[gnome-shell] st-im-text: Support pre-edit

[Rui Matos <rtcm src gnome org>]

commit ee6086373b30d73c0413237a70705a7b303f38f3
Author: Daiki Ueno <ueno unixuser org>
Date:   Wed Aug 22 17:59:45 2012 +0900

    st-im-text: Support pre-edit
    
    Use clutter_text_set_preedit_string() to wedge pre-edit text
    into ClutterText.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=664041

 src/st/st-im-text.c |   31 +++++++++++++++++++++++++++++++
 1 files changed, 31 insertions(+), 0 deletions(-)
---
diff --git a/src/st/st-im-text.c b/src/st/st-im-text.c
index a3ff24d..d5e287a 100644
--- a/src/st/st-im-text.c
+++ b/src/st/st-im-text.c
@@ -81,6 +81,9 @@ static void st_im_text_commit_cb (GtkIMContext *context,
                                   const gchar  *str,
                                   StIMText     *imtext);
 
+static void st_im_text_preedit_changed_cb (GtkIMContext *context,
+                                           StIMText     *imtext);
+
 G_DEFINE_TYPE (StIMText, st_im_text, CLUTTER_TYPE_TEXT)
 
 static void
@@ -93,6 +96,9 @@ st_im_text_dispose (GObject *object)
       g_signal_handlers_disconnect_by_func (priv->im_context,
                                             (void *) st_im_text_commit_cb,
                                             object);
+      g_signal_handlers_disconnect_by_func (priv->im_context,
+                                            (void *) st_im_text_preedit_changed_cb,
+                                            object);
 
       g_object_unref (priv->im_context);
       priv->im_context = NULL;
@@ -141,6 +147,29 @@ st_im_text_commit_cb (GtkIMContext *context,
 }
 
 static void
+st_im_text_preedit_changed_cb (GtkIMContext *context,
+                               StIMText     *imtext)
+{
+  ClutterText *clutter_text = CLUTTER_TEXT (imtext);
+  gchar *preedit_str = NULL;
+  PangoAttrList *preedit_attrs = NULL;
+  gint cursor_pos = 0;
+
+  gtk_im_context_get_preedit_string (context,
+                                     &preedit_str,
+                                     &preedit_attrs,
+                                     &cursor_pos);
+
+  clutter_text_set_preedit_string (clutter_text,
+                                   preedit_str,
+                                   preedit_attrs,
+                                   cursor_pos);
+
+  g_free (preedit_str);
+  pango_attr_list_unref (preedit_attrs);
+}
+
+static void
 reset_im_context (StIMText *self)
 {
   StIMTextPrivate *priv = self->priv;
@@ -445,6 +474,8 @@ st_im_text_init (StIMText *self)
   priv->im_context = gtk_im_multicontext_new ();
   g_signal_connect (priv->im_context, "commit",
                     G_CALLBACK (st_im_text_commit_cb), self);
+  g_signal_connect (priv->im_context, "preedit-changed",
+                    G_CALLBACK (st_im_text_preedit_changed_cb), self);
 }
 
 /**