Grid横向滚动

viewConfig : {    

    layout : function() {    

        if (!this.mainBody) {    

            return; // not rendered    

        }    

        var g = this.grid;    

        var c = g.getGridEl();    

        var csize = c.getSize(true);    

        var vw = csize.width;    

        if (!g.hideHeaders && (vw < 20 || csize.height < 20)) { // display:    

            // none?    

            return;    

        }    

        if (g.autoHeight) {    

            if (this.innerHd) {    

                this.innerHd.style.width = (vw) + 'px';    

            }    

        } else {    

            this.el.setSize(csize.width, csize.height);    

            var hdHeight = this.mainHd.getHeight();    

            var vh = csize.height - (hdHeight);    

            this.scroller.setSize(vw, vh);    

            if (this.innerHd) {    

                this.innerHd.style.width = (vw) + 'px';    

            }    

        }    

        if (this.forceFit) {    

            if (this.lastViewWidth != vw) {    

                this.fitColumns(false, false);    

                this.lastViewWidth = vw;    

            }    

        } else {    

            this.autoExpand();    

            this.syncHeaderScroll();    

        }    

        this.onLayout(vw, vh);    

    }    

}