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public interface Activity
Implemented by objects that control a piece of user interface, with a life
cycle managed by an ActivityManager
, in response to
PlaceChangeEvent
events as the user
navigates through the app.
Method Summary | |
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java.lang.String |
mayStop()
Called when the user is trying to navigate away from this activity. |
void |
onCancel()
Called when start(com.google.gwt.user.client.ui.AcceptsOneWidget, com.google.gwt.event.shared.EventBus) has not yet replied to its callback, but the
user has lost interest. |
void |
onStop()
Called when the Activity's widget has been removed from view. |
void |
start(AcceptsOneWidget panel,
EventBus eventBus)
Called when the Activity should ready its widget for the user. |
Method Detail |
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java.lang.String mayStop()
void onCancel()
start(com.google.gwt.user.client.ui.AcceptsOneWidget, com.google.gwt.event.shared.EventBus)
has not yet replied to its callback, but the
user has lost interest.
void onStop()
void start(AcceptsOneWidget panel, EventBus eventBus)
AcceptsOneWidget.setWidget(IsWidget)
on the given panel.
Any handlers attached to the provided event bus will be de-registered when
the activity is stopped, so activities will rarely need to hold on to the
HandlerRegistration
instances returned by EventBus.addHandler(com.google.gwt.event.shared.GwtEvent.Type
.
panel
- the panel to display this activity's widget when it is readyeventBus
- the event bus
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