JComboBox的行为与JTextField不同.我怎么能看起来相似? [英] JComboBox does not behave same as JTextField. How can i have it look similar?

问题描述

我有这个下面的组合框，在其中可以创建带有项目等的组合框，但外观与JTextField不同.如何使JCombobox看起来像JTextField?

I have this following combo box, where i am able to create my combo box with items etc, but the look is not same as JTextField. How can i make JCombobox look same like JTextField?

MyComboBox.java:

MyComboBox.java:

import java.awt.Color;
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.plaf.basic.BasicComboBoxUI;

public class MyComboBox extends JComboBox {
  public MyComboBox(String[] name) {
    Border border = BorderFactory.createEmptyBorder(11, 11, 11, 11);
    JComboBox cb = new JComboBox(name);
    cb.setUI(new BasicComboBoxUI() {
        @Override
        protected JButton createArrowButton() {
            return new JButton() {
                    @Override
                    public int getWidth() {
                            return 0;
                    }
            };
        }
    });

    setModel(cb.getModel());    
    setOpaque(false);
    setBorder(new LineBorder(Color.black, 1, true));
    //setBackground(Color.white);
    setVisible(true); 


  }
//  public void paintComponent(Graphics g) {
//      super.paintComponent(g);                
//      g.setColor(new Color(red, green, blue) );
//      g.fillOval(125, 125, 50, 50);
//  }  
}

推荐答案

• 最好使用外观和感觉

  JComboBox有两种状态，JComboBox可以是Editable和Non_Editable(默认)

  JComboBox has two states, JComboBox can be Editable and Non_Editable (default)

  没有CustomUI(例如@aterai)，但对Look and Feel敏感，仅对Metal Look and Feel

  without CustomUI (as example by @aterai), but Look and Feel sensitive, only for Metal Look and Feel

  import java.awt.*;
  import java.util.Vector;
  import javax.swing.*;
  import javax.swing.UIManager;
  import javax.swing.plaf.ColorUIResource;
  import javax.swing.plaf.metal.MetalComboBoxButton;
  
  public class MyComboBox {
  
      private Vector<String> listSomeString = new Vector<String>();
      private JComboBox someComboBox = new JComboBox(listSomeString);
      private JComboBox editableComboBox = new JComboBox(listSomeString);
      private JComboBox non_EditableComboBox = new JComboBox(listSomeString);
      private JFrame frame;
  
      public MyComboBox() {
          listSomeString.add("-");
          listSomeString.add("Snowboarding");
          listSomeString.add("Rowing");
          listSomeString.add("Knitting");
          listSomeString.add("Speed reading");
  //
          someComboBox.setPrototypeDisplayValue("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
          someComboBox.setFont(new Font("Serif", Font.BOLD, 16));
          someComboBox.setEditable(true);
          someComboBox.getEditor().getEditorComponent().setBackground(Color.YELLOW);
          ((JTextField) someComboBox.getEditor().getEditorComponent()).setBackground(Color.YELLOW);
  //        
          editableComboBox.setPrototypeDisplayValue("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
          editableComboBox.setFont(new Font("Serif", Font.BOLD, 16));
          editableComboBox.setEditable(true);
          JTextField text = ((JTextField) editableComboBox.getEditor().getEditorComponent());
          text.setBackground(Color.YELLOW);
          JComboBox coloredArrowsCombo = editableComboBox;
          Component[] comp = coloredArrowsCombo.getComponents();
          for (int i = 0; i < comp.length; i++) {
              if (comp[i] instanceof MetalComboBoxButton) {
                  MetalComboBoxButton coloredArrowsButton = (MetalComboBoxButton) comp[i];
                  coloredArrowsButton.setBackground(null);
                  break;
              }
          }
  //        
          non_EditableComboBox.setPrototypeDisplayValue("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
          non_EditableComboBox.setFont(new Font("Serif", Font.BOLD, 16));
  //
          frame = new JFrame();
          frame.setLayout(new GridLayout(0, 1, 10, 10));
          frame.add(someComboBox);
          frame.add(editableComboBox);
          frame.add(non_EditableComboBox);
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setLocation(100, 100);
          frame.pack();
          frame.setVisible(true);
      }
  
      public static void main(String[] args) {
          UIManager.put("ComboBox.background", new ColorUIResource(Color.yellow));
          UIManager.put("JTextField.background", new ColorUIResource(Color.yellow));
          UIManager.put("ComboBox.selectionBackground", new ColorUIResource(Color.magenta));
          UIManager.put("ComboBox.selectionForeground", new ColorUIResource(Color.blue));
          SwingUtilities.invokeLater(new Runnable() {
  
              @Override
              public void run() {
                  MyComboBox aCTF = new MyComboBox();
              }
          });
      }
  }
  

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