How to use JLists in JTable cells?
I would like a simple way to put a JList in a column of a JTable. I already have the JLists and the table, but when put in the table, the Jlists are displayed as Strings, which is normal, because I use DefaultTableModel. I have overriden the getColumnClass() as:
public Class<? extends Object> getColumnClass(int c)
{
return getValueAt(0, c).getClass();
}
but this just formats the integer and float values.
开发者_运维技巧I suppose that setValueAt() and getValueAt() should also be overriden, in order to return am array of Strings when I call JList.getSelectedValues(), but I can't figure out how.
I also want the cells to be editable, so the users can choose one or more option from the JList. After editing a row, I use a Save button to save the changes in a database, so I don't think I need a ListSelectionListener, JList.getSelectedValues() works just fine.I know this is a common question, but I couldn't find an answer here. If this is a duplicate, please let me know and I will delete it.
I've done it. For everyone who needs the same thing, here is what I've done:
1)I have created a JScrollTableRenderer, and set the column I needed to show the JList to use this renderer
table.getColumnModel().getColumn(5).setCellRenderer(new JScrollTableRenderer());
The JScrollTableRenderer class content:
public class JScrollTableRenderer extends DefaultTableCellRenderer {
JScrollPane pane = new JScrollPane();
public JScrollTableRenderer()
{
super();
}
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,
boolean hasFocus, int row, int column)
{
pane = (JScrollPane) value;
return pane;
}
}
2)I have created a JScrollTableEditor, and set the column I needed to show the JList to use this editor
table.getColumnModel().getColumn(5).setCellEditor(new JScrollTableEditor());
The JScrollTableEditor class content:
public class JScrollTableEditor extends AbstractCellEditor implements TableCellEditor {
JScrollPane component = new JScrollPane();
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected,
int rowIndex, int vColIndex)
{
component = ((JScrollPane) value);
return ((JScrollPane) value);
}
public Object getCellEditorValue()
{
return component;
}
}
3)I added this method in the JTable model:
public Class<? extends Object> getColumnClass(int c)
{
if(c == 5) return JScrollPane.class;
else return getValueAt(0, c).getClass();
}
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