![]() |
The Java Developers Almanac 1.4Order this book from Amazon. |
e964. Listening for Selection Events in a JTable ComponentTo listen for selection changes, you need to add a listener to both theJTable 's table model and to the table column model.
A selection change event has a first and last property that specifies the range of affected rows (or columns). For example, if the 5th row is selected and the user selects the 7th row, the first property is 4 and the last is property 6. There is not enough information in the event to determine exactly which cells have changed. See e942 Getting the Selected Cells in a JTable Component for an example of how to determine the selected cells. Changing the selection programmatically (see e941 Programmatically Making Selections in a JTable Component) causes selection change events to be fired. SelectionListener listener = new SelectionListener(table); table.getSelectionModel().addListSelectionListener(listener); table.getColumnModel().getSelectionModel() .addListSelectionListener(listener); public class SelectionListener implements ListSelectionListener { JTable table; // It is necessary to keep the table since it is not possible // to determine the table from the event's source SelectionListener(JTable table) { this.table = table; } public void valueChanged(ListSelectionEvent e) { // If cell selection is enabled, both row and column change events are fired if (e.getSource() == table.getSelectionModel() && table.getRowSelectionAllowed()) { // Column selection changed int first = e.getFirstIndex(); int last = e.getLastIndex(); } else if (e.getSource() == table.getColumnModel().getSelectionModel() && table.getColumnSelectionAllowed() ){ // Row selection changed int first = e.getFirstIndex(); int last = e.getLastIndex(); } if (e.getValueIsAdjusting()) { // The mouse button has not yet been released } } }
e966. Listening for Column-Related Changes in a JTable Component e967. Listening for Clicks on a Column Header in a JTable Component
© 2002 Addison-Wesley. |