base interface for all event listeners interfaces.
Description
This 重要な handler is 類似の to XKeyListener but 許すs the
消費 of 重要な events. If a 重要な event is 消費するd by one
handler both the に引き続いて handlers, with 尊敬（する）・点 to the 名簿（に載せる）／表（にあげる） of 重要な
handlers of the 放送者, and a に引き続いて 扱うing by the
放送者 will not take place.
This 機能（する）／行事 is called by the 放送者, an XExtendedToolkit for
instance, after a 重要な has been 圧力（をかける）d but before it is 解放（する）d.
The return value decides about whether other handlers will be
called and a 扱うing by the 放送者 will take place.
This 機能（する）／行事 is called by the 放送者, an XExtendedToolkit for
instance, after a 重要な has been 圧力（をかける）d and 解放（する）d. The return
value decides about whether other handlers will be called and a
扱うing by the 放送者 will take place.
This 機能（する）／行事 is called by the 放送者, an XExtendedToolkit for
instance, after a 重要な has been 圧力（をかける）d but before it is 解放（する）d.
The return value decides about whether other handlers will be
called and a 扱うing by the 放送者 will take place.
消費する the event if the 活動／戦闘 成し遂げるd by the 実施
is 相互に 排除的 with the default 活動／戦闘 of the 放送者 or,
when known, with that of other handlers.
消費するing this event does not 妨げる the 未解決の 重要な-解放（する）
event from beeing broadcasted.
Parameter aEvent
The 重要な event 知らせるs about the 圧力（をかける）d 重要な.
Returns
When 誤った is returned the other handlers are called and a
に引き続いて 扱うing of the event by the 放送者 takes place.
さもなければ, when true is returned, no other handler will be
called and the 放送者 will take no その上の 活動／戦闘s
regarding the event.
This 機能（する）／行事 is called by the 放送者, an XExtendedToolkit for
instance, after a 重要な has been 圧力（をかける）d and 解放（する）d. The return
value decides about whether other handlers will be called and a
扱うing by the 放送者 will take place.
消費する the event if the 活動／戦闘 成し遂げるd by the 実施
is mutualy 排除的 with the default 活動／戦闘 of the 放送者 or,
when known, with that of other handlers.
Parameter aEvent
The 重要な event 知らせるs about the 圧力（をかける）d 重要な.
Returns
When 誤った is returned the other handlers are called and a
に引き続いて 扱うing of the event by the 放送者 takes place.
さもなければ, when true is returned, no other handler will be
called and the 放送者 will take no その上の 活動／戦闘s
regarding the event.
