gistfile1.js

    initMixin: function() {
        var resizeF;
        var thisView = this;
        if (typeof window.onresize === "function"){
            resizeF = function(){
                window.onresize();
                thisView.checkBounds();
            };
        }
        else {
            resizeF = function(){
                thisView.checkBounds();
            };
        }
        window.onresize = resizeF;
    },

      checkBounds: function() {
        // recompute bounds, so don't get abandoned off screen
          var rect = this.computeFrameWithParentFrame(null);
          // handle X direction
          this.adjust('left', this._checkX(rect.x, (rect.width/2)));
           // // handle Y direction
           this.adjust('top', this._checkY(rect.y, (rect.height/2)));
    }