Problem with TableModel, CellEditor and CellRenderer

[Lars Tode]

Hi,
now I tried a long time to implement an JButton in a JTable-Cell.
I know that I've to write a CellEditor and a CellRenderer, and may be a TableModel.
I read the Swing-Tutoriel from Sun, but I really have problems with it. I looked in the examples but I doesn't understand it.
How is a CellEditor, a CellRenderer and TableModel built up?
What I've to do, to realize what I want?
How I implement what I've created?
Based on some examples I tried to rebuild the editor on my own :

class MyTableEditor
extends DefaultCellEditor
{
public TableButtonEditor(JButton b) {
// only constructor with checkbox, combobox and textfield in the DeafaultCellEditor
super(new JCheckBox());
editorComponent = b;
setClickCountToStart(1);
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
String command = event.getActionCommand();
/*
Which line was the button???
*/

fireEditingStopped();
}
});
}
protected void fireEditingStopped() {
super.fireEditingStopped();
}
public Object getCellEditorValue() {
return editorComponent;
}
public Component getTableCellEditorComponent(JTable table, 
Object value,
boolean isSelected,
int row,
int column) {
((JButton)editorComponent).setText(value.toString());
return editorComponent;
}
}

Do anyone knows some other good sites or tutoriels about this?
Greetx
Lars

[Manfred Leonhardt]

Hi Lars,
I will do more than give you an example page. I can point you to some code that does exactly what you want!
http://www2.gol.com/users/tame/swing/examples/JTableExamples2.html
Regards,
Manfred.

[Lars Tode]

Hi,
first thanks for the link.
I take the example an tried to rebuild it, but I've now another problem. I tried to put Images and JButtons together in the JTable.
Either I can the image or I can see thew Button, but not together.
What I'm doing wrong.
Here the code of my AbstractTableModel :

AbstractTableModel model = new AbstractTableModel() {
final public int getColumnCount() { return columNames.size(); }
final public int getRowCount()    { return tableRows.size(); }
public String getColumnName(int col) {
return (String)tableRows.elementAt(col); 
}
public Object getValueAt(int row, int col) {
return ((Vector)tableRows.elementAt(row)).elementAt(col);
}
public Class getColumnClass(int col) {
if (col == 0) {
// returns an Image
return ImageIcon.class;
} else if (col >= 4) {
return JButton.class;
} else {
return getValueAt(0, col).getClass();
}
}

public boolean isCellEditable(int row, int col) {
//if (col < 4) {
return false;
//} else {
//return true;
//}
}
};

Greetx
Lars

[Lars Tode]

Hi,
is it possible to combinate two differen CellRenderers? For example a ButtonRenderer and an ImageRenderer???
Regards
Lars

[Manfred Leonhardt]

Hi Lars,
I would say, it is. I have not done it, but you seem to be looking in the wrong place. As I see it, the example I pointed you to does this:
table.getColumn( "Button" ).setCellRenderer( new ButtonRenderer() );
There should be nothing to stop you from doing the above and the following:
table.getColumn( "Image" ).setCellRenderer( new ImageRenderer() );
Each renderer should implement getTableCellRendererComponent and return itself after setting somethings.
Regards,
Manfred.

[Lars Tode]

Hi Manfred,
thanks for your help, it works! The table is now showing images and buttons
But i've another last question, sometimes the table shows the text, not the buttons. What can be the reason??
Regards
Lars