JTextField「Bubble」Text

Question

我想知道是否有可能在Swing中使用StackOverflow中的標籤進入系統（可能使用JTextField）。

Answer 1

你可以重新定義自己的類，它擴展了JTextField類，讓你想要的風格。

這個link可能有幫助，還有另外一個例子here。

編輯：

我創造你想要什麼一個小例子。這只是一個草案，可以改進，但你現在有一個起點。

public class MainPanel extends JPanel{ 

    public MainPanel() { 
     super(new BorderLayout()); 
     final JPanel p = new JPanel(new GridLayout(5,1,5,5)); 
     final JTextPane tp = new JTextPane(); 
     final StyledDocument doc = tp.getStyledDocument(); 
     final SimpleAttributeSet attr = new SimpleAttributeSet(); 
     JTextField textField01 = new JTextField(20) { 
      //Unleash Your Creativity with Swing and the Java 2D API! 
      //http://java.sun.com/products/jfc/tsc/articles/swing2d/index.html 
      @Override protected void paintComponent(Graphics g) { 
       if(!isOpaque()) { 
        int w = getWidth(); 
        int h = getHeight(); 
        Graphics2D g2 = (Graphics2D)g.create(); 
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); 
        g2.setColor(UIManager.getColor("TextField.background")); 
        g2.fillRoundRect(0, 0, w-1, h-1, h, h); 
        g2.setColor(Color.GRAY); 
        g2.drawRoundRect(0, 0, w-1, h-1, h, h); 
        g2.dispose(); 
       } 
       super.paintComponent(g); 
      } 
     }; 
     textField01.setOpaque(false); 
     textField01.setBackground(new Color(0,0,0,0)); 
     textField01.setBorder(BorderFactory.createEmptyBorder(4, 8, 4, 8)); 
     textField01.setText("Test"); 
     textField01.addKeyListener(new KeyAdapter() { 
      public void keyReleased(KeyEvent e) { 
      } 

      public void keyTyped(KeyEvent e) { 
       // TODO: Do something for the keyTyped event 
      } 

      public void keyPressed(KeyEvent e) { 
       // TODO: Do something for the keyPressed event 
       if(e.getKeyCode() == KeyEvent.VK_ENTER){ 
        JTextField textField = (JTextField) e.getSource(); 
        String text = textField.getText(); 
        textField.setText(""); 
        JLabel label = new JLabel(text); 
        label.setOpaque(true); 
        label.setBackground(Color.lightGray); 
        label.setBorder(BorderFactory.createLineBorder(Color.black,1)); 
        tp.setCaretPosition(tp.getDocument().getLength()); 
        tp.insertComponent(label); 
        try { 
         doc.insertString(doc.getLength(), " ", attr); 
        } 
        catch (BadLocationException ex){ 
         ex.printStackTrace(); 
        } 
       } 
      } 
     }); 
     p.add(textField01); 
     p.add(tp); 
     add(p); 
     setBorder(BorderFactory.createEmptyBorder(20,20,20,20)); 
     setPreferredSize(new Dimension(320, 200)); 
    } 

    public static void main(String[] args) { 
     EventQueue.invokeLater(new Runnable() { 
      @Override public void run() { 
       createAndShowGUI(); 
      } 
     }); 
    } 

    public static void createAndShowGUI() { 
     try{ 
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
     }catch(Exception e) { 
      e.printStackTrace(); 
     } 
     JFrame frame = new JFrame("Tags editor"); 
     frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 
     frame.getContentPane().add(new MainPanel()); 
     frame.pack(); 
     frame.setLocationRelativeTo(null); 
     frame.setVisible(true); 
    } 
} 

class RoundedCornerBorder extends AbstractBorder { 
    @Override public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) { 
     Graphics2D g2 = (Graphics2D)g.create(); 
     g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); 
     int r = height-1; 
     RoundRectangle2D round = new RoundRectangle2D.Float(x, y, width-1, height-1, r, r); 
     Container parent = c.getParent(); 
     if(parent!=null) { 
      g2.setColor(parent.getBackground()); 
      Area corner = new Area(new Rectangle2D.Float(x, y, width, height)); 
      corner.subtract(new Area(round)); 
      g2.fill(corner); 
     } 
     g2.setColor(Color.GRAY); 
     g2.draw(round); 
     g2.dispose(); 
    } 
    @Override public Insets getBorderInsets(Component c) { 
     return new Insets(4, 8, 4, 8); 
    } 
    @Override public Insets getBorderInsets(Component c, Insets insets) { 
     insets.left = insets.right = 8; 
     insets.top = insets.bottom = 4; 
     return insets; 
    } 
}