JTable/JScrollPane horizontal scrolling problem


In a JApplet, I have a JTable embedded into a JScrollPane and I want to be able to scroll the table horizontally and vertically. The vertical scrolling works perfectly well, but I can't get the horizontal scrolling to work. The horizontal scrollbar appears but has no index, altough the columns spread past the rightmost limit of the scrollpane. Any ideas?

Here is my JTable/JScrollPane creation code (the table model is very simple and contains 12 text columns) :

getContentPane().setLayout(null) ;

m_table = new JTable(m_model) ;

for (int iCol = 0 ; iCol < m_model.getColumnCount() ; iCol++)
m_table.getColumnModel().getColumn(iCol).setMinWidth(200) ;

JScrollPane scrollPane = new JScrollPane(
m_table.setPreferredScrollableViewportSize(new Dimension(1600, 700)) ;
scrollPane.setBounds(0,0,1150,498) ;

getContentPane().add(scrollPane) ;
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What happens on removing this?:

>>getContentPane().setLayout(null) ;
This works fine:

getContentPane().setLayout(new BorderLayout());
getContentPane().add(scrollPane,BorderLayout.CENTER) ;
Of course, if you're adding to a JFrame, the above code is redundant, but as I mentioned earlier, the problem is likely caused by your removing the layout manager.
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I've checked it. RootLayout is good enough. CEHJ is right.
Mick BarryJava DeveloperCommented:
> m_table.setPreferredScrollableViewportSize(new Dimension(1600, 700)) ;

As you are using a fixed size table this line is redundant.

To get your horizontal scroll pane you just need to turn off auto column resizing:

JTable m_table = new JTable(m_model) ;
for (int iCol = 0 ; iCol < m_model.getColumnCount() ; iCol++)
   m_table.getColumnModel().getColumn(iCol).setMinWidth(200) ;

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stsanzAuthor Commented:
Mick BarryJava DeveloperCommented:
Unless you have a very good reason, calculating your own layouts is not a good idea. Try running your code on another OS and you'll see what I mean.
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