Java使用彈簧布局管理器

Java使用彈簧布局管理器：

1. package com.han;
3. import java.awt.Container;
4. import java.awt.event.WindowAdapter;
5. import java.awt.event.WindowEvent;
7. import javax.swing.JButton;
8. import javax.swing.JFrame;
9. import javax.swing.JLabel;
10. import javax.swing.JScrollPane;
11. import javax.swing.JTextArea;
12. import javax.swing.JTextField;
13. import javax.swing.Spring;
14. import javax.swing.SpringLayout;
16. /**
17. * 使用彈簧布局管理器
18. * @author HAN
19. *
20. */
21. public class SpringLayout_3 extends JFrame {
23. /**
24. *
25. */
26. private static final long serialVersionUID = -6045918631932051025L;
28. public SpringLayout_3() {
29. // TODO Auto-generated constructor stub
30. Container container = getContentPane();
31. SpringLayout springLayout = new SpringLayout();
32. container.setLayout(springLayout);
33. JLabel topicLabel = new JLabel("topic :");
34. JLabel contentLabel = new JLabel("content :");
35. final JTextField textField = new JTextField(30);
36. JTextArea textArea = new JTextArea(3, 30);
37. JScrollPane scrollPane = new JScrollPane();
38. scrollPane.setViewportView(textArea);
39. textArea.setLineWrap(true);
40. final JButton confirmButton = new JButton("confirm");
41. JButton cancelButton = new JButton("cancel");
42. Spring st = Spring.constant(10);
43. Spring st2 = Spring.constant(30);
44. container.add(topicLabel);
45. springLayout.putConstraint(SpringLayout.NORTH, topicLabel, st,
46. SpringLayout.NORTH, container);
47. springLayout.putConstraint(SpringLayout.WEST, topicLabel, st,
48. SpringLayout.WEST, container);
49. container.add(textField);
50. springLayout.putConstraint(SpringLayout.WEST, textField, st2,
51. SpringLayout.EAST, topicLabel);
52. springLayout.putConstraint(SpringLayout.NORTH, textField, 0,
53. SpringLayout.NORTH, topicLabel);
54. springLayout.putConstraint(SpringLayout.EAST, textField, Spring.minus(st),
55. SpringLayout.EAST, container);
56. container.add(contentLabel);
57. springLayout.putConstraint(SpringLayout.WEST, contentLabel, 0,
58. SpringLayout.WEST, topicLabel);
59. springLayout.putConstraint(SpringLayout.NORTH, contentLabel, st,
60. SpringLayout.SOUTH, topicLabel);
61. container.add(scrollPane);
62. springLayout.putConstraint(SpringLayout.NORTH, scrollPane, 0,
63. SpringLayout.NORTH, contentLabel);
64. springLayout.putConstraint(SpringLayout.WEST, scrollPane, 0,
65. SpringLayout.WEST, textField);
66. springLayout.putConstraint(SpringLayout.EAST, scrollPane, Spring.minus(st),
67. SpringLayout.EAST, container);
68. container.add(confirmButton);
69. springLayout.putConstraint(SpringLayout.SOUTH, scrollPane, Spring.minus(st),
70. SpringLayout.NORTH, confirmButton);
71. springLayout.putConstraint(SpringLayout.EAST, confirmButton, Spring.minus(st),
72. SpringLayout.EAST, container);
73. springLayout.putConstraint(SpringLayout.SOUTH, confirmButton, Spring.minus(st),
74. SpringLayout.SOUTH, container);
75. container.add(cancelButton);
76. springLayout.putConstraint(SpringLayout.EAST, cancelButton, Spring.minus(st),
77. SpringLayout.WEST, confirmButton);
78. springLayout.putConstraint(SpringLayout.NORTH, cancelButton, 0,
79. SpringLayout.NORTH, confirmButton);
81. // make the text field focused every time the window is activated
82. addWindowFocusListener(new WindowAdapter() {
84. @Override
85. public void windowGainedFocus(WindowEvent e) {
86. // TODO Auto-generated method stub
87. textField.requestFocus();
88. }
90. });
91. }
93. /**
94. * @param args
95. */
96. public static void main(String[] args) {
97. // TODO Auto-generated method stub
98. SpringLayout_3 frame = new SpringLayout_3();
99. frame.setTitle("使用彈簧布局管理器");
100. frame.setVisible(true);
101. frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
102. frame.setBounds(100, 100, 600, 300);
103. }
105. }