How to get the dimensions of the visible part of the JScrollPane-based window

Question

This JScrollPane based window is a top part of the JSplitPane.

getBounds(), getWidth(), getHeight() all return the full size of the window, including the invisible (scrollable) part.

I want to know the dimensions of the visible part only.

score 9 · Accepted Answer · answered May 06 '12 at 17:37

This is an example which print the height and width of the visible part only ,

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;

public class TestWidth {

    public static void main(String[] args) {

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JTextPane newsTextPane = new JTextPane();
        newsTextPane.setEditable(false);

        JScrollPane scrollPane = new JScrollPane(newsTextPane);

        frame.add(scrollPane);
        frame.setSize(300, 250);
        frame.setVisible(true);

        System.out.println("Height : " + scrollPane.getViewport().getSize().height + "\nWidth :" + scrollPane.getViewport().getSize().width);
    }
}

score 5 · Answer 2 · answered May 06 '12 at 17:26

5

you have look at JViewport, you can derive JViewport from JScrollPane

answered May 06 '12 at 17:26

mKorbel

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Unfortunately, I cannot change this class' code, I can only work with it. – Flot2011 May 06 '12 at 17:29
you can't to need any class' code, you needed only to extract JViewport and work with it – mKorbel May 06 '12 at 17:30

score 4 · Answer 3 · answered May 06 '12 at 17:37

I think you are looking for JComponent#getVisibleRect().

Returns the Component's "visible rectangle" - the intersection of this component's visible rectangle, new Rectangle(0, 0, getWidth(), getHeight()), and all of its ancestors' visible rectangles.

How to get the dimensions of the visible part of the JScrollPane-based window

3 Answers3