[gnome-builder/wip/chergert/headerbar] util: add helper to get current context for a widget

[Christian Hergert <chergert src gnome org>]

commit 4bfa3b66037da1801e1416077d665dc1ac856018
Author: Christian Hergert <chergert redhat com>
Date:   Tue Jun 21 18:07:50 2016 -0700

    util: add helper to get current context for a widget
    
    This is the combination of a get_workbench() + get_context().

 libide/util/ide-gtk.c |   30 ++++++++++++++++++++++++++----
 libide/util/ide-gtk.h |    1 +
 2 files changed, 27 insertions(+), 4 deletions(-)
---
diff --git a/libide/util/ide-gtk.c b/libide/util/ide-gtk.c
index eec79e4..eb79211 100644
--- a/libide/util/ide-gtk.c
+++ b/libide/util/ide-gtk.c
@@ -113,15 +113,17 @@ ide_widget_notify_context (GtkWidget  *toplevel,
                            GtkWidget  *widget)
 {
   IdeWidgetContextHandler handler;
-  IdeContext *context = NULL;
+  g_autoptr(IdeContext) context = NULL;
 
   handler = g_object_get_data (G_OBJECT (widget), "IDE_CONTEXT_HANDLER");
-  if (!handler)
+  if (handler == NULL)
     return;
 
-  g_object_get (toplevel, "context", &context, NULL);
+  g_object_get (toplevel,
+                "context", &context,
+                NULL);
+
   handler (widget, context);
-  g_clear_object (&context);
 }
 
 static void
@@ -415,3 +417,23 @@ ide_widget_add_style_class (GtkWidget   *widget,
 
   gtk_style_context_add_class (gtk_widget_get_style_context (widget), class_name);
 }
+
+/**
+ * ide_widget_get_context: (skip)
+ *
+ * Returns: (nullable) (transfer none): An #IdeContext or %NULL.
+ */
+IdeContext *
+ide_widget_get_context (GtkWidget *widget)
+{
+  IdeWorkbench *workbench;
+
+  g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
+
+  workbench = ide_widget_get_workbench (widget);
+
+  if (workbench == NULL)
+    return NULL;
+
+  return ide_workbench_get_context (workbench);
+}
diff --git a/libide/util/ide-gtk.h b/libide/util/ide-gtk.h
index bcf75fa..869020f 100644
--- a/libide/util/ide-gtk.h
+++ b/libide/util/ide-gtk.h
@@ -40,6 +40,7 @@ gboolean      ide_widget_action_with_string  (GtkWidget               *widget,
                                               const gchar             *param);
 void          ide_widget_set_context_handler (gpointer                 widget,
                                               IdeWidgetContextHandler  handler);
+IdeContext   *ide_widget_get_context         (GtkWidget               *widget);
 void          ide_widget_hide_with_fade      (GtkWidget               *widget);
 void          ide_widget_show_with_fade      (GtkWidget               *widget);
 void          ide_widget_add_style_class     (GtkWidget               *widget,