[gnome-shell] environment: Add some convenience LayoutManager monkey-patching

[Florian Müllner <fmuellner src gnome org>]

commit 6fd3c0fbb4a9b0f59903599564947f313379bcfb
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Jul 9 23:04:45 2013 +0200

    environment: Add some convenience LayoutManager monkey-patching
    
    Similar to our ClutterContainer monkey-patching, we can add some
    convenience to existing ClutterLayoutManagers:
    
     - hookup_style() to bind layoutManager properties to CSS properties
     - child_set() to set child properties
    
    https://bugzilla.gnome.org/show_bug.cgi?id=703905

 js/ui/environment.js |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/environment.js b/js/ui/environment.js
index aa7a4bd..3d6ba69 100644
--- a/js/ui/environment.js
+++ b/js/ui/environment.js
@@ -10,6 +10,7 @@ const Clutter = imports.gi.Clutter;;
 const Gettext = imports.gettext;
 const GLib = imports.gi.GLib;
 const Gtk = imports.gi.Gtk;
+const Lang = imports.lang;
 const Shell = imports.gi.Shell;
 const St = imports.gi.St;
 
@@ -39,6 +40,22 @@ function _patchContainerClass(containerClass) {
     };
 }
 
+function _patchLayoutClass(layoutClass, styleProps) {
+    if (styleProps)
+        layoutClass.prototype.hookup_style = function(container) {
+            container.connect('style-changed', Lang.bind(this, function() {
+                let node = container.get_theme_node();
+                for (let prop in styleProps)
+                    this[prop] = node.get_length(styleProps[prop]);
+            }));
+        };
+    layoutClass.prototype.child_set = function(actor, props) {
+        let meta = this.get_child_meta(actor.get_parent(), actor);
+        for (let prop in props)
+            meta[prop] = props[prop];
+    };
+}
+
 function _makeLoggingFunc(func) {
     return function() {
         return func([].join.call(arguments, ', '));
@@ -60,6 +77,12 @@ function init() {
     _patchContainerClass(St.BoxLayout);
     _patchContainerClass(St.Table);
 
+    _patchLayoutClass(Clutter.TableLayout, { row_spacing: 'spacing-rows',
+                                             column_spacing: 'spacing-columns' });
+    _patchLayoutClass(Clutter.GridLayout, { row_spacing: 'spacing-rows',
+                                            column_spacing: 'spacing-columns' });
+    _patchLayoutClass(Clutter.BoxLayout, { spacing: 'spacing' });
+
     Clutter.Actor.prototype.toString = function() {
         return St.describe_actor(this);
     };