I have a JComboBox with some options. When I make a selection in another component, I change the contents of the JComboBox. First, I call the removeAllItems() method, and then I add in order the lines that I need now.
The problem is that by default I had some parameters, and one of them was larger, so the JComboBox got the necessary width to correctly display this option. When I change the contents of the JComboBox, this text option disappears, and now the smaller text gives the width of the JComboBox, so when I change the contents, it becomes smaller.
My first approach was to call myComboBox.setPreferredSize(myComboBox.getSize()) , and then its dimensions were fixed but not correct: it gets a little smaller in height and width. I think this is because I use Nimbus Look & Feel, and the sizes that I get from the getSize() method are the default Look% Feel defaults.
I also tried myCombo.setPreferredSize(new Dimension(myCombo.getHeight(), myCombo.getWidth())) with the same results.
How can I approach this problem?
I am adding sample code as I use the layout:
private String[] comboEventDOutputStrings = { "Run", "Stop", "Pause", "Conditioning time", "Deposition time", "Equilibration time", "Measurement time"}; private String[] comboEventDInputStrings = { "Run", "Stop", "Pause"}; // The first String array is the default set of values. It obvious that the JComboBox will get smaller // when I change to the second array of contents //... JPanel pane = new JPanel(new GridBagLayout()); JPanel jPanelExterno = new JPanel(new GridBagLayout()); GridBagConstraints cExterna = new GridBagConstraints(); GridBagConstraints c = new GridBagConstraints(); Border loweredetched = BorderFactory.createEtchedBorder(EtchedBorder.LOWERED); jPanelExterno.setBorder(loweredetched); jPanelExterno.setName(""); cExterna.fill = GridBagConstraints.BOTH; cExterna.anchor = GridBagConstraints.NORTH; cExterna.gridx = 0; cExterna.gridy = 0; cExterna.insets = new Insets(10,10,5,5); JPanel jPanel1 = new JPanel(new GridBagLayout()); jPanel1.setBorder(loweredetched); jPanel1.setName("PIO 1"); jCheckBox1 = new JCheckBox("Enable"); jCheckBox1.setSelected(false); jCheckBox1.setName("1"); jCheckBox1.addActionListener(new PIOCheckListener()); c.fill = GridBagConstraints.BOTH; c.anchor = GridBagConstraints.NORTH; c.gridx = 0; c.gridy = 0; c.insets = new Insets(10,5,10,10); jPanel1.add(jCheckBox1, c); c.gridy++; c.insets = new Insets(5,10,5,5); JLabel label1 = new JLabel("IO Type"); jPanel1.add(label1, c); c.gridx++; c.insets = new Insets(5,5,5,10); combo1 = new JComboBox(comboIOTypeStrings); combo1.setEnabled(false); combo1.setSelectedIndex(0); combo1.setName("1"); combo1.addActionListener (new PIOComboListener()); jPanel1.add(combo1, c); c.gridy++; c.insets = new Insets(5,10,5,5); c.gridx=0; JLabel label2 = new JLabel("Active level"); jPanel1.add(label2, c); c.gridx++; c.insets = new Insets(5,5,5,10); combo2 = new JComboBox(comboActiveLevelStrings); combo2.setEnabled(false); combo2.setSelectedIndex(0); jPanel1.add(combo2, c); c.gridy++; c.insets = new Insets(5,10,5,5); c.gridx=0; JLabel label3 = new JLabel("Event"); jPanel1.add(label3, c); c.gridx++; c.insets = new Insets(5,5,10,10); combo3 = new JComboBox(comboEventDOutputStrings); combo3.setEnabled(false); combo3.setSelectedIndex(0); jPanel1.add(combo3, c); c.gridy++; c.insets = new Insets(5,10,5,5); c.gridx=0; JLabel label4 = new JLabel("Node"); jPanel1.add(label4, c); c.gridx++; c.insets = new Insets(5,5,10,10); combo4 = new JComboBox(comboNodeStrings); combo4.setEnabled(false); combo4.setSelectedIndex(0); jPanel1.add(combo4, c); jPanelExterno.add(jPanel1, cExterna); pioDialog.add(pane); pioDialog.pack(); pioDialog.setLocationRelativeTo(null); pioDialog.setVisible(true); //... } class PIOComboListener implements ActionListener{ @Override public void actionPerformed(ActionEvent a) { JComboBox cb = (JComboBox)a.getSource(); JComboBox target1 = null; JComboBox target2 = null; JComboBox target3 = null; switch(Integer.parseInt(cb.getName())){ case 1: target1 = combo2; target2 = combo3; target3 = combo4; break; default: Register.debug("PIODialog error: No target for comboBoxes"); break; } if(cb.getSelectedIndex()==2){ //Analog input target1.setEnabled(false); target2.setEnabled(false); target3.setEnabled(false); } else{ target1.setEnabled(true); target2.setEnabled(true); target3.setEnabled(true); target2.removeAllItems(); if(cb.getSelectedIndex()==0){ for(int i=0; i<comboEventDOutputStrings.length; i++) target2.addItem(comboEventDOutputStrings[i]); } else { for(int i=0; i<comboEventDInputStrings.length; i++) target2.addItem(comboEventDInputStrings[i]); } } } }
Basically this is a GridBagLayout with 6 JPanel with a new GridBagLayout for each of them. I just wrote jPanel1 here to simplify things. Hope this is not very dirty.