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rendering model, meaning that the control has self-contained logic for rending its UI. In other words, you have to programmatically add all the child controls and HTML layout required to work with and display the control without using an external markup file (for example, the .ascx file for a user control). Self-contained rendering logic allows the control to be packed and deployed in an assembly without the need for any additional files.

This chapter demonstrates the use of several log4j components in a real-life scenario. The configuration file used for these examples is in XML style because the Filter object and Renderer object can be configured only via XML style. This chapter also illustrates the simplicity and great extendibility of log4j. With simple components plugged in to the framework, log4j can achieve so much powerful logging. In the next chapter, we will examine how log4j fits into the J2EE world.

Figure 7-16. Date and Time Web Part in the catalog, its custom properties as seen in the PropertyGridEditor and on the page

Listing 7-24. Overriding the Render Method to Output a Custom Web Part UI '*************************************************************************** Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter) MyBase.Render(writer) 'Fully Object Oriented Approach writer.AddAttribute("id", "Div1") writer.AddAttribute("class", "MyDivClass") writer.AddStyleAttribute("border", "1px solid black") writer.AddStyleAttribute("font-weight", "bold") writer.RenderBeginTag(HtmlTextWriterTag.Div) 'Renders attributes in tag writer.Write("This appears in the 1st div") writer.RenderEndTag() 'Closes off the DIV tag started earlier writer.WriteBreak() 'Object Oriented/Text Approach writer.WriteBeginTag("div ") writer.WriteAttribute("id", "Div2") writer.WriteAttribute("class", "MyDivClass") writer.WriteAttribute("style", "border: 1px solid black") writer.Write(">") writer.Write("This appears in the 2nd div") writer.WriteEndTag("div") 'Text-Based Approach writer.Write("<br><div id=Div3 class=MyDivClass style=" & _ "'border: 1px solid black'>This appears in the 3rd div</div>") End Sub Outputting content using the HtmlTextWriter is a good idea when you have very little and/ or simple content requirements. It s also very fast, so if performance is a concern, this is the way to go as well. As complexity and content size grow, this approach becomes more and more unwieldy and difficult to maintain. Your second option is to override the CreateChildControls method. In the Create ChildControls method, you instantiate and configure child controls, add them to the controls collection of the Web Part, and then use those controls as you respond to page events (such as Load, PreRender, and so on). When the Web Part renders, it automatically renders all its child controls, so you don t have to worry about manually constructing the HTML for everything. Plus you have the added benefit of being able to leverage events and functionality from existing controls such as combo boxes, data grids, validators, and so on.

Android devices feature a trackball, which is cumbersome for mobile games. In fact, most gaming devices, such as PlayStation Portable (PSP) and Game Boy, feature multiple keypad arrows, which are great for navigation. On the plus side, the QWERTY keyboard is helpful for PC games. But the latest Android devices have neither a keyboard nor a trackball. Here is where the navigation controls can help. Figure 7-3 shows the navigation controls in action during a game.

Tip To respond to events for child controls, you have to declare a class-level field for the control using the

ith the coming of J2EE and J2EE-enabled containers, life has become simpler. Programmers can concentrate on programming the business and application logic, without wasting much time on low-level issues such as threading, concurrency, transaction, etc. On the other hand, life has also become more complex as the J2EE containers and application servers behave like a closed system and the basic J2EE container infrastructure works like black magic. It is important to understand how to package the log4j components in the context of a J2EE application. In this chapter, I will discuss the issues surrounding the use of log4j with J2EE applications and try to provide solutions to those problems.

WithEvents keyword. You must then set up event handlers in the WebPart class to respond to events from