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POGWT: How to programmatically reload CellBrowser?
 

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  1. POGWT: How to programmatically reload CellBrowser?
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    <p>I'm using GWT 2.1's <a href="http://google-web-toolkit.googlecode.com/svn/javadoc/2.1/index.html?overview-summary.html" rel="noreferrer">CellBrowser</a> with a custom <code>TreeViewModel</code>. The TreeViewModel in turn uses an <code>AsyncDataProvider</code> to fetch data dynamically. This all works beautifully- when the user clicks on a node my AsyncDataProvider fetches the results via RPC, and the CellBrowser dutifully displays them.</p> <p>I feel silly for not being able to figure this out, but how can I programmatically tell the CellBrowser to reload (and display) the data? I'm guessing that I need to somehow get a handle to the AsyncDataProvider for my root node and then call updateRowData() &amp; updateRowCount() on it, but I don't see an obvious way to query the browser (or its model) for the root DataProvider.</p> <p>I guess I could add code to my AsyncDataProvider constructor that looks for a null argument, and by that means recognize "hey, I'm the root" and store a reference somewhere, but that seems hackish. Surely there's a better way to do this.</p> <p>Apologies for dumping so much code here, but I don't know how to boil this down to anything simpler and still provide enough context.</p> <p><strong>My AsyncDataProvider:</strong></p> <pre><code>private static class CategoryDataProvider extends AsyncDataProvider&lt;Category&gt; { private Category selectedCategory; private CategoryDataProvider(Category selectedCategory) { this.selectedCategory = selectedCategory; } @Override protected void onRangeChanged(HasData&lt;Category&gt; display) { new AsyncCall&lt;List&lt;Category&gt;&gt;() { @Override protected void callService(AsyncCallback&lt;List&lt;Category&gt;&gt; cb) { // default to root String categoryId = "-1"; if (selectedCategory != null) { categoryId = selectedCategory.getCategoryId(); } // when a category is clicked, fetch its child categories service.getCategoriesForParent(categoryId, cb); } @Override public void onSuccess(List&lt;Category&gt; result) { // update the display updateRowCount(result.size(), true); updateRowData(0, result); } }.go(); } } </code></pre> <p><strong>My model:</strong></p> <pre><code>private static class CategoryTreeModel implements TreeViewModel { private SingleSelectionModel&lt;Category&gt; selectionModel; public CategoryTreeModel(SingleSelectionModel&lt;Category&gt; selectionModel) { this.selectionModel = selectionModel; } /** * @return the NodeInfo that provides the children of the specified category */ public &lt;T&gt; NodeInfo&lt;?&gt; getNodeInfo(T value) { CategoryDataProvider dataProvider = new CategoryDataProvider((Category) value); // Return a node info that pairs the data with a cell. return new TreeViewModel.DefaultNodeInfo&lt;Category&gt;(dataProvider, new CategoryCell(), selectionModel, null); } /** * @return true if the specified category represents a leaf node */ public boolean isLeaf(Object value) { return value != null &amp;&amp; ((Category) value).isLeafCategory(); } } </code></pre> <p><strong>And finally, here's how I'm using them:</strong></p> <pre><code> CategoryTreeModel model = new CategoryTreeModel(selectionModel); CellBrowser cellBrowser = new CellBrowser(model, null); </code></pre>
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