Code
JList
class CheckBoxCellRenderer<E extends CheckBoxNode> extends JCheckBox
implements ListCellRenderer<E>, MouseListener, MouseMotionListener {
private int rollOverRowIndex = -1;
@Override public Component getListCellRendererComponent(
JList<? extends E> list, E value, int index,
boolean isSelected, boolean cellHasFocus) {
this.setOpaque(true);
if (isSelected) {
this.setBackground(list.getSelectionBackground());
this.setForeground(list.getSelectionForeground());
} else {
this.setBackground(list.getBackground());
this.setForeground(list.getForeground());
}
this.setSelected(value.selected);
this.getModel().setRollover(index == rollOverRowIndex);
this.setText(value.text);
return this;
}
@Override public void mouseExited(MouseEvent e) {
if (rollOverRowIndex >= 0) {
JList<?> l = (JList<?>) e.getComponent();
l.repaint(l.getCellBounds(rollOverRowIndex, rollOverRowIndex));
rollOverRowIndex = -1;
}
}
@Override public void mouseClicked(MouseEvent e) {
if (e.getButton() == MouseEvent.BUTTON1) {
JList<?> l = (JList<?>) e.getComponent();
Point p = e.getPoint();
int index = l.locationToIndex(p);
if (index >= 0) {
@SuppressWarnings("unchecked")
DefaultListModel<CheckBoxNode> m =
(DefaultListModel<CheckBoxNode>) l.getModel();
CheckBoxNode n = m.get(index);
m.set(index, new CheckBoxNode(n.text, !n.selected));
l.repaint(l.getCellBounds(index, index));
}
}
}
@Override public void mouseMoved(MouseEvent e) {
JList<?> l = (JList<?>) e.getComponent();
int index = l.locationToIndex(e.getPoint());
if (index != rollOverRowIndex) {
rollOverRowIndex = index;
l.repaint();
}
}
@Override public void mouseEntered(MouseEvent e) {
/* not needed */
}
@Override public void mousePressed(MouseEvent e) {
/* not needed */
}
@Override public void mouseReleased(MouseEvent e) {
/* not needed */
}
@Override public void mouseDragged(MouseEvent e) {
/* not needed */
}
}
// ...
JList list1 = new JList(model) {
private CheckBoxCellRenderer renderer;
@Override public void updateUI() {
setForeground(null);
setBackground(null);
setSelectionForeground(null);
setSelectionBackground(null);
if (renderer != null) {
removeMouseListener(renderer);
removeMouseMotionListener(renderer);
}
super.updateUI();
renderer = new CheckBoxCellRenderer();
setCellRenderer(renderer);
addMouseListener(renderer);
addMouseMotionListener(renderer);
}
// @see SwingUtilities2.pointOutsidePrefSize(...)
private boolean pointOutsidePrefSize(Point p) {
int index = locationToIndex(p);
DefaultListModel m = (DefaultListModel) getModel();
CheckBoxNode n = (CheckBoxNode) m.get(index);
Component c = getCellRenderer().getListCellRendererComponent(
this, n, index, false, false);
// c.doLayout();
Dimension d = c.getPreferredSize();
Rectangle rect = getCellBounds(index, index);
rect.width = d.width;
return index < 0 || !rect.contains(p);
}
@Override protected void processMouseEvent(MouseEvent e) {
if (!pointOutsidePrefSize(e.getPoint())) {
super.processMouseEvent(e);
}
}
@Override protected void processMouseMotionEvent(MouseEvent e) {
if (!pointOutsidePrefSize(e.getPoint())) {
super.processMouseMotionEvent(e);
} else {
e = new MouseEvent(
(Component) e.getSource(), MouseEvent.MOUSE_EXITED, e.getWhen(),
e.getModifiers(), e.getX(), e.getY(),
e.getXOnScreen(), e.getYOnScreen(),
e.getClickCount(), e.isPopupTrigger(), MouseEvent.NOBUTTON);
super.processMouseEvent(e);
}
}
};
JTree
class CheckBoxNodeRenderer extends JCheckBox implements TreeCellRenderer {
private TreeCellRenderer renderer = new DefaultTreeCellRenderer();
@Override public Component getTreeCellRendererComponent(
JTree tree, Object value, boolean selected, boolean expanded,
boolean leaf, int row, boolean hasFocus) {
if (leaf && value instanceof DefaultMutableTreeNode) {
this.setOpaque(false);
Object userObject = ((DefaultMutableTreeNode) value).getUserObject();
if (userObject instanceof CheckBoxNode) {
CheckBoxNode node = (CheckBoxNode) userObject;
this.setText(node.text);
this.setSelected(node.selected);
}
return this;
}
return renderer.getTreeCellRendererComponent(
tree, value, selected, expanded, leaf, row, hasFocus);
}
}
class CheckBoxNodeEditor extends JCheckBox implements TreeCellEditor {
private final JTree tree;
public CheckBoxNodeEditor(JTree tree) {
super();
this.tree = tree;
setOpaque(false);
setFocusable(false);
addActionListener(new ActionListener() {
@Override public void actionPerformed(ActionEvent e) {
stopCellEditing();
}
});
}
@Override public Component getTreeCellEditorComponent(
JTree tree, Object value, boolean isSelected, boolean expanded,
boolean leaf, int row) {
if (leaf && value instanceof DefaultMutableTreeNode) {
Object userObject = ((DefaultMutableTreeNode) value).getUserObject();
if (userObject instanceof CheckBoxNode) {
this.setSelected(((CheckBoxNode) userObject).selected);
} else {
this.setSelected(false);
}
this.setText(value.toString());
}
return this;
}
@Override public Object getCellEditorValue() {
return new CheckBoxNode(getText(), isSelected());
}
@Override public boolean isCellEditable(EventObject e) {
return (e instanceof MouseEvent);
}
// Copied from AbstractCellEditor
// protected EventListenerList listenerList = new EventListenerList();
// transient protected ChangeEvent changeEvent = null;
@Override public boolean shouldSelectCell(EventObject anEvent) {
// ...
References
