Fix JComboBox width
Solution 1
Finally I found an easy solution:
jComboBox1.setPrototypeDisplayValue("XXXXXXXXXXXXXXXXXX");
And works perfect for what I wanted
Solution 2
NetBeans does this for you with a couple of checkboxes in the component's right-click context menu: Auto Resizing -> Horizontal and Vertical.
I turned them off and compared the NetBeans generated code in my revision control history. There were a surprising number of changes that I could not relate to the size of the component but I did see changes in how the combo box was added to it's containing layout group. essentially,
....addComponent(destinationFolderComboBox, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
was changed to
....addComponent(myComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, 514, javax.swing.GroupLayout.PREFERRED_SIZE)
JComboBox.setPreferredSize() is never explicitly called, so I assume you get better results from telling the layout manager the preferred size and re-size properties, rather than telling the JComboBox and hoping the layout manager reads those properties behind the scenes.
(by the way, by ....addComponent(), I mean addComponent() is called in a long, cascaded sequence of createParallelGroup() and createSequentialGroup(), starting with a new javax.swing.GroupLayout(myPanel). I presented the short form above because I didn't want to get into the nitty gritty of auto-generated NetBeans code, which I could not begin to write manually or explain. You want the whole thing? You can't handle the whole thing! here it is:
javax.swing.GroupLayout taskPanelLayout = new javax.swing.GroupLayout(taskPanel);
taskPanel.setLayout(taskPanelLayout);
taskPanelLayout.setHorizontalGroup(
taskPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(taskPanelLayout.createSequentialGroup()
.addContainerGap()
.addGroup(taskPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, taskPanelLayout.createSequentialGroup()
.addGroup(taskPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1)
.addGroup(taskPanelLayout.createSequentialGroup()
.addGroup(taskPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(tagModifierLabel, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1, javax.swing.GroupLayout.Alignment.LEADING))
.addGap(18, 18, 18)
.addGroup(taskPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(destinationFolderComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, 514, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(tagModifierTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 514, javax.swing.GroupLayout.PREFERRED_SIZE))))
.addGap(18, 18, 18)
.addGroup(taskPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(importFilesButton)
.addComponent(selectFilesButton)
.addComponent(clearFilesListButton)
.addComponent(commitChangesButton)))
.addGroup(taskPanelLayout.createSequentialGroup()
.addComponent(importFilesLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 103, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, Short.MAX_VALUE)))
.addContainerGap())
);
)
Comments
-
Roman Rdgz about 2 years
I have a JComboBox with some options. When I make a selection at another component, I'm changing JComboBox contents. First I call the
removeAllItems()method, and then I add one by one the Strings I need now.The problem is, by default I had some options, and one of them was the larger text, so JComboBox got the width it needed to show that option correctly. When I change the JComboBox contents, that text option is gone, and now a smaller text is giving the width to the JComboBox, so when I change contents it gets smaller.
My first approach was calling
myComboBox.setPreferredSize(myComboBox.getSize())and then its dimensions are fixed, but not correctly: it gets a bit smaller in height and width. I think it is because I'm using Nimbus Look&Feel, and the dimensions I'm getting from thegetSize()method are the ones given by the Java default Look%Feel.I also tried
myCombo.setPreferredSize(new Dimension(myCombo.getHeight(), myCombo.getWidth()))with same results.How can I approach this problem?
I add a code example of how I'm using 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's 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]); } } } }It's basically a GridBagLayout with 6 JPanel with a new GridBagLayout for each one of them. I just wrote jPanel1 here to simplify things. I hope it is not very messy.