如何限制JDialog的尺寸

Question

private final Dimension SCREEN_DIMENSION = Toolkit.getDefaultToolkit().getScreenSize();

@Override
public Dimension getMaximumSize() {
    return new Dimension(SCREEN_DIMENSION.width / 2, SCREEN_DIMENSION.height / 2);
}

但是我尝试重写getminimumSize()、getPreferredSize()、getSize()等似乎都不起作用，或者可能是我实现错误。我需要调整它的内部子组件吗？或者仅仅调整JDialog/code>就足够了？如果是，怎么做？




Answer 1

我创建了一个简单的GUI来说明我的注释。这是JFrame。

这是JDialog。

下面是完整的示例代码。您必须修改createPendenciesPanel方法，使其更加真实。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;

public class JDialogTest implements Runnable {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new JDialogTest());
    }

    private JFrame frame;

    @Override
    public void run() {
        frame = new JFrame("JDialog Test");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.add(createMainPanel());

        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    private JPanel createMainPanel() {
        JPanel panel = new JPanel(new BorderLayout());
        panel.setBorder(BorderFactory.createEmptyBorder(
                150, 100, 150, 100));
        panel.setPreferredSize(new Dimension(400, 600));

        JButton button = new JButton("Open JDialog");
        button.addActionListener(new ButtonListener());
        panel.add(button);

        return panel;
    }

    public class ButtonListener implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            new PendenciesDialog(frame, "Pendencies Dialog");
        }

    }

    public class PendenciesDialog  extends JDialog {

        private static final long serialVersionUID = 1L;

        public PendenciesDialog(JFrame frame, String title) {
            super(frame, true);
            
            setDefaultCloseOperation(DISPOSE_ON_CLOSE);
            setTitle(title);

            add(createMainPanel(frame));
            pack();
            setLocationRelativeTo(frame);
            setVisible(true);
        }
        
        private JPanel createMainPanel(JFrame frame) {
            JPanel panel = new JPanel(new BorderLayout());
            
            JPanel displayPanel = createDisplayPanel();
            JScrollPane scrollPane = new JScrollPane(displayPanel);
            panel.add(scrollPane, BorderLayout.CENTER);
            
            Dimension d = frame.getSize();
            Dimension p = displayPanel.getPreferredSize();
            panel.setPreferredSize(new Dimension(p.width + 50, d.height / 2));
            
            return panel;
        }
        
        private JPanel createDisplayPanel() {
            JPanel panel = new JPanel(new GridLayout(0, 1, 10, 10));
            panel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
            
            for (int i = 0; i < 6; i++) {
                panel.add(createPendenciesPanel());
            }
            
            return panel;
        }
        
        private JPanel createPendenciesPanel() {
            JPanel panel = new JPanel(new FlowLayout());
            panel.setBackground(Color.LIGHT_GRAY);
            panel.setPreferredSize(new Dimension(100, 200));
            
            return panel;
        }

    }
    
}