试图在 JFrame 中显示 2 个 JPanel

Question

我的目标是在日历下方创建一个方形框，当我在程序进行中单击日期时，我可以在其中显示事件。首先，我需要创建那个盒子。这是我当前的代码：

package calendar;
import javax.swing.JFrame; 
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;


public class CalendarView extends JFrame  {
    DefaultTableModel table;
    Calendar cal = new GregorianCalendar();
    JLabel label;
    JLabel eventsLabel;
    

    CalendarView() {
        this.setTitle("Sai's Calendar :}");
        this.setSize(400, 400); 
        this.setResizable(false);
        this.setLayout(new BorderLayout());
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


        label = new JLabel("Sais Calendar :)");
        eventsLabel = new JLabel("EVENTS");
        
        //label.setHorizontalAlignment(SwingConstants.CENTER);
        
        JButton create = new JButton("CREATE");
        create.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
                 
            }
        });
        
        JButton quit = new JButton("QUIT");
        create.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
                 
            }
        });
        
        

        //making prev & next buttons 
        JButton prev = new JButton("<<");
        prev.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
                cal.add(Calendar.MONTH, -1);
                monthUpdate(); 
            }
        });


        JButton next = new JButton(">>"); 
        next.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
                cal.add(Calendar.MONTH, +1);
                monthUpdate(); 
            }
        });
        
        JPanel root = new JPanel(new BorderLayout());

        JPanel panel = new JPanel();
        panel.setLayout(new BorderLayout());
        panel.add(prev,BorderLayout.WEST);
        panel.add(label,BorderLayout.SOUTH);
        panel.add(next,BorderLayout.EAST);
        panel.add(create,BorderLayout.NORTH);
        panel.add(quit,BorderLayout.CENTER);
        
        
        JPanel events = new JPanel();
        events.setLayout(new BorderLayout());
        events.setBackground(Color.red);
        events.setPreferredSize(getPreferredSize());
        
        
        
        String[] days = {"Sun", "Mon", "Tue", "Wed", "Thurs", "Fri", "Sat"}; 
        table = new DefaultTableModel(null, days);
        JTable caltable = new JTable(table);
        caltable.setCellSelectionEnabled(true);
        caltable.getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

        // listen for cell selections using mouse listener to listen for clicks
        caltable.addMouseListener(new MouseListener() {
            public void mousePressed(MouseEvent e) {
                int row = caltable.getSelectedRow();
                int column = caltable.getSelectedColumn();

                //going to have to this to get stuff done on this date on calendar metohod 
                Object data = table.getValueAt(row, column);
            }
            public void mouseClicked(MouseEvent e) { }
            public void mouseReleased(MouseEvent e) { }
            public void mouseEntered(MouseEvent e) { }
            public void mouseExited(MouseEvent e) { }
        });
        JScrollPane pane = new JScrollPane(caltable);

        this.add(panel,BorderLayout.NORTH);
        this.add(pane,BorderLayout.CENTER);
        this.add(events,BorderLayout.SOUTH);

        this.monthUpdate();


    }

    protected void monthUpdate() {
        cal.set(Calendar.DAY_OF_MONTH, 1);
        String month = cal.getDisplayName(Calendar.MONTH, Calendar.LONG, Locale.US);
        int year = cal.get(Calendar.YEAR);
        label.setText(month + " " + year);

        int firstDay = cal.get(Calendar.DAY_OF_WEEK);
        int daysInMonth = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
        int weeksInMonth = cal.getActualMaximum(Calendar.WEEK_OF_MONTH);

        table.setRowCount(0);
        table.setRowCount(weeksInMonth);

        int x = firstDay - 1;

        for(int i=1;i <=daysInMonth; i++){
            table.setValueAt(i, x/7 , x%7 );    
            x = x + 1;
        }

    }


}

这是我当前的输出：

如您所见，事件面板是底部的一个小矩形，我希望它是一个比日历右侧更可取的正方形，但底部也可以。

谁能帮我弄清楚如何实现这个

Answer 1

我想说您的代码的问题是您的日历占用了太多空间。您的日历将只占用 5 行。

您应该让“红色”面板变大以填充额外的空间。因此它应该是添加到边框布局的“CENTER”的面板。

所以你需要创建另一个“包装”面板：

this.add(panel,BorderLayout.NORTH);
//this.add(pane,BorderLayout.CENTER);
JPanel wrapper = new JPanel( new BorderLayout() );
this.add(wrapper, BorderLayout.CENTER);
wrapper.add(pane, BorderLayout.PAGE_START);
//this.add(events,BorderLayout.SOUTH);
wrapper.add(events, BorderLayout.CENTER);

this.monthUpdate();
table.setPreferredScrollableViewportSize(table.getPreferredSize());

最后一条语句将允许滚动窗格自行调整大小以完全显示表格而无需额外空间。