java中的jcombobox过滤器 - 外观独立

Question

我有一个简单的JComboBox过滤器代码：

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();
    }
}

组合过滤器的性能不是很好，但对于少数数据集来说它很好。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，组合框仅通过替换先前输入的字符来获取单个字符。

你可以告诉我发生了什么事吗？ Manoj Shrestha's answer below在某种程度上有所帮助，但是，您能否提供一些其他建议来实现Java中的组合框过滤器？

Answer 1

首先，您每次都在创建新模型，然后从代码调用show popup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，似乎具有其他人所指出的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);
    }
}

希望它适合你。

Answer 2

很长的答案，我认为关于不同的外观和感觉如何在API中实现方法并且有效的例子

• KeyListener不是Swing JComponents的正确监听器，你真的很想搞定KeyBindings，

• KeyListener是简单的异步，

• JComboBox是复合JComponent，然后需要覆盖内部JComponents，KeyListener的所有输出都必须包装到invokeLater（）中，注意我可以从coumpond JComponents创建两次invokeLater（）不返回预期输出的事件对于GUI，只有带Swing Action的Swing Timer可以正确地做到这一点，为什么要打扰这个关于错误方式的例子，这很简单，

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是复合JComponent，然后需要覆盖BasicComboBoxUI，请抱歉我懒得编写和模拟代码太长的代码作为第一点的代码

• 否则所有来自上述两点的努力都是无用的和反作用的，没有别的，只有DOT

---

请有人来测试* nix和apple OS X中的代码

来自我的Java6 WinXP组件（所有重要的内容都隐藏在使用过的方法中，对前Sun Microsystems的匿名作者来说是无比的荣誉）

物质L＆amp; F

WindowsLookAndFeel L＆amp; F

Nimbus L＆amp; F

金属L＆amp; F

来自Java Classes

主

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

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

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;
        }
    }
}

修改

Win7 64b / Java7的输出

金属L＆amp; F

Windows L＆amp; F（JComboBox中Button附近有趣的空白空间）

Nimbus L＆amp; F

随意编辑

Answer 3

此组件称为自动完成，并包含在所谓的swing扩展项中。

请看一下：http://swingx.java.net/
有一个webstart：http://swinglabs-demos.java.net/demos/swingxset6/swingxset.jnlp

自动填充是要选择的菜单。享受乐趣，减少错误代码：）

Answer 4

显然，故障是在使用的文本域组件中。所发生的情况是，当使用Windows外观时，使用“textfield.selectAll（）;”行选择此组件中的文本，因此当您键入任何其他内容时，将从textfield组件中清除所选文本。因此，在下面的代码中，调整了该组件的插入位置。这是它的工作原理，首先将文本字段的当前插入位置存储在变量“currentCaretPosition”中，然后将插入位置移动到组件中文本的开头。过滤后将插入位置恢复为“currentCaretPosition”变量值。我希望它能按你的意愿运作。

精炼代码如下： -

                                       /****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**********/

Answer 5

正如您所提到的，当用户在组合框中输入任何文本时，它看起来像是Windows外观和视频。感觉选择（突出显示）输入的文本。因此，当您按另一个键时，它将替换前一个键。因此，解决方案不是突出显示输入的文本。您可以通过在keylistener中添加以下任何一个语句来实现此目的。

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

OR

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

所以，你的keylistener应该是这样的：

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());
                }
            });
        }
    });