在调整大小时,gridbaglayout的组件是否可以填充父框架？

Question

我有一个用JFrameroot JPanel实例化的根GridBagLayout.在运行时,面板被填充有基于某些描述的部件,并且宽度,高度以及x,y COORDS中给出的描述中,以与被使用gridwidth,gridheight,gridx和gridy在字段GridBagConstraints.组件本身也可以JPanel是带有自己子组件的组件GridBagConstraints,GUI在树中描述,因此Frame是递归填充的.

我遇到的问题是,当调整框架大小时,内部组件不会被拉伸以填充其给定的宽度和高度.我已经给出了下面的布局代码示例,并附有截图.

import javax.swing.*;
import javax.swing.border.TitledBorder;
import java.awt.*;
import java.util.*;

public class GridBagTest extends JPanel {

    private final GridBagConstraints gbc = new GridBagConstraints();

    public GridBagTest(){

        setLayout(new GridBagLayout());
        add(gbcComponent(0,0,1,2), gbc);    
        add(gbcComponent(1,0,2,1), gbc);            
        add(gbcComponent(1,1,1,1), gbc);            
        add(gbcComponent(2,1,1,1), gbc);            

    }

    //Returns a JPanel with some component inside it, and sets the GBC fields
    private JPanel gbcComponent(int x, int y, int w, int h){

        gbc.gridx = x; 
        gbc.gridy = y;
        gbc.gridwidth = w;
        gbc.gridheight = h;
        gbc.fill = GridBagConstraints.BOTH;
        JPanel panel = new JPanel();
        JTextField text = new JTextField("(" + w + ", " + h + ")");
        panel.setBorder(new TitledBorder("(" + x + ", " + y + ")"));        
        panel.add(text);
        return panel;

    }

    public static void main (String args[]){

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(new GridBagTest());
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}

我需要它,所以在图2中,JPanel保持组件的内部尺寸被调整大小以填充它们各自的宽度和高度GridBagLayout,理想地也拉伸它们的组件.

Answer 1

这通常是由于您没有设置weightx和重量限制.

尝试:

gbc.gridx = x; 
gbc.gridy = y;
gbc.gridwidth = w;
gbc.gridheight = h;

// **** add here:
gbc.weightx = 1.0;
gbc.weighty = 1.0;

如果需要,这将允许您的GUI在x和y方向上扩展.