Swing GroupLayout類

GroupLayout類對組件進行分層分組，以便將它們放置在容器中。

類聲明

以下是javax.swing.GroupLayout類的聲明 -

public class GroupLayout
   extends Object
      implements LayoutManager2

字段

以下是javax.swing.GroupLayout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

GroupLayout示例

使用編輯器創建以下Java程式：GroupLayoutDemo.java

package com.zaixian.layout;


import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

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

   public GroupLayoutDemo(){
      prepareGUI();
   }
   public static void main(String[] args){
       GroupLayoutDemo swingLayoutDemo = new GroupLayoutDemo();
      swingLayoutDemo.showGroupLayoutDemo();
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java SWING GroupLayoutDemo(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 showGroupLayoutDemo(){
      headerLabel.setText("Layout in action: GroupLayout");
      JPanel panel = new JPanel();

      // panel.setBackground(Color.darkGray);
      panel.setSize(200,200);
      GroupLayout layout = new GroupLayout(panel);
      layout.setAutoCreateGaps(true);
      layout.setAutoCreateContainerGaps(true);

      JButton btn1 = new JButton("Button - A");
      JButton btn2 = new JButton("Button - B");
      JButton btn3 = new JButton("Button - C");

      layout.setHorizontalGroup(layout.createSequentialGroup()
         .addComponent(btn1)
         .addGroup(layout.createSequentialGroup()
         .addGroup(layout.createParallelGroup(
         GroupLayout.Alignment.LEADING)
         .addComponent(btn2)
         .addComponent(btn3))));

      layout.setVerticalGroup(layout.createSequentialGroup()
         .addComponent(btn1)
         .addComponent(btn2)
         .addComponent(btn3));

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

執行上面示例代碼，得到以下結果：