如何在不修改编辑器的情况下在JComboBox上使用addItem（）？

Question

I'm trying to use an editable JComboBox such that upon a user typing into the editor, possible results are displayed in the list part of the combo box.

Unfortunately, I've found that upon using either addItem(item) or getModel().addItem(item) , the input typed by the user is overwritten by the first value I added. I've considered storing the editor value, adding items, and then using setSelectedItem() to fix this, but I wan't to preserve the state of any selected text/ caret position, and believe this should be something more trivial, but can't for the life of me figure it out.

JComboBox box = new JComboBox();
box.setModel(new MutableComboBoxModel());
box.setEditable(true);
box.getEditor().getEditorComponent().addKeyListener(new KeyListener() {
  public void keyPressed(KeyEvent e) {

  }

  public void keyReleased(KeyEvent e) {
  }

  public void keyTyped(KeyEvent e) {
    // Actual results are retrieved from server via HTTP
    box.addItem("Demo");
    // Here, the editor window the user was typing in is replaced with the value "Demo".. how to fix this?
  }
});

Answer 1

• use AutoComplete JComboBox / JTextField ,

• for listening in JTextComponent is there DocumentListener ,

• never use KeyListener for Swing JComponents , this listener is designated for AWT Components , for Swing JComponents is there KeyBindings

Answer 2

您需要实现自己的MutableComboBoxModel，因为DefaultComboBoxModel负责“添加项目然后自动选择它”行为。