Ive looked for 2 days, i cant find this swing component

Question

im looking for the size of the rectangles used to draw parts of a JScrollBar.
ive tired get them through calculations based on the ratios of visable space in the JScrollPane...that dosent work.
today ive tried making the protected method getThumbBounds() in BasicScrollUI() public so that i could see the sweeeeet rectangle dimensions within, yet when i execute this code i get all zeros
//scroll is a JScrollPane
scroll.getVerticalScrollBar().setUI(new BasicScrollBarUI());               
BasicScrollBarUI ui = (BasicScrollBarUI) scroll.getVerticalScrollBar().getUI();
System.out.println(ui.getThumbBounds().toString()   ); do i need to validate or somthing?
how else could i get them?

Answer 1

First of all, if you want to controll two scroll bars
at once, you don't need to know any of its dimensions.
You should read up on models, views, and controllers
in swing. i did read up on them and found no other way. maby someone could give more specifics on how else to do it? besides i allready have the code to do it,its only a few lines, i just need those values
Secondly, you can subclass the
MetalScrollBarUI and create methods which return the
size of the scroll buttons, the track, and the
thumb.great idea, but will this work for all look and feels? the more abstract ScrollBarUI does not seem to offer generic methods for getting the track value.
also if i cant find a way to do it for all L&Fs, where can i find the WindowsScrollBarUI class? id rather subclass that then the metal, but only as a last resort. thanks