避免JOptionPane干扰动作侦听器

时间:2016-10-09 16:15:32

标签: java swing jbutton actionlistener joptionpane

我注意到所有JOptionPane方法"干扰"与ActionListeners。 在打开JOptionPane之后,我需要ActionListener保持活动状态。

例如:

我有一个JButton,我注册了鼠标,然后按下红色按钮。被释放后,我把它画成蓝色。

  • 如果我只是点击,按钮将变为蓝色。 确定
  • 如果我按住点击,该按钮将保持红色。 确定
  • 如果我点击并将其设置为打开一个JOptionPane对话框,即使我已经释放了鼠标,它也会保持红色。 不好

我还没有找到关于这种特定行为的任何文件,有人能指出我正确的方向吗?

我确实需要使用JOptionPane

1 个答案:

答案 0 :(得分:4)

一个选项 - 对调用进行排队以打开Swing事件队列上的JOptionPane。这将稍微延迟模态JOptionPane的打开,允许执行其他按钮操作。

另一个选择是从JOptionPane中提取JDialog,并以非模态方式调用它。

例如:

import java.awt.Color;
import java.awt.Component;
import java.awt.Dialog.ModalityType;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class TestOptionPane extends JPanel {
    private static final Color FOREGROUND = Color.RED;
    private static final Color PRESSED_FG = Color.BLUE;
    private JButton button1 = new JButton(new Button1Action());
    private JButton button2 = new JButton(new Button1Action());

    public TestOptionPane() {
        setPreferredSize(new Dimension(600, 450));
        button1.getModel().addChangeListener(new ButtonModelListener(button1));
        button1.setForeground(FOREGROUND);
        add(button1);
        button2.getModel().addChangeListener(new ButtonModelListener(button2));
        button2.setForeground(FOREGROUND);
        add(button2);
    }

    private class Button1Action extends AbstractAction {
        public Button1Action() {
            super("Queue JOptionPane on Swing event thread");
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            SwingUtilities.invokeLater(() -> {
                JOptionPane.showMessageDialog(TestOptionPane.this, "hello");
            });
        }
    }

    private class Button2Action extends AbstractAction {
        public Button2Action() {
            super("Show non-modal JOptionPane");
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            SwingUtilities.invokeLater(() -> {
                Component parentComponent = TestOptionPane.this;
                JOptionPane optionPane = new JOptionPane("Hello", JOptionPane.PLAIN_MESSAGE);
                JDialog dialog = optionPane.createDialog(parentComponent, "Fubars Rule!");
                dialog.setModalityType(ModalityType.MODELESS);
                dialog.setLocationRelativeTo(parentComponent);
                dialog.setVisible(true);
            });
        }
    }

    private class ButtonModelListener implements ChangeListener {
        private JButton button;

        public ButtonModelListener(JButton button) {
            this.button = button;
        }

        @Override
        public void stateChanged(ChangeEvent e) {
            ButtonModel model = (ButtonModel) e.getSource();
            if (model.isPressed()) {
                button.setForeground(PRESSED_FG);
            } else {
                button.setForeground(FOREGROUND);
            }
        }

    }

    private static void createAndShowGui() {
        JFrame frame = new JFrame("TestOptionPane");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(new TestOptionPane());
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> createAndShowGui());
    }
}