Question

首先，我的程序非常简单。我只需要点击或按Alt + Enter JButton来递增计数器。

这是程序，所以你可以试试：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class holdDownClass implements ActionListener {
    private static JButton exebouton;
    private JTextArea ecran = new JTextArea();
    private JScrollPane scrollecran = new JScrollPane(ecran);
    private int counter = 0;

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

    private holdDownClass() {
        // Window
        JFrame frame = new JFrame("Name");
        frame.setBounds(400, 350, 625, 355);
        frame.setLayout(null);

        Container container = frame.getContentPane();

        // Panel
        JPanel panneau = new JPanel();
        panneau.setLayout(null);
        panneau.setBounds(2, 42, 146, 252);
        frame.add(panneau);

        JLabel nglabel = new JLabel("Click or Press Alt+Enter");
        nglabel.setBounds(5, 0, 200, 20);
        panneau.add(nglabel);

        // Button
        exebouton = new JButton("Execute");
        exebouton.setMnemonic(KeyEvent.VK_ENTER); // Shortcut: Alt + Enter
        exebouton.setBounds(4, 18, 138, 47);
        exebouton.addActionListener(this);
        panneau.add(exebouton);

        // Text Area
        ecran.setEditable(true);
        scrollecran.setBounds(150, 42, 467, 252);
        container.add(scrollecran);

        // Show
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        Object test = e.getSource();         
        if (test.equals(exebouton)) {
            counter += 1;
            ecran.setText(ecran.getText() + counter + "\n");
        }
    }
}

我的目标是：不要重复按Alt + Enter，我想按住Alt + Enter来增加计数器“更快”。

Answer 1

你可以使用MouseListener，但是，就个人而言，我觉得这不是实现你想要达到的目标的最合适的方法，因为它与按钮的工作方式相抗衡。

相反，您可以将更改侦听器附加到按钮模型，并且当按钮的状态保持按下时，循环Swing Timer ....

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class TestButton04 {

    public static void main(String[] args) {
        new TestButton04();
    }

    private int counter = 0;
    private Timer trigger;
    private JButton btn;

    public TestButton04() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                btn = new JButton("0");
                trigger = new Timer(125, new ActionListener() {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                        counter++;
                        btn.setText(String.valueOf(counter));
                    }
                });
                trigger.setCoalesce(true);
                trigger.setRepeats(true);

                btn.getModel().addChangeListener(new ChangeListener() {
                    @Override
                    public void stateChanged(ChangeEvent e) {
                        if (btn.getModel().isPressed()) {
                            trigger.start();
                        } else {
                            trigger.stop();
                        }
                    }
                });

                JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(btn);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }

        });
    }
}

Answer 2

这是你可以做到的方式 -

private boolean mousePressed;

鼠标听众 -

     exebouton.addMouseListener(new MouseAdapter() {
        public void mousePressed(MouseEvent e) {
            mousePressed = true;
            new Thread() {
                public void run() {
                    while (mousePressed) {
                        counter += 1;
                        ecran.setText(ecran.getText() + counter + "\n");
                    }
                }

            }.start();
        }

        public void mouseReleased(MouseEvent e) {
            mousePressed = false;
        }

    });

就是这样。

如何在按住按钮时执行JButton？

2 个答案: