By John Anderson
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Additional info for Appcelerator Titanium Up and Running
It’s an easy way to send information to anyone who has subscribed, or set up listeners to receive events without having to know ahead of time what those listeners are. Custom Events | 45 CHAPTER 5 Becoming a Capable Control Freak Controls are the way mobile users do things with their devices, such as pressing buttons, choosing items from option lists, and navigating among tabs. One of Titanium’s great advantages in comparison with some other environments that produce native apps is that Titanium uses native controls.
Figure 4-6. Basic event Custom Events Now that we’ve seen some basic events, we can look at creating our own events. Custom events are just like a built-in event on the listener side. You set up a listener as you would for any other event. The difference is that you also need to fire the event yourself, whereas built-in events are fired automatically. The point of having a custom event is when you want to broadcast some information to listeners that may have subscribed to this event. It is a bit like calling a subroutine, except you don’t need to know anything about the routine being called, other than the parameters passed into the routine.
This is a good time to point out that many Titanium objects, such as views, support an add method that allows you to add new objects. The tabGroup object and the NavigationGroup are two exceptions that have different syntax. open(); With a simple open method call, we’re able to finally see our app. This command opens up the Tab Group and makes it visible with the two tabs. Once it’s visible, you can tap on the tabs to reveal the appropriate windows. Since we know there is a label on each window, we can see that the correct window is indeed opening up when we click the tab.
Appcelerator Titanium Up and Running by John Anderson