[gnome-software] Add a utility function for focus grabbing

[Matthias Clasen <matthiasc src gnome org>]

commit bbe92f8d795a9e6c7283899c1c3792cc622c73ef
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Aug 31 18:31:30 2013 -0400

    Add a utility function for focus grabbing
    
    Grabbing focus to a widget is a little tricky, since it
    must be mapped for that to work. Add a utility function
    that waits for that to happen.

 src/gs-utils.c |   16 ++++++++++++++++
 src/gs-utils.h |    1 +
 2 files changed, 17 insertions(+), 0 deletions(-)
---
diff --git a/src/gs-utils.c b/src/gs-utils.c
index 613ea7a..052bce4 100644
--- a/src/gs-utils.c
+++ b/src/gs-utils.c
@@ -95,3 +95,19 @@ gs_container_remove_all (GtkContainer *container)
         gtk_container_foreach (container, remove_all_cb, container);
 }
 
+static void
+grab_focus (GtkWidget *widget)
+{
+        g_signal_handlers_disconnect_by_func (widget, grab_focus, NULL);
+        gtk_widget_grab_focus (widget);
+}
+
+void
+gs_grab_focus_when_mapped (GtkWidget *widget)
+{
+        if (gtk_widget_get_mapped (widget))
+                gtk_widget_grab_focus (widget);
+        else
+                g_signal_connect_after (widget, "map",
+                                        G_CALLBACK (grab_focus), NULL);
+}
diff --git a/src/gs-utils.h b/src/gs-utils.h
index 0ebf5a1..c60e9a9 100644
--- a/src/gs-utils.h
+++ b/src/gs-utils.h
@@ -29,6 +29,7 @@ G_BEGIN_DECLS
 void gs_start_spinner (GtkSpinner *spinner);
 void gs_stop_spinner (GtkSpinner *spinner);
 void gs_container_remove_all (GtkContainer *container);
+void gs_grab_focus_when_mapped (GtkWidget *widget);
 
 G_END_DECLS