java - 单击两次时自定义 JComboBox 未关闭

Question

正如标题所示，我正在创建一个自定义的JComboBox，并且当我编写popup.hide()时，自定义的BasicComboPopup不会隐藏；另外，如果你们知道制作 JComboBox 的更简单方法，该方法在主组件中显示缩写值，但在弹出窗口中显示未缩写的内容，我洗耳恭听。这是我的代码:

     import javax.swing.JComboBox;
     import java.awt.event.MouseEvent;
     import java.awt.event.MouseAdapter;
     import javax.swing.JFrame;
     import java.awt.GridBagLayout;
     import java.awt.Component;
     import java.awt.Container;
     import javax.swing.JButton;
     import java.awt.event.ActionListener;
     import java.awt.event.ActionEvent;
     import javax.swing.JPopupMenu;
     import javax.swing.plaf.basic.BasicComboPopup;

     class ChangingCombos extends JFrame
     {
        String[] abbrStr = new String[]{"--","TF","FF","SP"};
        String[] longStr = new String[]{"-Select One-","Thermo Film","Fashion Film","Specialty"};
        AbbreviatedComboBox<String> box = new AbbreviatedComboBox<String>(longStr,abbrStr);

        public ChangingCombos()
        {
           setLayout(new GridBagLayout());
           add(box);
           setDefaultCloseOperation(EXIT_ON_CLOSE);
           setLocation(300,300);
           pack();
           setVisible(true);
        }

        public static void main(String[]args)
        {
           new ChangingCombos();
        }

        class AbbreviatedComboBox<E> extends JComboBox<E>
        {
           E[] items = null;
           E[] abbreviations = null;
           BasicComboPopup popup = null;
           JComboBox self = this;
           JComboBox<E> abstractBox;

           public AbbreviatedComboBox(E[] items, E[] abbreviations)
           {
              super(abbreviations);
              this.items = items;
              this.abbreviations = abbreviations;
              abstractBox = new JComboBox<E>(items);
              popup = new BasicComboPopup(abstractBox);
              addCustomMouseListener(this);
              for(Component c: GUIUtilities.getAllSubcomponentsOf(this))addCustomMouseListener(c);

           }

           private void addCustomMouseListener(Component c)
           {
              c.addMouseListener(new MouseAdapter()
              {
                 public void mousePressed(MouseEvent e)
                 {
                    System.out.println("ohp");
                    if(!popup.isVisible())
                    {
                       popup.show(self,0,self.getHeight());
                    }
                    else popup.hide();
                 }
              });
           }
        }
     }

...另外，为了解释 GUIUtilities，它是另一个自定义类，并且方法 getAllSubcomponentsOf(Container c) 递归地返回所述容器中包含的所有组件。这是我访问 JComboBox 上的小箭头按钮的快捷方法。向同一个对象添加多个监听器似乎会产生问题，但它只迭代一次操作，正如仅使用 System.out.println("ohp") 验证的那样每次点击打印一次。

编辑:setVisible(false) 不起作用。我指的隐藏方法是ComboPopup.hide()；它并没有被弃用。当我执行 abstractBox.hidePopup() 时，它不会执行任何操作，因为 abstractBox 没有显示在屏幕上，而且从未打算这样做。只是它的弹出窗口。继续努力。

Answer 1

a simpler way of making a JComboBox that shows abbreviated values in the main component, but the un-abbreviated content in the popup

您将自定义对象存储在包含两个属性的 ComboBoxModel 中:

1. 值 - 用于在程序中进行处理
2. 描述 - 用于在组合框中显示

然后您可以使用组合框的自定义渲染器来显示描述值。

查看ComboBox With Custom Renderer了解此方法的更多信息和代码示例。

您还可以查看Combo Box Prompt它允许您提示输入值，而无需在 ComboBoxModel 中存储项目。您需要将此解决方案合并到上面示例中的渲染器中。

编辑:

也许我误解了你的要求。下面是一个简单的示例，其呈现下拉列表的方式与组合框中的显示方式不同:

import java.awt.*;
import javax.swing.*;
import javax.swing.plaf.basic.*;

public class ComboBoxRenderer extends JPanel
{
    public ComboBoxRenderer()
    {
        String[] items = { "Red", "Green", "Blue" };
        JComboBox<String> comboBox = new JComboBox<String>( items );
        comboBox.setSelectedIndex(-1);
        comboBox.setPrototypeDisplayValue( "Select Color" );
        comboBox.setRenderer( new MyRenderer() );

        add(comboBox, BorderLayout.NORTH );
    }

    class MyRenderer extends BasicComboBoxRenderer
    {
        public Component getListCellRendererComponent(
            JList list, Object value, int index, boolean isSelected, boolean cellHasFocus)
        {
            super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);

            if (value == null)
                value = "Select Color";

            if (index == -1 && value != null)
            {
                setText(value.toString());
            }
            else
                setText(index + " : " + value);

            return this;
        }
    }

    private static void createAndShowGUI()
    {

        JFrame frame = new JFrame("SSCCE");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new ComboBoxRenderer());
        frame.setLocationByPlatform( true );
        frame.pack();
        frame.setVisible( true );
    }

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