[IMP] add lazier proxy method on CallbackEnabled, use it in WebClient and ListView

bzr revid: xmo@openerp.com-20120112084910-6fxbzbgmv51utyko

1 files changed, 25 insertions, 0 deletions

diff --git a/addons/web/static/src/js/core.js b/addons/web/static/src/js/core.js
index a194c34f287..d5c096d5a2a 100644
--- a/addons/web/static/src/js/core.js
+++ b/addons/web/static/src/js/core.js
@@ -348,6 +348,31 @@ openerp.web.CallbackEnabled = openerp.web.Class.extend(/** @lends openerp.web.Ca
                 }
             }
         }
+    },
+    /**
+     * Proxies a method of the object, in order to keep the right ``this`` on
+     * method invocations.
+     *
+     * This method is similar to ``Function.prototype.bind`` or ``_.bind``, and
+     * even more so to ``jQuery.proxy`` with a fundamental difference: its
+     * resolution of the method being called is lazy, meaning it will use the
+     * method as it is when the proxy is called, not when the proxy is created.
+     *
+     * Other methods will fix the bound method to what it is when creating the
+     * binding/proxy, which is fine in most javascript code but problematic in
+     * OpenERP Web where developers may want to replace existing callbacks with
+     * theirs.
+     *
+     * The semantics of this precisely replace closing over the method call.
+     *
+     * @param {String} method_name name of the method to invoke
+     * @returns {Function} proxied method
+     */
+    proxy: function (method_name) {
+        var self = this;
+        return function () {
+            return self[method_name].apply(self, arguments);
+        }
     }
 });