Swing SpringLayout类

SpringLayout类根据一组约束定位其关联容器的子节点。

类声明

以下是javax.swing.SpringLayout类的声明 -

public class SpringLayout
   extends Object
      implements LayoutManager2

字段

以下是javax.swing.SpringLayout类的字段 -

• static String BASELINE - 指定组件的基线。
• static String EAST - 指定组件边界矩形的右边缘。
• static String HEIGHT - 指定组件边界矩形的高度。
• static String HORIZONTAL_CENTER - 指定组件边界矩形的水平中心。
• static String NORTH - 指定组件边界矩形的上边缘。
• static String SOUTH - 指定组件边界矩形的下边缘。
• static String VERTICAL_CENTER - 指定组件边界矩形的垂直中心。
• static String WEST - 指定组件边界矩形的左边缘。
• static String WIDTH - 指定组件边界矩形的宽度。

类构造函数

类方法

方法继承

该类继承以下类中的方法 -

• java.lang.Object

SpringLayout示例

使用编辑器创建以下Java程序：SpringLayoutDemo.java

package com.zaixian.layout;

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

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

    public SpringLayoutDemo() {
        prepareGUI();
    }

    public static void main(String[] args) {
        SpringLayoutDemo swingLayoutDemo = new SpringLayoutDemo();
        swingLayoutDemo.showSpringLayoutDemo();
    }

    private void prepareGUI() {
        mainFrame = new JFrame("Java SWING SpringLayoutDemo(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 showSpringLayoutDemo() {
        headerLabel.setText("Layout in action: SpringLayout");
        SpringLayout layout = new SpringLayout();

        JPanel panel = new JPanel();
        panel.setLayout(layout);
        JLabel label = new JLabel("输入姓名: ");
        JTextField textField = new JTextField("", 15);
        panel.add(label);
        panel.add(textField);

        layout.putConstraint(SpringLayout.WEST, label, 5, SpringLayout.WEST, controlPanel);
        layout.putConstraint(SpringLayout.NORTH, label, 5, SpringLayout.NORTH, controlPanel);
        layout.putConstraint(SpringLayout.WEST, textField, 5, SpringLayout.EAST, label);
        layout.putConstraint(SpringLayout.NORTH, textField, 5, SpringLayout.NORTH, controlPanel);

        layout.putConstraint(SpringLayout.EAST, panel, 5, SpringLayout.EAST, textField);
        layout.putConstraint(SpringLayout.SOUTH, panel, 5, SpringLayout.SOUTH, textField);
        controlPanel.add(panel);
        mainFrame.setVisible(true);
    }
}

执行上面示例代码，得到以下结果：