HasDragStartHandlers abstract class / dart_web_toolkit_event Library / API Reference / Dart Web Toolkit

HasDragStartHandlers abstract class

A widget that implements this interface provides registration for {@link DragStartHandler} instances.

Experimental API: This API is still under development and is subject to change.

abstract class HasDragStartHandlers extends HasHandlers {
 /**
  * Adds a {@link DragStartEvent} handler.
  *
  * @param handler the drag start handler
  * @return {@link HandlerRegistration} used to remove this handler
  */
 HandlerRegistration addDragStartHandler(DragStartHandler handler);
}

Extends

HasHandlers > HasDragStartHandlers

Subclasses

HasAllDragAndDropHandlers

Methods

abstract HandlerRegistration addDragStartHandler(DragStartHandler handler) #

Adds a {@link DragStartEvent} handler.

@param handler the drag start handler @return {@link HandlerRegistration} used to remove this handler

abstract void fireEvent(DwtEvent event) #

inherited from HasHandlers

Fires the given event to the handlers listening to the event's type.

Any exceptions thrown by handlers will be bundled into a UmbrellaException and then re-thrown after all handlers have completed. An exception thrown by a handler will not prevent other handlers from executing.

@param event the event