Question

嘿伙计。当我按下按钮时，如何切换或更改GridBagLayout的所有JButton？好像卡住了。它不会取代旧的.....请帮助我...我尝试重绘（），重新验证（）但“叹气”它只是不起作用。请指正。

package gridlayoutjumper;

import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;


public class GridLayoutJumper extends JFrame implements ActionListener{
    JFrame timeTableFrame = new JFrame("Helo");  
    JPanel timeTablePnl = new JPanel(new GridBagLayout());
    GridBagConstraints c = new GridBagConstraints();
    JButton jb1 = new JButton("Jbutton1");
    JButton jb4 = new JButton("Change");
    JButton jb3 = new JButton("Jbutton3");
    JButton jb2 = new JButton("Jbutton2");

    public GridLayoutJumper(){

    }

    public void newLayout1(){

        System.out.println("newLayout1 executed");
        JButton jb5 = new JButton("Jbutton5");
        JButton jb6 = new JButton("Jbutton6");
        JButton jb7 = new JButton("Jbutton7");

        c.gridx = 0;
        c.gridy = 0;
        c.weightx = 1;
        c.weighty = 1;
        c.insets = new Insets(0, 15, 0, 15); 
        timeTablePnl.add(jb5, c);

        c.gridx = 1;
        c.gridy = 0;
        c.weightx = 1;
        c.weighty = 1;
        c.insets = new Insets(0, 15, 0, 15);  
        timeTablePnl.add(jb6, c);

        c.gridx = 0;
        c.gridy = 1;
        c.weightx = 1;
        c.weighty = 1;
        c.insets = new Insets(0, 15, 0, 15);  
        timeTablePnl.add(jb7, c);

        timeTablePnl.validate();
        timeTablePnl.repaint();
    }

    public void createComponent(){
        timeTableFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        timeTableFrame.setPreferredSize(new Dimension(500, 500));
        timeTableFrame.setMinimumSize(new Dimension(500, 500));
        timeTableFrame.add(timeTablePnl);

        c.gridx = 0;
        c.gridy = 0;
        c.weightx = 1;
        c.weighty = 1;
        c.insets = new Insets(0, 15, 0, 15);
        timeTablePnl.add(jb1, c);

        c.gridx = 1;
        c.gridy = 0;
        c.weightx = 1;
        c.weighty = 1;
        c.insets = new Insets(0, 15, 0, 15); 
        timeTablePnl.add(jb2, c);

        c.gridx = 0;
        c.gridy = 1;
        c.weightx = 1;
        c.weighty = 1;
        c.insets = new Insets(0, 15, 0, 15);  
        timeTablePnl.add(jb3, c);

        c.gridx = 1;
        c.gridy = 1;
        c.weightx = 1;
        c.weighty = 1;
        c.insets = new Insets(0, 15, 0, 15);  
        timeTablePnl.add(jb4, c);

        jb4.addActionListener(this); 
        timeTableFrame.setVisible(true);
    }


    @Override
    public void actionPerformed(ActionEvent e){
        Object source = e.getSource();
        if(source == jb4){
            System.out.println("Gotcha");
            newLayout1();
        }
    }

    public static void main(String[] args) {
        GridLayoutJumper x = new GridLayoutJumper();
        x.createComponent();
    }
}

Answer 1

首先尝试从容器中删除旧组件：

public void newLayout1() {

    timeTablePnl.remove(jb1);
    timeTablePnl.remove(jb2);
    timeTablePnl.remove(jb3);

    .
    .
    .
}

我认为GridBagLayout只是忽略了在同一网格坐标处插入的组件。

即时切换GridbagLayout

1 个答案: