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Although interface-based programming is a very powerful technique, implementing interfaces may entail a healthy amount of typing. Given that interfaces are a named set of abstract members, you are required to type in the definition and implementation for each interface method on each type that supports the behavior. As you would hope, Visual Studio 2010 supports various tools that make the task of implementing interfaces less burdensome. By way of a simple test, insert a final class into your current project named PointyTestClass. When you implement IPointy (or any interface for that matter), you might have noticed that when you complete typing the interface s name (or when you position the mouse cursor on the interface name in the code window), the first letter is underlined (formally termed a smart tag). When you click the smart tag, you will be presented with a drop-down list that allows you to implement the interface (see Figure 9-5).

We ve been looking at simple one-page forms. But you may need to have users fill out a form that dynamically displays elements on the form based on selections the user made as he or she filled out the form. The following example demonstrates how to display form elements dynamically as the user picks various options while filling out the form. Start by creating a directory in your site/all/modules/custom folder named form_example_dynamic. In that directory, create a form_example_dynamic.info file with the following information. name = Form Example Creating a Dynamic Form description = An example of a dynamic form. package = Pro Drupal Development core = 7.x files[]=form_example_dynamic.module Next create the form_example_dynamic.module file, and begin by placing the following header information in the file.

Notice you are presented with two options, the second of which (explicit interface implementation) will be examined in the next section. For the time being, select the first option and you ll see that Visual Studio 2010 has generated stub code (within a named code region) for you to update (note that the default implementation throws a System.NotImplementedException, which can obviously be deleted). namespace CustomInterface { class PointyTestClass : IPointy { #region IPointy Members public byte Points { get { throw new NotImplementedException(); } } #endregion } }

Note Visual Studio 2010 also supports extract interface refactoring, available from the Refactor menu. This allows you to pull out a new interface definition from an existing class definition.

< php /** * @file * An example of how to use the new #states Form API element, allowing * dynamic form behavior with very simple setup. */ With the header information in place, the next step is to create a menu item that a visitor can use to access the new form. The module provides a single menu entry that can be accessed via www.example.com/form_example_dynamic. /** * Implements hook_menu(). */ function form_example_dynamic_menu() { $items['form_example_dynamic'] = array( 'title' => t('Form Example Dynamic Form'), 'page callback' => 'drupal_get_form', 'page arguments' => array('form_example_dynamic_form'), 'access callback' => TRUE, 'type' => MENU_NORMAL_ITEM ); return $items; } With the menu complete, I m now ready to create the form. The first item displayed on the form is a series of three radio buttons that allow a site visitor to select a room type to reserve. function form_example_dynamic_form($form, &$form_state) { $form['room_type'] = array( '#type' => 'radios', '#options' => drupal_map_assoc(array(t('Study Room'), t('Small Conference Room'), t('Board Room'))), '#title' => t('What type of room do you require ') ); The next form item is a fieldset that contains details about the study room and uses the #states attribute to determine whether this item should be displayed on the page. The #states attribute sets whether the fieldset will be visible by examining the room_type radio buttons to see whether the Study Room option was selected. If the Study Room option was selected, then the value is set to true and the form will render the fieldset using jQuery. The syntax of the visibility test follows the syntax of using selectors in jQuery. In this case, we re looking at an input element (the radio buttons) named room_type. We re examining whether the value of the input is Study Room.