javax.swing.ComboBoxEditor#getEditorComponent ( )源码实例Demo

@Override
protected ComboBoxEditor createEditor() {
	ComboBoxEditor comboBoxEditor = super.createEditor();

	Component editor = comboBoxEditor.getEditorComponent();
	if( editor instanceof JTextField ) {
		JTextField textField = (JTextField) editor;
		textField.setColumns( editorColumns );

		// assign a non-null and non-javax.swing.plaf.UIResource border to the text field,
		// otherwise it is replaced with default text field border when switching LaF
		// because javax.swing.plaf.basic.BasicComboBoxEditor.BorderlessTextField.setBorder()
		// uses "border instanceof javax.swing.plaf.basic.BasicComboBoxEditor.UIResource"
		// instead of "border instanceof javax.swing.plaf.UIResource"
		textField.setBorder( BorderFactory.createEmptyBorder() );
	}

	return comboBoxEditor;
}
 

/**
 * Initializes the ComboBoxInput variable
 *
 * @param ignored not used
 */
private void initComboBoxEditor(Object... ignored) {
	ComboBoxEditor editor = comboBox.getEditor();
	if (editor == null) {
		return;
	}
	if (editor.getEditorComponent() instanceof JTextComponent) {
		if (comboBoxInput != null) {
			//Clear old listener
			comboBoxInput.getDocument().removeDocumentListener(this);
			comboBoxInput.removeFocusListener(focusChangeListener);
			comboBoxInput.removeKeyListener(updateOnEnterKey);
		}
		comboBoxInput = ((JTextComponent) editor.getEditorComponent());
		comboBoxInput.getDocument().addDocumentListener(this);
		// workaround for java bug #6433257
		comboBoxInput.addFocusListener(focusChangeListener);
		// allow enter to use current value
		comboBoxInput.addKeyListener(updateOnEnterKey);
	}
}
 

@SuppressWarnings("unchecked")
private JPanel createInputPanel()
{
    JPanel outerPanel = new JPanel(new BorderLayout());
    JPanel innerPanel = new JPanel(new BorderLayout());
    m_comboBox = new JComboBox(getHistory().toArray());
    StringBuilder prototype = new StringBuilder(70);
    for (int i = 0; i < 40; ++i)
        prototype.append('-');
    m_comboBox.setPrototypeDisplayValue(prototype.toString());
    m_comboBox.setEditable(true);
    ComboBoxEditor editor = m_comboBox.getEditor();
    m_comboBox.addActionListener(this);
    m_textField = (JTextField)editor.getEditorComponent();
    m_textField.selectAll();
    KeyListener keyListener = new KeyAdapter()
        {
            public void keyPressed(KeyEvent e)
            {
                int c = e.getKeyCode();
                if (c == KeyEvent.VK_ESCAPE
                    && ! m_comboBox.isPopupVisible())
                    dispose();
            }
        };
    m_textField.addKeyListener(keyListener);
    GuiUtil.setMonospacedFont(m_comboBox);
    innerPanel.add(m_comboBox, BorderLayout.CENTER);
    outerPanel.add(innerPanel, BorderLayout.NORTH);
    return outerPanel;
}
 

public static boolean install( JComboBox combo ) {
    boolean res = false;
    ComboBoxEditor comboEditor = combo.getEditor();
    if( comboEditor.getEditorComponent() instanceof JTextComponent ) {
        JTextComponent textEditor = ( JTextComponent ) comboEditor.getEditorComponent();
        Document doc = textEditor.getDocument();
        doc.addDocumentListener( new AutoCompleteListener( combo ) );
        setIgnoreSelectionEvents( combo, false );
        combo.setEditable( true );
        res = true;
    }
    combo.putClientProperty( "nb.combo.autocomplete", res ); //NOI18N
    return res;
}
 

public static boolean install( JComboBox combo ) {
    boolean res = false;
    ComboBoxEditor comboEditor = combo.getEditor();
    if( comboEditor.getEditorComponent() instanceof JTextComponent ) {
        JTextComponent textEditor = ( JTextComponent ) comboEditor.getEditorComponent();
        Document doc = textEditor.getDocument();
        doc.addDocumentListener( new AutoCompleteListener( combo ) );
        setIgnoreSelectionEvents( combo, false );
        combo.setEditable( true );
        res = true;
    }
    combo.putClientProperty( "nb.combo.autocomplete", res ); //NOI18N
    return res;
}
 

public AutoCompletionComboBoxEditor(ComboBoxEditor editor) {
	if ((editor.getEditorComponent() instanceof JTextField)) {
		this.editor = editor;
		editorComponent = (JTextField) editor.getEditorComponent();
		editorComponent.getDocument().addDocumentListener(docListener);
		editorComponent.addKeyListener(new KeyAdapter() {

			@Override
			public void keyPressed(KeyEvent e) {
				if (e.getKeyCode() == KeyEvent.VK_ENTER) {
					setSelectedItem(editorComponent.getText());
					actionPerformed(new ActionEvent(this, 0, "editingStoped"));
					e.consume();
				} else if (e.getKeyCode() == KeyEvent.VK_TAB) {
					if (isPopupVisible()) {
						hidePopup();
					} else {
						showPopup();
					}
					e.consume();
				} else {
					super.keyPressed(e);
				}
			}
		});
	} else {
		throw new IllegalArgumentException("Only JTextField allowed as editor component");
	}
}
 

@Override
public void setEditor(ComboBoxEditor anEditor) {
	// check if editor component has changed at all: Otherwise listener already registered
	if (getEditor() == null || anEditor.getEditorComponent() != getEditor().getEditorComponent()) {
		super.setEditor(new AutoCompletionComboBoxEditor(anEditor));
	}
}
 

public void propertyChange(PropertyChangeEvent e) {
    if (e.getPropertyName().equals("editor")) {
        ComboBoxEditor editor = comboBox.getEditor();
        if (editor!=null && editor.getEditorComponent()!=null) {
            JComponent editorComponent = (JComponent) comboBox.getEditor().getEditorComponent();
            editorComponent.addKeyListener(this);
            editorComponent.setBorder(null);
        }
    }
}