Java Swing - 通知GUI有关模型的更改

Question

I have a column in JTable that binds to the underlying boolean property on a list of business objects. I also have a combobox, which should select which items should be selected. I basically added the following code as a handler to the combobox:

            macroCombo.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    JComboBox comboBox = (JComboBox) e.getSource();
                    Predicate filter = (Predicate) comboBox.getSelectedItem();
                    for(SelectableKey key : tableEntries){
                        key.setSelected(filter.evaluate(key));
                    }
                }
            });

I also have a few other controls I want to change based on the value. At the moment, only a few cells in the table change their state to be selected/deselected. Only when I click on the row, or select multiple rows, the UI updates itself. Is there a call from the handler I need to make to tell GUI to redraw itself? ALos, if I modify other controls than JTable, how would I tell them to change their state?

Thanks

Answer 1

When you update a value in your TableModel , the model should fire a corresponding TableModelEvent (type: UPDATE ).

If your TableModel for example extends from AbstractTableModel , you can call the fireTableRowsUpdated method after you have made the changes.

Another approach is a TableModel which knows when it gets updated (for example by adding listeners to the objects it contains). This allows other code to simply update the objects contained in the TableModel , without having knowledge of the TableModel . The TableModel itself will then fire the event when it detects changes made to the objects it contains.

I prefer the second approach, as this avoids that I have to pass that TableModel around to all my other classes.

Consult the table tutorial for more information.