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

HasKeyDownHandlers abstract class

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

abstract class HasKeyDownHandlers extends HasHandlers {
 /**
  * Adds a {@link KeyDownEvent} handler.
  *
  * @param handler the key down handler
  * @return {@link HandlerRegistration} used to remove this handler
  */
 HandlerRegistration addKeyDownHandler(KeyDownHandler handler);
}

Extends

HasHandlers > HasKeyDownHandlers

Subclasses

HasAllKeyHandlers

Methods

abstract HandlerRegistration addKeyDownHandler(KeyDownHandler handler) #

Adds a {@link KeyDownEvent} handler.

@param handler the key down 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