public interface CancelableEvent extends CancelState
When a cancelable event is raised, any listener may choose to cancel the operation. A descriptive message must be provided, explaining why the operation was canceled. If any listener cancels the operation, it will not be performed--even if other listeners did not cancel. In other words, if three listeners receive the event and only one of them cancels, the associated operation will be considered canceled.
cancel, isCanceled
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