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Figure 31-5. Animation at last! That wraps up your look at WPF dependency properties. While I hope you have a much better idea about what these constructs allow you to do and have a better idea of how to make your own, please be aware that there are many details I have not covered here. If you find yourself in a position where you are building a number of custom controls which support custom properties, please look up the topic "Properties" under the "WPF Fundamentals" node of the .NET Framework 4.0 SDK documentation. Here, you will find many more examples of building dependency properties, attached properties, various ways to configure property metadata, and a slew of other details.

Properties are not the only NET programming construct to be given a facelift in order to work well within the WPF API The standard CLR event model has also been refined just a bit to ensure that events can be processed in a manner that is fitting for XAML s description of a tree of objects Assume you have a new WPF Application project named WPFRoutedEvents Now, update the XAML description of the initial window by adding the following <Button> control which defines some complex content: <Button Name="btnClickMe" Height="75" Width = "250" Click ="btnClickMe_Clicked"> <StackPanel Orientation ="Horizontal"> <Label Height="50" FontSize ="20">Fancy Button!</Label> <Canvas Height ="50" Width ="100" > <Ellipse Name = "outerEllipse" Fill ="Green" Height ="25" Width ="50" Cursor="Hand" CanvasLeft="25" CanvasTop="12"/> <Ellipse Name = "innerEllipse" Fill ="Yellow" Height = "15" Width ="36" CanvasTop="17" Canvas.

The block constants (like menu constants) can be used together using PHP bitwise operators. For example, the Book navigation block provided by the book module s implementation of hook_block_info() uses both DRUPAL_CACHE_PER_ROLE and DRUPAL_CACHE_PER_PAGE:

Left="32"/> </Canvas> </StackPanel> </Button> Notice in the <Button> s opening definition you have handled the Click event by specifying the name of a method to be called when the event is raised The Click event works with the RoutedEventHandler delegate, which expects an event handler that takes an object as the first parameter and a SystemWindowsRoutedEventArgs as the second Implement this handler as so: public void btnClickMe_Clicked(object sender, RoutedEventArgs e) { // Do something when button is clicked MessageBoxShow("Clicked the button"); } If you run your application, you will see this message box display, regardless of which part of the button s content you click on (the green Ellipse, the yellow Ellipse, the Label or the Button's surface) This is a good thing.

Imagine how tedious WPF event handling would be if you were forced to handle a Click event for each and every one of these sub-elements Not only would the creation of separate event handlers for each aspect of the Button be labor intensive, you would end up with some mighty nasty code to maintain down the road Thankfully, WPF routed events take care of ensuring that your single Click event handler will be called regardless of which part of the button is clicked automatically Simply put, the routed events model automatically propagates an event up (or down) a tree of objects, looking for an appropriate handler Specifically speaking, a routed event can make use of three routing strategies If an event is moving from the point of origin up to other defining scopes within the object tree, the event is said to be a bubbling event.

/** * Implements hook_block_info(). */ function book_block_info() { $block = array(); $block['navigation']['info'] = t('Book navigation'); $block['navigation']['cache'] = DRUPAL_CACHE_PER_PAGE | DRUPAL_CACHE_PER_ROLE; } return $block;

Conversely, if an event is moving from the outermost element (eg, a Window) down to.

the point of origin, the event is said to be a tunneling event. Finally, if an event is raised and handled only by the originating element (which is what could be described as a normal CLR event), it is said to be a direct event.

The DRUPAL_CACHE_PER_ROLE and DRUPAL_CACHE_PER_USER constants should not be combined with the bitwise OR operator (|), as the two caching modes are mutually exclusive.