mikecx · May 22, 2013 19:04 · May 22, 2013
diff --git a/regions_mixin.js b/regions_mixin.js
@@ -0,0 +1,48 @@
+// Mix regions into Backbone Views that don't have them.
+var Mixins = {
+  Regions: {}
+};
+
+Mixins.Regions = function (parent) {
+  var initialize = parent.prototype.initialize,
+    render = parent.prototype.render,
+    close = parent.prototype.close,
+    functions = ['addRegion', 'addRegions', 'removeRegion', '_buildRegions',
+      '_initializeRegions', '_reInitializeRegions', '_initRegionManager'];
+
+  parent.prototype.initialize = function (options) {
+    for(var func in functions) {
+      parent.prototype[functions[func]] = Backbone.Marionette.Layout.prototype[functions[func]];
+    };
+
+    initialize.apply(this, arguments);
+
+    this._firstRender = true;
+    this._initializeRegions(options);
+  };
+
+  parent.prototype.render = function () {
+    render.apply(this, arguments);
+
+    if (this._firstRender){
+      // if this is the first render, don't do anything to
+      // reset the regions
+      this._firstRender = false;
+    } else if (this.isClosed){
+      // a previously closed layout means we need to
+      // completely re-initialize the regions
+      this._initializeRegions();
+    } else {
+      // If this is not the first render call, then we need to
+      // re-initializing the `el` for each region
+      this._reInitializeRegions();
+    }
+  };
+
+  parent.prototype.close = function () {
+    if (this.isClosed){ return; }
+    this.regionManager.close();
+
+    close.apply(this, arguments);
+  }
+};