如何从渲染器中的 JCombobox 获取数据？

Question

我需要开发带有弹出列表的自动完成组合框。该列表的每一行都应突出显示输入自动完成数据。
我使用 glazedlists 进行自动完成。但最困扰我的是如何在渲染器中突出显示输入的组合框数据？
应该是这个样子


更新：
我只想知道如何将输入的字符串从 jcombobox 编辑器发送到列表渲染器。我是否使用 glazedlists 并不重要。

不知何故，我发现我可以将组合框发送到渲染器并从渲染器中的组合框获取信息。但问题是我需要比现在更频繁地调用 getListCellRendererComponent。有谁知道，如何让组合框调用渲染器 getListCellRendererComponent 更频繁？

Answer 1

这是可能的。但是有点辛苦。
这是我发现的用于更改 JList 元素的示例代码。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

class ListDemo extends JPanel {
    private JList list;
    private DefaultListModel listModel;
    public String match = null;

    private static final String hireString = "Highlight";
    private JTextField employeeName;

    public ListDemo() {
        super(new BorderLayout());

        listModel = new DefaultListModel();
        listModel.addElement("Test1");
        listModel.addElement("Test2");
        listModel.addElement("Test3");

        list = new JList(listModel);
        list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        list.setSelectedIndex(0);
        list.setVisibleRowCount(5);
        list.setCellRenderer(new MyListCellRenderer());
        JScrollPane listScrollPane = new JScrollPane(list);

        JButton hireButton = new JButton(hireString);
        HireListener hireListener = new HireListener(hireButton);
        hireButton.setActionCommand(hireString);
        hireButton.addActionListener(hireListener);
        hireButton.setEnabled(false);

        employeeName = new JTextField(10);
        employeeName.addActionListener(hireListener);
        employeeName.getDocument().addDocumentListener(hireListener);

        JPanel buttonPane = new JPanel();
        buttonPane.setLayout(new BoxLayout(buttonPane,
                                           BoxLayout.LINE_AXIS));
        buttonPane.add(Box.createHorizontalStrut(5));
        buttonPane.add(employeeName);
        buttonPane.add(hireButton);
        buttonPane.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));

        add(listScrollPane, BorderLayout.CENTER);
        add(buttonPane, BorderLayout.PAGE_END);
    }
    class MyListCellRenderer extends JLabel implements ListCellRenderer { // extended from JLabel. You can use an appropriate JComponent.
        public MyListCellRenderer() {
            setOpaque(true);
        }
        public Component getListCellRendererComponent(JList paramlist, Object value, int index, boolean isSelected, boolean cellHasFocus) {
            setText(value.toString());
            if (value.toString().equals(match)) {
                setBackground(Color.BLUE);
                SwingWorker worker = new SwingWorker() {
                    @Override
                    public Object doInBackground() {
                        try {
                            Thread.sleep(5000);
                        } catch (InterruptedException e) { /*Who cares*/ }
                        return null;
                    }
                    @Override
                    public void done() {
                        match = null;
                        list.repaint();
                    }
                };
                worker.execute();
            } else
                setBackground(Color.RED);
            return this;
        }
    }
    class HireListener implements ActionListener, DocumentListener {
        private boolean alreadyEnabled = false;
        private JButton button;
        public HireListener(JButton button) {
            this.button = button;
        }
        public void actionPerformed(ActionEvent e) {
            String name = employeeName.getText();
            if (listModel.contains(name)) {
                match = name;
                list.repaint();
                employeeName.requestFocusInWindow();
                employeeName.selectAll();
                return;
            }
            if (name.equals("")) {
                Toolkit.getDefaultToolkit().beep();
                employeeName.requestFocusInWindow();
                employeeName.selectAll();
                return;
            }
            int index = list.getSelectedIndex();
            if (index == -1)
                index = 0;
            else
                index++;
            listModel.insertElementAt(employeeName.getText(), index);
            employeeName.requestFocusInWindow();
            employeeName.setText("");
            list.setSelectedIndex(index);
            list.ensureIndexIsVisible(index);
        }
        public void insertUpdate(DocumentEvent e) {
            enableButton();
        }
        public void removeUpdate(DocumentEvent e) {
            handleEmptyTextField(e);
        }
        public void changedUpdate(DocumentEvent e) {
            if (!handleEmptyTextField(e))
                enableButton();
        }
        private void enableButton() {
            if (!alreadyEnabled)
                button.setEnabled(true);
        }
        private boolean handleEmptyTextField(DocumentEvent e) {
            if (e.getDocument().getLength() <= 0) {
                button.setEnabled(false);
                alreadyEnabled = false;
                return true;
            }
            return false;
        }
    }
    private static void createAndShowGUI() {
        JFrame frame = new JFrame("ListDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JComponent newContentPane = new ListDemo();
        newContentPane.setOpaque(true);
        frame.setContentPane(newContentPane);
        frame.pack();
        frame.setVisible(true);
    }
    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() { createAndShowGUI(); }
        });
    }
}

如果你对java有点好，你会清楚地了解这里做了什么。
（抱歉，我找不到此代码的链接。刚刚复制了我的本地代码。） 并且你可以使用你的上釉师的getComboBox()方法得到对应的JComboBox和;

JList l = new JList();
l.setModel(glazedlist1.getComboBox().getModel()); // glazedlist1 -> your auto complete list

将该组合框的模型分配给新的JList。
您可以将class MyListCellRenderer extends JLabel implements... 的扩展名更改为JTextPane 或JEditorPane 以分别格式化文本。
希望这会有所帮助。
抱歉，代码不完整。