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The rationale for automated testing is the same as for Crystal, but XP has added the requirement that the unit tests must be written before the code that is to be tested. This approach helps the developers to write only the minimum amount of code needed to run the tests successfully. The code has no unnecessary features, and it is as simple as it could possibly be. This avoids the risk of creating messy and confusing code. The customer is also expected to create automated tests, but these will be acceptance tests to confirm that the software s features work the way they re supposed to. The project s progress can be measured by how many acceptance tests succeed at any given point in time. However, the customer rarely has the development skills required to create these tests, so the developers will normally do the technical work for them. The customer will then just define the output data that they expect would be produced from some carefully chosen input data, and the developers will create a test engine that submits these inputs and checks the resulting outputs.

For code in your InfoPath project to be called, it needs to be tied to an event. Events can be added by clicking the event buttons in the development ribbon. Each event will be registered as a delegate in the InternalStartup method. The class EventManager is used to bind event handlers to the different events. Events are divided into three categories: FormEvents, ControlEvents, and XmlEvents. Each of these categories is represented by an object of the same name. FormEvents are events that occur to the form, such as loading and saving. ControlEvents are events issued by special controls. For example, the ButtonEvent implements the Clicked event, which is handled as a control event. Whenever you add a button and want to handle the Clicked event using code, an event handler will be added to the ControlEvents. Finally, XmlEvents are used for anything that happens to the underlying XML structure of your form for example, when a field is changed. When changes are made to the XML data, events will be bubbled up through the data structure. Assume your schema has a group element group1 that contains a field element called test. Figure 15 21 shows the simple data schema for this example.

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Figure 15 21. Simple data schema used for the events example When you change the content of the field element test, the event handler of the test element will be called. After that, the Changed event of the group1 element will be raised. When working with XmlChange events, the XmlEventArgs object supplies detailed information about the change. You can retrieve the OldValue, which shows the value before the change, and the NewValue, which contains the value after the change. In addition, the member Site returns an XPathNavigator object that points to the element on which the change event is currently being handled. The element that is responsible for the change (in the preceding example, this is the test element) can be accessed using the sender object. This is also an XPathNavigator object that points to the element that was originally changed and caused the event to be passed upward through the hierarchy. Listing 15 12 shows how these events will be thrown. Each event simply displays a MessageBox that outputs the name of the event along with the name of the Site element and the name of the sender object. This example is built with an InfoPath Filler form template to keep it as simple as possible. The MessageBox is not available to web browser forms. Listing 15 12. Assigning Events in Form Code public partial class FormCode { public void InternalStartup() { // Register events

As the instructions in the figure say, to create a gradient stop, you click the Gradient bar after selecting a gradient brush at the top of the editor To remove a gradient stop, you drag it off of the Gradient bar Let s now introduce an additional tool to help customize a gradient s appearance: the Brush Transform tool, located in the Asset Manager on the left side of Expression Blend The Brush Transform tool allows you to change the orientation of, stretch, and move a gradient applied to an element visually on the Artboard or design surface in Expression Blend, resulting in a new gradient value in the XAML From an XAML perspective, when you use the Brush Transform tool, you are visually modifying the StartPoint and EndPoint of the gradient object.

EventManager.XmlEvents["/my:myFields"].Changed += new XmlChangedEventHandler(myFields_Changed); EventManager.XmlEvents["/my:myFields/my:group1"].Changed += new XmlChangedEventHandler(group1_Changed); EventManager.XmlEvents["/my:myFields/my:group1/my:test"].Changed += new XmlChangedEventHandler(test_Changed); } public void group1_Changed(object sender, XmlEventArgs e) { // Show a message box about the changes MessageBox.Show("group1_Changed: Site=" + e.Site.Name + " sender=" + ((XPathNavigator)sender).Name + "from " + e.OldValue + " -> " + e.NewValue); } public void test_Changed(object sender, XmlEventArgs e) { MessageBox.Show("test_Changed: Site=" + e.Site.Name + " sender=" + ((XPathNavigator)sender).Name); } public void myFields_Changed(object sender, XmlEventArgs e) { MessageBox.Show("myFields_Changed: Site=" + e.Site.Name + " sender=" + ((XPathNavigator)sender).Name); } } Table 15 5 shows all events that are available in browser-enabled forms. When working with InfoPath Filler, some additional events are available. Table 15 5. Events in Form Templates

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