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POGWT Editors - how to add N sub-editors of the same type based on a Collection
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  1. POGWT Editors - how to add N sub-editors of the same type based on a Collection
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    copied!<p>I have an object, <code>Supply</code>, that can either be an <code>ElecSupply</code> or <code>GasSupply</code> (<a href="https://stackoverflow.com/questions/13346308/how-to-implement-gwt-editors-for-subclasses-of-a-type">see related question</a>).</p> <p>Regardless of which subclass is being edited, they all have a list of <code>BillingPeriod</code>s.</p> <p>I now need to instantiate N number of <code>BillingPeriodEditor</code>s based on the contents of that list, and am pretty baffled as to how I should do it.</p> <p>I am using GWTP. Here is the code of the <code>SupplyEditor</code> I have just got working:</p> <pre><code>public class SupplyEditor extends Composite implements ValueAwareEditor&lt;Supply&gt; { private static SupplyEditorUiBinder uiBinder = GWT.create(SupplyEditorUiBinder.class); interface SupplyEditorUiBinder extends UiBinder&lt;Widget, SupplyEditor&gt; { } @Ignore final ElecSupplyEditor elecSupplyEditor = new ElecSupplyEditor(); @Path("") final AbstractSubTypeEditor&lt;Supply, ElecSupply, ElecSupplyEditor&gt; elecSupplyEditorWrapper = new AbstractSubTypeEditor&lt;Supply, ElecSupply, ElecSupplyEditor&gt;( elecSupplyEditor) { @Override public void setValue(final Supply value) { setValue(value, value instanceof ElecSupply); if(!(value instanceof ElecSupply)) { showGasFields(); } else { showElecFields(); } } }; @Ignore final GasSupplyEditor gasSupplyEditor = new GasSupplyEditor(); @Path("") final AbstractSubTypeEditor&lt;Supply, GasSupply, GasSupplyEditor&gt; gasSupplyEditorWrapper = new AbstractSubTypeEditor&lt;Supply, GasSupply, GasSupplyEditor&gt;( gasSupplyEditor) { @Override public void setValue(final Supply value) { setValue(value, value instanceof GasSupply); if(!(value instanceof GasSupply)) { showElecFields(); } else { showGasFields(); } } }; @UiField Panel elecPanel, gasPanel, unitSection; public SupplyEditor() { initWidget(uiBinder.createAndBindUi(this)); gasPanel.add(gasSupplyEditor); elecPanel.add(elecSupplyEditor); } // functions to show and hide depending on which type... @Override public void setValue(Supply value) { if(value instanceof ElecSupply) { showElecFields(); } else if(value instanceof GasSupply) { showGasFields(); } else { showNeither(); } } } </code></pre> <p>Now, as the list of BillingPeriods is a part of any Supply, I presume the logic for this should be in the SupplyEditor.</p> <p>I got some really good help on the thread <a href="https://groups.google.com/forum/?fromgroups=#!topic/gwt-platform/PWJTu1il2VY" rel="nofollow noreferrer"><strong>How to access PresenterWidget fields when added dynamically</strong></a>, but that was before I had implemented the Editor Framework at all, so I think the logic is in the wrong places.</p> <p>Any help greatly appreciated. I can post more code (Presenter and View) but I didn't want to make it too hard to read and all they do is get the Supply from the datastore and call edit() on the View.</p> <p>I have had a look at some <a href="http://c.gwt-examples.com/home/ui/listeditor" rel="nofollow noreferrer">examples of ListEditor</a> but I don't really get it!</p>
 

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