I created JTable that contains information about employees. In this JTable I added the column called "Qualifications". This column is represented by JComboBox (different content at each row). For instance:
Row 1 | JComboBox(){"Programmer","Web"}
Row 2 | JComboBox(){"Writer","Editor"}
The JComboBox content is taken from the List<String> employees[row].getQualification().
The problem is that the selected item in Row 1 and Row 2 is "Programmer", however "Programmer" should not appear in Row 2. Only when I click on JComboBox, the correct list appears, i.e. Row 2 - {"Writer","Editor"}.
TableColumn column = table.getColumnModel().getColumn(5);
column.setCellRenderer(getRenderer());
private TableCellRenderer getRenderer() {
return new TableCellRenderer() {
private JComboBox<String> box = new JComboBox<String>();
#Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
for (String q : employees[row].getQualification())
box.addItem(q);
box.setBackground(isSelected ? table.getSelectionBackground() : table.getBackground());
box.setForeground(isSelected ? table.getSelectionForeground() : table.getForeground());
return box;
}
};
}
Override the getCellEditor() method of the JTable. Something like:
import java.awt.*;
import java.awt.event.*;
import java.util.List;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
public class TableComboBoxByRow extends JPanel
{
List<TableCellEditor> editors = new ArrayList<TableCellEditor>(3);
public TableComboBoxByRow()
{
setLayout( new BorderLayout() );
// Create the editors to be used for each row
String[] items1 = { "Red", "Blue", "Green" };
JComboBox<String> comboBox1 = new JComboBox<String>( items1 );
DefaultCellEditor dce1 = new DefaultCellEditor( comboBox1 );
editors.add( dce1 );
String[] items2 = { "Circle", "Square", "Triangle" };
JComboBox<String> comboBox2 = new JComboBox<String>( items2 );
DefaultCellEditor dce2 = new DefaultCellEditor( comboBox2 );
editors.add( dce2 );
String[] items3 = { "Apple", "Orange", "Banana" };
JComboBox<String> comboBox3 = new JComboBox<String>( items3 );
DefaultCellEditor dce3 = new DefaultCellEditor( comboBox3 );
editors.add( dce3 );
// Create the table with default data
Object[][] data =
{
{"Color", "Red"},
{"Shape", "Square"},
{"Fruit", "Banana"},
{"Plain", "Text"}
};
String[] columnNames = {"Type","Value"};
DefaultTableModel model = new DefaultTableModel(data, columnNames);
JTable table = new JTable(model)
{
// Determine editor to be used by row
public TableCellEditor getCellEditor(int row, int column)
{
int modelColumn = convertColumnIndexToModel( column );
if (modelColumn == 1 && row < 3)
return editors.get(row);
else
return super.getCellEditor(row, column);
}
};
JScrollPane scrollPane = new JScrollPane( table );
add( scrollPane );
}
private static void createAndShowUI()
{
JFrame frame = new JFrame("Table Combo Box by Row");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add( new TableComboBoxByRow() );
frame.setSize(200, 200);
frame.setLocationByPlatform( true );
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowUI();
}
});
}
}
JComboBox-es appear only on a click
because you use them as CellEditor, which apper only when you edit cells. If you want to display your column cells as JComboBox everytime, you need to use TableCellRenderer, read about that. Here is simple example of JComboBox as renderer :
import java.awt.Component;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
public class TestFrame extends JFrame{
public TestFrame(){
init();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
}
private void init() {
JTable t = new JTable(3,3);
TableColumn column = t.getColumnModel().getColumn(2);
column.setCellRenderer(getRenderer());
add(new JScrollPane(t));
}
private TableCellRenderer getRenderer() {
return new TableCellRenderer() {
private JComboBox<String> box = new JComboBox<String>(new String[]{"1","2"});
#Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
box.setBackground(isSelected ? table.getSelectionBackground() : table.getBackground());
box.setForeground(isSelected ? table.getSelectionForeground() : table.getForeground());
return box;
}
};
}
public static void main(String... s){
new TestFrame();
}
}
Thanks to #alex2410, I cleaned up the code and wrapped it into a ComboTable class which should do the job for you. instantiate ComboTable class with a hashmap of each row values (the demo assumes 2 columns, but you can add more). Note MyMap.of is just a wrapper for java 9 Map.of since I was using Java 8 at that time. same for MyList.of
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.EventObject;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.event.CellEditorListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import rs.code.utils.MyList;
import rs.code.utils.MyMap;
public class Test extends JFrame
{
private static final long serialVersionUID = 1L;
public ComboTable table = new ComboTable(MyMap.of("Gender", MyList.of("male", "female"), "City", MyList.of("london", "bedord"), "orientation", MyList.of("left", "right")));
public Test()
{
super("EachRow Editor Example");
JScrollPane scroll = new JScrollPane(table);
getContentPane().add(scroll, BorderLayout.CENTER);
setPreferredSize(new Dimension(400, 120));
setLocation(150, 100);
pack();
setVisible(true);
}
public static void main(String[] args)
{
Test frame = new Test();
frame.addWindowListener(new WindowAdapter()
{
#Override
public void windowClosing(WindowEvent e)
{
System.out.println(frame.table.getSelectedValues().toString());
System.exit(0);
}
});
}
}
class ComboTable extends JTable
{
private static final long serialVersionUID = 1L;
protected Map<Integer, ComboCellEditor> editors = new LinkedHashMap<>();
public ComboTable(Map<String, List<String>> rows)
{
setModel(new DefaultTableModel(new String[] {"Attribute", "Value"}, rows.size()));
setRowHeight(20);
EachRowEditor rowEditor = new EachRowEditor(this);
int i = 0;
for(String key : rows.keySet())
{
getModel().setValueAt(key, i, 0);
editors.put(i++, new ComboCellEditor(createComboBox(rows.get(key))));
}
getColumn("Value").setCellEditor(rowEditor);
getColumn("Value").setCellRenderer(getRenderer());
}
public Map<Integer, ComboCellEditor> getEditors()
{
return editors;
}
public Map<String, String> getSelectedValues()
{
Map<String, String> values = new LinkedHashMap<>();
for(int i=0;i<getModel().getRowCount();i++)
{
values.put(getModel().getValueAt(i, 0).toString(), editors.get(i).getComboBox().getSelectedItem().toString());
}
return values;
}
private JComboBox<String> createComboBox(List<String> elements)
{
JComboBox<String> comboBox = new JComboBox<>();
for (String element : elements)
{
comboBox.addItem(element);
}
comboBox.setSelectedIndex(0);
comboBox.addComponentListener(new ComponentAdapter()
{
#Override
public void componentShown(ComponentEvent e)
{
final JComponent c = (JComponent) e.getSource();
SwingUtilities.invokeLater(new Runnable()
{
#SuppressWarnings("rawtypes")
#Override
public void run()
{
c.requestFocus();
System.out.println(c);
if (c instanceof JComboBox)
{
System.out.println(((JComboBox) c).getSelectedItem());
}
}
});
}
});
return comboBox;
}
private TableCellRenderer getRenderer()
{
return new TableCellRenderer()
{
#Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
{
editors.get(row).getComboBox().setBackground(isSelected ? table.getSelectionBackground() : table.getBackground());
editors.get(row).getComboBox().setForeground(isSelected ? table.getSelectionForeground() : table.getForeground());
return editors.get(row).getComboBox();
}
};
}
}
class ComboCellEditor extends DefaultCellEditor
{
private static final long serialVersionUID = 1L;
private final JComboBox<String> comboBox;
public ComboCellEditor(JComboBox<String> comboBox)
{
super(comboBox);
this.comboBox = comboBox;
}
public JComboBox<String> getComboBox()
{
return comboBox;
}
}
class EachRowEditor implements TableCellEditor
{
private TableCellEditor editor;
private final TableCellEditor defaultEditor;
private final ComboTable table;
public EachRowEditor(ComboTable table)
{
this.table = table;
defaultEditor = new DefaultCellEditor(new JTextField());
}
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column)
{
return editor.getTableCellEditorComponent(table, value, isSelected, row, column);
}
public Object getCellEditorValue()
{
return editor.getCellEditorValue();
}
public boolean stopCellEditing()
{
return editor.stopCellEditing();
}
public void cancelCellEditing()
{
editor.cancelCellEditing();
}
public boolean isCellEditable(EventObject anEvent)
{
selectEditor((MouseEvent) anEvent);
return editor.isCellEditable(anEvent);
}
public void addCellEditorListener(CellEditorListener l)
{
editor.addCellEditorListener(l);
}
public void removeCellEditorListener(CellEditorListener l)
{
editor.removeCellEditorListener(l);
}
public boolean shouldSelectCell(EventObject anEvent)
{
selectEditor((MouseEvent) anEvent);
return editor.shouldSelectCell(anEvent);
}
protected void selectEditor(MouseEvent e)
{
int row;
if (e == null)
{
row = table.getSelectionModel().getAnchorSelectionIndex();
}
else
{
row = table.rowAtPoint(e.getPoint());
}
editor = table.getEditors().get(row);
if (editor == null)
{
editor = defaultEditor;
}
}
}
Related
I would like to have a JTable with JComboBoxes that is always visible. My problem is when I click on a JComboBox and select a value, my JComboBox is not updated.
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.util.ArrayList;
import java.util.List;
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
public class trial extends JFrame {
private ArrayList<JComboBox> comboslist= new ArrayList <JComboBox>();/*list of my
comboboxes*/
public static void main(String[] args) {
trial tr= new trial();
}
public trial(){
this.setSize(new Dimension(600,100));
String[] ColData={"Index","Field Name","Value","Range"};
Object[][] TrowData={ };
DefaultTableModel model = new DefaultTableModel(TrowData, ColData);
final List<TableCellEditor> editors = new ArrayList<TableCellEditor>();
JComboBox combo1= new JComboBox();
combo1.addItem("don");
combo1.addItem("mump");
combo1.setEditable(true);
combo1.setBackground(Color.WHITE);
Object[] rowdata = {"cars","books","chicken","soup"};
model.addRow(rowdata);
DefaultCellEditor dce1 = new DefaultCellEditor(combo1);
editors.add(dce1);
JComboBox combo2= new JComboBox();
combo2.addItem("sop");
combo2.addItem("act");
combo2.setEditable(true);
combo2.setBackground(Color.WHITE);
Object[] rowdata2 = {"goats","cats","salads","dogs"};
model.addRow(rowdata2);
DefaultCellEditor dce2= new DefaultCellEditor(combo2);
editors.add(dce2);
comboslist.add(combo1);
comboslist.add(combo2);
JTable table = new JTable(model)
{
// Determine editor to be used by row
public TableCellEditor getCellEditor(int row, int column)
{
int modelColumn = convertColumnIndexToModel( column );
if (modelColumn == 2)
return editors.get(row);
else
return super.getCellEditor(row, column);
}
};
table.setRowHeight(0, 30);
table.setRowHeight(1, 30);
table.setPreferredScrollableViewportSize(new Dimension(800, 150));
table.setFillsViewportHeight(true);
TableColumn valCol= table.getColumnModel().getColumn(2);
int x=0;
for(JComboBox cb: comboslist ){
valCol.setCellRenderer(new ComboBoxCellRenderer(cb,x++));
}
this.add(table);
this.setVisible(true);
}
private class ComboBoxCellRenderer extends JComboBox implements TableCellRenderer {
private JComboBox combo;
private int idx=0;
private ComboBoxCellRenderer comboRenderer;
public ComboBoxCellRenderer(JComboBox com,int ind)
{
for (int i = 0; i < com.getItemCount(); i++)
{
addItem(com.getItemAt(i));
}
comboRenderer=this;
}
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
if(comboslist.get(row).getSelectedItem()!=null)
{
if(isSelected && row==idx)
{
setSelectedItem(comboslist.get(row).getSelectedItem().toString());
comboRenderer.setSelectedItem(comboslist.get(row).getSelectedItem().toString());
}
}else
{
setSelectedItem(value);
}
return this;
}
}
}
You've kinda got in backwards and twisted around. Instead of trying to have a number of combobox editors, you should have one, which is then configured based on the row.
Based on this idea, you could have a single class act as both the renderer and the editor, for example
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.swing.AbstractCellEditor;
import javax.swing.ComboBoxModel;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
public class Trial extends JFrame {
public static void main(String[] args) {
Trial tr = new Trial();
}
public Trial() {
this.setSize(new Dimension(600, 100));
String[] ColData = {"Index", "Field Name", "Value", "Range"};
Object[][] TrowData = {};
DefaultTableModel model = new DefaultTableModel(TrowData, ColData);
final List<TableCellEditor> editors = new ArrayList<TableCellEditor>();
model.addRow(new String[] {"cars", "books", "chicken", "soup"});
model.addRow(new String[] {"goats", "cats", "salads", "dogs"});
DefaultComboBoxModel model1 = new DefaultComboBoxModel();
model1.addElement("don");
model1.addElement("mump");
DefaultComboBoxModel model2 = new DefaultComboBoxModel();
model2.addElement("sop");
model2.addElement("act");
Map<Integer, ComboBoxModel<String>> models = new HashMap<>(2);
models.put(0, model1);
models.put(1, model2);
JTable table = new JTable(model);
table.setRowHeight(0, 30);
table.setRowHeight(1, 30);
table.setPreferredScrollableViewportSize(new Dimension(800, 150));
table.setFillsViewportHeight(true);
ComboBoxCellRendererEditor rendererEditor = new ComboBoxCellRendererEditor(models);
table.getColumnModel().getColumn(1).setCellRenderer(rendererEditor);
table.getColumnModel().getColumn(1).setCellEditor(rendererEditor);
this.add(table);
this.setVisible(true);
}
private static class ComboBoxCellRendererEditor extends AbstractCellEditor implements TableCellRenderer, TableCellEditor {
private JComboBox<String> comboBox;
private Map<Integer, ComboBoxModel<String>> models;
public ComboBoxCellRendererEditor(Map<Integer, ComboBoxModel<String>> models) {
comboBox = new JComboBox<>();
comboBox.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
stopCellEditing();
}
});
this.models = models;
}
protected void configure(Object value, int row) {
ComboBoxModel<String> model = models.get(row);
if (model == null) {
model = new DefaultComboBoxModel<>();
}
comboBox.setModel(model);
comboBox.setSelectedItem(value);
}
#Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
configure(value, row);
return comboBox;
}
#Override
public Object getCellEditorValue() {
return comboBox.getSelectedItem();
}
#Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
configure(value, row);
return comboBox;
}
}
}
adding this piece of code solved everything.
column.setCellRenderer(new TableCellRenderer() {
JComboBox box = new JComboBox();
#Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
box.removeAllItems();
box.addItem(value.toString());
return box;
}
});
I have a JTable with 3 columns, the first column is a simple text, the other 2 columns are JComboBox. Column Name and Column Email both have a custom TableCellEditor and TableCellRenderer.
Sometimes when I click on a comboBox in a row that is not selected, the cell would not be drawn with the proper selected color (blue).
For illustration purposes, the TableCellRenderer draws pink cells, and TableCellEditor draws orange cells.
JTable returns false for isCellSelected(), more specifically returns false for isRowSelected(), at JTable editCellAt(). However when the renderer calls isCellSelected(), it returns true, so renderer is properly colored.
I can't figure out what's going wrong here.
My SSCCE:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.AbstractCellEditor;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.WindowConstants;
import javax.swing.plaf.basic.BasicComboBoxEditor;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableColumnModel;
import org.iii.snsi.streamcenter.main.Main;
public class EditorNotSelectedColorFrame {
public JComponent makeUI() {
JTable table = new JTable();
DefaultTableModel model = new DefaultTableModel(new String[]{"COL 1", "COL 2", "COL 3"}, 0);
table.setModel(model);
for (int i = 0; i < 5; i++) {
Object[] row = new Object[3];
row[0] = new MyListItem(new String[]{"item a", "item b", "item c"});
row[1] = new MyListItem(new String[]{"item d", "item e", "item f"});
row[2] = new MyListItem(new String[]{"item g", "item h", "item i"});
model.addRow(row);
}
MyTableCellEditor editor = new MyTableCellEditor(Color.orange, Color.BLACK);
MyTableCellRenderer renderer = new MyTableCellRenderer(Color.pink, Color.BLACK);
TableColumnModel columnModel = table.getColumnModel();
columnModel.getColumn(0).setCellEditor(editor);
columnModel.getColumn(1).setCellEditor(editor);
columnModel.getColumn(2).setCellEditor(editor);
columnModel.getColumn(0).setCellRenderer(renderer);
columnModel.getColumn(1).setCellRenderer(renderer);
columnModel.getColumn(2).setCellRenderer(renderer);
JPanel panel = new JPanel(new BorderLayout());
panel.add(new JScrollPane(table));
return panel;
}
public static void main(String... args) {
try {
for (UIManager.LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
if ("Windows".equals(info.getName())) {
UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.getContentPane().add(new EditorNotSelectedColorFrame().makeUI());
f.setSize(320, 240);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
});
}
}
class MyListItem<T> {
private ArrayList<T> items = new ArrayList<>();
private Integer selectedIndex = -1;
public MyListItem(T[] items) {
selectedIndex = -1;
this.items.addAll(Arrays.asList(items));
}
public ArrayList<T> getItems() {
return items;
}
public void setSelectedIndex(Integer selectedIndex) {
this.selectedIndex = selectedIndex;
}
public Integer getSelectedIndex() {
return selectedIndex;
}
}
class MyTableCellEditor extends AbstractCellEditor implements TableCellEditor {
private Color unselectedBackground;
private Color unselectedForeground;
private JMyComboBox comboBox;
private MyListItem myListItem;
public MyTableCellEditor(Color bg, Color fg) {
unselectedBackground = bg;
unselectedForeground = fg;
comboBox = new JMyComboBox(bg, fg);
comboBox.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
stopCellEditing();
}
});
}
#Override
public Object getCellEditorValue() {
int idx = comboBox.getSelectedIndex();
if (idx > -1) {
myListItem.setSelectedIndex(comboBox.getSelectedIndex());
}
return myListItem;
}
#Override
public Component getTableCellEditorComponent(JTable table, Object value,
boolean isSelected, int row, int column) {
comboBox.removeAllItems();
if (value instanceof MyListItem) {
myListItem = (MyListItem) value;
for (Object item : myListItem.getItems()) {
comboBox.addItem(item.toString());
}
comboBox.setSelectedIndex(myListItem.getSelectedIndex());
} else {
myListItem = null;
}
if (isSelected) {
comboBox.setForeground(table.getSelectionForeground());
comboBox.setBackground(table.getSelectionBackground());
} else {
comboBox.setForeground(unselectedForeground);
comboBox.setBackground(unselectedBackground);
}
return comboBox;
}
}
class MyTableCellRenderer extends DefaultTableCellRenderer {
private Color unselectedBackground;
private Color unselectedForeground;
private JMyComboBox comboBox;
public MyTableCellRenderer(Color bg, Color fg) {
super();
unselectedBackground = bg;
unselectedForeground = fg;
comboBox = new JMyComboBox(bg, fg);
}
#Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
comboBox.removeAllItems();
if (value instanceof MyListItem) {
MyListItem cellItem = (MyListItem) value;
for (Object item : cellItem.getItems()) {
comboBox.addItem(item.toString());
}
comboBox.setSelectedIndex(cellItem.getSelectedIndex());
}
if (isSelected) {
comboBox.setForeground(table.getSelectionForeground());
comboBox.setBackground(table.getSelectionBackground());
} else {
comboBox.setForeground(unselectedForeground);
comboBox.setBackground(unselectedBackground);
}
return comboBox;
}
}
class JMyComboBox extends JComboBox<String> {
private MyComboBoxEditor editor = new MyComboBoxEditor();
private MyComboBoxRenderer renderer = new MyComboBoxRenderer();
public JMyComboBox(Color bg, Color fg) {
super();
setEditable(true);
setEditor(editor);
setRenderer(renderer);
editor.setColors(bg, fg);
renderer.setColors(bg, fg);
}
#Override
public void setBackground(Color bg) {
super.setBackground(bg);
if (editor != null) {
editor.setColors(bg, getForeground());
}
}
#Override
public void setForeground(Color fg) {
super.setForeground(fg);
if (editor != null) {
editor.setColors(getBackground(), fg);
}
}
}
class MyComboBoxEditor extends BasicComboBoxEditor {
private JLabel label = new JLabel();
public MyComboBoxEditor() {
super();
label.setOpaque(true);
}
public void setColors(Color background, Color foreground) {
label.setBackground(background);
label.setForeground(foreground);
}
#Override
public void setItem(Object anObject) {
super.setItem(anObject);
label.setText(((JTextField) super.getEditorComponent()).getText());
}
#Override
public Component getEditorComponent() {
return label;
}
}
class MyComboBoxRenderer extends DefaultListCellRenderer {
private Color unselectedBackground;
private Color unselectedForeground;
public void setColors(Color background, Color foreground) {
this.unselectedBackground = background;
this.unselectedForeground = foreground;
}
#Override
public Component getListCellRendererComponent(JList<?> list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
if (!isSelected) {
if (unselectedBackground != null) {
setBackground(unselectedBackground);
}
if (unselectedForeground != null) {
setForeground(unselectedForeground);
}
}
return this;
}
}
I have a drop down and simple text field in my JTable and based on the specific value selected in the drop down, I want to change the text field to drop down as well.
Below is the code which I am using for the same and I am able to convert the text field to drop down based on the selection but the problem is that it convert all the text fields in the column to drop down. I just want to change the selected row to drop down, rest should remain as text field.
comboBox2.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent arg0) {
String properties = (String) comboBox2.getSelectedItem();
try {
switch (properties) {
case "Choose Object":
dd_OR = table.getColumnModel().getColumn(3);
model1 = new DefaultComboBoxModel<String>();
model1.addElement("");
model1.addElement("Snowboarding");
model1.addElement("Rowing");
model1.addElement("Knitting");
JComboBox comboBox3 = new JComboBox<String>(model1);
AutoCompleteDecorator.decorate(comboBox3);
dd_OR.setCellEditor(new DefaultCellEditor(comboBox3));
break;
}
One way is to override the getCellEditor(...) method of the JTable so you can dynamically determine which editor to use.
Here is a simple example to get your started:
import java.awt.*;
import java.util.List;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import javax.swing.table.*;
public class TableComboBoxByRow extends JPanel
{
List<String[]> editorData = new ArrayList<String[]>(3);
public TableComboBoxByRow()
{
setLayout( new BorderLayout() );
// Create the editorData to be used for each row
editorData.add( new String[]{ "Red", "Blue", "Green" } );
editorData.add( new String[]{ "Circle", "Square", "Triangle" } );
editorData.add( new String[]{ "Apple", "Orange", "Banana" } );
// Create the table with default data
Object[][] data =
{
{"Color", "Red"},
{"Shape", "Square"},
{"Fruit", "Banana"},
{"Plain", "Text"}
};
String[] columnNames = {"Type","Value"};
DefaultTableModel model = new DefaultTableModel(data, columnNames);
JTable table = new JTable(model)
{
// Determine editor to be used by row
public TableCellEditor getCellEditor(int row, int column)
{
int modelColumn = convertColumnIndexToModel( column );
if (modelColumn == 1 && row < 3)
{
JComboBox<String> comboBox1 = new JComboBox<String>( editorData.get(row));
return new DefaultCellEditor( comboBox1 );
}
else
return super.getCellEditor(row, column);
}
};
JScrollPane scrollPane = new JScrollPane( table );
add( scrollPane );
// table.getColumnModel().getColumn(1).setCellRenderer(new ComboBoxRenderer2() );
}
/*
class ComboBoxRenderer2 extends DefaultTableCellRenderer
{
#Override
public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
{
JLabel label = (JLabel) super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
label.setIcon(UIManager.getIcon("Table.descendingSortIcon"));
return label;
}
}
*/
private static void createAndShowUI()
{
JFrame frame = new JFrame("Table Combo Box by Row");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add( new TableComboBoxByRow() );
frame.setSize(200, 200);
frame.setLocationByPlatform( true );
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowUI();
}
});
}
}
Setting the cell Editor to DefaultCellEditor will apply to all the rows in the column 3. Please your above code like in given below
TableColumn column = table.getColumnModel().getColumn(3);
column.setCellEditor(new CustomTableCellEditor());
And the CustomTableEditor will be
import java.awt.Component;
import javax.swing.AbstractCellEditor;
import javax.swing.JComboBox;
import javax.swing.JTable;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableModel;
public class CustomTableCellEditor extends AbstractCellEditor implements TableCellEditor {
/**
*
*/
private static final long serialVersionUID = -6924557080981304281L;
private JComboBox<String> editor;
private String [] values = {"","Snowboarding", "Rowing", "Knitting"};
public CustomTableCellEditor() {
// Create a new Combobox with the array of values.
editor = new JComboBox<String>(values);
}
#Override
public Object getCellEditorValue() {
// TODO Auto-generated method stub
return editor.getSelectedItem();
}
#Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int rowIndex, int colIndex) {
// Set the model data of the table
if(isSelected)
{
// Do Whatever you want
}
return editor;
}
}
Hope it will help you
Thanks
Rajkumar
I want to change the action of the button to delete. I have this code:
package buttonexample;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.*;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableModel;
public class ButtonExample {
public JTable table;
public static void main(String[] args) {
final ButtonExample example = new ButtonExample();
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
example.createAndShowGUI();
}
});
}
private void createAndShowGUI() {
JFrame frame = new JFrame("Button Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
table = new JTable(new JTableModel());
JScrollPane scrollPane = new JScrollPane(table);
table.setFillsViewportHeight(true);
TableCellRenderer buttonRenderer = new JTableButtonRenderer();
//table.getColumn("Button1").setCellRenderer(buttonRenderer);
table.getColumn("Button2").setCellRenderer(buttonRenderer);
table.addMouseListener(new JTableButtonMouseListener(table));
frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
frame.getContentPane().setPreferredSize(new Dimension(500, 200));
frame.pack();
frame.setVisible(true);
}
public static class JTableModel extends AbstractTableModel {
private static final long serialVersionUID = 1L;
private static final String[] COLUMN_NAMES = new String[] {"Id", "Stuff", "Asdfsdf", "Button2"};
private static final Class<?>[] COLUMN_TYPES = new Class<?>[] {Integer.class, String.class, String.class, JButton.class};
#Override public int getColumnCount() {
return COLUMN_NAMES.length;
}
#Override public int getRowCount() {
return 4;
}
#Override public String getColumnName(int columnIndex) {
return COLUMN_NAMES[columnIndex];
}
#Override public Class<?> getColumnClass(int columnIndex) {
return COLUMN_TYPES[columnIndex];
}
#Override public Object getValueAt(final int rowIndex, final int columnIndex) {
switch (columnIndex) {
case 0: return rowIndex;
case 1: return "Text for "+rowIndex;
case 2: return "Column for "+rowIndex;
case 3: final JButton button = new JButton(COLUMN_NAMES[columnIndex]);
button.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent arg0) {
// When this is clicked the whole row will be deleted.
JOptionPane.showMessageDialog(JOptionPane.getFrameForComponent(button),
"Button clicked for row "+rowIndex);
}
});
return button;
default: return "Error";
}
}
}
private static class JTableButtonRenderer implements TableCellRenderer {
#Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
JButton button = (JButton)value;
if (isSelected) {
button.setForeground(table.getSelectionForeground());
button.setBackground(table.getSelectionBackground());
} else {
button.setForeground(table.getForeground());
button.setBackground(UIManager.getColor("Button.background"));
}
return button;
}
}
private static class JTableButtonMouseListener extends MouseAdapter {
private final JTable table;
public JTableButtonMouseListener(JTable table) {
this.table = table;
}
public void mouseClicked(MouseEvent e) {
int column = table.getColumnModel().getColumnIndexAtX(e.getX());
int row = e.getY()/table.getRowHeight();
if (row < table.getRowCount() && row >= 0 && column < table.getColumnCount() &&
column >= 0) {
Object value = table.getValueAt(row, column);
if (value instanceof JButton) {
((JButton)value).doClick();
}
}
}
}
}
But the (DefaultTableModel)someTable.getModel(); model.removeRow(row); I can't make it work because the table model does not have any name and I don't know what to name it. I have tried initializing a table model and I get error saying non-static variable model cannot be reference to a static context. Is there a way to delete the row in a static context?
The example by camickr is probably a more reusable solution, but for the sake of education...
Rendering of cells is the domain of the view
Model's should never contain components, especially if you're thinking about rendering them to the screen, this is simply the wrong approach to take...
You need to set up a TableCellEditor which will act as the means by which you can retrieve notification of the edit actions (mouse click or keypress)
This is a basic example, for simplicity, I've used a DefaultTableModel as it has a nice removeRow method, but conceivably, you could use any TableModel, so long as you provided the means to remove a row and modified by the editor to support it...
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.EventObject;
import javax.swing.AbstractCellEditor;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.event.CellEditorListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableModel;
public class ButtonExample {
public JTable table;
public static void main(String[] args) {
final ButtonExample example = new ButtonExample();
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
example.createAndShowGUI();
}
});
}
private void createAndShowGUI() {
JFrame frame = new JFrame("Button Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
table = new JTable(new ExampleTableModel());
JScrollPane scrollPane = new JScrollPane(table);
table.setFillsViewportHeight(true);
table.getColumn("action").setCellRenderer(new ButtonCellRenderer());
table.getColumn("action").setCellEditor(new ButtonCellEditor());
frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
}
public static class ExampleTableModel extends DefaultTableModel {
public ExampleTableModel() {
super(new Object[]{"id", "stuff", "blah", "action"}, 0);
for (int index = 0; index < 10; index++) {
addRow(new Object[]{index, "Text for " + index, "Na na", index});
}
}
#Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return columnIndex == 3;
}
}
public static class ButtonCellRenderer extends JButton implements TableCellRenderer {
#Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
if (value != null) {
setText("Delete row " + value.toString());
} else {
setText("Delete Me");
}
if (isSelected) {
setForeground(table.getSelectionForeground());
setBackground(table.getSelectionBackground());
} else {
setForeground(table.getForeground());
setBackground(UIManager.getColor("Button.background"));
}
return this;
}
}
public static class ButtonCellEditor extends AbstractCellEditor implements TableCellEditor {
private JButton editor;
private Object value;
private int row;
private JTable table;
public ButtonCellEditor() {
editor = new JButton();
editor.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
if (table != null) {
fireEditingStopped();
TableModel model = table.getModel();
if (model instanceof DefaultTableModel) {
((DefaultTableModel) model).removeRow(row);
}
}
}
});
}
#Override
public boolean isCellEditable(EventObject e) {
return true;
}
#Override
public Object getCellEditorValue() {
return value;
}
#Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
this.table = table;
this.row = row;
this.value = value;
if (value != null) {
editor.setText("Delete row " + value.toString());
} else {
editor.setText("Delete Me");
}
if (isSelected) {
editor.setForeground(table.getSelectionForeground());
editor.setBackground(table.getSelectionBackground());
} else {
editor.setForeground(table.getForeground());
editor.setBackground(UIManager.getColor("Button.background"));
}
return editor;
}
}
}
Take a closer look at How to Use Tables for more details
This is just a personal preference, but I prefer to use a toolbar or menu item and key bindings to provide this support. Buttons in a table just seem so...dated - IMHO
I have a question for JTable.
When I select a cell and then there are same value cell in JTable which I chose, that cells highlight background red color.
I don't know what to do....
P.S: I am sorry, I do not know how to enter the code in here...;;
You can implement ListSelectionListener to track selection changes in a table. Then implement TableCellRenderer that would change background of a cell with the same value of a selected object. Check out How to Use Tables for more details on JTable, renderers and selection.
Here is a very simple example that demonstrates this idea:
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import java.awt.Color;
import java.awt.Component;
public class TableDemo {
private static void createAndShowGUI() {
JFrame frame = new JFrame("TableDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel contentPanel = new JPanel();
String[] columnNames = { "Column1", "Column2" };
Object[][] data = { { "1", "3" }, { "2", "5" }, { "7", "1" },
{ "5", "3" } };
JTable table = new JTable();
MyModel model = new MyModel(Color.RED, table.getBackground());
model.setDataVector(data, columnNames);
table.setModel(model);
table.setColumnSelectionAllowed(true);
table.setDefaultRenderer(Object.class, new TestCellRenderer());
SelectionListener listener = new SelectionListener(table);
table.getSelectionModel().addListSelectionListener(listener);
table.getColumnModel().getSelectionModel()
.addListSelectionListener(listener);
JScrollPane scrollPane = new JScrollPane(table);
contentPanel.add(scrollPane);
contentPanel.setOpaque(true);
frame.add(contentPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
static class TestCellRenderer extends DefaultTableCellRenderer {
public Component getTableCellRendererComponent(JTable table,
Object value, boolean isSelected, boolean hasFocus, int row,
int column) {
Component c = super.getTableCellRendererComponent(table, value,
isSelected, hasFocus, row, column);
MyModel model = (MyModel) table.getModel();
c.setBackground(model.getCellColor(row, column));
return c;
}
}
static class MyModel extends DefaultTableModel {
private Object selectedObject;
private Color selectedColor;
private Color normalColor;
public MyModel(Color selectedColor, Color normalColor) {
this.selectedColor = selectedColor;
this.normalColor = normalColor;
}
public Color getCellColor(int row, int column) {
if (getValueAt(row, column).equals(selectedObject))
return selectedColor;
return normalColor;
}
public void setSelectedObject(Object selectedObject) {
this.selectedObject = selectedObject;
fireTableRowsUpdated(0, getRowCount());
}
}
static class SelectionListener implements ListSelectionListener {
private JTable table;
SelectionListener(JTable table) {
this.table = table;
}
public void valueChanged(ListSelectionEvent e) {
int rowIndex = table.getSelectedRow();
int colIndex = table.getSelectedColumn();
if (!e.getValueIsAdjusting() && colIndex != -1 && rowIndex != -1) {
((MyModel) table.getModel()).setSelectedObject(table
.getValueAt(rowIndex, colIndex));
}
}
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
Here is a result:
EDIT: solution using renderer only, without table model
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import java.awt.Color;
import java.awt.Component;
public class TableDemo {
private static void createAndShowGUI() {
JFrame frame = new JFrame("TableDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel contentPanel = new JPanel();
String[] columnNames = { "Column1", "Column2" };
Object[][] data = { { "1", "3" }, { "2", "5" }, { "7", "1" },
{ "5", "3" } };
JTable table = new JTable(new DefaultTableModel(data, columnNames));
table.setColumnSelectionAllowed(true);
TestCellRenderer renderer = new TestCellRenderer();
table.setDefaultRenderer(Object.class, renderer);
SelectionListener listener = new SelectionListener(table);
table.getSelectionModel().addListSelectionListener(listener);
table.getColumnModel().getSelectionModel()
.addListSelectionListener(listener);
JScrollPane scrollPane = new JScrollPane(table);
contentPanel.add(scrollPane);
contentPanel.setOpaque(true);
frame.add(contentPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
static class TestCellRenderer extends DefaultTableCellRenderer {
public Component getTableCellRendererComponent(JTable table,
Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
Component c = super.getTableCellRendererComponent(table, value,
isSelected, hasFocus, row, column);
int columnIndex = table.getSelectedColumn();
int rowIndex = table.getSelectedRow();
if (columnIndex != -1 && rowIndex != -1){
Object selectedValue = table.getValueAt(rowIndex, columnIndex);
if (value.equals(selectedValue)) {
c.setBackground(Color.RED);
} else {
c.setBackground(table.getBackground());
}
}
return c;
}
}
static class SelectionListener implements ListSelectionListener {
private JTable table;
SelectionListener(JTable table) {
this.table = table;
}
public void valueChanged(ListSelectionEvent e) {
int rowIndex = table.getSelectedRow();
int colIndex = table.getSelectedColumn();
if (!e.getValueIsAdjusting() && colIndex != -1 && rowIndex != -1){
table.repaint();
}
}
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}