一個仿 Eclipse 歡迎窗口的代碼 - FormLayout典型示例

一個仿 Eclipse 歡迎窗口的代碼，一個背景圖片，最下方是一個進度條，上面有一個label，顯示一些信息

技術點總結：

一、窗口居中

二、Form布局

三、SWT UI線程調度（本例實現了一個假的），注意到，只有UI線程才能操作UI的控件。

在別的Windows中 new WelcomeWindow().open()即可，此Windows執行完加載任務後會自動關閉。

1. /**
2. * Welcome Window
3. */
4. public class WelcomeWindow {
6. //private static Logger logger = LoggerFactory.getLogger(WelcomeWindow.class);
8. private Shell shell;
10. /**
11. * Open the window.
12. */
13. public void open() {
14. Display display = Display.getDefault();
15. createContents();
16. configureShell();
17. shell.open();
18. // shell.layout();
20. while (!shell.isDisposed()) {
21. if (!display.readAndDispatch()) {
22. display.sleep();
23. }
24. }
25. }
27. /**
28. * Configure shell
29. *
30. * @param shell
31. */
32. protected void configureShell() {
33. shell.pack();
35. Rectangle rctDisplay = shell.getDisplay().getBounds();
36. Rectangle rctShell = shell.getBounds();
37. int x = (rctDisplay.width - rctShell.width) / 2;
38. int y = (rctDisplay.height - rctShell.height) / 2;
39. shell.setLocation(x, y);
40. }
42. /**
43. * Create contents of the window.
44. */
45. protected void createContents() {
46. shell = new Shell(SWT.ON_TOP);
47. shell.setLayout(new FillLayout());
49. // Composite as container
50. Composite container = new Composite(shell, SWT.NONE);
51. FormLayout layout = new FormLayout();
52. container.setLayout(layout);
54. // ProgressBar
55. final ProgressBar bar = new ProgressBar(container, SWT.HORIZONTAL);
56. bar.setMinimum(0);
57. bar.setMaximum(100);
58. final int min = bar.getMinimum();
59. final int max = bar.getMaximum();
61. FormData formData = null;
62. formData = new FormData();
63. formData.left = new FormAttachment(0, 0);
64. formData.right = new FormAttachment(100, 0);
65. formData.bottom = new FormAttachment(100, 0);
66. bar.setLayoutData(formData);
68. // Label Message
69. final Label lblMessage = new Label(container, SWT.INHERIT_DEFAULT);
70. lblMessage.setBackground(shell.getDisplay().getSystemColor(SWT.COLOR_WHITE));
71. formData = new FormData();
72. formData.left = new FormAttachment(0, 0);
73. formData.right = new FormAttachment(60);
74. formData.bottom = new FormAttachment(bar, 0);
75. lblMessage.setLayoutData(formData);
77. // Label Image
78. Label lblImage = new Label(container, SWT.NONE);
79. lblImage.setImage(Registry.getImage("logo.bmp"));
80. formData = new FormData();
81. formData.left = new FormAttachment(0, 0);
82. formData.top = new FormAttachment(0, 0);
83. lblImage.setLayoutData(formData);
85. final int step = 5;
86. new Thread(new Runnable() {
87. public void run() {
88. shell.getDisplay().asyncExec(new Runnable() {
89. public void run() {
90. for (int i = min; i < max; i += step) {
91. if (bar.isDisposed()) {
92. return;
93. }
94. try {
95. Thread.sleep(100);
96. } catch (InterruptedException e) {
97. e.printStackTrace();
98. }
99. String text = GlobalVariable.getResourceBundle().getString("ww.bar.loading");
100. text = MessageFormat.format(text, bar.getSelection(), StringUtils.repeat('.', i / step));
101. lblMessage.setText(text);
102. bar.setSelection(bar.getSelection() + i);
103. }
104. shell.dispose();
105. }
106. });
107. }
108. }).start();
109. }
111. }