Problem with JTable.doLayout()
I'm trying to extend JTable so I can have weighted column widths. To do so I have overriddenJTable.doLayout(). It works perfect except the program flow never reachessetValue() of the table model and I can't understand why not.
Can any of you shed some light on this?
Thanks.
Test program:publicclass TestFrameextends javax.swing.JFrame{
public TestFrame(){
initComponents();
MyTable jTable1 =new MyTable();
jTable1.setModel(new MyTableModel());
jTable1.setPreferredWidths(newint[]{1, 1, 2});
jScrollPane1.setViewportView(jTable1);
setSize(400, 200);
setLocationRelativeTo(null);
}
privatevoid initComponents(){
buttonGroup1 =new javax.swing.ButtonGroup();
jPanel1 =new javax.swing.JPanel();
jLabel1 =new javax.swing.JLabel();
jRadioButton1 =new javax.swing.JRadioButton();
jRadioButton2 =new javax.swing.JRadioButton();
jScrollPane1 =new javax.swing.JScrollPane();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("Weighted column widths");
jPanel1.add(jLabel1);
buttonGroup1.add(jRadioButton1);
jRadioButton1.setSelected(true);
jRadioButton1.setText("on");
jRadioButton1.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));
jRadioButton1.setMargin(new java.awt.Insets(0, 0, 0, 0));
jRadioButton1.addActionListener(new java.awt.event.ActionListener(){
publicvoid actionPerformed(java.awt.event.ActionEvent evt){
jRadioButton1ActionPerformed(evt);
}
});
jPanel1.add(jRadioButton1);
buttonGroup1.add(jRadioButton2);
jRadioButton2.setText("off");
jRadioButton2.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));
jRadioButton2.setMargin(new java.awt.Insets(0, 0, 0, 0));
jRadioButton2.addActionListener(new java.awt.event.ActionListener(){
publicvoid actionPerformed(java.awt.event.ActionEvent evt){
jRadioButton2ActionPerformed(evt);
}
});
jPanel1.add(jRadioButton2);
getContentPane().add(jPanel1, java.awt.BorderLayout.NORTH);
getContentPane().add(jScrollPane1, java.awt.BorderLayout.CENTER);
pack();
}
privatevoid jRadioButton2ActionPerformed(java.awt.event.ActionEvent evt){
useWeighted = jRadioButton1.isSelected();
}
privatevoid jRadioButton1ActionPerformed(java.awt.event.ActionEvent evt){
useWeighted = jRadioButton1.isSelected();
}
publicstaticvoid main(String args[]){
java.awt.EventQueue.invokeLater(new Runnable(){
publicvoid run(){
new TestFrame().setVisible(true);
}
});
}
private javax.swing.ButtonGroup buttonGroup1;
private javax.swing.JLabel jLabel1;
private javax.swing.JPanel jPanel1;
private javax.swing.JRadioButton jRadioButton1;
private javax.swing.JRadioButton jRadioButton2;
private javax.swing.JScrollPane jScrollPane1;
privateboolean useWeighted =true;
class MyTableModelextends javax.swing.table.DefaultTableModel{
public MyTableModel(){
super(new Object[][]{{ null, null, null,null},{ null, null, null,null}},
new String[]{"Title 1","Title 2","Title 3","Title 4"});
}
@Override
publicvoid setValueAt(Object aValue,int row,int column){
super.setValueAt(aValue, row, column);
System.out.println("Setting value=" + aValue +" at (" + row +", " + column +")");
}
}
class MyTableextends javax.swing.JTable{
privateint[] weights;
publicvoid setPreferredWidths(int[] weights){
this.weights = weights;
}
@Override
publicvoid doLayout(){
if (tableHeader !=null && getTableHeader().getResizingColumn() !=null){
System.out.println("Resizing column");
super.doLayout();
}elseif (weights ==null || weights.length == 0){
System.out.println("no weights defined");
super.doLayout();
}else{
if (useWeighted){
System.out.println("doing layout with weights");
int totalWeight = 0;
javax.swing.table.TableColumnModel columnModel = getColumnModel();
int columnCount = columnModel.getColumnCount();
int weightCount = columnCount < weights.length ? columnCount : weights.length;
for (int i = 0; i < weightCount; i++){
totalWeight += weights[i];
}
int tableWidth = getWidth();
for (int i = 0; i < columnCount; i++){
int weight = 1;
if (i < weights.length){
weight = weights[i];
}
javax.swing.table.TableColumn column = columnModel.getColumn(i);
int width = tableWidth * weight / totalWeight;
column.setWidth(width);
column.setPreferredWidth(width);
}
}
super.doLayout();
}
}
}
}
