GridBagLayout占多行效果注意

 

 如果想要出现按钮2占两行的效果，必须按键3、按钮4同时存在且同时可见。

• 如果缺少按钮4，则按钮2不会占两行；
• 如果缺少按钮3、4，则按钮2也不会占两行。

 

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package com.wst.bj;

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

import javax.swing.JButton;
import javax.swing.JFrame;

class GridBagText {
     
    JFrame jframe = new JFrame("搜索");

    JButton jButton = new JButton("按钮1");
    JButton jButton2 = new JButton("按钮2");
    JButton jButton3 = new JButton("按钮3");
    JButton jButton4 = new JButton("按钮4");

    public GridBagText() {

        init();
    }
    
    private void init()
    {
        FrameUtil.initFram(jframe, 500, 700);
        
        GridBagLayout gridBagLayout = new GridBagLayout();
        jframe.setLayout(gridBagLayout);
        GridBagConstraints constraints = new  GridBagConstraints();
        
        constraints.fill = GridBagConstraints.BOTH;
        constraints.weightx = 1.0;
        constraints.weighty = 1.0;
        
        
        constraints.gridheight = 1;
        constraints.gridwidth = GridBagConstraints.REMAINDER;
        gridBagLayout.setConstraints(jButton, constraints);
        jframe.add(jButton);
        
        constraints.gridheight = 2;
        constraints.gridwidth = 1;
        gridBagLayout.setConstraints(jButton2, constraints);
        jframe.add(jButton2);

        constraints.gridheight = 1;
        constraints.gridwidth = GridBagConstraints.REMAINDER;
        gridBagLayout.setConstraints(jButton3, constraints);
        jframe.add(jButton3);
        gridBagLayout.setConstraints(jButton4, constraints);
        jframe.add(jButton4);
        

        jframe.setSize(jframe.getPreferredSize());
        jframe.setVisible(true);
//        jframe.pack();
    }
}

 

 

---

 

  

package com.wst.bj;

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

import javax.swing.JButton;
import javax.swing.JFrame;

class GridBagText {
     
    JFrame jframe = new JFrame("搜索");

    JButton jButton = new JButton("按钮1");
    JButton jButton2 = new JButton("按钮2");
    JButton jButton3 = new JButton("按钮3");
//    JButton jButton4 = new JButton("按钮4");

    public GridBagText() {

        init();
    }
    
    private void init()
    {
        FrameUtil.initFram(jframe, 500, 700);
        
        GridBagLayout gridBagLayout = new GridBagLayout();
        jframe.setLayout(gridBagLayout);
        GridBagConstraints constraints = new  GridBagConstraints();
        
        constraints.fill = GridBagConstraints.BOTH;
        constraints.weightx = 1.0;
        constraints.weighty = 1.0;
        
        
        constraints.gridheight = 1;
        constraints.gridwidth = GridBagConstraints.REMAINDER;
        gridBagLayout.setConstraints(jButton, constraints);
        jframe.add(jButton);
        
        constraints.gridheight = 2;
        constraints.gridwidth = 1;
        gridBagLayout.setConstraints(jButton2, constraints);
        jframe.add(jButton2);

        constraints.gridheight = 1;
        constraints.gridwidth = GridBagConstraints.REMAINDER;
        gridBagLayout.setConstraints(jButton3, constraints);
        jframe.add(jButton3);
//        gridBagLayout.setConstraints(jButton4, constraints);
//        jframe.add(jButton4);
        

        jframe.setSize(jframe.getPreferredSize());
        jframe.setVisible(true);
//        jframe.pack();
    }
}

 

 

---

 

package com.wst.bj;

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

import javax.swing.JButton;
import javax.swing.JFrame;

class GridBagText {
     
    JFrame jframe = new JFrame("搜索");

    JButton jButton = new JButton("按钮1");
    JButton jButton2 = new JButton("按钮2");
//    JButton jButton3 = new JButton("按钮3");
//    JButton jButton4 = new JButton("按钮4");

    public GridBagText() {

        init();
    }
    
    private void init()
    {
        FrameUtil.initFram(jframe, 500, 700);
        
        GridBagLayout gridBagLayout = new GridBagLayout();
        jframe.setLayout(gridBagLayout);
        GridBagConstraints constraints = new  GridBagConstraints();
        
        constraints.fill = GridBagConstraints.BOTH;
        constraints.weightx = 1.0;
        constraints.weighty = 1.0;
        
        
        constraints.gridheight = 1;
        constraints.gridwidth = GridBagConstraints.REMAINDER;
        gridBagLayout.setConstraints(jButton, constraints);
        jframe.add(jButton);
        
        constraints.gridheight = 2;
        constraints.gridwidth = 1;
        gridBagLayout.setConstraints(jButton2, constraints);
        jframe.add(jButton2);

//        constraints.gridheight = 2;
//        constraints.gridwidth = GridBagConstraints.REMAINDER;
//        gridBagLayout.setConstraints(jButton3, constraints);
//        jframe.add(jButton3);
//        gridBagLayout.setConstraints(jButton4, constraints);
//        jframe.add(jButton4);
        

        jframe.setSize(jframe.getPreferredSize());
        jframe.setVisible(true);
//        jframe.pack();
    }
}