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基本上是其衍生的JTextField下面顯示的JComboBox彈出，如何從怒吼取向爲JcomboBox的彈出改變方向並在頂/顯示JcomboBox的彈出超過該JComboBox的變化下拉彈出
編輯：用於代碼示例基本JComboBox
import java.awt.Dimension;
import javax.swing.*;
import javax.swing.plaf.basic.BasicComboBoxRenderer;
public class HighRowCombo {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new HighRowCombo().makeUI();
}
});
}
public void makeUI() {
Object[] data = {"One", "Two with text", "Three with long text, with long text,with long text "};
JComboBox comboBox = new JComboBox(data);
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.add(comboBox);
frame.pack();
BasicComboBoxRenderer renderer = (BasicComboBoxRenderer) comboBox.getRenderer();
Dimension size = renderer.getPreferredSize();
size.height += 50;
renderer.setPreferredSize(size);
frame.setVisible(true);
}
}
編輯第二。代碼MacOX
import java.awt.*;
import javax.swing.*;
public class TestHighRow {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
} catch (Exception e) {
e.printStackTrace();
}
new TestHighRow().makeUI();
}
});
}
public void makeUI() {
Object[] data = {"One", "Two", "Three"};
JComboBox comboBox = new JComboBox(data);
comboBox.setPreferredSize(comboBox.getPreferredSize());
comboBox.setRenderer(new HighRowRenderer(comboBox.getRenderer()));
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(comboBox);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static class HighRowRenderer implements ListCellRenderer {
private final ListCellRenderer delegate;
private int height = -1;
public HighRowRenderer(ListCellRenderer delegate) {
this.delegate = delegate;
}
@Override
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
Component component = delegate.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
Dimension size = component.getPreferredSize();
if (height == -1) {
height = size.height + 50;
}
size.height = height;
component.setPreferredSize(size);
if (component instanceof JLabel) {
((JLabel) component).setHorizontalTextPosition(JLabel.CENTER);
}
return component;
}
}
}
我（的JPanel，BorderLayout.SOUTH）爲狀態欄funkcionalities這是包含的JComboBox和我 「想」 換行/粘JcomboBox的內JFrame的彈出:-) – mKorbel 2011-06-05 11:10:04