[gtk+] WIP: make GtkNotebook window-draggable

[Matthias Clasen <matthiasc src gnome org>]

commit b3a66c59ade144c094d4dbc568e33a5ef85c1a7d
Author: Diego Escalante Urrelo <diegoe igalia com>
Date:   Wed Mar 28 03:38:10 2012 -0500

    WIP: make GtkNotebook window-draggable
    
    https://bugzilla.gnome.org/show_bug.cgi?id=672427
    
    https://bugzilla.gnome.org/show_bug.cgi?id=674587

 gtk/gtknotebook.c |   26 ++++++++++++++++++++++++++
 tests/testgtk.css |    4 ++++
 2 files changed, 30 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtknotebook.c b/gtk/gtknotebook.c
index 5978e3d..5deaed6 100644
--- a/gtk/gtknotebook.c
+++ b/gtk/gtknotebook.c
@@ -2949,6 +2949,32 @@ gtk_notebook_button_press (GtkWidget      *widget,
           priv->drag_offset_y = priv->drag_begin_y - page->allocation.y;
         }
     }
+  else
+    {
+      GtkWidget *window;
+      window = gtk_widget_get_toplevel (widget);
+
+      if (window)
+        {
+          gboolean window_drag = FALSE;
+          gtk_widget_style_get (widget,
+                                "window-dragging", &window_drag,
+                                NULL);
+
+          if (window_drag)
+            {
+              priv->during_detach = FALSE;
+              priv->during_reorder = FALSE;
+              priv->pressed_button = event->button;
+
+              gtk_window_begin_move_drag (GTK_WINDOW (window),
+                                          event->button,
+                                          event->x_root,
+                                          event->y_root,
+                                          event->time);
+            }
+        }
+    }
 
   return TRUE;
 }
diff --git a/tests/testgtk.css b/tests/testgtk.css
index f5e8694..5a6c6c1 100644
--- a/tests/testgtk.css
+++ b/tests/testgtk.css
@@ -24,6 +24,10 @@
     -Gtest-bar: 47;
 }
 
+GtkNotebook {
+    -GtkWidget-window-dragging: true;
+}
+
 GtkLabel:selected {
     background-color: gray;
 }