在Combobox中的编辑器组件中设置文本

Question

我的目标是创建一个过滤的组合框。

我创建了一个可编辑的组合框。当用户输入文本时，代码搜索模型中的匹配项。当用户离开组合框时，代码从列表中选择所选项。此外，编辑器组件中的文本获取所选项的值。

当焦点通过shift + tab返回组合框时，编辑器组件将获取所选元素的文本。释放shift键后，keylistener运行。在这种情况下，编辑器组件包含先前输入的文本，例如，焦点丢失时设置的值。

如何设置editorComponent的文本以使其保持不变？

以下是代码：

package de.ccw.reports.gui.incomingOrder.MyComboBox;

import java.awt.FlowLayout;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.ComboBoxModel;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JTextField;
import javax.swing.plaf.basic.BasicComboPopup;
import javax.swing.text.JTextComponent;

import de.ccw.commons.ui.comp.XComboBox;

public class FilterableComboBox<E> extends XComboBox<E> {

    ComboBoxModel<E> originalModel;
    DefaultComboBoxModel<E> filteredModel;

    JTextComponent editorComp;
    JList<E> list;

    public FilterableComboBox(ComboBoxModel<E> aModel) {
        super();
        receivePopupList();
        originalModel = aModel;

        filteredModel = new DefaultComboBoxModel<>();
        setModel(filteredModel);

        editorComp = (JTextComponent) getEditor().getEditorComponent();
        editorComp.addFocusListener(new FocusAdapter() {

            @Override
            public void focusLost(FocusEvent e) {
                System.out.println("focusLostStart=" + getSelectedItem() + "|" + editorComp.getText());

                String text = editorComp.getText();
                editorComp.setText("");
                setSelectedItem(null);

                if(list.getSelectedIndex() != -1 && text.isEmpty() == false){
                    setSelectedIndex(list.getSelectedIndex());
                    editorComp.setText(getSelectedItem().toString());
                }

                System.out.println("focusLostEnd=" + getSelectedItem() + "|" + editorComp.getText());
            }

            @Override
            public void focusGained(FocusEvent e) {
                System.out.println("focusGainedStart=" + getSelectedItem() + "|" + editorComp.getText());
                E element = getSelectedItem();
                String text = editorComp.getText();
                performModelFilter(null);
                showPopup();
                setSelectedItem(element);
                editorComp.setText(text);
                editorComp.selectAll();
                System.out.println("focusGainedEnd=" + getSelectedItem() + "|" + editorComp.getText());
            }

        });
        editorComp.addKeyListener(new KeyAdapter() {

            @Override
            public void keyTyped(KeyEvent e) {
            }

            String filterBkp = "";
            @Override
            public void keyReleased(KeyEvent e) {
                String filter = editorComp.getText();

                System.out.println("keyReleased-" + filterBkp + filter);

                if(filter.equals(filterBkp) == false)
                    refreshModel();

                filterBkp = filter;
            }

            @Override
            public void keyPressed(KeyEvent e) {
            }
        });

        setEditable(true);
    }

    @SuppressWarnings("unchecked")
    private void receivePopupList() {
        BasicComboPopup popup = (BasicComboPopup) getAccessibleContext().getAccessibleChild(0);
        list = popup.getList();
    }


    private void refreshModel() {

        String filter = editorComp.getText();

        performModelFilter(filter);

        editorComp.setText(filter);

    }

    private void performModelFilter(String filter) {
        System.out.println("performModelFilter-" + filter);

        filteredModel.removeAllElements();

        for(int i = 0; i < originalModel.getSize(); i++){
            E element = originalModel.getElementAt(i);
            String value = element.toString().toUpperCase();
            if (filter == null || value.contains(filter.toUpperCase())) {
                filteredModel.addElement(element);
            }
        }
    }

    public static void main(String args[]){
        FilterableComboBox<String> combo = new FilterableComboBox<>(new DefaultComboBoxModel<>(new String[]{"abc", "def", "ghi", "jkl", "mnoabc", "pqrdef"}));

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new FlowLayout());
        frame.add(new JTextField(20));
        frame.add(combo);
        frame.add(new JTextField(20));
        frame.pack();
        frame.setVisible(true);
    }

}