[mutter/gbsneto/bind-preferred-size] bind-constraint: Update the preferred size

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 4f8e518d42e4f07239a41fc3cef9515b94c59dda
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Sun Dec 14 14:54:35 2014 +0000

    bind-constraint: Update the preferred size
    
    Bind the preferred size of an actor using a BindConstraint to the
    preferred size of the source of the constraint, depending on the
    coordinate of the constraint.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/1070

 clutter/clutter/clutter-bind-constraint.c | 51 +++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
---
diff --git a/clutter/clutter/clutter-bind-constraint.c b/clutter/clutter/clutter-bind-constraint.c
index 3443599e6..11eb5110e 100644
--- a/clutter/clutter/clutter-bind-constraint.c
+++ b/clutter/clutter/clutter-bind-constraint.c
@@ -144,6 +144,55 @@ source_destroyed (ClutterActor          *actor,
   bind->source = NULL;
 }
 
+static void
+clutter_bind_constraint_update_preferred_size (ClutterConstraint  *constraint,
+                                               ClutterActor       *actor,
+                                               ClutterOrientation  direction,
+                                               float               for_size,
+                                               float              *minimum_size,
+                                               float              *natural_size)
+{
+  ClutterBindConstraint *bind = CLUTTER_BIND_CONSTRAINT (constraint);
+  float source_min, source_nat;
+
+  if (bind->source == NULL)
+    return;
+
+  /* only these bindings affect the preferred size */
+  if (!(bind->coordinate == CLUTTER_BIND_WIDTH ||
+        bind->coordinate == CLUTTER_BIND_HEIGHT ||
+        bind->coordinate == CLUTTER_BIND_SIZE ||
+        bind->coordinate == CLUTTER_BIND_ALL))
+    return;
+
+  switch (direction)
+    {
+    case CLUTTER_ORIENTATION_HORIZONTAL:
+      if (bind->coordinate != CLUTTER_BIND_HEIGHT)
+        {
+          clutter_actor_get_preferred_width (bind->source, for_size,
+                                             &source_min,
+                                             &source_nat);
+
+          *minimum_size = source_min;
+          *natural_size = source_nat;
+        }
+      break;
+
+    case CLUTTER_ORIENTATION_VERTICAL:
+      if (bind->coordinate != CLUTTER_BIND_WIDTH)
+        {
+          clutter_actor_get_preferred_height (bind->source, for_size,
+                                              &source_min,
+                                              &source_nat);
+
+          *minimum_size = source_min;
+          *natural_size = source_nat;
+        }
+      break;
+    }
+}
+
 static void
 clutter_bind_constraint_update_allocation (ClutterConstraint *constraint,
                                            ClutterActor      *actor,
@@ -328,6 +377,8 @@ clutter_bind_constraint_class_init (ClutterBindConstraintClass *klass)
   meta_class->set_actor = clutter_bind_constraint_set_actor;
 
   constraint_class->update_allocation = clutter_bind_constraint_update_allocation;
+  constraint_class->update_preferred_size = clutter_bind_constraint_update_preferred_size;
+
   /**
    * ClutterBindConstraint:source:
    *