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

docs/reference/gtk/gtk-docs.sgml

@@ -102,6 +102,7 @@
       <xi:include href="xml/gtklabel.xml" />
       <xi:include href="xml/gtkprogressbar.xml" />
       <xi:include href="xml/gtkstatusbar.xml" />
+      <xi:include href="xml/gtklevelbar.xml" />
       <xi:include href="xml/gtkinfobar.xml" />
       <xi:include href="xml/gtkstatusicon.xml" />
       <xi:include href="xml/gtkspinner.xml" />

docs/reference/gtk/gtk3-sections.txt

@@ -3247,6 +3247,35 @@ GtkStatusIconPrivate
 gtk_status_icon_get_type
 </SECTION>
 
+<SECTION>
+<FILE>gtklevelbar</FILE>
+<TITLE>GtkLevelBar</TITLE>
+GtkLevelBar
+gtk_level_bar_new
+gtk_level_bar_new_for_interval
+gtk_level_bar_set_mode
+gtk_level_bar_get_mode
+gtk_level_bar_set_value
+gtk_level_bar_get_value
+gtk_level_bar_set_min_value
+gtk_level_bar_get_min_value
+gtk_level_bar_set_max_value
+gtk_level_bar_get_max_value
+gtk_level_bar_add_offset_value
+gtk_level_bar_remove_offset_value
+gtk_level_bar_get_offset_value
+<SUBSECTION Standard>
+GTK_LEVEL_BAR
+GTK_IS_LEVEL_BAR
+GTK_TYPE_LEVEL_BAR
+GTK_LEVEL_BAR_CLASS
+GTK_IS_LEVEL_BAR_CLASS
+GTK_LEVEL_BAR_GET_CLASS
+<SUBSECTION Private>
+GtkLevelBarPrivate
+gtk_level_bar_get_type
+</SECTION>
+
 <SECTION>
 <FILE>gtktable</FILE>
 <TITLE>GtkTable</TITLE>
@@ -5721,6 +5750,7 @@ GTK_STYLE_CLASS_RIGHT
 GTK_STYLE_CLASS_LINKED
 GTK_STYLE_CLASS_ARROW
 GTK_STYLE_CLASS_OSD
+GTK_STYLE_CLASS_LEVEL_BAR
 GTK_STYLE_REGION_COLUMN
 GTK_STYLE_REGION_COLUMN_HEADER
 GTK_STYLE_REGION_ROW
@@ -6232,6 +6262,7 @@ GtkExpanderStyle
 GtkIMPreeditStyle
 GtkIMStatusStyle
 GtkJustification
+GtkLevelBarMode
 GtkMovementStep
 GtkOrientation
 GtkPackType

docs/reference/gtk/gtk3.types.in

@@ -155,6 +155,7 @@ gtk_spinner_get_type
 gtk_statusbar_get_type
 gtk_status_icon_get_type
 gtk_switch_get_type
+gtk_level_bar_get_type
 gtk_style_get_type
 gtk_style_context_get_type
 gtk_style_provider_get_type

docs/reference/gtk/objects_grouped.sgml

@@ -90,6 +90,7 @@
     <link linkend="GtkCalendar">GtkCalendar</link>
     <link linkend="GtkProgressBar">GtkProgressBar</link>
     <link linkend="GtkStatusbar">GtkStatusbar</link>
+    <link linkend="GtkStrengthBar">GtkStrengthBar</link>
     <link linkend="GtkHRuler">GtkHRuler</link>
     <link linkend="GtkVRuler">GtkVRuler</link>
     <link linkend="GtkHScrollbar">GtkHScrollbar</link>

gtk/Makefile.am

@@ -265,6 +265,7 @@ gtk_public_h_sources = 		\
 	gtkinvisible.h		\
 	gtklabel.h		\
 	gtklayout.h		\
+	gtklevelbar.h		\
 	gtklinkbutton.h		\
 	gtkliststore.h		\
 	gtklockbutton.h		\
@@ -729,6 +730,7 @@ gtk_base_c_sources = 		\
 	gtkkeyhash.c		\
 	gtklabel.c		\
 	gtklayout.c		\
+	gtklevelbar.c		\
 	gtklinkbutton.c		\
 	gtkliststore.c		\
 	gtklockbutton.c		\

gtk/gtk.h

@@ -122,6 +122,7 @@
 #include <gtk/gtkinvisible.h>
 #include <gtk/gtklabel.h>
 #include <gtk/gtklayout.h>
+#include <gtk/gtklevelbar.h>
 #include <gtk/gtklinkbutton.h>
 #include <gtk/gtkliststore.h>
 #include <gtk/gtklockbutton.h>

gtk/gtk.symbols

@@ -2566,6 +2566,21 @@ gtk_switch_get_active
 gtk_switch_get_type
 gtk_switch_new
 gtk_switch_set_active
+gtk_level_bar_get_type
+gtk_level_bar_new
+gtk_level_bar_new_for_interval
+gtk_level_bar_set_mode
+gtk_level_bar_get_mode
+gtk_level_bar_set_value
+gtk_level_bar_get_value
+gtk_level_bar_set_min_value
+gtk_level_bar_get_min_value
+gtk_level_bar_set_max_value
+gtk_level_bar_get_max_value
+gtk_level_bar_add_offset_value
+gtk_level_bar_remove_offset_value
+gtk_level_bar_get_offset_value
+gtk_level_bar_mode_get_type
 gtk_style_apply_default_background
 gtk_style_attach
 gtk_style_context_add_class

gtk/gtkenums.h

@@ -932,6 +932,20 @@ typedef enum {
   GTK_BORDER_STYLE_RIDGE
 } GtkBorderStyle;
 
+/**
+ * GtkLevelBarMode:
+ * @GTK_LEVEL_BAR_MODE_CONTINUOUS: the bar has a continuous mode
+ * @GTK_LEVEL_BAR_MODE_DISCRETE: the bar has a discrete mode
+ *
+ * Describes how #GtkLevelBar contents should be rendered.
+ * Note that this enumeration could be extended with additional modes
+ * in the future.
+ */
+typedef enum {
+  GTK_LEVEL_BAR_MODE_CONTINUOUS,
+  GTK_LEVEL_BAR_MODE_DISCRETE
+} GtkLevelBarMode;
+
 G_END_DECLS
 
 

gtk/gtklevelbar.h

@@ -0,0 +1,111 @@
+/* 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>
+ *
+ */
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#ifndef __GTK_LEVEL_BAR_H__
+#define __GTK_LEVEL_BAR_H__
+
+#include <gtk/gtkwidget.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_LEVEL_BAR            (gtk_level_bar_get_type ())
+#define GTK_LEVEL_BAR(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_LEVEL_BAR, GtkLevelBar))
+#define GTK_LEVEL_BAR_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_LEVEL_BAR, GtkLevelBarClass))
+#define GTK_IS_LEVEL_BAR(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_LEVEL_BAR))
+#define GTK_IS_LEVEL_BAR_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_LEVEL_BAR))
+#define GTK_LEVEL_BAR_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_LEVEL_BAR, GtkLevelBarClass))
+
+#define GTK_LEVEL_BAR_OFFSET_LOW  "low"
+#define GTK_LEVEL_BAR_OFFSET_HIGH "high"
+
+typedef struct _GtkLevelBarClass   GtkLevelBarClass;
+typedef struct _GtkLevelBar        GtkLevelBar;
+typedef struct _GtkLevelBarPrivate GtkLevelBarPrivate;
+
+struct _GtkLevelBar {
+  /*< private >*/
+  GtkWidget parent;
+
+  GtkLevelBarPrivate *priv;
+};
+
+struct _GtkLevelBarClass {
+  /*< private >*/
+  GtkWidgetClass parent_class;
+
+  void (* offset_changed) (GtkLevelBar *self,
+                           const gchar *name);
+
+  /* padding for future class expansion */
+  gpointer padding[16];
+};
+
+GDK_AVAILABLE_IN_3_6
+GType      gtk_level_bar_get_type           (void) G_GNUC_CONST;
+
+GDK_AVAILABLE_IN_3_6
+GtkWidget *gtk_level_bar_new                (void);
+
+GDK_AVAILABLE_IN_3_6
+GtkWidget *gtk_level_bar_new_for_interval   (gdouble      min_value,
+                                             gdouble      max_value);
+
+GDK_AVAILABLE_IN_3_6
+void       gtk_level_bar_set_mode           (GtkLevelBar *self,
+                                             GtkLevelBarMode mode);
+GDK_AVAILABLE_IN_3_6
+GtkLevelBarMode gtk_level_bar_get_mode      (GtkLevelBar *self);
+
+GDK_AVAILABLE_IN_3_6
+void       gtk_level_bar_set_value          (GtkLevelBar *self,
+                                             gdouble      value);
+GDK_AVAILABLE_IN_3_6
+gdouble    gtk_level_bar_get_value          (GtkLevelBar *self);
+
+GDK_AVAILABLE_IN_3_6
+void       gtk_level_bar_set_min_value      (GtkLevelBar *self,
+                                             gdouble      value);
+GDK_AVAILABLE_IN_3_6
+gdouble    gtk_level_bar_get_min_value      (GtkLevelBar *self);
+
+GDK_AVAILABLE_IN_3_6
+void       gtk_level_bar_set_max_value      (GtkLevelBar *self,
+                                             gdouble      value);
+GDK_AVAILABLE_IN_3_6
+gdouble    gtk_level_bar_get_max_value      (GtkLevelBar *self);
+
+GDK_AVAILABLE_IN_3_6
+void       gtk_level_bar_add_offset_value   (GtkLevelBar *self,
+                                             const gchar *name,
+                                             gdouble      value);
+GDK_AVAILABLE_IN_3_6
+void       gtk_level_bar_remove_offset_value (GtkLevelBar *self,
+                                              const gchar *name);
+GDK_AVAILABLE_IN_3_6
+gdouble    gtk_level_bar_get_offset_value   (GtkLevelBar *self,
+                                             const gchar *name);
+
+G_END_DECLS
+
+#endif /* __GTK_LEVEL_BAR_H__ */

gtk/gtkstylecontext.h

@@ -691,6 +691,16 @@ struct _GtkStyleContextClass
  */
 #define GTK_STYLE_CLASS_OSD "osd"
 
+/**
+ * GTK_STYLE_CLASS_LEVEL_BAR:
+ *
+ * A CSS class used when rendering a level indicator, such
+ * as a battery charge level, or a password strength.
+ *
+ * This is used by #GtkLevelBar.
+ */
+#define GTK_STYLE_CLASS_LEVEL_BAR "level-bar"
+
 /* Predefined set of widget regions */
 
 /**