java - 如何在 Java 中禁用 GUI 按钮

Question

所以我的 GUI 有这么一小段代码:

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.BoxLayout;
import javax.swing.JSeparator;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;


public class IPGUI extends JFrame implements ActionListener 
{
    private static JPanel contentPane;
    private static boolean btn1Clicked = false;
    private static boolean btn2Clicked = false;
    private static boolean btn3Clicked = false;
    private static boolean btn4Clicked = false;

    //Create the frame
    public IPGUI() 
    {
        //Sets frame properties
        setTitle("IP Extractor");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 250, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);

        //Creates new JPanel with boxlayout
        JPanel panel = new JPanel();
        contentPane.add(panel, BorderLayout.CENTER);
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));

        //////////////////New Button//////////////////

        JButton btnConvertDocuments = new JButton("1. Convert Documents");
        btnConvertDocuments.setAlignmentX(Component.CENTER_ALIGNMENT);
        btnConvertDocuments.setMaximumSize(new Dimension(160, 0));
        btnConvertDocuments.setPreferredSize(new Dimension(0, 50));

        panel.add(btnConvertDocuments);

        btnConvertDocuments.setActionCommand("w");
        btnConvertDocuments.addActionListener((ActionListener) this);

        if (btn1Clicked == true)
        {
            btnConvertDocuments.setEnabled(false);
        }

        JSeparator separator_3 = new JSeparator();
        panel.add(separator_3);

        //////////////////New Button//////////////////

        JButton btnExtractImages = new JButton("2. Extract Images");
        btnExtractImages.setAlignmentX(Component.CENTER_ALIGNMENT);
        btnExtractImages.setMaximumSize(new Dimension(160, 0));
        btnExtractImages.setPreferredSize(new Dimension(0, 50));

        panel.add(btnExtractImages);

        btnExtractImages.setActionCommand("x");
        btnExtractImages.addActionListener((ActionListener) this);

         if (btn2Clicked == true)
         {
             btnExtractImages.setEnabled(false);
         }

        JSeparator separator_2 = new JSeparator();
        panel.add(separator_2);

        //////////////////New Button//////////////////

        JButton btnParseRIDValues = new JButton("3. Parse rId Values");
        btnParseRIDValues.setAlignmentX(Component.CENTER_ALIGNMENT);
        btnParseRIDValues.setMaximumSize(new Dimension(160, 0));
        btnParseRIDValues.setPreferredSize(new Dimension(0, 50));

        panel.add(btnParseRIDValues);

        btnParseRIDValues.setActionCommand("y");
        btnParseRIDValues.addActionListener((ActionListener) this);

        if (btn3Clicked == true)
        {
            btnParseRIDValues.setEnabled(false);
        }

        JSeparator separator_1 = new JSeparator();
        panel.add(separator_1);

        //////////////////New Button//////////////////

        JButton btnParseImageInfo = new JButton("4. Parse Image Info.");
        btnParseImageInfo.setAlignmentX(Component.CENTER_ALIGNMENT);
        btnParseImageInfo.setMaximumSize(new Dimension(160, 0));
        btnParseImageInfo.setPreferredSize(new Dimension(0, 50));

        panel.add(btnParseImageInfo);

        btnParseImageInfo.setActionCommand("z");
        btnParseImageInfo.addActionListener((ActionListener) this);

        if (btn4Clicked == true)
        {
            btnParseImageInfo.setEnabled(false);
        }
    }

    public void actionPerformed(ActionEvent event) 
    {
        String command = event.getActionCommand();

        if (command.equals("w"))
        {
            FileConverter fc = new FileConverter();
            btn1Clicked = true;
        }
        else if (command.equals("x"))
        {
            ImageExtractor ie = new ImageExtractor();
            btn2Clicked = true;
        }
        else if (command.equals("y")) 
        {
            XMLIDParser xip = new XMLIDParser();
            btn3Clicked = true;
        }
        else if (command.equals("z")) 
        {
            XMLTagParser xtp = new XMLTagParser();
            btn4Clicked = true;
        }
    }    
}

我想特别关注的部分是有条件的:

 if (btn1Clicked == true)
        {
            btnConvertDocuments.setEnabled(false);
        }

所以我相信该命令应该做的是:单击按钮并调用执行操作的方法后，btnClicked 应该设置为 true，因此该按钮应该被禁用。

有人能解释一下我这里哪里出错了，或者我的想法是否正确？预先感谢您的任何意见!

Answer 1

您应该将语句 btnConvertDocuments.setEnabled(false); 放在 actionPerformed(ActionEvent event) 方法中。当实例化 IPGUI 对象时，上面的条件仅在构造函数中调用一次。

if (command.equals("w")) {
    FileConverter fc = new FileConverter();
    btn1Clicked = true;
    btnConvertDocuments.setEnabled(false);
}