Added GtkScrollablePolicy property to scrollable interface

This patch adds the GtkScrollablePolicy type property to GtkScrollable
and implements it in all subclasses. GtkScrolledWindow observes this
property to make a good guess about when to show/hide scrollbars for
height-for-width content.

Most scrollable children do not do height-for-width *yet* but
most certainly will (toolpalette, treeview, iconview, textview
widgets all TODO), for scrollable widgets that do have a minimum
and natural size, it's important for them to observe the state
of this property in order to properly drive the scroll adjustments
according to the desired GtkScrollablePolicy. This patch makes
GtkViewport do this.

Patch also adds tests/testscrolledwindow.c to display the effects
of this property.

1 files changed, 33 insertions, 6 deletions

diff --git a/gtk/gtktoolpalette.c b/gtk/gtktoolpalette.c
index 6d9c5c13f6..bc60c3d210 100644
--- a/gtk/gtktoolpalette.c
+++ b/gtk/gtktoolpalette.c
@@ -122,7 +122,9 @@ enum
   PROP_ORIENTATION,
   PROP_TOOLBAR_STYLE,
   PROP_HADJUSTMENT,
-  PROP_VADJUSTMENT
+  PROP_VADJUSTMENT,
+  PROP_HSCROLL_POLICY,
+  PROP_VSCROLL_POLICY
 };
 
 enum
@@ -159,10 +161,15 @@ struct _GtkToolPalettePrivate
 
   GtkSizeGroup         *text_size_group;
 
-  GtkSettings       *settings;
-  gulong             settings_connection;
+  GtkSettings          *settings;
+  gulong                settings_connection;
 
   guint                 drag_source : 2;
+
+  /* GtkScrollablePolicy needs to be checked when
+   * driving the scrollable adjustment values */
+  guint hscroll_policy : 1;
+  guint vscroll_policy : 1;
 };
 
 struct _GtkToolPaletteDragData
@@ -276,6 +283,16 @@ gtk_tool_palette_set_property (GObject      *object,
         gtk_tool_palette_set_vadjustment (palette, g_value_get_object (value));
         break;
 
+      case PROP_HSCROLL_POLICY:
+	palette->priv->hscroll_policy = g_value_get_enum (value);
+	gtk_widget_queue_resize (GTK_WIDGET (palette));
+	break;
+
+      case PROP_VSCROLL_POLICY:
+	palette->priv->vscroll_policy = g_value_get_enum (value);
+	gtk_widget_queue_resize (GTK_WIDGET (palette));
+	break;
+
       default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
         break;
@@ -316,6 +333,14 @@ gtk_tool_palette_get_property (GObject    *object,
         g_value_set_object (value, palette->priv->vadjustment);
         break;
 
+      case PROP_HSCROLL_POLICY:
+	g_value_set_enum (value, palette->priv->hscroll_policy);
+	break;
+
+      case PROP_VSCROLL_POLICY:
+	g_value_set_enum (value, palette->priv->vscroll_policy);
+	break;
+
       default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
         break;
@@ -952,10 +977,12 @@ gtk_tool_palette_class_init (GtkToolPaletteClass *cls)
    */
   wclass->screen_changed      = gtk_tool_palette_screen_changed;
 
-  g_object_class_override_property (oclass, PROP_ORIENTATION, "orientation");
+  g_object_class_override_property (oclass, PROP_ORIENTATION,    "orientation");
 
-  g_object_class_override_property (oclass, PROP_HADJUSTMENT, "hadjustment");
-  g_object_class_override_property (oclass, PROP_VADJUSTMENT, "vadjustment");
+  g_object_class_override_property (oclass, PROP_HADJUSTMENT,    "hadjustment");
+  g_object_class_override_property (oclass, PROP_VADJUSTMENT,    "vadjustment");
+  g_object_class_override_property (oclass, PROP_HSCROLL_POLICY, "hscroll-policy");
+  g_object_class_override_property (oclass, PROP_VSCROLL_POLICY, "vscroll-policy");
 
   /**
    * GtkToolPalette:icon-size: