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    <p>I think the "correct" way to do this is to use the Scrollable interface:</p> <pre><code>public class ScrollPaneWidthTrackingPanel extends JPanel implements Scrollable { private static final long serialVersionUID = 1L; public ScrollPaneWidthTrackingPanel(LayoutManager layoutManager) { super(layoutManager); } public Dimension getPreferredScrollableViewportSize() { return getPreferredSize(); } public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction) { return Math.max(visibleRect.height * 9 / 10, 1); } public boolean getScrollableTracksViewportHeight() { return false; } public boolean getScrollableTracksViewportWidth() { return true; } public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction) { return Math.max(visibleRect.height / 10, 1); } } </code></pre> <p>Two lines of your code then have to change to:</p> <pre><code>final ScrollPaneWidthTrackingPanel bigPane = new ScrollPaneWidthTrackingPanel(new GridLayout(0, 1)); frame.setContentPane(new JScrollPane(bigPane)); </code></pre> <p>And the components should always fill the entire width of the JScrollPane, whatever the size of the frame. This change has a side effect that the components will now not fill the height of the JScrollPane. To solve that add the following code to the top of the getScrollableTracksViewportHeight method:</p> <pre><code>if (getParent() instanceof JViewport) { JViewport viewport = (JViewport) getParent(); return component.getPreferredSize().height &lt; viewport.getHeight(); } </code></pre>
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    1. POHow to layout a components in vertical only scrollpane?
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    1. USRuss Hayward
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    1. COI really read the Scrollable javadoc too fast. Clearly, what I want is in public boolean getScrollableTracksViewportWidth() { return true; } Thank you, very much.
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    2. COTechnically I have swingx already used in my project, I will use a JXPanel and call panel.setScrollableTracksViewportHeight(false); on it. That will avoid the rest of the custom code.
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