PortalLayout is yet another implementation of Vaadin layout. Shortly speaking, all the components you add there are wrapped in the portlets with some fancy functionality built-in (e.g drag and drop and collapsing). What is offered: - No need to settle up DnD functionality. - Communication between portals: * Make whatever complex UI, bundle its parts with portals. * Add portlets. * Drag portlets from one portal to the other easily! * If needed, make one of your portals not communicative with others - it will neither accept portlets from outer space, nor let its contents go. - Dragging by the portlet headers. - Customizable positioner highlights the target drop area. - Various properties of the portlets (can be set from the server side): * Close ability. * Collapse ability. * Collapse state. * Lock state (make it not draggable if needed). * Caption. - Supports both fixed and relative heights. Here relative height in percents stands for the percent of free space the portlet will consume. - Supports spacing and margins. - The width of the portlets is always 100%. - Customize portlet headers, positioners and controls styles. - Action buttons in the headers. - Listeners for the collapse and close events. - Full caption support. - Animations for collapse and close events. - Vaadin components in the headers. - Custom styles for the portlets. The project is still in the phase of the development. I would highly appreciate all the bug reports, suggestions, ideas and user experience.