Package com.google.gwt.event.logical.shared

## Class BeforeSelectionEvent<T>

- java.lang.Object
- - com.google.web.bindery.event.shared.Event<H>
  - - com.google.gwt.event.shared.GwtEvent<BeforeSelectionHandler<T>>
    - - com.google.gwt.event.logical.shared.BeforeSelectionEvent<T>

- Type Parameters:
    `T` - the type about to be selected

      public class BeforeSelectionEvent<T>
      extends GwtEvent<BeforeSelectionHandler<T>>

  Represents a before selection event.

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class com.google.gwt.event.shared.GwtEvent

      `GwtEvent.Type<H>`

  - ### Constructor Summary

    Constructors
    Modifier | Constructor | Description
    --- | --- | ---
    `protected` | `BeforeSelectionEvent()` | Creates a new before selection event.

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `cancel()` | Cancel the before selection event.
    `protected void` | `dispatch​(BeforeSelectionHandler<T> handler)` | Should only be called by `HandlerManager`.
    `static <T> BeforeSelectionEvent<T>` | `fire​(HasBeforeSelectionHandlers<T> source, T item)` | Fires a before selection event on all registered handlers in the handler manager.
    `GwtEvent.Type<BeforeSelectionHandler<T>>` | `getAssociatedType()` | Returns the `Event.Type` used to register this event, allowing an `EventBus` to find handlers of the appropriate class.
    `T` | `getItem()` | Gets the item.
    `static GwtEvent.Type<BeforeSelectionHandler<?>>` | `getType()` | Gets the type associated with this event.
    `boolean` | `isCanceled()` | Has the selection event already been canceled?
    `protected void` | `setItem​(T item)` | Sets the item.

    - ### Methods inherited from class com.google.gwt.event.shared.GwtEvent

      `assertLive, getSource, isLive, kill, revive`

    - ### Methods inherited from class com.google.web.bindery.event.shared.Event

      `setSource, toDebugString, toString`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### BeforeSelectionEvent

          protected BeforeSelectionEvent()

      Creates a new before selection event.

  - ### Method Detail

    - #### fire

          public static <T> BeforeSelectionEvent<T> fire​(HasBeforeSelectionHandlers<T> source,
                                                         T item)

      Fires a before selection event on all registered handlers in the handler manager. If no such handlers exist, this method will do nothing.
      Type Parameters:
        `T` - the item type
      Parameters:
        `source` - the source of the handlers
        `item` - the item
      Returns:
        the event so that the caller can check if it was canceled, or null if no handlers of this event type have been registered

    - #### getType

          public static GwtEvent.Type<BeforeSelectionHandler<?>> getType()

      Gets the type associated with this event.
      Returns:
        returns the handler type

    - #### cancel

          public void cancel()

      Cancel the before selection event. Classes overriding this method should still call super.cancel().

    - #### getAssociatedType

          public final GwtEvent.Type<BeforeSelectionHandler<T>> getAssociatedType()

      Description copied from class: `Event`
      Returns the `Event.Type` used to register this event, allowing an `EventBus` to find handlers of the appropriate class.
      Specified by:
        `getAssociatedType` in class `GwtEvent<BeforeSelectionHandler<T>>`
      Returns:
        the type

    - #### getItem

          public T getItem()

      Gets the item.
      Returns:
        the item

    - #### isCanceled

          public boolean isCanceled()

      Has the selection event already been canceled?
      Returns:
        is canceled

    - #### dispatch

          protected void dispatch​(BeforeSelectionHandler<T> handler)

      Description copied from class: `GwtEvent`
      Should only be called by `HandlerManager`. In other words, do not use or call.
      Specified by:
        `dispatch` in class `GwtEvent<BeforeSelectionHandler<T>>`
      Parameters:
        `handler` - handler
      See Also:
        `EventBus.dispatchEvent(Event, Object)`

    - #### setItem

          protected final void setItem​(T item)

      Sets the item.
      Parameters:
        `item` - the item