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Here is repaired code. Now JScrollPane should be (400,400) - variable mainSize. Also I changed LayoutManager of JScrollPane to SpringLayout which is, I think, most suitable for me.

Now calling...

I don't understand what You want to do...?

The goal is to make all three steps in one button click - somehow force to repaint once or wait when full repaint is finished.

First click:

Red JPanel i moving down by 50 and resizes to (1000, 300)

Second click:

Horizontal scrollbar moves to 50% of scrollbar length

Third click:

OK. I simplify the problem.

Please compile program below and tell me why program is setting correct position of JPanel and JScrollPanel scrollbars after 3 clicks of button. It should take one...

Hello! [Please go to second post in this thread first]

First of all, in attachments is SSCCE program which shows main problem.

You should complie it with (after going to folder javatest_SSCCE):...