SWT TEXT基本事件实例

我会带着你远行 2022-07-15 08:08 140阅读 0赞

import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; public class TestText \{ public static void main(String\[\] args) \{ Display display = new Display(); final Shell shell = new Shell(display); shell.setLayout(new GridLayout(1, false)); // 创建Label，设定提示信息 Label label = new Label(shell, SWT.WRAP); label.setText("Input your zip code/n" + "Note,only digit or letter is valid!"); // 创建可编辑Text final Text text = new Text(shell, SWT.BORDER); // 创建不可编辑Text组件，用于输出提示信息 final Text hintText = new Text(shell, SWT.READ\_ONLY); hintText.setLayoutData(new GridData(GridData.FILL\_HORIZONTAL)); // 为text组件加入文本修改事件监听器 text.addModifyListener(new ModifyListener() \{ public void modifyText(ModifyEvent e) \{ String string = text.getText(); int index = 0; // 遍历文本内容，检查是否为字母或数字 while (index < string.length()) \{ char ch = string.charAt(index); if (!Character.isLetterOrDigit(ch)) break; index++; \} // 若text中输入不合法，则输出错误提示信息 if (index != string.length()) \{ hintText.setText("invalid input"); \} else \{ hintText.setText(""); \} \} \}); // 创建Label组件，设定密码提示信息 Label label2 = new Label(shell, SWT.WRAP); label2.setText("password length no shorter than 6,/n" + "and no longer than 8"); // 创建密码Text组件 final Text pwdText = new Text(shell, SWT.BORDER | SWT.PASSWORD); // 用户输入不得长于8个字符 pwdText.setTextLimit(8); // 为pwdText组件加入文本修改事件监听器 pwdText.addListener(SWT.Modify, new Listener() \{ public void handleEvent(Event event) \{ if (pwdText.getText().length() < 6) \{ hintText.setText("password not safe"); \} else \{ hintText.setText("password perfect"); \} \} \}); shell.pack(); shell.open(); while (!shell.isDisposed()) \{ if (!display.readAndDispatch()) display.sleep(); \} display.dispose(); \} \}