Java Swing GroupLayout

Java Swing教程 - Java Swing GroupLayout

GroupLayout在javax.swing包中。

GroupLayout使用组的概念。 一个组由元素组成。 组的元素可以是组件，间隙或另一组。

间隙是两个组件之间的不可见区域。

有两种类型的组:

• Sequential group
• Parallel group

当组中的元素被依次串联放置时，它被称为顺序组。

当组中的元素并行放置时，它被称为并行组。

GroupLayout类包含三个内部类:Group，SequentialGroup和ParallelGroup。

Group是一个抽象类，其他两个类继承自Group类。

我们可以使用GroupLayout类的工厂方法来创建它们的对象。

我们可以使用GroupLayout类的工厂方法来创建它们的对象。...

以下代码演示了如何使用GroupLayout在JFrame中并排显示两个按钮。

import java.awt.Container;
//  w  w w .  ja  v  a  2s.  c o  m
import javax.swing.GroupLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class Main {
  public static void main(String[] args) {
    JFrame frame = new JFrame("GroupLayout");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container contentPane = frame.getContentPane();

    GroupLayout groupLayout = new GroupLayout(contentPane);

    contentPane.setLayout(groupLayout);

    JLabel label = new JLabel("Label");
    JButton b2 = new JButton("Second Button");
    
    groupLayout.setHorizontalGroup(groupLayout.createSequentialGroup()
        .addComponent(label).addComponent(b2));

    groupLayout.setVerticalGroup(groupLayout
        .createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(label)
        .addComponent(b2));

    frame.pack();
    frame.setVisible(true);
  }
}

间隙

以下代码演示了如何使用GroupLayout在JFrame中并排显示两个按钮。...

import java.awt.Container;
//w  ww .j a  v a  2 s.c o m
import javax.swing.GroupLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class Main {
  public static void main(String[] args) {
    JFrame frame = new JFrame("GroupLayout");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container contentPane = frame.getContentPane();

    GroupLayout groupLayout = new GroupLayout(contentPane);

    contentPane.setLayout(groupLayout);

    JLabel label = new JLabel("Label");
    JButton b2 = new JButton("Second Button");
    
    groupLayout.setHorizontalGroup(groupLayout.createSequentialGroup()
        .addComponent(label).addGap(5, 10,   50).addComponent(b2));

    groupLayout.setVerticalGroup(groupLayout
        .createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(label)
        .addComponent(b2));

    frame.pack();
    frame.setVisible(true);
  }
}

例子

以下代码在b1和b2之间添加了RELATED首选间隙:

import java.awt.Container;
//w w w .java  2s. c  om
import javax.swing.GroupLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.LayoutStyle;

public class Main {
  public static void main(String[] args) {
    JFrame frame = new JFrame("GroupLayout");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container contentPane = frame.getContentPane();

    GroupLayout groupLayout = new GroupLayout(contentPane);

    contentPane.setLayout(groupLayout);

    JLabel label = new JLabel("Label");
    JButton b2 = new JButton("Second Button");
    
    groupLayout.setHorizontalGroup(groupLayout.createSequentialGroup()
        .addComponent(label).addPreferredGap(LayoutStyle.ComponentPlacement.RELATED).addComponent(b2));

    groupLayout.setVerticalGroup(groupLayout
        .createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(label)
        .addComponent(b2));

    frame.pack();
    frame.setVisible(true);
  }
}

实施例2

import static javax.swing.GroupLayout.Alignment.BASELINE;
import static javax.swing.GroupLayout.Alignment.LEADING;
import static javax.swing.GroupLayout.Alignment.TRAILING;
// ww  w .  j av a  2 s . c  o m
import java.awt.Container;

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

public class Main {
  public static void main(String[] args) {
    JFrame frame = new JFrame("GroupLayout");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container contentPane = frame.getContentPane();

    GroupLayout groupLayout =
     new GroupLayout(contentPane); groupLayout.setAutoCreateGaps(true);
     groupLayout.setAutoCreateContainerGaps(true);
     contentPane.setLayout(groupLayout);

    JButton b1 = new JButton("Button 1");
    JButton b2 = new JButton("Button Second");
    JButton b3 = new JButton("3");
    JButton b4 = new JButton("4");

    groupLayout.setHorizontalGroup(groupLayout
        .createSequentialGroup()
        .addGroup(
            groupLayout.createParallelGroup(LEADING).addComponent(b1)
                .addComponent(b3))
        .addGroup(
            groupLayout.createParallelGroup(TRAILING).addComponent(b2)
                .addComponent(b4)));

    groupLayout.setVerticalGroup(groupLayout
        .createSequentialGroup()
        .addGroup(
            groupLayout.createParallelGroup(BASELINE).addComponent(b1)
                .addComponent(b2))
        .addGroup(
            groupLayout.createParallelGroup(BASELINE).addComponent(b3)
                .addComponent(b4)));

    frame.pack();
    frame.setVisible(true);
  }
}