What is the best way to handle events (enable or disable button) or share parameters across different windows that are opened of the same applet ?
I am not referring to the browser window, instead (run as applet) window in the local IDE.
Which can be the best method to handle this scenario and let the other window know that the event has occurred already and proceed to the next step ? Here, there are no multiple applets. Just one applet, one code base, but multiple instances created.
Java uses a model, view, controller system. The model would be the variables under the hood, the view would be the applet, and the controller would be the buttons and other interactions. Many of the Swing components take a variable(model) in the constructor and automatically update with that. If you want to alert a specific function that a variable has been changed by any button, use property change listeners.
http://docs.oracle.com/javase/tutorial/uiswing/events/propertychangelistener.html
Related
I'm looking for a program, application, or some way to examine a java application, and be able to view its GUI information. This would include buttons, labels, panels, and list information. Ideally you could examine things by using the mouse pointer, and either hovering over an object or clicking on it. The separate program or application could display things like type of object, object name, and position of object in a console or a window.
I've found some applications that can examine a java application if it's using the Java Access Bridge, but I'm looking for a way that does not require the target java application to have the JAB.
Java Native Interface (JNI) allows you to get mouse clicks, positioning, and keyboard presses, but it does not appear to return information, like button names, inside a java application. Any ideas?
Answers to this question will be highly subjective, depending on the type of GUI technology used and the personal views of the answering person.
That being said, when I do JavaFX development, I use ScenicView. It works really well in my experience and can be loaded a number of different ways. It has most of the features you mentioned and displays a ton of data about the GUI objects, as well as highlighting the selected object's boundaries.
I want to make all Windows open in a Java swing application sharing same language InputMethod, that is, changing InputMethod in one window will result InputMethod changing in every other Window.
I have tried to create a single global InputContext and override getInputContext() of each window to return that Context, but it's not working reliably for some language input methods. Any idea?
I need to add a functionality in my application that would require me to know when the user changes window (it could be a browser window, my application's window or any other window).
Ideally, it should be possible for me to print the window's title when it gets focus. The problem I'm having finding a solution to this problem is that I only get links that tell me how to add a focus listener on windows I'm creating, which I already know how to do and doesn't help me in the slightest.
The solution should at least work on Windows 7.
The (major) problem you face is that Java filters system events so that you can only recieve events that are related to you. AFAIK this is all done at a native level, so there's no way to intercept or modify this filtering process.
The only solution is to create another "event loop" using JNI/JNA which will allow you to intercept the event messages being passed about the system and handle them the way you want to.
While slightly more complicated, it does open up a world of opportunities...
I am working with JFrame and observers. I have a functioning GUI with multiple buttons and functions.
I am trying to create a button which opens a new window, that is exactly the same as the main window. All changes in any window, should be automatically updated to all open windows.
Any help how to begin?
General suggestions:
Use Model-View-Control or MVC design pattern,
use a factory method to create your sub-views (or as you call them, windows), createWindow(Model model), and
give each sub-view the same shared model object.
I'm working with the eclipse SWT toolkit, and I'm trying to use it to create a browser window that only passes mouse clicks to the underlying document conditionally (I want to stop Flash and Javascript in the page from getting clicks). I'd like some way of doing one of:
Examining mouse events as they come in, and only passing them on to other listeners based on conditions I specify.
Removing all listeners from a window, and only putting back the ones I want.
Are either of these possible?
Browser, like other SWT components, have addMouseListener method. So you could implement your own listener a pass only which one you want.
see javadoc of browser
Edit
According to your request, there could be two possible ways to do it.
First, you could use listening of events from JavaScript in browser (there is no way to avoid JavaScript if you work with html pages). If you know that you will have Mozilla browser render core (you have to install XUL Runner), you could use JavaXPCOM, but that's big unknown for me.
snippet - listen for DOM mousedown events with javascript
Second, you can call Java functions from JavaScript (again, handle onclick event, and then decide on Java, if you don't want to use JavaScript for it).
snippet - call Java from JavaScript
But frankly both ways are more ugly-er that proposed way by pure JavaScript.