problems with fixing ScrollPaneLayout
I use a patch of a former subject of mine ( provided by Walter Laan (thanks!), but I just came across some problems with it.) The code below is almost identical to the solution on the former thread:import java.awt.*;
import javax.swing.*;
public class TestScrollPaneLayout {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
final JFrame frame = new JFrame("Test");
// use BorderLayout if you don't want the borders
final JPanel myPanel = new JPanel();
myPanel.setBorder(BorderFactory.createLineBorder(Color.pink));
myPanel.add(new JLabel(
"A nice label, oh wait its too long! (actually its too short, hence why i am adding this)"));
final JScrollPane scroll = new JScrollPane(myPanel,
JScrollPane.VERTICAL_SCROLLBAR_NEVER,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scroll.setLayout(new FixScrollPaneLayout());
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(new JLabel("Resize the frame to show/hide the scroll bar"),
BorderLayout.PAGE_START);
frame.getContentPane().add(scroll,
BorderLayout.PAGE_END);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public static class FixScrollPaneLayout extends ScrollPaneLayout {
@Override
public Dimension preferredLayoutSize(Container parent) {
Component view = getViewport().getView();
if(!(view instanceof Scrollable)) {
// if not Scrollable ViewPortLayout sets an explicit size
// which means ScrollPaneLayout ignores the view preferred size
// this workaround assume this is only called during layout
getViewport().setViewSize(view.getPreferredSize());
}
Dimension size = super.preferredLayoutSize(parent);
if ((hsb != null) && (hsbPolicy != HORIZONTAL_SCROLLBAR_NEVER)) {
if (hsbPolicy == HORIZONTAL_SCROLLBAR_ALWAYS) {
// size is OK
}
else {
boolean canScroll = true;
if (view instanceof Scrollable) {
canScroll = !((Scrollable)view).getScrollableTracksViewportWidth();
}
if (canScroll) {
Dimension viewSize = getViewport().getViewSize();
Dimension extentSize = getViewport().getPreferredSize();
if(viewSize.width > extentSize.width) {
// size is OK
}
else if(view.getPreferredSize().width > getViewport().getWidth()) {
// Fix it!
size.height += hsb.getPreferredSize().height;
}
}
}
}
return size;
}
}
}public void run() {
final JFrame frame = new JFrame("Test");
// use BorderLayout if you don't want the borders
final JPanel myPanel = new JPanel();
myPanel.setBorder(BorderFactory.createLineBorder(Color.pink));
myPanel.add(new JLabel(
"A nice label, oh wait its too long! (actually its too short, hence why i am adding this)"));
final JScrollPane scroll = new JScrollPane(myPanel,
JScrollPane.VERTICAL_SCROLLBAR_NEVER,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scroll.setLayout(new FixScrollPaneLayout());
JPanel footerPanel = new JPanel();
footerPanel.setLayout(new BorderLayout());
footerPanel.add( scroll, BorderLayout.PAGE_START);
footerPanel.add(new JLabel("footer : made by me!") , BorderLayout.PAGE_END);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(new JLabel("Resize the frame to show/hide the scroll bar"),
BorderLayout.PAGE_START);
frame.getContentPane().add(footerPanel,
BorderLayout.PAGE_END);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}If (view.getPreferredSize () .width > parent.getWidth ())
parent.getWidth () is not just, its allways the unmaximised (if you maximize) size or vice versa and only attaches to a manual resizing or revalidate/repaint, this isn't what happens in the example above, but his strange behavior still display...
I hope someone can help track down the problem
Thank you
Edition - to clarify only upward acts when optimize you a size that has a scroll bar or reduce to this dimension
You might want to try using revalidate():
frame.addWindowStateListener(new WindowAdapter() {
@Override public void windowStateChanged(final WindowEvent e) {
EventQueue.invokeLater(new Runnable() {
@Override public void run() {
System.out.println("windowStateChanged");
JFrame f = (JFrame)e.getWindow();
((JComponent)f.getContentPane()).revalidate();
}
});
}
});
Tags: Java
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