![]() ![]() TopComponent componentToTrack = TheTopComponent.getInstance() TopComponent implements LookupProvider Lookup.Template tpl = new Lookup.Template (APIObject.class) To do this you might expect something like: private Lookup.Result result = null But regardless, sometimes you would like to listen to just the lookup of a single window. (Somehow the built in properties panel avoid this problem I don’t know what they do). As soon as you click into your custom component, the focus changes, and the lookup now points to a different object (or none at all), meaning you can’t edit the properties you were trying to. Why would you want to do that? Say you are writing a custom control which somehow edits aspects of the object(s) returned by the lookup returned by Utilities.actionsGlobalContext(). ![]() The tutorial does not show how you would listen to the Lookup of just a single topcomponent. ![]() When the Files menu is focused, details of the currently selected node are provided So if user clicks from editor window to an output window, you can react to this. Rather than keeping track of which windows have focus and reacting to this, you can instead use a Lookup that proxies whatever window has focus. I’m not going to repeat what is said in the tutorial, but I do want to point out one gotcha that had me hung up for awhile. The section in the book did not do it justice going through the tutorials methodically did the trick. There is a concept of a Lookup in the NetBeans Platform which is just a map from Class to the set of instances of that class it is used extensively in NBP and understanding it is extremely important. I highly recommend the NetBeans Platform Learning Trail, particularly the series of tutorials starting with Managing Selection. For instance, there are oftentimes you must add dependencies to your project that the book omits. Sometimes you need to be handheld through the process of doing something the first few times, and the book just omitted too many steps. I purchased a book to learn the NetBeans Platform, but I was getting nowhere with it. This is the first in what’s sure to be a series of lessons I’ve learned while working in the NetBeans Platform. With such a powerful and complex API to learn, there are bound to be stumbling blocks. You can create standalone desktop clients using all the same features of the NetBeans editor (syntax highlighting, robust docking framework, property editors, etc.), without having to worry about coding all these complex features from scratch. Fortunately the hard work that went into the NetBeans IDE can be leveraged by average users through the use of the NetBeans Platform (NBP for brevity here). I find it extremely powerful and capable it is the program I spend most of my day working in. Starting by a skeletal interface and ended by specialized GUI as well as a an efficient application if your specialized classes were well written.As I stated in a previous post, NetBeans is my IDE of choice. To sum it all up, you customize the netbeans IDE and the developed packages to fit your application. This gives a high level flexibility and re-usability. To be more clear, Imagine, you want to design an interface for a wordprocessor application, what you need in you application in terms of user interaction, is already available as well-developed packages, what you have to "add" is your specific classes and, what you want to learn is how to integrate you classes in the Netbeans Platform. ![]() With this modular platform you can build your application on top of Netbeans IDE. It combines the power of Java code, flexibility of swing, and the knowledge of Netbeans' developers. Designing everything from scratch is no longer an option. I can say, roughly, Netbeans Platform is the future of Graphical User Interface (GUI). ![]()
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