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WPF also provides controls for advanced document processing, allowing you to build applications that incorporate Adobe PDF-style functionality. Using the types within the System.Windows.Documents namespace (also in the PresentationFramework.dll assembly), you can create print-ready documents that support zooming, searching, user annotations (sticky notes), and other rich text services. Under the covers, however, the document controls do not use Adobe PDF APIs; rather, they use the XML Paper Specification (XPS) API. To the end user, there will really appear to be no difference because PDF documents and XPS documents have an almost identical look-and-feel. In fact, you can find many free utilities that allow you to convert between the two file formats on the fly. You ll work with some aspects of the document controls in an upcoming example.

WPF also provides you with a few common dialog boxes such as OpenFileDialog and SaveFileDialog. These dialog boxes are defined within the Microsoft.Win32 namespace of the PresentationFramework.dll assembly. Working with either of these dialog boxes is a matter of creating an object and invoking the ShowDialog() method: using Microsoft.Win32; namespace WpfControls { public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private void btnShowDlg_Click(object sender, RoutedEventArgs e) { // Show a file save dialog. SaveFileDialog saveDlg = new SaveFileDialog(); saveDlg.ShowDialog(); } } } As you would hope, these classes support various members that allow you to establish file filters and directory paths, and gain access to user-selected files. You will put these file dialogs to use in later examples; you will also learn how to build custom dialog boxes to gather user input.

Drupal has a built-in mechanism for highlighting form elements that fail validation and displaying an error message to the user. Examine the validation function in our example to see it at work:

Despite what you might be thinking, the intent of this chapter is not to walk through each and every member of each and every WPF control. Rather, you will receive an overview of the various controls with an emphasis on the underlying programming model and key services common to most WPF controls. You will also learn how to build UIs with Expression Blend and Visual Studio 2010. To round out your understanding of the particular functionality of a given control, be sure to consult the .NET Framework 4.0 SDK documentation specifically, the Control Library section of the help system, which you can find under Windows Presentation Foundation Controls (see Figure 28-3).

Figure 28-3. The full details of each WPF control are just a keypress away (F1) Here you will find full details of each control, various code samples (in XAML, as well as C#), and information regarding a control s inheritance chain, implemented interfaces, and applied attributes.

/** * Validate the form. */ function formexample_nameform_validate($form, &$form_state) { if ($form_state['values']['user_name'] == 'King Kong') { // We notify the form API that this field has failed validation. form_set_error('user_name', t('King Kong is not allowed to use this form.')); } } Note the use of form_set_error(). When King Kong visits our form and types in his name on his giant gorilla keyboard, he sees an error message at the top of the page, and the field that contains the error has its contents highlighted in red, as shown in Figure 11-6.

A WPF application invariably contains a good number of UI elements (e.g., user input controls, graphical content, menu systems, and status bars) that need to be well organized within various windows. Once you place the UI elements, you need to make sure they behave as intended when the end user resizes the window or possibly a portion of the window (as in the case of a splitter window). To ensure your WPF controls retain their position within the hosting window, you can take advantage of a good number of panel types. When you declare a control directly inside a window that doesn t use panels, the control is positioned dead-center in the container. Consider the following simple window declaration, which