Java - How can I change a JScrollBar's buttons dynamically?

Question

I've overridden BasicScrollBarUI, but I don't know how to change the buttons after they've been created. How could I do this? Thanks.

Are you overriding `createDecreaseButton` and `createIncreaseButton` methods and create your custom in it then return them? Which things in button do you want to change after creation? UI of button? — Harry Joy, Dec 27 '11 at 06:14
Yeah I am overriding these methods but they create a new button and return it. An option could be to create class variables that point to the returned buttons, and modify them. I just want to change the colors - creating an inverted color theme. — rtheunissen, Dec 27 '11 at 06:29
See [MetalScrollBarUI](http://www.java2s.com/Open-Source/Java-Document/6.0-JDK-Core/swing/javax/swing/plaf/metal/MetalScrollBarUI.java.htm) implementation. The buttons are members of the class and can be updated later. — tenorsax, Dec 27 '11 at 06:52

score 2 · Answer 1 · answered Dec 27 '11 at 05:13

2

If you mean how to register your implementation of ScrollBarUI then this should help you:

UIManager.put("ScrollBarUI", YourScrollbarUI.class.getName());

answered Dec 27 '11 at 05:13

tenorsax

At the moment all I have is `scrollPane.getVerticalScrollBar().setUI(new CustomScrollBarUI());` But once I've created the UI object, I can't see how I can update or modify it after I've created it. – rtheunissen Dec 27 '11 at 05:18
@paranoid-android You can also try: getVerticalScrollBar().getUI() – tenorsax Dec 27 '11 at 05:32
I can reference it fine, but not sure how to update / reinstall. – rtheunissen Dec 27 '11 at 05:38
After you call UIManger.put(....) try this `SwingUtilities.updateComponentTreeUI(frame); frame.pack();` – Dimitry Dec 27 '11 at 20:10

score 2 · Accepted Answer · answered Dec 27 '11 at 20:12

I think you need to do something like this:

UIManager.put("ScrollBarUI", YourScrollbarUI.class.getName());
SwingUtilities.updateComponentTreeUI(frame); 
frame.pack();

Take a look at this link for more information of how to update the Look and Feel. Look and Feel

2 Answers2