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If you have an extremely large amount of data to display in a TreeView, you probably don t want to fill it in all at once. Not only will that increase the time taken to process the initial request for the page, it will also dramatically increase the size of the page and the view state. Fortunately, the TreeView includes a populate-on-demand feature that makes it easy to fill in branches of the tree as they are expanded. Even better, you can use populate-on-demand on selected portions of the tree, as you see fit. To use populate-on-demand, you set the PopulateOnDemand property to true for any TreeNode that has content you want to fill in at the last minute. When the user expands this branch, the TreeView will fire a TreeNodePopulate event, which you can use to add the next level of nodes. If you want, this level of nodes can contain another level of nodes that are populated on demand. Although the programming model remains fixed, the TreeView actually supports two techniques for filling in the on-demand nodes. When the TreeView.PopulateNodesFromClient property is true (the default), the TreeView performs a client-side callback to retrieve the nodes it needs from your event, without posting back the entire page. If PopulateNodesFromClient is false, or if it s true but the TreeView detects that the current browser doesn t appear to support client callbacks, the TreeView triggers a normal postback to get the same result. The only difference is that the entire page will be refreshed in the browser, generating a less seamless interface. (It also allows other page events to fire, such as control change events.)

For example, in Java-Flex development, an application container like Tomcat or Jetty is needed to test your web application Maven provides plug-ins for both of these containers, so you don t have to install them As I mentioned, I prefer to Jetty as I find it faster and lighter than Tomcat Note that the Maven Jetty plug-in is not a core plug-in; to use it you have to add the following XML to your POM XML file: <plug-in> <groupId>orgmortbayjetty</groupId> <artifactId>Maven-jetty-plug-in</artifactId> <version>6119</version> <configuration> <contextPath>/yourContextRoot</contextPath> <scanIntervalSeconds>4</scanIntervalSeconds> <scanTargetPatterns> <scanTargetPattern> <directory> src/main/webapp/WEB-INF </directory> <excludes> <exclude>**/*jsp</exclude> </excludes> <includes> <include>**/*properties</include> <include>**/*xml</include> </includes> </scanTargetPattern> </scanTargetPatterns> </configuration> </plug-in> The XML code tells Maven the version of the plug-in to use, the application context path, and other useful information needed by the Jetty plug-in in order to execute successfully To run the Jetty plug-in, simply type mvn jetty:run.

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34 has more information about how client callbacks work and how you can use them directly. However, the TreeView support is particularly nice because it hides the underlying model, allowing you to write an ordinary .NET event handler.

You can use the populate-on-demand feature with the previous example. Instead of filling the whole tree when the page loads, you would begin by adding just the category nodes and setting them to populate on demand: protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { DataTable dtCategories = GetCategories(); // Loop through the category records. foreach (DataRow row in dtCategories.Rows) { TreeNode nodeCategory = new TreeNode( row["CategoryName"].ToString(), row["CategoryID"].ToString()); // Use the populate-on-demand feature for this // node's children. nodeCategory.PopulateOnDemand = true; // Make sure the node is collapsed at first, // so it's not populated immediately. nodeCategory.Collapse(); TreeView1.Nodes.Add(nodeCategory); } } }

As we have discovered throughout this chapter, Android provides a rich set of capabilities for working with audio files. The capabilities it offers are implemented in a manner similar to those we have used with the image capture capabilities; specifically, we can use the built-in applications through an intent or create our own custom playback application. Also, the MediaStore has special capabilities for audio beyond querying for individual audio files we can use it to search and browse for audio based on artist, album, genre, and more. In the next chapter, we ll take this a step further and look at the world opened up by harnessing audio not stored on the device, but rather available via the Internet.

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