Add GtkSwitch, a "light-switch" like widget

The GtkSwitch widget is a simple UI control that has two states: on and
off. Toggling between the states is possible by clicking the widget or
by dragging the handle.

https://bugzilla.gnome.org/show_bug.cgi?id=634987

gtk/Makefile.am

@@ -288,6 +288,7 @@ gtk_public_h_sources =          \
 	gtkstatusicon.h		\
 	gtkstock.h		\
 	gtkstyle.h		\
+	gtkswitch.h		\
 	gtktable.h		\
 	gtktearoffmenuitem.h    \
 	gtktestutils.h		\
@@ -561,6 +562,7 @@ gtk_base_c_sources =            \
 	gtkstatusicon.c		\
 	gtkstock.c		\
 	gtkstyle.c		\
+	gtkswitch.c		\
 	gtktable.c		\
 	gtktearoffmenuitem.c    \
 	gtktestutils.c		\

gtk/gtk.h

@@ -171,6 +171,7 @@
 #include <gtk/gtkstatusicon.h>
 #include <gtk/gtkstock.h>
 #include <gtk/gtkstyle.h>
+#include <gtk/gtkswitch.h>
 #include <gtk/gtktable.h>
 #include <gtk/gtktearoffmenuitem.h>
 #include <gtk/gtktextbuffer.h>

gtk/gtk.symbols

@@ -2236,6 +2236,10 @@ gtk_stock_item_free
 gtk_stock_list_ids
 gtk_stock_lookup
 gtk_stock_set_translate_func
+gtk_switch_get_active
+gtk_switch_get_type G_GNUC_CONST
+gtk_switch_new
+gtk_switch_set_active
 gtk_style_apply_default_background
 gtk_style_attach
 gtk_style_copy

gtk/gtkswitch.h

+/* GTK - The GIMP Toolkit
+ *
+ * Copyright (C) 2010  Intel Corporation
+ * Copyright (C) 2010  RedHat, 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, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA  02111-1307, USA.
+ *
+ * Author:
+ *      Emmanuele Bassi <ebassi@linux.intel.com>
+ *      Matthias Clasen <mclasen@redhat.com>
+ *
+ * Based on similar code from:
+ *      Thomas Wood <thos@linux.intel.com>
+ */
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#ifndef __GTK_SWITCH_H__
+#define __GTK_SWITCH_H__
+
+#include <gtk/gtkwidget.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_SWITCH                 (gtk_switch_get_type ())
+#define GTK_SWITCH(obj)                 (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_SWITCH, GtkSwitch))
+#define GTK_IS_SWITCH(obj)              (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_SWITCH))
+#define GTK_SWITCH_CLASS(klass)         (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_SWITCH, GtkSwitchClass))
+#define GTK_IS_SWITCH_CLASS(klass)      (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_SWITCH))
+#define GTK_SWITCH_GET_CLASS(obj)       (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_SWITCH, GtkSwitchClass))
+
+typedef struct _GtkSwitch               GtkSwitch;
+typedef struct _GtkSwitchPrivate        GtkSwitchPrivate;
+typedef struct _GtkSwitchClass          GtkSwitchClass;
+
+/**
+ * GtkSwitch:
+ *
+ * The <structname>GtkSwitch</structname> structure contains private
+ * data and it should only be accessed using the provided API.
+ */
+struct _GtkSwitch
+{
+  /*< private >*/
+  GtkWidget parent_instance;
+
+  GtkSwitchPrivate *priv;
+};
+
+/**
+ * GtkSwitchClass:
+ *
+ * The <structname>GtkSwitchClass</structname> structure contains only
+ * private data.
+ */
+struct _GtkSwitchClass
+{
+  /*< private >*/
+  GtkWidgetClass parent_class;
+
+  void (* _switch_padding_1) (void);
+  void (* _switch_padding_2) (void);
+  void (* _switch_padding_3) (void);
+  void (* _switch_padding_4) (void);
+  void (* _switch_padding_5) (void);
+  void (* _switch_padding_6) (void);
+  void (* _switch_padding_7) (void);
+};
+
+GType gtk_switch_get_type (void) G_GNUC_CONST;
+
+GtkWidget *     gtk_switch_new          (void);
+
+void            gtk_switch_set_active   (GtkSwitch *sw,
+                                         gboolean   is_active);
+gboolean        gtk_switch_get_active   (GtkSwitch *sw);
+
+G_END_DECLS
+
+#endif /* __GTK_SWITCH_H__ */

tests/Makefile.am

@@ -95,7 +95,8 @@ noinst_PROGRAMS =  $(TEST_PROGS)	\
 	testexpand			\
 	testexpander			\
 	testvolumebutton		\
-	testscrolledwindow
+	testscrolledwindow		\
+	testswitch
 
 if USE_X11
 noinst_PROGRAMS += testerrors
@@ -184,6 +185,7 @@ testscrolledwindow_DEPENDENCIES = $(TEST_DEPS)
 testwindows_DEPENDENCIES = $(TEST_DEPS)
 testexpand_DEPENDENCIES = $(TEST_DEPS)
 testexpander_DEPENDENCIES = $(TEST_DEPS)
+testswitch_DEPENDENCIES = $(TEST_DEPS)
 
 flicker_LDADD = $(LDADDS)
 simple_LDADD = $(LDADDS)
@@ -258,6 +260,7 @@ testscrolledwindow_LDADD = $(LDADDS)
 testwindows_LDADD = $(LDADDS)
 testexpand_LDADD = $(LDADDS)
 testexpander_LDADD = $(LDADDS)
+testswitch_LDADD = $(LDADDS)
 
 testentrycompletion_SOURCES = 	\
 	prop-editor.c		\
@@ -382,6 +385,8 @@ testexpand_SOURCES = testexpand.c
 
 testexpander_SOURCES = testexpander.c
 
+testswitch_SOURCES = testswitch.c
+
 EXTRA_DIST += 			\
 	prop-editor.h		\
 	testgtk.1 		\

tests/testswitch.c

+#include <stdlib.h>
+#include <gtk/gtk.h>
+
+static gboolean
+boolean_to_text (GBinding *binding,
+                 const GValue *source,
+                 GValue *target,
+                 gpointer dummy G_GNUC_UNUSED)
+{
+  if (g_value_get_boolean (source))
+    g_value_set_string (target, "Enabled");
+  else
+    g_value_set_string (target, "Disabled");
+
+  return TRUE;
+}
+
+static GtkWidget *
+make_switch (gboolean is_on,
+             gboolean is_sensitive)
+{
+  GtkWidget *hbox;
+  GtkWidget *sw, *label;
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
+
+  sw = gtk_switch_new ();
+  gtk_switch_set_active (GTK_SWITCH (sw), is_on);
+  gtk_box_pack_start (GTK_BOX (hbox), sw, FALSE, FALSE, 0);
+  gtk_widget_set_sensitive (sw, is_sensitive);
+  gtk_widget_show (sw);
+
+  label = gtk_label_new (is_on ? "Enabled" : "Disabled");
+  gtk_box_pack_end (GTK_BOX (hbox), label, TRUE, TRUE, 0);
+  gtk_widget_show (label);
+
+  g_object_bind_property_full (sw, "active",
+                               label, "label",
+                               G_BINDING_DEFAULT,
+                               boolean_to_text,
+                               NULL,
+                               NULL, NULL);
+
+  return hbox;
+}
+
+int
+main (int   argc,
+      char *argv[])
+{
+  GtkWidget *window;
+  GtkWidget *vbox, *hbox;
+
+  gtk_init (&argc, &argv);
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_window_set_title (GTK_WINDOW (window), "GtkSwitch");
+  gtk_window_set_default_size (GTK_WINDOW (window), 400, -1);
+  gtk_container_set_border_width (GTK_CONTAINER (window), 6);
+  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
+  gtk_widget_show (window);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
+  gtk_container_add (GTK_CONTAINER (window), vbox);
+  gtk_widget_show (vbox);
+
+  hbox = make_switch (FALSE, TRUE);
+  gtk_container_add (GTK_CONTAINER (vbox), hbox);
+  gtk_widget_show (hbox);
+
+  hbox = make_switch (TRUE, TRUE);
+  gtk_container_add (GTK_CONTAINER (vbox), hbox);
+  gtk_widget_show (hbox);
+
+  hbox = make_switch (FALSE, FALSE);
+  gtk_container_add (GTK_CONTAINER (vbox), hbox);
+  gtk_widget_show (hbox);
+
+  hbox = make_switch (TRUE, FALSE);
+  gtk_container_add (GTK_CONTAINER (vbox), hbox);
+  gtk_widget_show (hbox);
+
+  gtk_main ();
+
+  return EXIT_SUCCESS;
+}