsets, name, offset_find_func);
if (existing)
{
gtk_level_bar_offset_free (existing->data);
self->priv->offsets = g_list_delete_link (self->priv->offsets, existing);
gtk_level_bar_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 <literal>level-</literal>@name will be applied
* when rendering the level bar fill.
* If another offset marker named @name exists, its value will be
* replaced by @value.
*
* Since: 3.6
*/
void
gtk_level_bar_add_offset_value (GtkLevelBar *self,
const gchar *name,
gdouble 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;
gtk_level_bar_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
*
* Since: 3.6
*/
gboolean
gtk_level_bar_get_offset_value (GtkLevelBar *self,
const gchar *name,
gdouble *value)
{
GList *existing;
GtkLevelBarOffset *offset = NULL;
g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), 0.0);
existing = g_list_find_custom (self->priv->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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