java - setUndecorated(true) 到从 JOptionPane 实例创建的 JDialog

Question

我目前有一个 JDialog，它是通过从我的 JOptionPane 实例调用 createDialog() 方法创建的:

JOptionPane pane = new JOptionPane(myPanel, JOptionPane.PLAIN_MESSAGE,JOptionPane.DEFAULT_OPTION, null, new Object[]{}, null);
dialog = pane.createDialog(null, "");

我希望能够通过调用 JDialog 上的 setUndecorated(true) 从 JDialog 中删除标题栏，但是我得到了当我尝试运行我的程序时出现 IllegalComponentStateException: The dialog is displayable 异常。

据我所知，在我调用 dialog.show() 之前，对话框没有显示，这让我相信通过 实例化对话框时，对话框确实是“可显示的” code>pane.createDialog() 远远超出了我对 JDialog API 的理解。

我试图在使用 setUndecorated(true) 之前调用 setVisible(false)，但无济于事。

对于如何或完全有可能删除此类 JDialog 的标题栏的任何帮助，我们将不胜感激。从普通的 JDialog 中删除标题栏很容易，从许多其他此类问题的答案中可以看出，但我似乎无法让它为 JDialog 工作通过 createDialog() 创建。

相关代码:

            input= new JTextField(50);

        input.addKeyListener(new ConsoleKeyListener());


        input.addAncestorListener( new RequestFocusListener() );
        field = new JTextArea();
        field.setEditable(false);
        field.setLineWrap(true);
        JScrollPane area = new JScrollPane(field, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
        field.setRows(10);
        field.setText(consoleText);
        JPanel myPanel = new JPanel();

        myPanel.setLayout(new BorderLayout(0,0));
        myPanel.add(input, BorderLayout.PAGE_END);
        myPanel.add(area, BorderLayout.PAGE_START);
        input.setFocusable(true);
        input.requestFocus();
        int result = 101;
        //int result = JOptionPane.showOptionDialog(null, myPanel,"", JOptionPane.DEFAULT_OPTION,JOptionPane.PLAIN_MESSAGE, null, new Object[]{}, null);
        JOptionPane pane = new JOptionPane(myPanel, JOptionPane.PLAIN_MESSAGE, JOptionPane.DEFAULT_OPTION, null, new Object[]{}, null);

        dialog = pane.createDialog(null, "");
        dialog.setVisible(false);
        dialog.setUndecorated(true);
        //dialog.undecorated = true;


        //dialog.setOpacity(0.55f);
        removeMinMaxClose(dialog);
        removeMinMaxClose(pane); 
        removeMinMaxClose(myPanel);
        dialog.getRootPane().setOpaque(false);

        //JDialog dialog = new JDialog();
        //dialog.setVisible(false);
        //dialog.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
        //myPanel.setUndecorated(true);
        //dialog.setUndecorated(true);
        //dialog.getRootPane().setWindowDecorationStyle(JRootPane.PLAIN_DIALOG);  
        //dialog.setBounds( 100, 100, 300, 200 );  
        dialog.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent we) {
                System.out.println("yo");
            }
        });
        dialog.setVisible(true);
        dialog.show();

Answer 1

您需要阅读 JavaDoc entry on Component#isDisplayable , 然后看看创建对话框的源代码

"A component is made displayable either when it is added to a displayable containment hierarchy or when its containment hierarchy is made displayable. A containment hierarchy is made displayable when its ancestor window is either packed or made visible."

基本上，对话框被打包为 createDialog 方法的一部分

可能的解决方案

一个可能的解决方案是创建您自己的对话框...

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Frame;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestOptionPane11 {

    public static void main(String[] args) {
        new TestOptionPane11();
    }

    public TestOptionPane11() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                final JDialog dialog = new JDialog((Frame)null, "Boo");

                JOptionPane op = new JOptionPane("Look ma, no hands", JOptionPane.INFORMATION_MESSAGE, JOptionPane.OK_CANCEL_OPTION);
                op.addPropertyChangeListener(new PropertyChangeListener() {
                    @Override
                    public void propertyChange(PropertyChangeEvent evt) {
                        String name = evt.getPropertyName();
                        if ("value".equals(name)) {

                            dialog.dispose();

                        }
                    }
                });

                dialog.setUndecorated(true);
                dialog.setLayout(new BorderLayout());
                dialog.add(op);
                dialog.pack();
                dialog.setLocationRelativeTo(null);
                dialog.setVisible(true);
            }
        });
    }

}