151
Hi,
How Eventlistner can be used with rendred combo box. I got one example of combobox in table as follows .
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package components;
/*
* TableRenderDemo .java requires no other files.
*/
import javax.swing.Def aultCellEditor;
import javax.swing.JCo mboBox;
import javax.swing.JFr ame;
import javax.swing.JPa nel;
import javax.swing.JSc rollPane;
import javax.swing.JTa ble;
import javax.swing.tab le.AbstractTabl eModel;
import javax.swing.tab le.DefaultTable CellRenderer;
import javax.swing.tab le.TableCellRen derer;
import javax.swing.tab le.TableColumn;
import java.awt.Compon ent;
import java.awt.Dimens ion;
import java.awt.GridLa yout;
/**
* TableRenderDemo is just like TableDemo, except that it
* explicitly initializes column sizes and it uses a combo box
* as an editor for the Sport column.
*/
public class TableRenderDemo extends JPanel {
private boolean DEBUG = false;
public TableRenderDemo () {
super(new GridLayout(1,0) );
JTable table = new JTable(new MyTableModel()) ;
table.setPrefer redScrollableVi ewportSize(new Dimension(500, 70));
table.setFillsV iewportHeight(t rue);
//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(tab le);
//Set up column sizes.
initColumnSizes (table);
//Fiddle with the Sport column's cell editors/renderers.
setUpSportColum n(table, table.getColumn Model().getColu mn(2));
//Add the scroll pane to this panel.
add(scrollPane) ;
}
/*
* This method picks good column sizes.
* If all column heads are wider than the column's cells'
* contents, then you can just use column.sizeWidt hToFit().
*/
private void initColumnSizes (JTable table) {
MyTableModel model = (MyTableModel)t able.getModel() ;
TableColumn column = null;
Component comp = null;
int headerWidth = 0;
int cellWidth = 0;
Object[] longValues = model.longValue s;
TableCellRender er headerRenderer =
table.getTableH eader().getDefa ultRenderer();
for (int i = 0; i < 5; i++) {
column = table.getColumn Model().getColu mn(i);
comp = headerRenderer. getTableCellRen dererComponent(
null, column.getHeade rValue(),
false, false, 0, 0);
headerWidth = comp.getPreferr edSize().width;
comp = table.getDefaul tRenderer(model .getColumnClass (i)).
getTableCellRen dererComponent(
table, longValues[i],
false, false, 0, i);
cellWidth = comp.getPreferr edSize().width;
if (DEBUG) {
System.out.prin tln("Initializi ng width of column "
+ i + ". "
+ "headerWidt h = " + headerWidth
+ "; cellWidth = " + cellWidth);
}
column.setPrefe rredWidth(Math. max(headerWidth , cellWidth));
}
}
public void setUpSportColum n(JTable table,
TableColumn sportColumn) {
//Set up the editor for the sport cells.
JComboBox comboBox = new JComboBox();
comboBox.addIte m("Snowboarding ");
comboBox.addIte m("Rowing");
comboBox.addIte m("Knitting") ;
comboBox.addIte m("Speed reading");
comboBox.addIte m("Pool");
comboBox.addIte m("None of the above");
sportColumn.set CellEditor(new DefaultCellEdit or(comboBox));
//Set up tool tips for the sport cells.
DefaultTableCel lRenderer renderer =
new DefaultTableCel lRenderer();
renderer.setToo lTipText("Click for combo box");
sportColumn.set CellRenderer(re nderer);
}
class MyTableModel extends AbstractTableMo del {
private String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian "};
private Object[][] data = {
{"Mary", "Campione",
"Snowboardi ng", new Integer(5), new Boolean(false)} ,
{"Alison", "Huml",
"Rowing", new Integer(3), new Boolean(true)},
{"Kathy", "Walrath",
"Knitting", new Integer(2), new Boolean(false)} ,
{"Sharon", "Zakhour",
"Speed reading", new Integer(20), new Boolean(true)},
{"Philip", "Milne",
"Pool", new Integer(10), new Boolean(false)}
};
public final Object[] longValues = {"Sharon", "Campione",
"None of the above",
new Integer(20), Boolean.TRUE};
public int getColumnCount( ) {
return columnNames.len gth;
}
public int getRowCount() {
return data.length;
}
public String getColumnName(i nt col) {
return columnNames[col];
}
public Object getValueAt(int row, int col) {
return data[row][col];
}
/*
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
*/
public Class getColumnClass( int c) {
return getValueAt(0, c).getClass();
}
/*
* Don't need to implement this method unless your table's
* editable.
*/
public boolean isCellEditable( int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (col < 2) {
return false;
} else {
return true;
}
}
/*
* Don't need to implement this method unless your table's
* data can change.
*/
public void setValueAt(Obje ct value, int row, int col) {
if (DEBUG) {
System.out.prin tln("Setting value at " + row + "," + col
+ " to " + value
+ " (an instance of "
+ value.getClass( ) + ")");
}
data[row][col] = value;
fireTableCellUp dated(row, col);
if (DEBUG) {
System.out.prin tln("New value of data:");
printDebugData( );
}
}
private void printDebugData( ) {
int numRows = getRowCount();
int numCols = getColumnCount( );
for (int i=0; i < numRows; i++) {
System.out.prin t(" row " + i + ":");
for (int j=0; j < numCols; j++) {
System.out.prin t(" " + data[i][j]);
}
System.out.prin tln();
}
System.out.prin tln("--------------------------");
}
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGU I() {
//Create and set up the window.
JFrame frame = new JFrame("TableRe nderDemo");
frame.setDefaul tCloseOperation (JFrame.EXIT_ON _CLOSE);
//Create and set up the content pane.
TableRenderDemo newContentPane = new TableRenderDemo ();
newContentPane. setOpaque(true) ; //content panes must be opaque
frame.setConten tPane(newConten tPane);
//Display the window.
frame.pack();
frame.setVisibl e(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.Swi ngUtilities.inv okeLater(new Runnable() {
public void run() {
createAndShowGU I();
}
});
}
}
I dont know how to use the combbox individually in each cell to get the value of selected item for slected combox in table. Any example will help me a lot.
Thanks in advance.
