* Add DragSource Extension (#8169)
* Add DropTarget Extension (#8170)
* Add DragStart Event to DragSource Extension (#8171)
* Make DataTransfer.dropEffect configurable (#8174)
* Make DragSource.dataTransfer data configurable (#8172)
* Add server-side Event for drop (#8177)
* Added license headers
* Extract handler methods, move DropEvent and DropListener to new file, move enums to top
* Replaced LinkedHashMap with Map and added List to preserve order of data
* Add API for adding a JS acceptance criteria for dragover and drop (#8178, #8179)
* Make DragSource Extension extendable (#8175)
* Make DropTarget Extension extendable (#8176)
* Added javadoc to protected methods
* Moved EffectAllowed to shared so that it could be used in shared state directly
* Moved DropEffect to separate file, some review fixes and javadoc
* Added list to DropTargetRpc to preserve order of data
* Remove event listeners on unregister
* Changed method names set/getData() to more descriptive set/getTransferData()
* Add server side dragStart event (#8171)
* Add style to prevent text selection to allow drag
* Remove target indicator style on drop
* Add client side dragend event listener for drag source
* Add server side dragend listener.
Attach client side listener only when server side listener added.
* Add drag source information to server side dragstart and dragend events.
* Fixed some issues addressed in review
* Trigger server side dragstart only when there is a listener attached
* Criteria script can be set as null to clear
* Use Js Interop instead of JSNI for handling event listeners
* Use elemental package instead of Js Interop for handling event listeners
* Add missing javadoc for public methods
* Add default value "uninitialized" to effectAllowed parameter
* Simple test UI for HTML5 DnD functionality (#8395)
* Add javadoc and other minor changes
Replaced ComponentErrorHandler with generic ErrorHandler (#10231)
* Replaced AbstractComponent ErrorHandler with ClientConnector level error handler. Now uses the same ErrorHandler as other parts of the framework.
* Made error handling hierarchical so that the error handler of the connector where the error occured or its ancestors is used. Falls back to VaadinSession ErrorHandler.
* Changed ErrorEvent to be a class as all other events in the framework
* Renamed ErrorListener to ErrorHandler and DefaultErrorListener to DefaultErrorHandler for consistency
* Unified error handling in AbstractCommunicationManager
* Unified error handling in VaadinServlet and VaadinPortlet
* Removed superfluous ErrorEvent implementations (#10232)
Change-Id: Ied518e05209fe54685f4bebab0709b1cd5584fd1
Renamed InitializableClientToServerRpc -> InitializableServerRpc and
moved it out from ServerRpc to avoid confusion (#8599)
It is now possible to use RpcProxy.create(class, Connector) before the
connector has been initialized