Michael Bayne
8a4c46badc
changed to Presents and Party changed to Crowd. Whee! git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@431 542714f4-19e9-0310-aa3c-eee0fc999fb1
59 lines
2.5 KiB
Java
59 lines
2.5 KiB
Java
//
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// $Id: PlaceView.java,v 1.5 2001/10/11 04:07:51 mdb Exp $
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package com.threerings.crowd.client;
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import com.threerings.crowd.data.PlaceObject;
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/**
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* This interface provides a convenient means for decoupling user
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* interface components that interact with a place object and that need to
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* keep themselves up to date when the client moves from place to place.
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*
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* <p> In general, such components need to know when the client is about
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* to enter a place so that they can subscribe if necessary or at least
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* extract information about the place. They also need to know when a
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* client has left a place so that they can unsubscribe and clean up after
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* themselves. This is the information that the place view interface makes
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* available to them in a decoupled way.
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*
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* <p> The part of the client implementation that is responsible for the
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* main user interface can act as a location observer, and it can make use
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* of {@link PlaceViewUtil} to dispatch notification of place changes to
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* every <code>PlaceView</code> implementing user interface element in the
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* user interface hierarchy with calls to {@link
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* PlaceViewUtil#dispatchWillEnterPlace} and {@link
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* PlaceViewUtil#dispatchDidLeavePlace}. These functions traverse the UI
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* hierarchy (starting with the element provided which would generally be
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* the top-level UI element, and dispatch calls to {@link #willEnterPlace}
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* and {@link #didLeavePlace} respectively on any UI element they find
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* that implements <code>PlaceView</code>.
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*
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* <p> By doing this, the client code can simply create place-sensitive
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* user interface elements and stick them in the user interface and
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* essentially forget about them, knowing that they will all be notified
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* of place entering and exiting by virtue of the single dispatching
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* calls. It is useful to note that place-sensitive user interface
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* elements will also generally need a reference to the {@link
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* com.threerings.crowd.util.CrowdContext} derivative in use by
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* the client, but those are best supplied at construct time.
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*/
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public interface PlaceView
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{
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/**
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* Called when the client has entered a place and is about to display
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* the user interface for that place.
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*
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* @param plobj the place object that was just entered.
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*/
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public void willEnterPlace (PlaceObject plobj);
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/**
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* Called after the client has left a place and needs to clean up
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* after the user interface that was displaying that place.
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*
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* @param plobj the place object that was just left.
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*/
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public void didLeavePlace (PlaceObject plobj);
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}
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