java - 根据父框架 Swing JDialog 大小

Question

我正在创建一个对话框并将其大小设置为

setSize(m_appview.getSize());

其中 m_appview 是对话框将出现在上方的 JFrame。这个 JFrame 包含一个 JButton，当按下它时将显示对话框。现在，当我最大化框架并单击按钮时，对话框将打开，其宽度与框架的宽度相匹配，但高度小于 JFrame 的高度。

怎么办？

Answer 1

例如

或

来自代码

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;

public class JFrameAndJDialog {

    private JFrame frame = new JFrame("PopupFactory Sample");
    private JDialog dialog = new JDialog();
    private JButton start1 = new JButton("Pick Me for Popup");
    private JButton start2 = new JButton("Close this Popup");
    private Point pnt = null;
    private Dimension dim = null;

    public JFrameAndJDialog() {
        start2.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                dialog.setVisible(false);
            }
        });
        dialog.add(start2, BorderLayout.SOUTH);
        dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
        dialog.setUndecorated(true);
        dialog.setVisible(false);
        start1.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                dim = frame.getSize();
                pnt = frame.getLocationOnScreen();
                int x = dim.width - 8;
                int y = dim.height - 8;
                dialog.setSize(x, y);
                x = pnt.x + 4;
                y = pnt.y + 4;
                dialog.setLocation(x, y);
                visibleForJDialog();
            }
        });
        frame.add(start1, BorderLayout.SOUTH);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocation(150, 150);
        frame.setSize(300, 300);
        frame.setVisible(true);
    }

    private void visibleForJDialog() {
        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                dialog.setVisible(true);
            }
        });
    }

    public static void main(final String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                JFrameAndJDialog uPF = new JFrameAndJDialog();
            }
        });
    }
}