I wanted to know do events have a priority in being fired or they are fired in the order they were registered?
For example I have a table and has two events on it,SelectionChanged and MouseClick,which one fires first if I click on a row?
See the class EventQueue. This class has all what you need, including the origin event (mouse or key event) for your selection event.
if the order of firing the events is important for You, just set up a chain of listeners, ie Listener one will notify listener two etc, so you could handle the order.
Also check this for more information:
Another question
personally, I think Observer pattern is usefully for your,it's deserved.
Related
im trying to build an app with http://reactivex.io/ in JAVA
regarding io.reactivex.Observable;
I have two observables, one of them is a checkbox change event type and the other is a mousemove to capture the cordinates.
I want to combine those two in one observable and then call the subscribe to log the cordinates (done).
My problem is, I would like to wait to the checkbox to be checked in order to add the dom listener of the mousemove observable.
How can i handle this with the observable operators?
Thanks!
I have a JTextPane that has a DocumentListener waiting for changes to the underlying HTML document. When the content changes, the event uses JTextPane.scrollToReference to move the view to a certain reference anchor. The problem is that the underlying View in the JTextPane is also listening to the document changes, and doesn't update until after my listener executes, which causes an exception. Is there any way I can force my DocumentListener to execute after any other event listeners for that particular event? Or is there some way I can wait for the view to be updated before executing my code?
First try to use SwingUtilities.invokeLater() for the listener that has to be executed as last. If that doesn't work, build your own priority queue.
Document is model fro JTextComponents, then not good idea put there two or more Listeners wrote changes to the Document,
all event should be done if model invoke all implemented event to the view, then only if are all events done in the view, then is possible moving with JViewport
no idea whats Listener you are implemented, but DocumentListener (e.g.) with FocusListener (e.i.) can creating endless loop with nice exception from RepaintManager
remove Listener that generating exceptions, add Listener if is really required, remove uselles Listeners immediatelly,
Swing quite no guarentee ordering of Listeners, nor events from multiplayed Listeners betweens model_to_view and vice versa
you can testing if Listeners firing events subsequently or gradually by pushing of required event from Swing Action (delayed from Swing Timer) or for asynchronous Listeners (freezed) by Thread.sleep(int)
I wound up having to extend the Viewport and JScrollPane classes to accomplish this. I exposed a listener for the viewport's change event and added my logic in there (which ensured it was the last code executed in the rendering chain).
I have a JPanel with a set of items (for example combo boxes and text fields). Some action listeners are implemented on those items to register user updates.
If the user selects a value in a JComboBox (for example), the action listener captures the event. The corresponding underlying bean method is called and the panel is refreshed. Changing can have an impact on other fields displayed in the pane.
The problem is that when the panel is refreshed, all listeners are triggered, and they call for a refresh themselves. This leads to an infinite loop.
How can I avoid this? I can't get rid of the listeners, because I need to capture user updates, but I don't want these to fire when I am only refreshing the panel content.
One option is to have a central boolean value or some indicator that each listener can check to prevent the chaining of events.
Another option is to not refresh the field if the value does not change. That way each component is updated at most once per refresh.
I can't get rid of the listeners, because I need to capture user updates, but I don't want these to fire when I am only refreshing the pane content
Then remove the listeners, refresh the pane content and then restore the listeners. This way the listeners only fire when a user change is made.
I think that if your problem is in combobox it just points to a bug. Really, if user changes the value of the combobox, that somehow triggers refresh of the pane the value of the combo box should not be changed second time! So if it is onValueChanged() (or something like this) it should not be called at all when pane is being refreshed.
But if for some reason it happens you can verify whether the old and new values are the same and exit the listener.
If this still does not help I'd suggest you some non-standard solution: try to investigate the stack trace into the listener. Can you identify whether the listener was called as a direct reaction to user's action or after the pane refresh? In this case you can create utility method and put it in the beginning of all relevant listeners.
My applications also suffered from this problem, and solution with the flag, that I should check in every listener and enable/disable in code, feels not very good for me. I always forgot to set this flag to true/false in necessary places.
That is why I decide to implement another solution.
I just subclass all default swing components that I am using often, and implemented custom ValueChanged event that I fire after mouse/keyboard/clipboard/etc events. Now I am always know, that if ValueChanged event is fired, it means, that value was issued by user, not by code. Event handling in this way much more cleaner. This solution solves my problem.
Is there anyway that I can control the order in which events are fired in my Swing application?
For example, I have a MouseListener and an ActionListener for a component. Can I make it so the MouseListener always fires before the ActionListener?
Seems to me if I add the MouseListener before the ActionListner, I am just praying that they will fire in that order.
Now I understand that coding this way is bad practice and that you should not count on the order of events firing, but for this situation I am encountering, it is a must.
Thanks
If you have an action triggered off of a one listener that needs to happen before the other then change your logic.
Either combine the listeners so that a single listener gets both events and holds onto one temporarily if needed. Or only add one listener and have it call the appropriate method or create a new event after it finishes.
Wrap the ActionListener code in a SwingUtilities.invokeLater(...). The code will be added to the end of the EDT.
I would still have both listeners in the same class so the dependency is well documented.
I have a bunch of JTextComponents that fire update events to a common model. The model then fires out change events to the other components so they can all be in synch. How can I detect which one fired the event initially so as not to fire the event back? I ask this as I'm currently getting an expection due to attemtping to update the component that fired the event.
There should be a getSource method on the event object. Use that to obtain a reference to the component that originally fired the event. You can then skip that component when distributing the event.