Turn StBoxLayout:spacing into a style property

Remove the StBoxLayout:spacing GObject property, and instead make
BoxLayout look up the spacing from the CSS style. This makes it
consistent with padding and will allow the use of units. (The
removal of the GObject property entirely instead of making it an
override is consistent with how we handle color, font, padding, etc.)

https://bugzilla.gnome.org/show_bug.cgi?id=596803

src/st/st-box-layout.c

@@ -61,7 +61,6 @@ enum {
 
   PROP_VERTICAL,
   PROP_PACK_START,
-  PROP_SPACING,
 
   PROP_HADJUST,
   PROP_VADJUST
@@ -348,10 +347,6 @@ st_box_layout_get_property (GObject    *object,
       g_value_set_boolean (value, priv->is_pack_start);
       break;
 
-    case PROP_SPACING:
-      g_value_set_uint (value, priv->spacing);
-      break;
-
     case PROP_HADJUST:
       scrollable_get_adjustments (ST_SCROLLABLE (object), &adjustment, NULL);
       g_value_set_object (value, adjustment);
@@ -385,10 +380,6 @@ st_box_layout_set_property (GObject      *object,
       st_box_layout_set_pack_start (box, g_value_get_boolean (value));
       break;
 
-    case PROP_SPACING:
-      st_box_layout_set_spacing (box, g_value_get_uint (value));
-      break;
-
     case PROP_HADJUST:
       scrollable_set_adjustments (ST_SCROLLABLE (object),
                                   g_value_get_object (value),
@@ -1072,11 +1063,28 @@ st_box_layout_pick (ClutterActor       *actor,
     cogl_clip_pop ();
 }
 
+static void
+st_box_layout_style_changed (StWidget *self)
+{
+  StBoxLayoutPrivate *priv = ST_BOX_LAYOUT (self)->priv;
+  StThemeNode *theme_node = st_widget_get_theme_node (self);
+  int old_spacing = priv->spacing;
+  double spacing = 0;
+
+  st_theme_node_get_length (theme_node, "spacing", FALSE, &spacing);
+  priv->spacing = (int)(spacing + 0.5);
+  if (priv->spacing != old_spacing)
+    clutter_actor_queue_relayout (CLUTTER_ACTOR (self));
+
+  ST_WIDGET_CLASS (st_box_layout_parent_class)->style_changed (self);
+}
+
 static void
 st_box_layout_class_init (StBoxLayoutClass *klass)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
   ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
+  StWidgetClass *widget_class = ST_WIDGET_CLASS (klass);
   GParamSpec *pspec;
 
   g_type_class_add_private (klass, sizeof (StBoxLayoutPrivate));
@@ -1093,6 +1101,8 @@ st_box_layout_class_init (StBoxLayoutClass *klass)
   actor_class->paint = st_box_layout_paint;
   actor_class->pick = st_box_layout_pick;
 
+  widget_class->style_changed = st_box_layout_style_changed;
+
   pspec = g_param_spec_boolean ("vertical",
                                 "Vertical",
                                 "Whether the layout should be vertical, rather"
@@ -1108,13 +1118,6 @@ st_box_layout_class_init (StBoxLayoutClass *klass)
                                 ST_PARAM_READWRITE);
   g_object_class_install_property (object_class, PROP_PACK_START, pspec);
 
-  pspec = g_param_spec_uint ("spacing",
-                             "Spacing",
-                             "Spacing between children",
-                             0, G_MAXUINT, 0,
-                             ST_PARAM_READWRITE);
-  g_object_class_install_property (object_class, PROP_SPACING, pspec);
-
   /* StScrollable properties */
   g_object_class_override_property (object_class,
                                     PROP_HADJUST,
@@ -1222,47 +1225,3 @@ st_box_layout_get_pack_start (StBoxLayout *box)
 
   return box->priv->is_pack_start;
 }
-
-/**
- * st_box_layout_set_spacing:
- * @box: A #StBoxLayout
- * @spacing: the spacing value
- *
- * Set the amount of spacing between children in pixels
- *
- */
-void
-st_box_layout_set_spacing (StBoxLayout *box,
-                           guint        spacing)
-{
-  StBoxLayoutPrivate *priv;
-
-  g_return_if_fail (ST_IS_BOX_LAYOUT (box));
-
-  priv = box->priv;
-
-  if (priv->spacing != spacing)
-    {
-      priv->spacing = spacing;
-
-      clutter_actor_queue_relayout (CLUTTER_ACTOR (box));
-
-      g_object_notify (G_OBJECT (box), "spacing");
-    }
-}
-
-/**
- * st_box_layout_get_spacing:
- * @box: A #StBoxLayout
- *
- * Get the spacing between children in pixels
- *
- * Returns: the spacing value
- */
-guint
-st_box_layout_get_spacing (StBoxLayout *box)
-{
-  g_return_val_if_fail (ST_IS_BOX_LAYOUT (box), 0);
-
-  return box->priv->spacing;
-}

src/st/st-box-layout.h

@@ -89,10 +89,6 @@ void     st_box_layout_set_pack_start (StBoxLayout *box,
                                        gboolean     pack_start);
 gboolean st_box_layout_get_pack_start (StBoxLayout *box);
 
-void     st_box_layout_set_spacing    (StBoxLayout *box,
-                                       guint        spacing);
-guint    st_box_layout_get_spacing    (StBoxLayout *box);
-
 G_END_DECLS
 
 #endif /* _ST_BOX_LAYOUT_H */

tests/interactive/borders.js

@@ -13,8 +13,9 @@ stage.height = 700;
 let vbox = new St.BoxLayout({ vertical: true,
                               width: stage.width,
                               height: stage.height,
-                              spacing: 20,
+                              style: 'padding: 10px;'
-                              style: 'padding: 10px; background: #ffee88;' });
+                                     + 'spacing: 20px;'
+                                     + 'background: #ffee88;' });
 stage.add_actor(vbox);
 
 vbox.add(new St.Label({ text: "Hello World",

tests/interactive/box-layout.js

@@ -11,8 +11,8 @@ let stage = Clutter.Stage.get_default();
 let vbox = new St.BoxLayout({ vertical: true,
                               width: stage.width,
                               height: stage.height,
-                              spacing: 10,
+                              style: 'padding: 10px;'
-                              style: 'padding: 10px' });
+                                     + 'spacing: 10px;' });
 stage.add_actor(vbox);
 
 ////////////////////////////////////////////////////////////////////////////////

tests/interactive/inline-style.js

@@ -13,7 +13,7 @@ let vbox = new St.BoxLayout({ vertical: true,
                               height: stage.height });
 stage.add_actor(vbox);
 
-let hbox = new St.BoxLayout({ spacing: 12 });
+let hbox = new St.BoxLayout({ style: 'spacing: 12px;' });
 vbox.add(hbox);
 
 let text = new St.Label({ text: "Styled Text" });