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Now you need to react to the TreeNodePopulate event to fill a category when it s expanded. In this example, only the on-populate nodes are categories. However, if there were several types, you would check the TreeNode.Depth to determine what type of node is being expanded. protected void TreeView1_TreeNodePopulate(object sender, TreeNodeEventArgs e) { int categoryID = Int32.Parse(e.Node.Value); DataTable dtProducts = GetProducts(categoryID); // Loop through the product records. foreach (DataRow row in dtProducts.Rows) { // Use the constructor that requires just text // and a nondisplayed value. TreeNode nodeProduct = new TreeNode( row["ProductName"].ToString(), row["ProductID"].ToString()); e.Node.ChildNodes.Add(nodeProduct); } } A given node is populated on-demand only once. After that, the values remain available on the client, and no callback is performed if the same node is collapsed and expanded.

Note The client-side callback feature can be tampered with, just like any posted data. For example, a malicious user could create a page that requests you to fill in an arbitrary CategoryID, even if you haven t added the category to the tree. If you are displaying a subset of data from a table that contains sensitive information, you should validate that the node is allowed before populating it.

Camera.ErrorCallback: Defines an onError method, which is called when a Camera error occurs. There are two constants that can be compared with the passed-in error code: CAMERA_ERROR_UNKNOWN and CAMERA_ERROR_SERVER_DIED. Camera.OnZoomChangeListener: Defines a method, onZoomChange, which is called when a smooth zoom (slow zoom in or out) is in progress or completed. This class and method were introduced in Android 2.2 (API level 8). Camera.ShutterCallback: Defines a method, onShutter, which is called at the moment an image is captured.

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This starts Jetty on port 8080 ( always be sure of what ports you are using) Jetty will continue to run until the plug-in is explicitly stopped, either by using the command <ctrl-c> or using the command-line Maven command mvn jetty:stop Another Maven plug-in you ll want to install is the Maven server plug-in I have often had to create a Flex-Java project using the ApacheDS LDAP server, but working on a team sharing a public LDAP server can be very messy I found it was not possible to create unit test classes for testing, adding, editing, and deleting LDAP users using the shared LDAP server without conflicts or errors The best solution I found was to use either a local installation of the ApacheDS or the Maven ApacheDS plug-in.

The TreeView has a fine-grained style model that lets you completely control its appearance. Each style applies to a type of node. Styles are represented by the TreeNodeStyle class, which derives from the more conventional Style class. As with other rich controls, the styles give you options to set background and foreground colors, fonts, and borders. Additionally, the TreeNodeStyle class adds the node-specific style properties shown in Table 16-10. These properties deal with the node image and the spacing around a node. Table 16-10. TreeNodeStyle Added Properties

The URL for the image shown next to the node The space (in pixels) between the current node and the node above and below The space (in pixels) between the top and bottom of the node text and border around the text The space (in pixels) between the left and right of the node text and border around the text The space (in pixels) between the last child node of an expanded parent node and the following sibling node

Let s go through the entire example. The following code is written to run on Android 2.2 and higher, but with minor changes, it should run on versions 1.6 and higher. The sections that require higher than 1.6 are noted with comments.

The TreeView does not support associating two pictures with a node, one for the collapsed state and one for the expanded state. However, you can change the appearance of the collapse/expand buttons rendered next to every node.

Because a TreeView is rendered using an HTML table, you can set the padding of various elements to control the spacing around text, between nodes, and so on. One other property that comes into play is TreeView.NodeIndent, which sets the number of pixels of indentation (from the left) in each subsequent level of the tree hierarchy. Figure 16-16 shows how these settings apply to a single node.

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