Swing GridBagLayout類

GridBagLayout類以水準和垂直方式排列組件。

類聲明

以下是java.awt.GridBagLayout類的聲明 -

public class GridBagLayout
   extends Object
      implements LayoutManager2, Serializable

字段

以下是java.awt.GridBagLayout類的字段 -

• static int DEFAULT_SIZE - 指示組件的大小或間隙應用於特定範圍值。
• static int PREFERRED_SIZE - 表示組件的首選大小或間隙應用於特定範圍值。

類構造函數

類方法

方法繼承

該類繼承以下類中的方法 -

－ java.lang.Object

GridBagLayout示例

使用編輯器創建以下Java程式：GridBagLayout.java

package com.zaixian.layout;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class GridBagLayoutDemo {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;
   private JLabel msglabel;

   public GridBagLayoutDemo(){
      prepareGUI();
   }
   public static void main(String[] args){
       GridBagLayoutDemo swingLayoutDemo = new GridBagLayoutDemo();
      swingLayoutDemo.showGridBagLayoutDemo();
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java SWING GridBagLayoutDemo(xuhuhu.com)");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));

      headerLabel = new JLabel("",JLabel.CENTER );
      statusLabel = new JLabel("",JLabel.CENTER);
      statusLabel.setSize(350,100);

      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }
      });
      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);
   }
   private void showGridBagLayoutDemo(){
      headerLabel.setText("Layout in action: GridBagLayout");

      JPanel panel = new JPanel();
      panel.setBackground(Color.darkGray);
      panel.setSize(300,300);
      GridBagLayout layout = new GridBagLayout();

      panel.setLayout(layout);
      GridBagConstraints gbc = new GridBagConstraints();

      gbc.fill = GridBagConstraints.HORIZONTAL;
      gbc.gridx = 0;
      gbc.gridy = 0;
      panel.add(new JButton("Button - A"),gbc);

      gbc.gridx = 1;
      gbc.gridy = 0;
      panel.add(new JButton("Button - B"),gbc);

      gbc.fill = GridBagConstraints.HORIZONTAL;
      gbc.ipady = 20;
      gbc.gridx = 0;
      gbc.gridy = 1;
      panel.add(new JButton("Button - C"),gbc);

      gbc.gridx = 1;
      gbc.gridy = 1;
      panel.add(new JButton("Button - D"),gbc);

      gbc.gridx = 0;
      gbc.gridy = 2;
      gbc.fill = GridBagConstraints.HORIZONTAL;
      gbc.gridwidth = 2;
      panel.add(new JButton("Button - E"),gbc);

      controlPanel.add(panel);
      mainFrame.setVisible(true);
   }
}

執行上面示例代碼，得到以下結果：