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As we ve noted, IBOutlets are only one of a few major types of connections that you can build into Interface Builder. You ve also seen delegate connections, which allow you to tie one object to another for purposes of delegation. You do this without ever setting the delegate property in Xcode: you link one object to the other in Interface Builder. The third major type of connection is the IBAction, which creates a connection that causes a method in your class file to be run whenever an action is sent to a UIControl. Building IBAction connections is almost exactly like building IBOutlet connections: you create a method declaration in the appropriate header file that uses IBAction as its return, and then you connect it to an appropriate action in Interface Builder; each object comes with all of the potential actions built in. Finally, in Xcode, you write the method that specifies what happens when the control is modified. We ll get into this in more depth in chapter 6.

Each time a hyperlink is clicked, a HyperlinkEvent is generated and each registered HyperlinkListener will be notified by its hyperlinkUpdate( ) method being called. Typically the hyperlinkUpdate( ) method implementation consists of code for displaying the clicked link in the JEditorPane. This is how the browser in this chapter handles hyperlink updates. HyperlinkEvent defines four methods that obtain information about the link: getDescription( ), getURL( ), getEventType( ), and getSourceElement( ). Each returns the indicated item. The methods used in this chapter are getURL( ), which returns a URL object corresponding to the link that was clicked, and getEventType( ), which returns a

Your Application (Process)

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In the last chapter, you built your first subclass: the labeledwebview class. You ll be building lots more subclasses in your SDK work, and you ll often want to connect them into Interface Builder so you can connect outlets and actions to them. How do you access these new classes in Interface Builder when they don t appear in the Library window It turns out that you need to use the Identity tab, which you ve already met (in figure 4.6). Table 4.2 outlines the two-step process. We say that you start the process with an appropriate object. For a totally new object, this will probably be the blank object; but if you re making a subclass of an existing object, you should start with the object you re subclassing from.

HyperlinkEvent.EventType object that specifies the type of the event. There are three possible event types: ACTIVATED, ENTERED, and EXITED. The only one used here is ACTIVATED, which means that a link has been clicked. Both HyperlinkEvent and HyperlinkListener are contained in javax.swing.event.

Table 4.2 Creating a new proxy object to link to in Interface Builder takes a couple of steps. Step 1. Create a new object. Description From the Controllers section of the Library, drag an appropriate object to the nib document window. Open the Identity inspector tab, and change the class name to your new class.

A critical section is a piece of code that protects shared resources from more than one thread accessing that section of code at a time. To enter a critical section, a thread must obtain a semaphore (which gives it permission to enter the critical section), access the resources, and then leave. While the thread is in the critical section, no other threads are allowed to access this section of code, as shown in Figure 3-4.

After you type your new subclass name into your object s Class field, things are automatically linked up. You ll use this technique in future chapters.

To illustrate the power of Java s built-in HTML-rendering functionality, the remainder of this chapter develops a simple Web browser called Mini Browser. Mini Browser provides basic Web browsing functionality, such as the ability to move forward and back. Because it uses the HTML-rendering capabilities of JEditorPane, it supports only HTML 3.2 at the time of this writing; thus there are some pages that it won't display properly if they are built using a newer HTML specification. Although Mini Browser has only minimal browsing functionality, it is easily enhanced. It can also serve as a starting point for your own application development. Figure 7-1 shows Mini Browser s window. At the top of the window there are buttons for moving back and forward through the list of pages that have been displayed in the browser. There is also a text field for entering the URL of a page to be displayed in the browser. After a URL has been entered in the text field, the Go button is used to load the page in the display part of the window.

Eventually, you ll want to do some initialization when an Interface Builder object is created. But if you try to build your setup into a standard init method, it won t work. As we ve mentioned, Interface Builder objects use a special init method called initWithCoder:. You must create it by hand, as follows:

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