declare namespace Ext {
    export namespace dd {
        export interface DropZoneConfig {
            containerScroll?: boolean;
            ddGroup?: string;
            dropAllowed?: string;
            dropNotAllowed?: string;
            overClass?: string;
        }

        export class DropZone extends Ext.dd.DropTarget  {
            public getTargetFromEvent(e?: Event): object;
            public onContainerDrop(source?: Ext.dd.DragSource, e?: Event, data?: object): boolean;
            public onContainerOver(source?: Ext.dd.DragSource, e?: Event, data?: object): string;
            public onNodeDrop(nodeData?: object, source?: Ext.dd.DragSource, e?: Event, data?: object): boolean;
            public onNodeEnter(nodeData?: object, source?: Ext.dd.DragSource, e?: Event, data?: object): void;
            public onNodeOut(nodeData?: object, source?: Ext.dd.DragSource, e?: Event, data?: object): void;
            public onNodeOver(nodeData?: object, source?: Ext.dd.DragSource, e?: Event, data?: object): string;
        }
    }
}