[gtk+] Add a header bar example to gtk-demo

[Matthias Clasen <matthiasc src gnome org>]

commit f7d4a2772bba0851f4703679ddf5390092e8f01c
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Dec 12 16:09:34 2013 -0500

    Add a header bar example to gtk-demo
    
    This is basically standalone the testtitlebar example, turned
    into a demo.

 demos/gtk-demo/Makefile.am        |    1 +
 demos/gtk-demo/demo.gresource.xml |    1 +
 demos/gtk-demo/headerbar.c        |   71 +++++++++++++++++++++++++++++++++++++
 3 files changed, 73 insertions(+), 0 deletions(-)
---
diff --git a/demos/gtk-demo/Makefile.am b/demos/gtk-demo/Makefile.am
index 49a9a70..97bc571 100644
--- a/demos/gtk-demo/Makefile.am
+++ b/demos/gtk-demo/Makefile.am
@@ -24,6 +24,7 @@ demos =                                               \
        entry_completion.c                      \
        event_axes.c                            \
        expander.c                              \
+       headerbar.c                             \
        hypertext.c                             \
        iconview.c                              \
        iconview_edit.c                         \
diff --git a/demos/gtk-demo/demo.gresource.xml b/demos/gtk-demo/demo.gresource.xml
index 19c582b..d8efe4f 100644
--- a/demos/gtk-demo/demo.gresource.xml
+++ b/demos/gtk-demo/demo.gresource.xml
@@ -94,6 +94,7 @@
     <file>event_axes.c</file>
     <file>expander.c</file>
     <file>flowbox.c</file>
+    <file>headerbar.c</file>
     <file>hypertext.c</file>
     <file>iconview.c</file>
     <file>iconview_edit.c</file>
diff --git a/demos/gtk-demo/headerbar.c b/demos/gtk-demo/headerbar.c
new file mode 100644
index 0000000..c6dcbb4
--- /dev/null
+++ b/demos/gtk-demo/headerbar.c
@@ -0,0 +1,71 @@
+/* Header Bar
+ *
+ * GtkHeaderBar is a container that is suitable for implementing
+ * window titlebars. One of its features is that it can position
+ * a title (and optional subtitle) centered with regard to the
+ * full width, regardless of variable-width content at the left
+ * or right.
+ *
+ * It is commonly used with gtk_window_set_titlebar()
+ */
+
+#include <gtk/gtk.h>
+
+GtkWidget *
+do_headerbar (GtkWidget *do_widget)
+{
+  static GtkWidget *window = NULL;
+  GtkWidget *header;
+  GtkWidget *button;
+  GtkWidget *box;
+  GtkWidget *image;
+  GIcon *icon;
+
+  if (!window)
+    {
+      window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+      gtk_window_set_screen (GTK_WINDOW (window), gtk_widget_get_screen (do_widget));
+      g_signal_connect (window, "destroy",
+                        G_CALLBACK (gtk_widget_destroyed), &window);
+      gtk_window_set_default_size (GTK_WINDOW (window), 600, 400);
+
+      header = gtk_header_bar_new ();
+      gtk_header_bar_set_show_close_button (GTK_HEADER_BAR (header), TRUE);
+      gtk_header_bar_set_title (GTK_HEADER_BAR (header), "Welcome to Facebook - Log in, sign up or learn 
more");
+      gtk_header_bar_set_has_subtitle (GTK_HEADER_BAR (header), FALSE);
+
+      button = gtk_button_new ();
+      icon = g_themed_icon_new ("mail-send-receive-symbolic");
+      image = gtk_image_new_from_gicon (icon, GTK_ICON_SIZE_BUTTON);
+      g_object_unref (icon);
+      gtk_container_add (GTK_CONTAINER (button), image);
+      gtk_header_bar_pack_end (GTK_HEADER_BAR (header), button);
+
+      box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
+      gtk_style_context_add_class (gtk_widget_get_style_context (box), "linked");
+      button = gtk_button_new ();
+      gtk_container_add (GTK_CONTAINER (button), gtk_arrow_new (GTK_ARROW_LEFT, GTK_SHADOW_NONE));
+      gtk_container_add (GTK_CONTAINER (box), button);
+      button = gtk_button_new ();
+      gtk_container_add (GTK_CONTAINER (button), gtk_arrow_new (GTK_ARROW_RIGHT, GTK_SHADOW_NONE));
+      gtk_container_add (GTK_CONTAINER (box), button);
+
+      gtk_header_bar_pack_start (GTK_HEADER_BAR (header), box);
+
+      gtk_window_set_titlebar (GTK_WINDOW (window), header);
+
+      gtk_container_add (GTK_CONTAINER (window), gtk_text_view_new ());
+    }
+
+  if (!gtk_widget_get_visible (window))
+    {
+      gtk_widget_show_all (window);
+    }
+  else
+    {
+      gtk_widget_destroy (window);
+      window = NULL;
+    }
+
+  return window;
+}