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JComboBox with JTable as ListCellRenderer component

I am currently working on a JComboBox component where I want to have a JTable inside of a ComboBox for a drop down selection. I have extended the ListCellRenderer and I have the table inside of the popup.
I want to present it two different ways. The first as a label of a bound column of the selected row when the popup is not visible. The second is to show the table with a JScrollPane when the popup is visible.
Unfortunately, When I do this the popup is being shrunk to the row height of the list which only leaves room for the columns of the table.
If I just use the scrollpane I can see the full table but then when the popup is not visible I see the table inside the combobox which is not what I want.
How can I set the height such that the table can fit while still being able to show the label only when the popup is not visible?
Below is a minimal example that compiles and runs:
import java.awt.Color;
import java.awt.Component;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListCellRenderer;
import javax.swing.event.ListDataEvent;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableModel;
public class TableComboBoxMain {
public static void main(String[] args) {
JTableComboBox<Employee> combo = new JTableComboBox<>();
combo.addItem(new Employee("April",3));
//combo.setMaximumRowCount(10);
combo.setRenderer(new TableListCellRenderer(combo));
JFrame frame = new JFrame("Test Table Combo Box");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(combo);
frame.pack();
frame.setVisible(true);
}
public static class Employee{
String name;
int nr;
public Employee(String name, int number ){
this.name =name;
this.nr = number;
}
}
public static class JTableComboBox<E> extends JComboBox<E> implements ListSelectionListener{
#Override
public void valueChanged(ListSelectionEvent e) {System.out.println("Row selected"+e.getFirstIndex());
this.setSelectedIndex(e.getFirstIndex());
}
}
public static class TableListCellRenderer extends JScrollPane implements ListCellRenderer{
JTable table;
JTableComboBox combo;
boolean mouseListenerAdded;
public TableListCellRenderer(JTableComboBox combo){
this.combo=combo;
DefaultTableModel model = new DefaultTableModel();
String[] cols1 = new String[]{"1","2","3","4"};
String[] cols2 = new String[]{"Mark","John","April","Mary"};
model.addColumn("Nr", cols1);model.addColumn("Name",cols2);
table = new JTable(model);table.setShowGrid(true);table.setGridColor(Color.gray);
this.getViewport().add(table);
}
#Override
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
if(!mouseListenerAdded){
list.addMouseListener(this.getListener());
mouseListenerAdded = true;
}//If this is uncommented then the BasicComboPopup size is always no more than 1 row?!!
if(!combo.isPopupVisible()){
Employee emp = (Employee) value;
return new JLabel(emp.name);
}else
return this;
}
public MouseAdapter getListener(){
MouseAdapter adapter = new MouseAdapter(){
#Override
public void mousePressed(MouseEvent e) {
if(combo.isPopupVisible()){
System.out.println("MouseClicked over list");
int row = table.rowAtPoint(e.getPoint());
if(row>0){
table.setRowSelectionInterval(row-1, row-1);
ListDataEvent event = new ListDataEvent(combo,ListDataEvent.CONTENTS_CHANGED,row-1,row-1);
combo.contentsChanged(event);
}
}
}
};
return adapter;
}
}
}

So I found a solution to the problem. I am not finished yet because there are a few interactions I still want to have:
I want to be able to move columns
I want to be able have popup menu for columns
I want to be able to scroll vertically with the mouse
I wanted to post the solution in case anyone else wants a starting point example. I will update my answer as I solve these additional issues.
Below is the test class:
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JComboBox;
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.ScrollPaneConstants;
import javax.swing.event.ListDataEvent;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.plaf.basic.BasicComboBoxUI;
import javax.swing.plaf.basic.BasicComboPopup;
import javax.swing.plaf.basic.ComboPopup;
import javax.swing.table.DefaultTableModel;
public class TableComboBoxMain {
public static void main(String[] args) {
JTableComboBox<String> combo = new JTableComboBox<>();
combo.addItem("");
BasicComboBoxUI ui = new BasicComboBoxUI(){
#Override
protected ComboPopup createPopup() {
return new BasicComboPopup( comboBox ){
#Override
protected int getPopupHeightForRowCount(int maxRowCount) {
return 100;
}
#Override
protected JScrollPane createScroller() {
JScrollPane sp = new JScrollPane( list,
ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED );
sp.getHorizontalScrollBar().setFocusable( false );
return sp;
}
};
}
};
combo.setUI(ui);
combo.setRenderer(new TableListCellRenderer(combo));
JFrame frame = new JFrame("Test Table Combo Box");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(combo);
frame.pack();
frame.setVisible(true);
}
public static class Employee{
String name;
int nr;
public Employee(String name, int number ){
this.name =name;
this.nr = number;
}
}
public static class JTableComboBox<E> extends JComboBox<E> implements ListSelectionListener{
#Override
public void valueChanged(ListSelectionEvent e) {
System.out.println("Row selected"+e.getFirstIndex());
this.setSelectedIndex(e.getFirstIndex());
}
}
public static class TableListCellRenderer extends DefaultListCellRenderer{
JTable table;
JTableComboBox combo;
JPanel renderer = new JPanel();
JPanel colHeader = new JPanel();
JScrollPane scroll = new JScrollPane();
boolean mouseListenerAdded;
public TableListCellRenderer(JTableComboBox combo){
this.combo=combo;
DefaultTableModel model = new DefaultTableModel();
String[] cols1 = new String[]{"1","2","3","4","5","6"};
String[] cols2 = new String[]{"Mark","John","April","Mary","Joe","Jack"};
model.addColumn("Nr", cols1);model.addColumn("Name",cols2);
table = new JTable(model);
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
colHeader.add(table.getTableHeader());
renderer.setLayout(new BorderLayout());
renderer.add(colHeader, BorderLayout.NORTH);
renderer.add(table,BorderLayout.CENTER);
scroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
scroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER);
scroll.getViewport().add(table);
}
#Override
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
list.setFixedCellHeight(table.getRowHeight()*(table.getRowCount()+1)+10);
list.setFixedCellWidth(table.getPreferredSize().width);
JLabel label = (JLabel) super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
if(!mouseListenerAdded){
list.addMouseListener(this.getListener());
mouseListenerAdded = true;
}
if(!combo.isPopupVisible()){
label.setText("Select...");
if(table.getSelectedRowCount()>0)
label.setText(""+table.getModel().getValueAt(table.getSelectedRow(),1));
return label;
}
return scroll;
}
public MouseAdapter getListener(){
MouseAdapter adapter = new MouseAdapter(){
#Override
public void mousePressed(MouseEvent e) {
if(combo.isPopupVisible()){
System.out.println("MouseClicked over list");
int row = table.rowAtPoint(e.getPoint());
if(row>0){
table.setRowSelectionInterval(row-1, row-1);
ListDataEvent event = new ListDataEvent(combo,ListDataEvent.CONTENTS_CHANGED,row-1,row-1);
combo.contentsChanged(event);
}
}
}
};
return adapter;
}
}
}
The key parts of the solution is that in order to have the table and the features of a table that you would want in a popup is you need to override the UI. Specifically you need to override the createPopup on BasicComboBoxUI, getPopupHeightForRowCount and createScroller on BasicComboPopup. Lastly, when implementing getListCellRenderingComponent you have set a fixed height and width that matches the tables preferred height and width. This will allow the main scroller of the popup to act as the scrollpane for the table.

add JButton after last row of JTable

I searched for the answer for quite awhile , but most cases were different from mine.
I want to add a JButton directly after the last row of the table, the table is dynamic and is inside a scrollPane.
almost all of the other questions were answered with a button added after scrollPane in BorderLayout.South , which is not what i want.
thanks
updated the picture to better represent it, the button should appear inside the scrollPane just after the last row.

Read more about different LayoutManager's. Use proper manager or combination of them.
Here is simple example:
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
public class TestFrame extends JFrame {
public TestFrame() {
init();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setLocationRelativeTo(null);
setVisible(true);
}
private void init() {
JTable t = new JTable(3,3);
add(new JScrollPane(t));
JPanel btns = new JPanel(new FlowLayout(FlowLayout.LEFT,0,0));
JButton jButton = new JButton("here");
btns.add(jButton);
add(btns,BorderLayout.SOUTH);
}
public static void main(String args[]) {
new TestFrame();
}
}
EDIT:
Try to use next example:
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultCellEditor;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
public class TestFrame extends JFrame {
public TestFrame() {
init();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setLocationRelativeTo(null);
setVisible(true);
}
private void init() {
JTable t = new JTable(new DefaultTableModel(3,3){
#Override
public boolean isCellEditable(int row, int column) {
if(row == getRowCount()-1 && column != 0){
return false;
}
return super.isCellEditable(row, column);
}
});
t.setGridColor(t.getTableHeader().getBackground());
add(new JScrollPane(t));
for(int i=0;i<3;i++)
t.getColumnModel().getColumn(i).setCellRenderer(getDummyRenderer());
t.getColumnModel().getColumn(0).setCellEditor(getDummyEditor());
}
private TableCellEditor getDummyEditor() {
return new DummyEditor();
}
private TableCellRenderer getDummyRenderer() {
return new DefaultTableCellRenderer() {
#Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
if(row == table.getRowCount()-1){
if(column == 0){
return new JButton("dummy");
} else {
JLabel jLabel = new JLabel("");
jLabel.setOpaque(true);
jLabel.setBorder(null);
return jLabel;
}
} else {
Component tableCellRendererComponent = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
return tableCellRendererComponent;
}
}
};
}
public static void main(String args[]) {
new TestFrame();
}
private class DummyEditor extends DefaultCellEditor implements TableCellEditor{
private JButton btn = new JButton("dummy");
public DummyEditor(){
super(new JTextField());
btn.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
System.out.println("clicked");
}
});
}
#Override
public Component getTableCellEditorComponent(JTable table,
Object value, boolean isSelected, int row, int column) {
return row == table.getRowCount()-1 ? btn : super.getTableCellEditorComponent(table, value, isSelected, row, column);
}
}
}

Paint jtable cell editor above jtable

Designing a custom JTable I already know that DefaultCellEditor admits a JComboBox in his constructor. This JComboBox, when clicked to display the list items, shows above the other cells of the JTable. The problem is that I need a more sophisticated behavior as what JComboBox offers, so that I've implemented a JTextField with a JList and a JButton, when the JButton gets clicked (or the user enters text in the JTextField) the elements in the JList become visible. This 3 elements are in a JPanel. When I try to use this panel as a cell editor (extending AbtractCellEditor and implementing TableCellEditor) the elements in the list show inside the editing cell but I cannot mimic the behavior of the DefaultCellEditor with the combo so that the list elements show above the JTable.
Here I define the custom cell editor: (very short version);
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.AbstractCellEditor;
import javax.swing.JButton;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.TableCellEditor;
public class CustomCellEditor extends AbstractCellEditor implements TableCellEditor {
private JList list;
private JButton button;
private JTextField editor;
private JPanel mainPanel;
public CustomCellEditor() {
list = new JList(new String[] { "One", "Two", "Three" });
editor = new JTextField();
button = new JButton("Click me ");
button.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
list.setVisible(!list.isVisible());
}
});
JPanel auxPanel = new JPanel(new BorderLayout());
auxPanel.add(editor, BorderLayout.CENTER);
auxPanel.add(button, BorderLayout.EAST);
mainPanel = new JPanel(new BorderLayout());
mainPanel.add(auxPanel, BorderLayout.NORTH);
mainPanel.add(list, BorderLayout.CENTER);
}
#Override
public Object getCellEditorValue() {
return editor.getText();
}
#Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
return mainPanel;
}
}
And this a main program with a jtable with this panel as a cell editor:
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableColumn;
public class CustomTable {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
CustomTable instance = new CustomTable();
instance.createAndShowUI();
}
});
}
private void createAndShowUI() {
JTable table = new JTable(new CustomTableModel());
//So that I can see the contents of the list when edited
table.setRowHeight(60);
TableColumn editableColumn = table.getColumnModel().getColumn(0);
editableColumn.setPreferredWidth(250);
editableColumn.setCellEditor(new CustomCellEditor());
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(table, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
}
private class CustomTableModel extends AbstractTableModel {
private final String[] columnNames = {"Editable column", "Other column"};
private final Object[][] data = {
{"Ricardo", "Mr."},
{"Josefina", "Ms."}
};
#Override
public int getRowCount() {
return data.length;
}
#Override
public int getColumnCount() {
return columnNames.length;
}
#Override
public Object getValueAt(int rowIndex, int columnIndex) {
return data[rowIndex][columnIndex];
}
#Override
public boolean isCellEditable(int row, int col) {
if (0 == col)
return true;
return false;
}
#Override
public void setValueAt(Object value, int row, int col) {
data[row][col] = value;
fireTableCellUpdated(row, col);
}
}
}
Can someone help me?
Thanks!!

Using a JComboBox as a table editor relies on it being a button that displays a popup component when pressed. As you have several components in a cell, consider these alternatives:
Add the components to a panel, as shown here for a group of JRadioButton instances.
Add the components to a modal dialog, as shown here using JDialog.

JScrollpane on my custom made component is not updating

I am trying to update the scrollbar on the scrollpane automatically when going up and down in my custom made popupmenu. But it doesn´t work. Have a look at my fully runnable example below where I have added my custom JPopupMenu based component and a JComboBox to compare with. As you can see, in the JComboBox the scrollpane updates its position so the currently selected item always is visible. But that does not work with my component and I don´t know how to set that.
My SSCCE:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.ScrollPane;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Vector;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class ScrollFocus extends JFrame {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new ScrollFocus();
}
});
}
public ScrollFocus() {
this.setLayout(new BorderLayout());
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Vector<String> values = new Vector<>();
values.add("a");
values.add("b");
values.add("c");
values.add("d");
values.add("e");
values.add("f");
values.add("g");
values.add("h");
values.add("i");
values.add("j");
JComboBox<String> comboBox = new JComboBox<>(values);
JScrollPane scrollPane = new JScrollPane(comboBox);
this.add(scrollPane, BorderLayout.NORTH);
CustomTextField customTextField = new CustomTextField();
this.add(customTextField, BorderLayout.CENTER);
pack();
setVisible(true);
}
class CustomTextField extends JTextField implements FocusListener {
private CustomPopup customPopup = new CustomPopup();
public CustomTextField() {
this.addFocusListener(this);
this.addKeyListener(new KeyAdapter() {
#Override
public void keyPressed(KeyEvent e) {
System.out.println("printing...");
setPopupSize();
setPosition();
customPopup.setVisible(true);
if(e.getKeyCode() == KeyEvent.VK_UP) {
if(customPopup.index < customPopup.getListSize())
customPopup.setSelectedIndex(customPopup.index--);
}
else if(e.getKeyCode() == KeyEvent.VK_DOWN){
if(customPopup.index >= 0)
customPopup.setSelectedIndex(customPopup.index++);
}
}
});
}
public void setPopupSize() {
customPopup.setPopupSize(new Dimension(this.getWidth(), 110));
}
public void setPosition() {
customPopup.setLocation(this.getLocation().x, this.getLocation().y);
}
#Override
public void focusGained(FocusEvent e) {
}
#Override
public void focusLost(FocusEvent e) {
customPopup.setVisible(false);
}
class CustomPopup extends JPopupMenu {
String[] values = new String[]{"Value1", "Value2", "Value3", "Value4", "Value5", "Value6", "Value7",
"Value8","Value9", "Value10", "Value11", "Value12", "Value13", "Value14", "Value15", "Value16",};
JList<String> list = new JList<>(values);
JScrollPane scrollPane = new JScrollPane(list);
public int index = 0;
public CustomPopup() {
this.setLayout(new GridLayout(0,1));
this.add(scrollPane);
pack();
}
public void setSelectedIndex(int index) {
list.setSelectedIndex(index);
}
public int getListSize() {
return values.length;
}
}
}
}

in the JComboBox the scrollpane updates its position so the currently selected item always is visible. But that does not work with my component and I don´t know how to set that.
list.setSelectedIndex(index);
list.ensureIndexIsVisible(index); // added
Also, do not use a KeyListener. Swing was designed to be used with Key Bindings. Read thw section from the Swing tutorial on How to Use Key Bindings for more information.

How to get clicks on a button in a JLayeredPane in a JList

I have a button in a JLayeredPane in a JList so I can overlay icon buttons on each row on mouse over. However, the buttons are not accepting mouse clicks. The code is below. Nothing is output when clicking on anything. If I add a mouse listener to the JList, that will be called.
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;
import javax.swing.JList;
import javax.swing.SwingConstants;
import javax.swing.border.LineBorder;
public class TestListLayered
{
public static class LayeredListCellRenderer extends DefaultListCellRenderer
{
#Override
public Component getListCellRendererComponent(final JList list, final Object value, final int index,
final boolean isSelected, final boolean cellHasFocus)
{
final JLayeredPane pane = new JLayeredPane();
final JLabel label = (JLabel) super.getListCellRendererComponent(list, value.toString(), index, isSelected,
cellHasFocus);
label.setHorizontalAlignment(SwingConstants.RIGHT);
label.setBounds(0, 0, 100, 20);
pane.add(label, JLayeredPane.DEFAULT_LAYER);
final JButton edit = new JButton("e");
final FontMetrics fontMetrics = edit.getFontMetrics(edit.getFont());
final int height2 = (int) (1.5 * fontMetrics.getHeight());
edit.setBounds(0, 0, (int) (1.5 * fontMetrics.stringWidth("e")), height2);
edit.addActionListener(new ActionListener()
{
#Override
public void actionPerformed(final ActionEvent e)
{
System.out.println("button");
}
});
pane.addMouseListener(new MouseAdapter()
{
#Override
public void mouseClicked(final MouseEvent e)
{
System.out.println("layeredpane");
}
});
pane.add(edit, JLayeredPane.PALETTE_LAYER);
pane.setPreferredSize(new Dimension(-1, height2));
pane.setBorder(new LineBorder(Color.blue));
return pane;
}
}
public static void main(final String[] args)
{
final JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
final JList<String> l = new JList<String>(new String[] { "item 1", "item 2" });
l.setCellRenderer(new LayeredListCellRenderer());
f.add(l);
f.pack();
f.setVisible(true);
}
}

First, I just want to say, this is very weird...
Basically, you should add a MouseListener to the JList. When it's clicked, you need to find the cell bounds of the selected row, convert the mouse point into a local context for the cell renderer and then test to see if the mouse clicked within the bounds of the button...
What you do after that is up to you.
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FontMetrics;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.LineBorder;
public class TestListLayered {
public static class LayeredListCellRenderer extends DefaultListCellRenderer {
private JButton edit = new JButton("e");
#Override
public Component getListCellRendererComponent(final JList list, final Object value, final int index,
final boolean isSelected, final boolean cellHasFocus) {
final JLayeredPane pane = new JLayeredPane();
final JLabel label = (JLabel) super.getListCellRendererComponent(list, value.toString(), index, isSelected,
cellHasFocus);
label.setHorizontalAlignment(SwingConstants.RIGHT);
label.setBounds(0, 0, 100, 20);
pane.add(label, JLayeredPane.DEFAULT_LAYER);
final FontMetrics fontMetrics = edit.getFontMetrics(edit.getFont());
final int height2 = (int) (1.5 * fontMetrics.getHeight());
edit.setBounds(0, 0, (int) (1.5 * fontMetrics.stringWidth("e")), height2);
pane.add(edit, JLayeredPane.PALETTE_LAYER);
pane.setPreferredSize(new Dimension(-1, height2));
pane.setBorder(new LineBorder(Color.blue));
return pane;
}
protected void buttonClicked(Point p) {
System.out.println(edit.contains(p));
}
}
public static void main(final String[] args) {
new TestListLayered();
}
public TestListLayered() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
final JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JList<String> l = new JList<String>(new String[]{"item 1", "item 2"});
l.setCellRenderer(new LayeredListCellRenderer());
f.add(new JScrollPane(l));
l.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
int index = l.locationToIndex(e.getPoint());
if (index > -1) {
Rectangle bounds = l.getCellBounds(index, index);
LayeredListCellRenderer cellRenderer = (LayeredListCellRenderer) l.getCellRenderer();
Component renderComp = cellRenderer.getListCellRendererComponent(l, l.getModel().getElementAt(index), index, false, false);
renderComp.setBounds(bounds);
Point local = new Point(e.getPoint());
local.x -= bounds.x;
local.y -= bounds.y;
cellRenderer.buttonClicked(local);
}
}
});
f.pack();
f.setVisible(true);
}
});
}
}
I'd just like to say, I agree with camickr, it would be better to use a 2 column JTable...

A renderer is not a real component. It is just a painting of a component. So the button will not respond to clicks.
Not sure I understand what you are trying to do, but maybe you can use a two column JTable. Because a table supports an editor it does respond to mouse clicks. Table Button Column can help you here.