java java中的jcombobox过滤器 - 外观独立

jcombobox filter in java - Look and feel independent

提问by gtiwari333

I have a simple JComboBox filter code like this :

我有一个简单的 JComboBox 过滤器代码，如下所示：

import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.ArrayList;
import java.util.List;

import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class FilterComboBox extends JComboBox {
    private List<String> array;

    public FilterComboBox(List<String> array) {
        super(array.toArray());
        this.array = array;
        this.setEditable(true);
        final JTextField textfield = (JTextField) this.getEditor().getEditorComponent();
        textfield.addKeyListener(new KeyAdapter() {
            public void keyReleased(KeyEvent ke) {
                SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        comboFilter(textfield.getText());
                    }
                });
            }
        });

    }

    public void comboFilter(String enteredText) {
        List<String> filterArray= new ArrayList<String>();
        for (int i = 0; i < array.size(); i++) {
            if (array.get(i).toLowerCase().contains(enteredText.toLowerCase())) {
                filterArray.add(array.get(i));
            }
        }
        if (filterArray.size() > 0) {
            this.setModel(new DefaultComboBoxModel(filterArray.toArray()));
            this.setSelectedItem(enteredText);
            this.showPopup();
        }
        else {
            this.hidePopup();
        }
    }

    /* Testing Codes */
    public static List<String> populateArray() {
        List<String> test = new ArrayList<String>();
        test.add("");
        test.add("Mountain Flight");
        test.add("Mount Climbing");
        test.add("Trekking");
        test.add("Rafting");
        test.add("Jungle Safari");
        test.add("Bungie Jumping");
        test.add("Para Gliding");
        return test;
    }

    public static void makeUI() {
        JFrame frame = new JFrame("Adventure in Nepal - Combo Filter Test");
        FilterComboBox acb = new FilterComboBox(populateArray());
        frame.getContentPane().add(acb);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public static void main(String[] args) throws Exception {

        //UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
        makeUI();
    }
}

The performance of the combo filter is not so good but it is fine for few data set. My problem is - when I remove the comment UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");to change look and feel, the filter doesn't work. In WindowsLookAndFeel, the combo box only takes single character in it by replacing the previously entered character.

组合过滤器的性能不是很好，但对于少数数据集来说很好。我的问题是 - 当我删除评论UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");以更改外观时，过滤器不起作用。在 WindowsLookAndFeel 中，组合框通过替换之前输入的字符来只接收其中的单个字符。

Can you please tell me whats going on? Manoj Shrestha's answer belowhelps in some way but , can you please provide some other suggestions to achieve combo box filter in Java?

你能告诉我这是怎么回事吗？Manoj Shrestha 在下面的回答在某种程度上有所帮助，但是，您能否提供一些其他建议以在 Java 中实现组合框过滤器？

回答by Ashwinee K Jha

Firstly you are creating new model everytime and then invoking show popup from code which leads to flickering etc. We can modify the model itself. Secondly you set the currently entered text as selected item which seems to have selectAll behavior as noted by others. I have modified the code as follows:

首先，您每次都在创建新模型，然后从代码中调用显示弹出窗口，这会导致闪烁等。我们可以修改模型本身。其次，您将当前输入的文本设置为所选项目，该项目似乎具有其他人指出的 selectAll 行为。我修改了代码如下：

public void comboFilter(String enteredText) {
    if (!this.isPopupVisible()) {
        this.showPopup();
    }

    List<String> filterArray= new ArrayList<String>();
    for (int i = 0; i < array.size(); i++) {
        if (array.get(i).toLowerCase().contains(enteredText.toLowerCase())) {
            filterArray.add(array.get(i));
        }
    }
    if (filterArray.size() > 0) {
        DefaultComboBoxModel model = (DefaultComboBoxModel) this.getModel();
        model.removeAllElements();
        for (String s: filterArray)
            model.addElement(s);

        JTextField textfield = (JTextField) this.getEditor().getEditorComponent();
        textfield.setText(enteredText);
    }
}

Hope it works for you.

希望对你有效。

回答by mKorbel

very long answer, I think that exelent example about how different Look and Feel have got implemented methods in API and works

很长的答案，我认为关于不同的外观和感觉如何在 API 中实现方法并起作用的优秀示例

• KeyListener isn't proper Listener for Swing JComponents, you really to have bothering with KeyBindings,

• KeyListener is simple asynchronous,

• JComboBox is Compound JComponent, then there is required override internal JComponents, all output from KeyListener must be wrapped into invokeLater(), notice I can create event from coumpond JComponents that twice invokeLater() doesn't returns expected output to the GUI, only Swing Timer with Swing Action can do that correctly, simple why to bothering wiht that example about wrong way,

• KeyListener 不是 Swing JComponents 的正确侦听器，您真的需要为 KeyBindings 烦恼，

• KeyListener 是简单的异步，

• JComboBox 是复合 JComponent，然后需要覆盖内部 JComponents，所有来自 KeyListener 的输出必须包装到 invokeLater() 中，注意我可以从两次 invokeLater() 不会将预期输出返回到 GUI 的组合 JComponents 创建事件，只有 Swing带有 Swing Action 的 Timer 可以正确地做到这一点，很简单，为什么要为错误方式的示例而烦恼，

code

代码

import java.awt.Component;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.plaf.basic.BasicComboBoxRenderer;

public class ComboBoxHoverOver {

    private JComboBox combo = new JComboBox();

    public ComboBoxHoverOver() {
        combo.setPrototypeDisplayValue("XXXXXXXXXXXXXXXXXXXXXX");
        combo.setRenderer(new ComboToolTipRenderer(combo));
        combo.addItemListener(new ItemListener() {

            @Override
            public void itemStateChanged(ItemEvent e) {
                //System.out.println(combo.getSelectedItem().toString());
            }
        });
        combo.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                //System.out.println(combo.getSelectedItem().toString());
            }
        });
        combo.addItem("");
        combo.addItem("Long text 4");
        combo.addItem("Long text 3");
        combo.addItem("Long text 2");
        combo.addItem("Long text 1");
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(combo);
        f.pack();
        f.setVisible(true);
    }

    private class ComboToolTipRenderer extends BasicComboBoxRenderer {

        private static final long serialVersionUID = 1L;
        private JComboBox combo;
        private JList comboList;

        ComboToolTipRenderer(JComboBox combo) {
            this.combo = combo;
        }

        @Override
        public Component getListCellRendererComponent(JList list, Object value,
                int index, boolean isSelected, boolean cellHasFocus) {
            super.getListCellRendererComponent(
                    list, value, index, isSelected, cellHasFocus);
            if (comboList == null) {
                comboList = list;
                KeyAdapter listener = new KeyAdapter() {

                    @Override
                    public void keyReleased(KeyEvent e) {
                        if (e.getKeyCode() == KeyEvent.VK_DOWN || e.getKeyCode() == KeyEvent.VK_UP) {
                            int x = 5;
                            int y = comboList.indexToLocation(comboList.getSelectedIndex()).y;
                            System.out.println(comboList.getSelectedIndex());
                        }
                    }
                };
                combo.addKeyListener(listener);
                combo.getEditor().getEditorComponent().addKeyListener(listener);
            }
            if (isSelected) {
                //System.out.println(value.toString());
            }
            return this;
        }
    }

    public static void main(String[] args) throws ClassNotFoundException,
            InstantiationException, IllegalAccessException, UnsupportedLookAndFeelException {
        UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                ComboBoxHoverOver comboBoxHoverOver = new ComboBoxHoverOver();
            }
        });
    }
}

• JComboBox is Compound JComponent, then there is required override BasicComboBoxUI, please sorry I lazy to write and simulating too much longer code as code from first point

• otherwise all effort from above two point are useless and contraproductive, nothing else, only DOT

• JComboBox 是复合 JComponent，然后需要覆盖 BasicComboBoxUI，请原谅我懒得从第一点开始编写和模拟太长的代码作为代码

• 否则以上两点的努力都是徒劳且适得其反的，没有别的，只有DOT

---

---

please can someone to test follows code in *nix and apple OS X

请有人在 *nix 和苹果 OS X 中测试以下代码

from my Java6 WinXP compo (all important is hidden in the used methods, enless kudos for anonymous author from former Sun Microsystems)

来自我的 Java6 WinXP 组合（所有重要的都隐藏在使用的方法中，前 Sun Microsystems 的匿名作者不胜感激）

Substance L&F

物质 L&F

WindowsLookAndFeel L&F

WindowsLookAndFeel L&F

Nimbus L&F

Nimbus L&F

Metal L&F

金属低频

from Java Classes

从 Java 类

main

主要的

import java.awt.*;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.UIManager.LookAndFeelInfo;
import org.pushingpixels.substance.api.skin.SubstanceOfficeSilver2007LookAndFeel;

public class AutoCompleteTextField {

    private static JFrame frame = new JFrame();
    private ArrayList<String> listSomeString = new ArrayList<String>();
    private Java2sAutoTextField someTextField = new Java2sAutoTextField(listSomeString);
    private ArrayList<String> listSomeAnotherString = new ArrayList<String>();
    private Java2sAutoComboBox someComboBox = new Java2sAutoComboBox(listSomeAnotherString);

    public AutoCompleteTextField() {
        listSomeString.add("-");
        listSomeString.add("Snowboarding");
        listSomeString.add("Rowing");
        listSomeString.add("Knitting");
        listSomeString.add("Speed reading");
        listSomeString.add("Pool");
        listSomeString.add("None of the above");
//
        listSomeAnotherString.add("-");
        listSomeAnotherString.add("XxxZxx Snowboarding");
        listSomeAnotherString.add("AaaBbb Rowing");
        listSomeAnotherString.add("CccDdd Knitting");
        listSomeAnotherString.add("Eee Fff Speed reading");
        listSomeAnotherString.add("Eee Fff Pool");
        listSomeAnotherString.add("Eee Fff None of the above");
//
        someTextField.setFont(new Font("Serif", Font.BOLD, 16));
        someTextField.setForeground(Color.black);
        someTextField.setBackground(Color.orange);
        someTextField.setName("someTextField");
        someTextField.setDataList(listSomeString);
//
        someComboBox.setPrototypeDisplayValue("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
        someComboBox.setFont(new Font("Serif", Font.BOLD, 16));
        someComboBox.setForeground(Color.black);
        someComboBox.setBackground(Color.YELLOW);
        someComboBox.getEditor().selectAll();
        someComboBox.getEditor().getEditorComponent().setBackground(Color.YELLOW);
        ((JTextField) someComboBox.getEditor().getEditorComponent()).setDisabledTextColor(Color.black);
        someComboBox.setName("someComboBox");
        someComboBox.setDataList(listSomeAnotherString);
//
        frame.setLayout(new GridLayout(0, 1, 10, 10));
        frame.add(someTextField);
        frame.add(someComboBox);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocation(100, 100);
        frame.pack();
        frame.setVisible(true);
//
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                someTextField.setText("-");
                someComboBox.getEditor().setItem(0);
                someComboBox.getEditor().selectAll();
                someTextField.grabFocus();
                someTextField.requestFocus();
                someTextField.setText(someTextField.getText());
                someTextField.selectAll();
            }
        });

    }

    public static void main(String[] args) {
        /*SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                try {
                    UIManager.setLookAndFeel(new SubstanceOfficeSilver2007LookAndFeel());
                    SwingUtilities.updateComponentTreeUI(frame);
                } catch (UnsupportedLookAndFeelException e) {
                    throw new RuntimeException(e);
                }
            }
        });*/
        /*try {
            UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
            for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
            System.out.println(info.getName());
            if ("Nimbus".equals(info.getName())) {
            UIManager.setLookAndFeel(info.getClassName());
            break;
            }
            }
        } catch (UnsupportedLookAndFeelException e) {
            // handle exception
        } catch (ClassNotFoundException e) {
            // handle exception
        } catch (InstantiationException e) {
            // handle exception
        } catch (IllegalAccessException e) {
            // handle exception
        }*/
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                AutoCompleteTextField aCTF = new AutoCompleteTextField();
            }
        });
    }
}

AutoComboBox

自动组合框

import java.awt.event.ItemEvent;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.plaf.basic.BasicComboBoxEditor;

public class Java2sAutoComboBox extends JComboBox {

    private static final long serialVersionUID = 1L;
    private AutoTextFieldEditor autoTextFieldEditor;
    private boolean isFired;

    private class AutoTextFieldEditor extends BasicComboBoxEditor {

        private Java2sAutoTextField getAutoTextFieldEditor() {
            return (Java2sAutoTextField) editor;
        }

        AutoTextFieldEditor(java.util.List<String> list) {
            editor = new Java2sAutoTextField(list, Java2sAutoComboBox.this);
        }
    }

    public Java2sAutoComboBox(java.util.List<String> list) {
        isFired = false;
        autoTextFieldEditor = new AutoTextFieldEditor(list);
        setEditable(true);
        setModel(new DefaultComboBoxModel(list.toArray()) {

            private static final long serialVersionUID = 1L;

            @Override
            protected void fireContentsChanged(Object obj, int i, int j) {
                if (!isFired) {
                    super.fireContentsChanged(obj, i, j);
                }
            }
        });
        setEditor(autoTextFieldEditor);
    }

    public boolean isCaseSensitive() {
        return autoTextFieldEditor.getAutoTextFieldEditor().isCaseSensitive();
    }

    public void setCaseSensitive(boolean flag) {
        autoTextFieldEditor.getAutoTextFieldEditor().setCaseSensitive(flag);
    }

    public boolean isStrict() {
        return autoTextFieldEditor.getAutoTextFieldEditor().isStrict();
    }

    public void setStrict(boolean flag) {
        autoTextFieldEditor.getAutoTextFieldEditor().setStrict(flag);
    }

    public java.util.List<String> getDataList() {
        return autoTextFieldEditor.getAutoTextFieldEditor().getDataList();
    }

    public void setDataList(java.util.List<String> list) {
        autoTextFieldEditor.getAutoTextFieldEditor().setDataList(list);
        setModel(new DefaultComboBoxModel(list.toArray()));
    }

    void setSelectedValue(Object obj) {
        if (isFired) {
            return;
        } else {
            isFired = true;
            setSelectedItem(obj);
            fireItemStateChanged(new ItemEvent(this, 701, selectedItemReminder, 1));
            isFired = false;
            return;
        }
    }

    @Override
    protected void fireActionEvent() {
        if (!isFired) {
            super.fireActionEvent();
        }
    }
}

AutoTextField

自动文本框

import java.util.List;
import javax.swing.JTextField;
import javax.swing.text.*;

public class Java2sAutoTextField extends JTextField {

    private static final long serialVersionUID = 1L;
    private List<String> dataList;
    private boolean isCaseSensitive;
    private boolean isStrict;
    private Java2sAutoComboBox autoComboBox;

    public class AutoDocument extends PlainDocument {

        private static final long serialVersionUID = 1L;

        @Override
        public void replace(int i, int j, String s, AttributeSet attributeset)
                throws BadLocationException {
            super.remove(i, j);
            insertString(i, s, attributeset);
        }

        @Override
        public void insertString(int i, String s, AttributeSet attributeset)
                throws BadLocationException {
            if (s == null || "".equals(s)) {
                return;
            }
            String s1 = getText(0, i);
            String s2 = getMatch(s1 + s);
            int j = (i + s.length()) - 1;
            if (isStrict && s2 == null) {
                s2 = getMatch(s1);
                j--;
            } else if (!isStrict && s2 == null) {
                super.insertString(i, s, attributeset);
                return;
            }
            if (autoComboBox != null && s2 != null) {
                autoComboBox.setSelectedValue(s2);
            }
            super.remove(0, getLength());
            super.insertString(0, s2, attributeset);
            setSelectionStart(j + 1);
            setSelectionEnd(getLength());
        }

        @Override
        public void remove(int i, int j) throws BadLocationException {
            int k = getSelectionStart();
            if (k > 0) {
                k--;
            }
            String s = getMatch(getText(0, k));
            if (!isStrict && s == null) {
                super.remove(i, j);
            } else {
                super.remove(0, getLength());
                super.insertString(0, s, null);
            }
            if (autoComboBox != null && s != null) {
                autoComboBox.setSelectedValue(s);
            }
            try {
                setSelectionStart(k);
                setSelectionEnd(getLength());
            } catch (Exception exception) {
            }
        }
    }

    public Java2sAutoTextField(List<String> list) {
        isCaseSensitive = false;
        isStrict = true;
        autoComboBox = null;
        if (list == null) {
            throw new IllegalArgumentException("values can not be null");
        } else {
            dataList = list;
            init();
            return;
        }
    }

    Java2sAutoTextField(List<String> list, Java2sAutoComboBox b) {
        isCaseSensitive = false;
        isStrict = true;
        autoComboBox = null;
        if (list == null) {
            throw new IllegalArgumentException("values can not be null");
        } else {
            dataList = list;
            autoComboBox = b;
            init();
            return;
        }
    }

    private void init() {
        setDocument(new AutoDocument());
        if (isStrict && dataList.size() > 0) {
            setText(dataList.get(0).toString());
        }
    }

    private String getMatch(String s) {
        for (int i = 0; i < dataList.size(); i++) {
            String s1 = dataList.get(i).toString();
            if (s1 != null) {
                if (!isCaseSensitive
                        && s1.toLowerCase().startsWith(s.toLowerCase())) {
                    return s1;
                }
                if (isCaseSensitive && s1.startsWith(s)) {
                    return s1;
                }
            }
        }

        return null;
    }

    @Override
    public void replaceSelection(String s) {
        AutoDocument _lb = (AutoDocument) getDocument();
        if (_lb != null) {
            try {
                int i = Math.min(getCaret().getDot(), getCaret().getMark());
                int j = Math.max(getCaret().getDot(), getCaret().getMark());
                _lb.replace(i, j - i, s, null);
            } catch (Exception exception) {
            }
        }
    }

    public boolean isCaseSensitive() {
        return isCaseSensitive;
    }

    public void setCaseSensitive(boolean flag) {
        isCaseSensitive = flag;
    }

    public boolean isStrict() {
        return isStrict;
    }

    public void setStrict(boolean flag) {
        isStrict = flag;
    }

    public List<String> getDataList() {
        return dataList;
    }

    public void setDataList(List<String> list) {
        if (list == null) {
            throw new IllegalArgumentException("values can not be null");
        } else {
            dataList = list;
            return;
        }
    }
}

EDIT

编辑

output from Win7 64b / Java7

Win7 64b / Java7 的输出

Metal L&F

金属低频

Windows L&F (funny empty white space near Button in JComboBox)

Windows L&F（JComboBox 中按钮附近有趣的空白区域）

Nimbus L&F

Nimbus L&F

feel free for edit(s)

随意编辑

回答by Dudelilama

This component is called autocomplete and is included in a so called swing extensions porject.

该组件称为自动完成并包含在所谓的摆动扩展项目中。

Just have a look at: http://swingx.java.net/
There is a webstart: http://swinglabs-demos.java.net/demos/swingxset6/swingxset.jnlp

看看：http: //swingx.java.net/
有一个 webstart：http: //swinglabs-demos.java.net/demos/swingxset6/swingxset.jnlp

Autocomplete is the Menu to select. Have fun and less error prone code :)

自动完成是要选择的菜单。玩得开心且不易出错的代码:)

回答by G.Srinivas Kishan

obviously the glitch is in the textfield component used. What happens is, when windows look and feel is used , the text in this component is selected just as using the line "textfield.selectAll();", and hence when you type anything else the selected text is cleared form the textfield component. So in the below code the caret position of this component is adjusted. This is how it works, first store the current caret position of text field in a variable "currentCaretPosition", then move the caret position to the beginning in the text in the component. After filtering restoring the caret position back to the "currentCaretPosition" variable value. I hope it works as you want it to.

显然，故障出在所使用的文本字段组件中。发生的情况是，当使用 windows 外观和感觉时，该组件中的文本就像使用“textfield.selectAll();”行一样被选中，因此当您键入任何其他内容时，所选文本将从文本字段组件中清除。所以在下面的代码中，这个组件的插入位置被调整。这是它的工作原理，首先将文本字段的当前插入符号位置存储在变量“currentCaretPosition”中，然后将插入符号位置移动到组件中文本的开头。过滤后将插入符号位置恢复到“currentCaretPosition”变量值。我希望它能如你所愿。

The refined code is given below:-

改进后的代码如下：-

                                       /****Beginning of code****/
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.ArrayList;
import java.util.List;

import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class FilterComboBox extends JComboBox {
    private List<String> array;
    private int currentCaretPosition=0;


    public FilterComboBox(List<String> array) {
        super(array.toArray());
        this.array = array;
        this.setEditable(true);
        final JTextField textfield = (JTextField) this.getEditor().getEditorComponent();
        textfield.addKeyListener(new KeyAdapter() {
            public void keyPressed(KeyEvent ke) {
                SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        currentCaretPosition=textfield.getCaretPosition();
                        if(textfield.getSelectedText()==null)
                        {
                        textfield.setCaretPosition(0);
                        comboFilter(textfield.getText());
                        textfield.setCaretPosition(currentCaretPosition);
                        }
                     }
                });
            }

        });

    }

    public void comboFilter(String enteredText) {
        List<String> filterArray= new ArrayList<String>();
        for (int i = 0; i < array.size(); i++) {
            if (array.get(i).toLowerCase().contains(enteredText.toLowerCase())) {
                filterArray.add(array.get(i));
            }


        }
        if (filterArray.size() > 0) {

            this.setModel(new DefaultComboBoxModel(filterArray.toArray()));
            this.setSelectedItem(enteredText);
            this.showPopup();
        }
        else {
            this.hidePopup();
        }
    }

    /* Testing Codes */
    public static List<String> populateArray() {
        List<String> test = new ArrayList<String>();
        test.add("");
        test.add("Mountain Flight");
        test.add("Mount Climbing");
        test.add("Trekking");
        test.add("Rafting");
        test.add("Jungle Safari");
        test.add("Bungie Jumping");
        test.add("Para Gliding");
        return test;
    }

    public static void makeUI() {
        JFrame frame = new JFrame("Adventure in Nepal - Combo Filter Test");
        FilterComboBox acb = new FilterComboBox(populateArray());
        frame.getContentPane().add(acb);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public static void main(String[] args) throws Exception {

        UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
        makeUI();
    }
}


                                       /******* End of code**********/

回答by Manoj Shrestha

It looks like, as you mentioned, when user inputs any texts in combobox, the Windows Look & Feel selects (highlights) the entered text. So, when you press another key, it replaces the previous one. So, the solution is not to highlight the entered texts. You can achieve this by adding any one of the following statements in your keylistener.

正如您所提到的，当用户在组合框中输入任何文本时，Windows Look & Feel 会选择（突出显示）输入的文本。因此，当您按下另一个键时，它会替换上一个键。因此，解决方案不是突出显示输入的文本。您可以通过在密钥侦听器中添加以下任一语句来实现此目的。

textfield.setCaretPosition(textfield.getText().length());

OR

或者

textfield.setSelectionStart(textfield.getText().length());

So, your keylistener should look like this :

因此，您的密钥侦听器应如下所示：

final JTextField textfield = (JTextField) this.getEditor().getEditorComponent();
    textfield.addKeyListener(new KeyAdapter() {
        public void keyReleased(KeyEvent ke) {
            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    comboFilter(textfield.getText());
                    textfield.setCaretPosition(textfield.getText().length());
                }
            });
        }
    });