Activity
| com.google.gwt.activity.shared.Activity |
 Known Indirect Subclasses
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Class Overview
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.
Summary
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Called when the user is trying to navigate away from this activity.
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Called when
start(AcceptsOneWidget, EventBus) has not yet replied to its callback, but the
user has lost interest. | |||||||||||
Called when the Activity's widget has been removed from view.
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Called when the Activity should ready its widget for the user.
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Public Methods
public abstract String mayStop ()
Called when the user is trying to navigate away from this activity.
Returns
- A message to display to the user, e.g. to warn of unsaved work, or null to say nothing
public abstract void onCancel ()
Called when start(AcceptsOneWidget, EventBus) has not yet replied to its callback, but the
user has lost interest.
public abstract void onStop ()
Called when the Activity's widget has been removed from view. All event handlers it registered will have been removed before this method is called.
public abstract void start (AcceptsOneWidget panel, EventBus eventBus)
Called when the Activity should ready its widget for the user. When the
widget is ready (typically after an RPC response has been received),
receiver should present it by calling
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 addHandler(GwtEvent.Type.
Parameters
| panel | the panel to display this activity's widget when it is ready |
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| eventBus | the event bus |