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As mentioned before, a skinned control consists of two decoupled components: a server control containing the business logic for the control and a series of UserControls containing the different visual interfaces. The question is, if they are decoupled, how can they work together The answer lies in coupling (or binding) them back together. Before we continue, understand that ASP.NET 2.0 includes no built-in support for skinned controls. You are responsible for implementing all the loading and binding functionality that is about to be discussed. You will, however, be implementing most of the functionality in a reusable base class that will make building skinned controls a much simpler task.

Listing 6-4 shows the way the game handles key and touch events within the main activity. When the user presses a key, onKeyDown first checks if the menu key has been pressed. It ignores the event if so. Otherwise, it translates the Android key code to a PC scan code with ScanCodes.keySymToScancode(keyCode) and sends it to the DSO using the Natives class key press. When the key is released, onKeyUp will be called performing similar steps as before. Menu keys are ignored, and the key code gets translated to a scan code and sent to the DSO as a key release event. When the screen is touched, onTouchEvent will be called. This method will send a CONTROL scan code to the DSO, which indicates the gun should be fired.

When you build a skinned control, the server control expects the UserControl skin to contain a specific set of ASP.NET server controls with specific ID values. When the server control loads the UserControl skin, it uses the FindControl method to reach into the UserControl skin and acquire references to the controls it needs based on the expected ID values. After those references have been acquired, the business logic in the server control can manipulate the controls and even handle their events on a postback. You can think of the expected ID values as a pseudocontract that exists between the UserControl skin and the server control. The server control does not care what is in the UserControl skin as long as it can find the controls necessary to run its business logic. If the server control cannot find those controls, it throws an exception. Figure 4-4 illustrates the concepts of expected ID values and coupling.

Figure 4-4. Shows the two portions of a skinned web control: the web control portion that defines the busines logic, and the skin file portion that defines the user interface

To illustrate this concept, let s reuse the program in Listing 4-1 with the configuration file for XMLLayout, xml.properties, defined in Listing 4-7. Listing 4-7. xml.properties #configuring the custom logger log4j.logger.com.apress.logging.log4j=DEBUG,FILE log4j.appender.FILE=org.apache.log4j.FileAppender log4j.appender.FILE.File=xmlLayout.xml log4j.appender.FILE.layout=org.apache.log4j.xml.XMLLayout log4j.appender.FILE.layout.LocationInfo=true

For the sake of discussion, let s say you want to create a login control that could be used in different areas of your website. It has two different visual styles. One style is meant to be the central focus of a page, such as on a login page. The other style is a more compact design meant to be displayed on a left- or right menu bar for quick login access. An example of how these styles, or UserControl skins, look is shown in Figure 4-5.

Listing 6-4. Event Handlers Within the Main Activity /** * Key down */ @Override public boolean onKeyDown(int keyCode, KeyEvent event) { // Ignore MENU if (keyCode == KeyEvent.KEYCODE_MENU) return false; try { int sym = ScanCodes.keySymToScancode(keyCode); Natives.keyPress(sym); } catch (UnsatisfiedLinkError e) { System.err.println(e.toString());

Figure 4-5 Large and small login skins for a skinned login control Although the two UserControl skins have different layouts and verbiage, they both contain the same server controls: a Username text box, a Password text box, a Login button, and a label to display a login error message They also expose the same functionality Users enter their credentials and then click on the Login button If the credentials are authenticated, then the login succeeds Otherwise, the error label displays a message informing the user of the login failure The only difference is the way the user interface (UI) is presented This is a scenario where a skinned control will definitely work Implementing this control as a skinned server control would require the following steps: 1 Create the business logic to validate a username and password against a data store 2.