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MainPanel.java
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/
MainPanel.java
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// -*- mode:java; encoding:utf-8 -*-
// vim:set fileencoding=utf-8:
// @homepage@
package example;
import java.awt.*;
import java.awt.event.MouseEvent;
import javax.swing.*;
import javax.swing.plaf.LayerUI;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new BorderLayout());
ComboBoxModel<String> model = new DefaultComboBoxModel<>(new String[] {"aaa", "bb", "c"});
JComboBox<String> combo = makeComboBox(model);
combo.setEditable(true);
JPanel p = new JPanel(new GridLayout(0, 1, 5, 5));
p.setBorder(BorderFactory.createEmptyBorder(5, 20, 5, 20));
p.add(new JLabel("setEditable(true)"));
p.add(new JLayer<>(combo, new ToolTipLayerUI<>()));
p.add(Box.createVerticalStrut(10));
p.add(new JLabel("setEditable(false)"));
p.add(new JLayer<>(makeComboBox(model), new ToolTipLayerUI<>()));
add(p, BorderLayout.NORTH);
setPreferredSize(new Dimension(320, 240));
}
private static <E> JComboBox<E> makeComboBox(ComboBoxModel<E> model) {
return new JComboBox<E>(model) {
@Override public void updateUI() {
setRenderer(null);
super.updateUI();
ListCellRenderer<? super E> renderer = getRenderer();
setRenderer((list, value, index, isSelected, cellHasFocus) -> {
Component c = renderer.getListCellRendererComponent(
list, value, index, isSelected, cellHasFocus);
if (c instanceof JComponent) {
((JComponent) c).setToolTipText(String.format("Item%d: %s", index, value));
}
return c;
});
}
};
}
public static void main(String[] args) {
EventQueue.invokeLater(MainPanel::createAndShowGui);
}
private static void createAndShowGui() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
UIManager.put("example.SearchBarComboBox", "SearchBarComboBoxUI");
UIManager.put("SearchBarComboBoxUI", "example.BasicSearchBarComboBoxUI");
} catch (UnsupportedLookAndFeelException ignored) {
Toolkit.getDefaultToolkit().beep();
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException ex) {
ex.printStackTrace();
return;
}
JFrame frame = new JFrame("@title@");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new MainPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
class ToolTipLayerUI<V extends JComboBox<?>> extends LayerUI<V> {
@Override public void installUI(JComponent c) {
super.installUI(c);
if (c instanceof JLayer) {
((JLayer<?>) c).setLayerEventMask(AWTEvent.MOUSE_MOTION_EVENT_MASK);
}
}
@Override public void uninstallUI(JComponent c) {
if (c instanceof JLayer) {
((JLayer<?>) c).setLayerEventMask(0);
}
super.uninstallUI(c);
}
@Override protected void processMouseMotionEvent(MouseEvent e, JLayer<? extends V> l) {
JComboBox<?> c = l.getView();
if (e.getComponent() instanceof JButton) {
c.setToolTipText("ArrowButton");
} else {
c.setToolTipText("JComboBox: " + c.getSelectedItem());
}
super.processMouseMotionEvent(e, l);
}
}