GridBagLayout：网格包布局管理器

GridBagLayout：网格包布局管理器

 

GridBagLayout可以说是布局管理器Layout中最复杂的一个，其中涉及到的参数也比较得多，比如说：

GridBagConstraints gridBagConstraints=new GridBagConstraints(gridx,gridy,gridwidth,gridheight,weightx,weighty,anchor,fill,insets,ipadx,ipady);

 

具体的参数含义如下：

 

gridx,gridy:

用来设置组件的相对位置。

 

gridwidth,gridheight：

用来设置组件所占的单位长度与高度，默认值皆为1。

 

weightx,weighty:

用来设置窗口变大时各组件跟随变大的比例，当数字越大其表示的含义是组件能够得到更大的空间，默认值皆为0。

 

anchor:

当组件空间大于组件本身时，要将组建置于何处。

 

insets:

设置组件之间彼此的间距，它有四个参数，分别是上、左、下、右，默认值皆为0.

 

ipadx,ipady:

设置组件间距，默认值皆为0。

 

本文以在JPanel面板中添加三个JButton按钮为例来进行进一步的说明。

源代码：

package TestTwo;

import java.awt.*;

import javax.swing.*;

public class GridBagLayoutTest extends JFrame{

public GridBagLayoutTest(String title){

super(title);

initUI();

}

private void initUI(){

this.setBounds(100,100,350,200);

this.setVisible(true);

this.getContentPane().add(getPanelThree());

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

private JPanel getPanelOne(){

JPanel jpl1=new JPanel();

jpl1.setLayout(new GridBagLayout());

GridBagConstraints gb1=new GridBagConstraints();

JButton jb1=new JButton("按钮1");

gb1.insets=new Insets(15,15,15,15);

JButton jb2=new JButton("按钮2");

gb1.gridx=0;

gb1.gridy=0;

gb1.gridwidth=2;

gb1.gridheight=1;

gb1.fill=GridBagConstraints.BOTH;

jpl1.add(jb1,gb1);

gb1.gridx=0;

gb1.gridy=1;

jpl1.add(jb2,gb1);

jpl1.setBackground(Color.WHITE);

return jpl1;

}

private JPanel getPanelTwo(){

JPanel jpl2=new JPanel();

jpl2.setLayout(new GridBagLayout());

GridBagConstraints gb2=new GridBagConstraints();

JButton jb3=new JButton("按钮3");

gb2.gridx=0;

gb2.gridy=0;

gb2.gridwidth=2;

gb2.gridheight=2;

gb2.fill=GridBagConstraints.BOTH;

jpl2.add(jb3,gb2);

jpl2.setBackground(Color.WHITE);

return jpl2;

}

private JPanel getPanelThree(){

JPanel jpl3=new JPanel();

jpl3.setLayout(new GridBagLayout());

GridBagConstraints gb3=new GridBagConstraints();

gb3.gridx=0;

gb3.gridy=0;

gb3.weightx=2.0;

gb3.weighty=1.0;

gb3.fill=GridBagConstraints.BOTH;

jpl3.add(getPanelOne(),gb3);

gb3.gridx=1;

gb3.gridy=0;

gb3.weightx=3.0;

jpl3.add(getPanelTwo(),gb3);

return jpl3;

}

/**

 * @param args

 */

public static void main(String[] args) {

// TODO Auto-generated method stub

new GridBagLayoutTest("网格包布局管理器"); 

}

}

运行的结果：

 

方法二：

package TestTwo;

import java.awt.*;

import javax.swing.*;

public class GridBagLayoutTestTwo extends JFrame{

private JButton jb1,jb2,jb3;

public GridBagLayoutTestTwo(String title){

super(title);

initUI();

}

private void initUI(){

this.setBounds(100,100,350,200);

this.setVisible(true);

this.getContentPane().add(getPanelThree());

this.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);

}

private JPanel getPanelThree(){

JPanel jpl3=new JPanel();

jpl3.setLayout(new GridBagLayout());

GridBagConstraints gb3=new GridBagConstraints();

gb3.gridx=0;

gb3.gridy=0;

gb3.weightx=2.0;

gb3.weighty=1.0;

gb3.fill=GridBagConstraints.BOTH;

jpl3.add(getPanelOne(),gb3);

gb3.gridx=1;

gb3.gridy=0;

gb3.weightx=3.0;

jpl3.add(getPanelTwo(),gb3);

return jpl3;

}

private JPanel getPanelOne(){

JPanel jpl1=new JPanel();

GridBagLayout gridBagLayout=new GridBagLayout();

jpl1.setLayout(gridBagLayout);

gridBagLayout.setConstraints(getJButtonOne(),new GridBagConstraints(0,0,1,1,0,0,GridBagConstraints.SOUTH,GridBagConstraints.BOTH,new Insets(35,35,15,65),0,0));

jpl1.add(getJButtonOne());

gridBagLayout.setConstraints(getJButtonTwo(),new GridBagConstraints(0,1,1,1,0,0,GridBagConstraints.SOUTH,GridBagConstraints.BOTH,new Insets(15,35,35,65),0,0));

jpl1.add(getJButtonTwo());

jpl1.setBackground(Color.WHITE);

return jpl1;

}

private JButton getJButtonOne(){

if(jb1==null){

jb1=new JButton("按钮1");

}

return jb1;

}

private JButton getJButtonTwo(){

if(jb2==null){

jb2=new JButton("按钮2");

}

return jb2;

}

private JPanel getPanelTwo(){

JPanel jpl2=new JPanel();

GridBagLayout gridBagLayout=new GridBagLayout();

jpl2.setLayout(gridBagLayout);

gridBagLayout.setConstraints(getJButtonThree(),new GridBagConstraints(0,0,2,2,0,0,GridBagConstraints.SOUTH,GridBagConstraints.BOTH,new Insets(15,15,15,35),0,0));

jpl2.add(getJButtonThree());

jpl2.setBackground(Color.WHITE);

return jpl2;

}

private JButton getJButtonThree(){

if(jb3==null){

jb3=new JButton("按钮3");

}

return jb3;

}

/**

 * @param args

 */

public static void main(String[] args) {

// TODO Auto-generated method stub

new GridBagLayoutTestTwo("网格包布局管理器二");

}

}

运行的结果：