[gnome-control-center/wip/gbsneto/new-keyboard-panel: 16/27] keyboard: add helper method for user-friendly accelerators

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit c1529c341729b2df26a607ab3330337e9b88eba3
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Fri Jul 22 16:06:18 2016 -0300

    keyboard: add helper method for user-friendly accelerators
    
    The accelerator formatting method itself is copied from
    GtkCellRendererAccel, and will be used throughout the code
    to format the accelerators just like they used to be before
    moving to the listbox.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=769063

 panels/keyboard/keyboard-shortcuts.c |   29 +++++++++++++++++++++++++++++
 panels/keyboard/keyboard-shortcuts.h |    4 ++++
 2 files changed, 33 insertions(+), 0 deletions(-)
---
diff --git a/panels/keyboard/keyboard-shortcuts.c b/panels/keyboard/keyboard-shortcuts.c
index 5b59eba..46e1569 100644
--- a/panels/keyboard/keyboard-shortcuts.c
+++ b/panels/keyboard/keyboard-shortcuts.c
@@ -397,3 +397,32 @@ parse_keylist_from_file (const gchar *path)
 
   return keylist;
 }
+
+/*
+ * Stolen from GtkCellRendererAccel:
+ * https://git.gnome.org/browse/gtk+/tree/gtk/gtkcellrendereraccel.c#n261
+ */
+gchar*
+convert_keysym_state_to_string (guint           keysym,
+                                GdkModifierType mask,
+                                guint           keycode)
+{
+  gchar *name;
+
+  if (keysym == 0 && keycode == 0)
+    {
+      /* This label is displayed in a treeview cell displaying
+       * a disabled accelerator key combination.
+       */
+      name = g_strdup (_("Disabled"));
+    }
+  else
+    {
+      name = gtk_accelerator_get_label_with_keycode (NULL, keysym, keycode, mask);
+
+      if (name == NULL)
+        name = gtk_accelerator_name_with_keycode (NULL, keysym, keycode, mask);
+    }
+
+  return name;
+}
diff --git a/panels/keyboard/keyboard-shortcuts.h b/panels/keyboard/keyboard-shortcuts.h
index 4631b34..ddf8640 100644
--- a/panels/keyboard/keyboard-shortcuts.h
+++ b/panels/keyboard/keyboard-shortcuts.h
@@ -90,3 +90,7 @@ gboolean is_valid_binding               (guint           keyval,
                                          guint           keycode);
 
 KeyList* parse_keylist_from_file        (const gchar *path);
+
+gchar*   convert_keysym_state_to_string (guint           keysym,
+                                         GdkModifierType mask,
+                                         guint           keycode);