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getting a JScrollPane to display its scrollbars

 
chinomso ikwuagwu
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Posts: 11
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public Object [] showDeleteTableOptions() {
Vector listData = getListData();// This retrieves a vector containing the options
listData.trimToSize();
int size = listData.size();

JCheckBox [] checkBoxes = new JCheckBox[size];

JPanel panel = new JPanel();
panel.setLayout(new GridLayout(size, 1));

for (int i=0; i< size; i++) {
checkBoxes[i] = new JCheckBox(listData.get(i).toString());
panel.add(checkBoxes[i]);
}
int dialogResult = JOptionPane.showOptionDialog(this, new JScrollPane(panel), " Select table(s) to delete",
JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE, null, okAllCancel, okAllCancel[0]);

if (dialogResult ==0 ) {// Process...}
}

Question. Why doesn't the JScrollPane's scrollbar show when the panel contains a large list which is almost the height of the screen.
 
marc weber
Sheriff
Posts: 11343
Java Mac Safari
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Moving to Swing forum...
 
Michael Dunn
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run this as is, then comment out the indicated line, and uncomment the block
run it again, then uncomment the preferredSize() line, and run it again

 
chinomso ikwuagwu
Greenhorn
Posts: 11
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Thanks! Learnt something new.
 
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