| Package | Description |
|---|---|
| com.google.gwt.canvas.client |
Classes for HTML Canvas 2D support.
|
| com.google.gwt.event.dom.client |
Types related to DOM events.
|
| com.google.gwt.i18n.client |
Internationalization support for GWT applications.
|
| com.google.gwt.media.client |
Widgets for HTML Audio and Video support.
|
| com.google.gwt.touch.client | |
| com.google.gwt.user.client |
Fundamental user-interface classes used in client-side GWT code.
|
| com.google.gwt.user.client.ui |
Widgets, Panels, and other user-interface classes.
|
| com.google.gwt.user.datepicker.client |
The date picker widget and associated types.
|
| Class and Description |
|---|
| HasAllDragAndDropHandlers
This is a convenience interface that includes all drag and drop handlers
defined by the core GWT system.
|
| HasAllFocusHandlers
This is a convenience interface that includes all focus handlers defined by
the core GWT system.
|
| HasAllGestureHandlers
This is a convenience interface that includes all gesture handlers defined by
the core GWT system.
|
| HasAllKeyHandlers
Convenience interface used to implement all key handlers at once.
|
| HasAllMouseHandlers
This is a convenience interface that includes all mouse handlers defined by
the core GWT system.
|
| HasAllTouchHandlers
This is a convenience interface that includes all touch handlers defined by
the core GWT system.
|
| HasBlurHandlers
A widget that implements this interface provides registration for
BlurHandler instances. |
| HasClickHandlers
A widget that implements this interface provides registration for
ClickHandler instances. |
| HasDoubleClickHandlers
A widget that implements this interface provides registration for
DoubleClickHandler instances. |
| HasDragEndHandlers
A widget that implements this interface provides registration for
DragEndHandler instances. |
| HasDragEnterHandlers
A widget that implements this interface provides registration for
DragEnterHandler instances. |
| HasDragHandlers
A widget that implements this interface provides registration for
DragHandler instances. |
| HasDragLeaveHandlers
A widget that implements this interface provides registration for
DragLeaveHandler instances. |
| HasDragOverHandlers
A widget that implements this interface provides registration for
DragOverHandler instances. |
| HasDragStartHandlers
A widget that implements this interface provides registration for
DragStartHandler instances. |
| HasDropHandlers
A widget that implements this interface provides registration for
DropHandler instances. |
| HasFocusHandlers
A widget that implements this interface provides registration for
FocusHandler instances. |
| HasGestureChangeHandlers
A widget that implements this interface provides registration for
GestureChangeHandler instances. |
| HasGestureEndHandlers
A widget that implements this interface provides registration for
GestureEndHandler instances. |
| HasGestureStartHandlers
A widget that implements this interface provides registration for
GestureStartHandler instances. |
| HasKeyDownHandlers
A widget that implements this interface provides registration for
KeyDownHandler instances. |
| HasKeyPressHandlers
A widget that implements this interface provides registration for
KeyPressHandler instances. |
| HasKeyUpHandlers
A widget that implements this interface provides registration for
KeyUpHandler instances. |
| HasMouseDownHandlers
A widget that implements this interface provides registration for
MouseDownHandler instances. |
| HasMouseMoveHandlers
A widget that implements this interface provides registration for
MouseMoveHandler instances. |
| HasMouseOutHandlers
A widget that implements this interface provides registration for
MouseOutHandler instances. |
| HasMouseOverHandlers
A widget that implements this interface provides registration for
MouseOverHandler instances. |
| HasMouseUpHandlers
A widget that implements this interface provides registration for
MouseUpHandler instances. |
| HasMouseWheelHandlers
A widget that implements this interface provides registration for
MouseWheelHandler instances. |
| HasTouchCancelHandlers
A widget that implements this interface provides registration for
TouchCancelHandler instances. |
| HasTouchEndHandlers
A widget that implements this interface provides registration for
TouchEndHandler instances. |
| HasTouchMoveHandlers
A widget that implements this interface provides registration for
TouchMoveHandler instances. |
| HasTouchStartHandlers
A widget that implements this interface provides registration for
TouchStartHandler instances. |
| Class and Description |
|---|
| BlurEvent
Represents a native blur event.
|
| BlurHandler
Handler interface for
BlurEvent events. |
| CanPlayThroughEvent
Represents a native media can play through event.
|
| CanPlayThroughHandler
Handler interface for
CanPlayThroughEvent events. |
| ChangeEvent
Represents a native change event.
|
| ChangeHandler
Handler for
ChangeEvent events. |
| ClickEvent
Represents a native click event.
|
| ClickHandler
Handler for
ClickEvent events. |
| ContextMenuEvent
Represents a native context menu event.
|
| ContextMenuHandler
Handler for
ContextMenuEvent events. |
DomEvent
DomEvent is a subclass of GwtEvent that provides events that
underlying native browser event object as well as a subclass of DomEvent.Type
that understands GWT event bits used by sinkEvents(). |
| DomEvent.Type
Type class used by dom event subclasses.
|
| DoubleClickEvent
Represents a native double click event.
|
| DoubleClickHandler
Handler interface for
DoubleClickEvent events. |
| DragDropEventBase
Base class for drag and drop events.
|
| DragDropEventBase.DragSupportDetector
Detector for browser support of drag events.
|
| DragEndEvent
Represents a native drag end event.
|
| DragEndHandler
Handler interface for
DragEndEvent events. |
| DragEnterEvent
Represents a native drag enter event.
|
| DragEnterHandler
Handler interface for
DragEnterEvent events. |
| DragEvent
Represents a native drag event.
|
| DragHandler
Handler interface for
DragEvent events. |
| DragLeaveEvent
Represents a native drag leave event.
|
| DragLeaveHandler
Handler interface for
DragLeaveEvent events. |
| DragOverEvent
Represents a native drag over event.
|
| DragOverHandler
Handler interface for
DragOverEvent events. |
| DragStartEvent
Represents a native drag start event.
|
| DragStartHandler
Handler interface for
DragStartEvent events. |
| DropEvent
Represents a native drop event.
|
| DropHandler
Handler interface for
DropEvent events. |
| EndedEvent
Represents a native media ended event.
|
| EndedHandler
Handler interface for
EndedEvent events. |
| ErrorEvent
Represents a native error event.
|
| ErrorHandler
Handler interface for
ErrorEvent events. |
| FocusEvent
Represents a native focus event.
|
| FocusHandler
Handler interface for
FocusEvent events. |
| GestureChangeEvent
Represents a native gesture change event.
|
| GestureChangeHandler
Handler interface for
GestureChangeEvent events. |
| GestureEndEvent
Represents a native gesture end event.
|
| GestureEndHandler
Handler interface for
GestureEndEvent events. |
| GestureStartEvent
Represents a native gesture start event.
|
| GestureStartHandler
Handler interface for
GestureStartEvent events. |
| HasAllFocusHandlers
This is a convenience interface that includes all focus handlers defined by
the core GWT system.
|
| HasAllKeyHandlers
Convenience interface used to implement all key handlers at once.
|
| HasAllMouseHandlers
This is a convenience interface that includes all mouse handlers defined by
the core GWT system.
|
| HasAllTouchHandlers
This is a convenience interface that includes all touch handlers defined by
the core GWT system.
|
| HasBlurHandlers
A widget that implements this interface provides registration for
BlurHandler instances. |
| HasCanPlayThroughHandlers
A widget that implements this interface provides registration for
CanPlayThroughHandler instances. |
| HasDragEndHandlers
A widget that implements this interface provides registration for
DragEndHandler instances. |
| HasDragEnterHandlers
A widget that implements this interface provides registration for
DragEnterHandler instances. |
| HasDragHandlers
A widget that implements this interface provides registration for
DragHandler instances. |
| HasDragLeaveHandlers
A widget that implements this interface provides registration for
DragLeaveHandler instances. |
| HasDragOverHandlers
A widget that implements this interface provides registration for
DragOverHandler instances. |
| HasDragStartHandlers
A widget that implements this interface provides registration for
DragStartHandler instances. |
| HasDropHandlers
A widget that implements this interface provides registration for
DropHandler instances. |
| HasEndedHandlers
A widget that implements this interface provides registration for
EndedHandler instances. |
| HasFocusHandlers
A widget that implements this interface provides registration for
FocusHandler instances. |
| HasGestureChangeHandlers
A widget that implements this interface provides registration for
GestureChangeHandler instances. |
| HasGestureEndHandlers
A widget that implements this interface provides registration for
GestureEndHandler instances. |
| HasGestureStartHandlers
A widget that implements this interface provides registration for
GestureStartHandler instances. |
| HasKeyDownHandlers
A widget that implements this interface provides registration for
KeyDownHandler instances. |
| HasKeyPressHandlers
A widget that implements this interface provides registration for
KeyPressHandler instances. |
| HasKeyUpHandlers
A widget that implements this interface provides registration for
KeyUpHandler instances. |
| HasLoadedMetadataHandlers
A widget that implements this interface provides registration for
LoadedMetadataHandler instances. |
| HasMouseDownHandlers
A widget that implements this interface provides registration for
MouseDownHandler instances. |
| HasMouseMoveHandlers
A widget that implements this interface provides registration for
MouseMoveHandler instances. |
| HasMouseOutHandlers
A widget that implements this interface provides registration for
MouseOutHandler instances. |
| HasMouseOverHandlers
A widget that implements this interface provides registration for
MouseOverHandler instances. |
| HasMouseUpHandlers
A widget that implements this interface provides registration for
MouseUpHandler instances. |
| HasMouseWheelHandlers
A widget that implements this interface provides registration for
MouseWheelHandler instances. |
| HasNativeEvent
An object that implements this interface has a native event associated with
it.
|
| HasProgressHandlers
A widget that implements this interface provides registration for
ProgressHandler instances. |
| HasTouchCancelHandlers
A widget that implements this interface provides registration for
TouchCancelHandler instances. |
| HasTouchEndHandlers
A widget that implements this interface provides registration for
TouchEndHandler instances. |
| HasTouchMoveHandlers
A widget that implements this interface provides registration for
TouchMoveHandler instances. |
| HasTouchStartHandlers
A widget that implements this interface provides registration for
TouchStartHandler instances. |
| HumanInputEvent
Abstract class representing position events such as mouse or touch events.
|
| KeyCodeEvent
Key up and key down are both events based upon a given key code.
|
| KeyDownEvent
Represents a native key down event.
|
| KeyDownHandler
Handler interface for
KeyDownEvent events. |
| KeyEvent
Base class for Key events.
|
| KeyPressEvent
Represents a native key press event.
|
| KeyPressHandler
Handler interface for
KeyPressEvent events. |
| KeyUpEvent
Represents a native key up event.
|
| KeyUpHandler
Handler interface for
KeyUpEvent events. |
| LoadedMetadataEvent
Represents a native loadedmetadata event.
|
| LoadedMetadataHandler
Handler interface for
LoadedMetadataEvent events. |
| LoadEvent
Represents a native load event.
|
| LoadHandler
Handler interface for
LoadEvent events. |
| LoseCaptureEvent
Represents a native lose capture event.
|
| LoseCaptureHandler
Handler interface for
LoseCaptureEvent events. |
| MouseDownEvent
Represents a native mouse down event.
|
| MouseDownHandler
Handler interface for
MouseDownEvent events. |
| MouseEvent
Abstract class representing mouse events.
|
| MouseMoveEvent
Represents a native mouse move event.
|
| MouseMoveHandler
Handler interface for
MouseMoveEvent events. |
| MouseOutEvent
Represents a native mouse out event.
|
| MouseOutHandler
Handler interface for
MouseOutEvent events. |
| MouseOverEvent
Represents a native mouse over event.
|
| MouseOverHandler
Handler interface for
MouseOverEvent events. |
| MouseUpEvent
Represents a native mouse up event.
|
| MouseUpHandler
Handler interface for
MouseUpEvent events. |
| MouseWheelEvent
Represents a native mouse wheel event.
|
| MouseWheelHandler
Handler interface for
MouseWheelEvent events. |
| ProgressEvent
Represents a native media progress event.
|
| ProgressHandler
Handler interface for
ProgressEvent events. |
| ScrollEvent
Represents a native scroll event.
|
| ScrollHandler
Handler interface for
ScrollEvent events. |
| TouchCancelEvent
Represents a native touch start event.
|
| TouchCancelHandler
Handler interface for
TouchCancelEvent events. |
| TouchEndEvent
Represents a native touch end event.
|
| TouchEndHandler
Handler interface for
TouchEndEvent events. |
| TouchEvent
Abstract class representing touch events.
|
| TouchMoveEvent
Represents a native touch move event.
|
| TouchMoveHandler
Handler interface for
TouchMoveEvent events. |
| TouchStartEvent
Represents a native touch start event.
|
| TouchStartHandler
Handler interface for
TouchStartEvent events. |
| Class and Description |
|---|
| HasKeyUpHandlers
A widget that implements this interface provides registration for
KeyUpHandler instances. |
| KeyUpEvent
Represents a native key up event.
|
| KeyUpHandler
Handler interface for
KeyUpEvent events. |
| Class and Description |
|---|
| CanPlayThroughHandler
Handler interface for
CanPlayThroughEvent events. |
| EndedHandler
Handler interface for
EndedEvent events. |
| HasAllDragAndDropHandlers
This is a convenience interface that includes all drag and drop handlers
defined by the core GWT system.
|
| HasAllFocusHandlers
This is a convenience interface that includes all focus handlers defined by
the core GWT system.
|
| HasAllGestureHandlers
This is a convenience interface that includes all gesture handlers defined by
the core GWT system.
|
| HasAllKeyHandlers
Convenience interface used to implement all key handlers at once.
|
| HasAllMediaHandlers
This is a convenience interface that includes all media handlers defined by
the core GWT system.
|
| HasAllMouseHandlers
This is a convenience interface that includes all mouse handlers defined by
the core GWT system.
|
| HasAllTouchHandlers
This is a convenience interface that includes all touch handlers defined by
the core GWT system.
|
| HasBlurHandlers
A widget that implements this interface provides registration for
BlurHandler instances. |
| HasCanPlayThroughHandlers
A widget that implements this interface provides registration for
CanPlayThroughHandler instances. |
| HasClickHandlers
A widget that implements this interface provides registration for
ClickHandler instances. |
| HasDoubleClickHandlers
A widget that implements this interface provides registration for
DoubleClickHandler instances. |
| HasDragEndHandlers
A widget that implements this interface provides registration for
DragEndHandler instances. |
| HasDragEnterHandlers
A widget that implements this interface provides registration for
DragEnterHandler instances. |
| HasDragHandlers
A widget that implements this interface provides registration for
DragHandler instances. |
| HasDragLeaveHandlers
A widget that implements this interface provides registration for
DragLeaveHandler instances. |
| HasDragOverHandlers
A widget that implements this interface provides registration for
DragOverHandler instances. |
| HasDragStartHandlers
A widget that implements this interface provides registration for
DragStartHandler instances. |
| HasDropHandlers
A widget that implements this interface provides registration for
DropHandler instances. |
| HasEndedHandlers
A widget that implements this interface provides registration for
EndedHandler instances. |
| HasFocusHandlers
A widget that implements this interface provides registration for
FocusHandler instances. |
| HasGestureChangeHandlers
A widget that implements this interface provides registration for
GestureChangeHandler instances. |
| HasGestureEndHandlers
A widget that implements this interface provides registration for
GestureEndHandler instances. |
| HasGestureStartHandlers
A widget that implements this interface provides registration for
GestureStartHandler instances. |
| HasKeyDownHandlers
A widget that implements this interface provides registration for
KeyDownHandler instances. |
| HasKeyPressHandlers
A widget that implements this interface provides registration for
KeyPressHandler instances. |
| HasKeyUpHandlers
A widget that implements this interface provides registration for
KeyUpHandler instances. |
| HasLoadedMetadataHandlers
A widget that implements this interface provides registration for
LoadedMetadataHandler instances. |
| HasMouseDownHandlers
A widget that implements this interface provides registration for
MouseDownHandler instances. |
| HasMouseMoveHandlers
A widget that implements this interface provides registration for
MouseMoveHandler instances. |
| HasMouseOutHandlers
A widget that implements this interface provides registration for
MouseOutHandler instances. |
| HasMouseOverHandlers
A widget that implements this interface provides registration for
MouseOverHandler instances. |
| HasMouseUpHandlers
A widget that implements this interface provides registration for
MouseUpHandler instances. |
| HasMouseWheelHandlers
A widget that implements this interface provides registration for
MouseWheelHandler instances. |
| HasProgressHandlers
A widget that implements this interface provides registration for
ProgressHandler instances. |
| HasTouchCancelHandlers
A widget that implements this interface provides registration for
TouchCancelHandler instances. |
| HasTouchEndHandlers
A widget that implements this interface provides registration for
TouchEndHandler instances. |
| HasTouchMoveHandlers
A widget that implements this interface provides registration for
TouchMoveHandler instances. |
| HasTouchStartHandlers
A widget that implements this interface provides registration for
TouchStartHandler instances. |
| LoadedMetadataHandler
Handler interface for
LoadedMetadataEvent events. |
| ProgressHandler
Handler interface for
ProgressEvent events. |
| Class and Description |
|---|
| TouchEvent
Abstract class representing touch events.
|
| Class and Description |
|---|
| HasNativeEvent
An object that implements this interface has a native event associated with
it.
|
| Class and Description |
|---|
| BlurEvent
Represents a native blur event.
|
| BlurHandler
Handler interface for
BlurEvent events. |
| ChangeEvent
Represents a native change event.
|
| ChangeHandler
Handler for
ChangeEvent events. |
| ClickEvent
Represents a native click event.
|
| ClickHandler
Handler for
ClickEvent events. |
| DomEvent.Type
Type class used by dom event subclasses.
|
| DoubleClickHandler
Handler interface for
DoubleClickEvent events. |
| DragEndHandler
Handler interface for
DragEndEvent events. |
| DragEnterHandler
Handler interface for
DragEnterEvent events. |
| DragHandler
Handler interface for
DragEvent events. |
| DragLeaveHandler
Handler interface for
DragLeaveEvent events. |
| DragOverHandler
Handler interface for
DragOverEvent events. |
| DragStartHandler
Handler interface for
DragStartEvent events. |
| DropHandler
Handler interface for
DropEvent events. |
| ErrorEvent
Represents a native error event.
|
| ErrorHandler
Handler interface for
ErrorEvent events. |
| FocusEvent
Represents a native focus event.
|
| FocusHandler
Handler interface for
FocusEvent events. |
| GestureChangeHandler
Handler interface for
GestureChangeEvent events. |
| GestureEndHandler
Handler interface for
GestureEndEvent events. |
| GestureStartHandler
Handler interface for
GestureStartEvent events. |
| HasAllDragAndDropHandlers
This is a convenience interface that includes all drag and drop handlers
defined by the core GWT system.
|
| HasAllFocusHandlers
This is a convenience interface that includes all focus handlers defined by
the core GWT system.
|
| HasAllGestureHandlers
This is a convenience interface that includes all gesture handlers defined by
the core GWT system.
|
| HasAllKeyHandlers
Convenience interface used to implement all key handlers at once.
|
| HasAllMouseHandlers
This is a convenience interface that includes all mouse handlers defined by
the core GWT system.
|
| HasAllTouchHandlers
This is a convenience interface that includes all touch handlers defined by
the core GWT system.
|
| HasBlurHandlers
A widget that implements this interface provides registration for
BlurHandler instances. |
| HasChangeHandlers
A widget that implements this interface provides registration for
ChangeHandler instances. |
| HasClickHandlers
A widget that implements this interface provides registration for
ClickHandler instances. |
| HasDoubleClickHandlers
A widget that implements this interface provides registration for
DoubleClickHandler instances. |
| HasDragEndHandlers
A widget that implements this interface provides registration for
DragEndHandler instances. |
| HasDragEnterHandlers
A widget that implements this interface provides registration for
DragEnterHandler instances. |
| HasDragHandlers
A widget that implements this interface provides registration for
DragHandler instances. |
| HasDragLeaveHandlers
A widget that implements this interface provides registration for
DragLeaveHandler instances. |
| HasDragOverHandlers
A widget that implements this interface provides registration for
DragOverHandler instances. |
| HasDragStartHandlers
A widget that implements this interface provides registration for
DragStartHandler instances. |
| HasDropHandlers
A widget that implements this interface provides registration for
DropHandler instances. |
| HasErrorHandlers
A widget that implements this interface provides registration for
ErrorHandler instances. |
| HasFocusHandlers
A widget that implements this interface provides registration for
FocusHandler instances. |
| HasGestureChangeHandlers
A widget that implements this interface provides registration for
GestureChangeHandler instances. |
| HasGestureEndHandlers
A widget that implements this interface provides registration for
GestureEndHandler instances. |
| HasGestureStartHandlers
A widget that implements this interface provides registration for
GestureStartHandler instances. |
| HasKeyDownHandlers
A widget that implements this interface provides registration for
KeyDownHandler instances. |
| HasKeyPressHandlers
A widget that implements this interface provides registration for
KeyPressHandler instances. |
| HasKeyUpHandlers
A widget that implements this interface provides registration for
KeyUpHandler instances. |
| HasLoadHandlers
A widget that implements this interface provides registration for
LoadHandler instances. |
| HasMouseDownHandlers
A widget that implements this interface provides registration for
MouseDownHandler instances. |
| HasMouseMoveHandlers
A widget that implements this interface provides registration for
MouseMoveHandler instances. |
| HasMouseOutHandlers
A widget that implements this interface provides registration for
MouseOutHandler instances. |
| HasMouseOverHandlers
A widget that implements this interface provides registration for
MouseOverHandler instances. |
| HasMouseUpHandlers
A widget that implements this interface provides registration for
MouseUpHandler instances. |
| HasMouseWheelHandlers
A widget that implements this interface provides registration for
MouseWheelHandler instances. |
| HasScrollHandlers
A widget that implements this interface provides registration for
ScrollHandler instances. |
| HasTouchCancelHandlers
A widget that implements this interface provides registration for
TouchCancelHandler instances. |
| HasTouchEndHandlers
A widget that implements this interface provides registration for
TouchEndHandler instances. |
| HasTouchMoveHandlers
A widget that implements this interface provides registration for
TouchMoveHandler instances. |
| HasTouchStartHandlers
A widget that implements this interface provides registration for
TouchStartHandler instances. |
| KeyDownEvent
Represents a native key down event.
|
| KeyDownHandler
Handler interface for
KeyDownEvent events. |
| KeyPressEvent
Represents a native key press event.
|
| KeyPressHandler
Handler interface for
KeyPressEvent events. |
| KeyUpEvent
Represents a native key up event.
|
| KeyUpHandler
Handler interface for
KeyUpEvent events. |
| LoadEvent
Represents a native load event.
|
| LoadHandler
Handler interface for
LoadEvent events. |
| MouseDownEvent
Represents a native mouse down event.
|
| MouseDownHandler
Handler interface for
MouseDownEvent events. |
| MouseMoveEvent
Represents a native mouse move event.
|
| MouseMoveHandler
Handler interface for
MouseMoveEvent events. |
| MouseOutEvent
Represents a native mouse out event.
|
| MouseOutHandler
Handler interface for
MouseOutEvent events. |
| MouseOverEvent
Represents a native mouse over event.
|
| MouseOverHandler
Handler interface for
MouseOverEvent events. |
| MouseUpEvent
Represents a native mouse up event.
|
| MouseUpHandler
Handler interface for
MouseUpEvent events. |
| MouseWheelEvent
Represents a native mouse wheel event.
|
| MouseWheelHandler
Handler interface for
MouseWheelEvent events. |
| ScrollEvent
Represents a native scroll event.
|
| ScrollHandler
Handler interface for
ScrollEvent events. |
| TouchCancelHandler
Handler interface for
TouchCancelEvent events. |
| TouchEndHandler
Handler interface for
TouchEndEvent events. |
| TouchMoveHandler
Handler interface for
TouchMoveEvent events. |
| TouchStartHandler
Handler interface for
TouchStartEvent events. |
| Class and Description |
|---|
| HasAllDragAndDropHandlers
This is a convenience interface that includes all drag and drop handlers
defined by the core GWT system.
|
| HasClickHandlers
A widget that implements this interface provides registration for
ClickHandler instances. |
| HasDoubleClickHandlers
A widget that implements this interface provides registration for
DoubleClickHandler instances. |
| HasDragEndHandlers
A widget that implements this interface provides registration for
DragEndHandler instances. |
| HasDragEnterHandlers
A widget that implements this interface provides registration for
DragEnterHandler instances. |
| HasDragHandlers
A widget that implements this interface provides registration for
DragHandler instances. |
| HasDragLeaveHandlers
A widget that implements this interface provides registration for
DragLeaveHandler instances. |
| HasDragOverHandlers
A widget that implements this interface provides registration for
DragOverHandler instances. |
| HasDragStartHandlers
A widget that implements this interface provides registration for
DragStartHandler instances. |
| HasDropHandlers
A widget that implements this interface provides registration for
DropHandler instances. |