我正在编写一个 Eclipse RCP,我想询问用户是否在应用程序关闭时备份数据库。从"file">“退出”菜单执行此操作很容易,因为我定义了一个命令退出:
public class ExitCommand extends AbstractHandler implements IHandler {
@Override
public Object execute(ExecutionEvent event) throws ExecutionException {
final IWorkbench workbench = PlatformUI.getWorkbench();
if (workbench == null)
return null;
// Ask whether the user wants to back up the information
Shell shell = new Shell(workbench.getDisplay());
MessageBox messageBox = new MessageBox(shell, SWT.ICON_QUESTION
| SWT.YES | SWT.NO);
messageBox.setMessage("You are leaving CatSysPD. Do you want to make a backup of the DataBase? (recommended)");
messageBox.setText("On Exit Backup");
int response = messageBox.open();
if (response == SWT.YES){
new BackupDataBaseAction(shell);
}
final Display display = workbench.getDisplay();
display.syncExec(new Runnable() {
public void run() {
if (!display.isDisposed())
workbench.close();
}
});
return null;
}}
然后我将它链接到一个名为 Exit 的菜单条目,并且这个工作正常。然而,用户也可以通过按下“关闭窗口”按钮来关闭应用程序。有什么办法可以捕捉到这个事件吗?
我在上一个主题 ( see here ) 中找到了使用 shutdownHook 的建议。然而,我想要执行的线程必须打开一个对话框,据我所知,这不能由外部线程完成。
谢谢!
编辑 我在此处添加我正在使用的 shutdownHook 的代码。在应用程序类中: 公共(public)类 Application 实现 IApplication {
final double NIDAQmxPortingVersionDependency = 1.001;
public final static String PLUGIN_ID = "CatsysPD";
private static Logger logger = Logger.getLogger(Application.class
.toString());
/*
* (non-Javadoc)
*
* @see org.eclipse.equinox.app.IApplication#start(org.eclipse.equinox.app.
* IApplicationContext)
*/
public Object start(IApplicationContext context) {
logger.info("Starting the application");
Display display = PlatformUI.createDisplay();
systemCheck(display);
initializeApplication(display);
try {
int returnCode = PlatformUI.createAndRunWorkbench(display,
new ApplicationWorkbenchAdvisor());
if (returnCode == PlatformUI.RETURN_RESTART) {
return IApplication.EXIT_RESTART;
}
BackupOnExitHook backupOnExitHook = new BackupOnExitHook(PlatformUI.getWorkbench().getDisplay());
Runtime.getRuntime().addShutdownHook(backupOnExitHook);
return IApplication.EXIT_OK;
} finally {
display.dispose();
}
}
private void systemCheck(Display display) {...}
public void stop() {...}
public void initializeApplication(Display display) {...}
private class BackupOnExitHook extends Thread {
private Display display;
public BackupOnExitHook(Display display){
this.display = display;
}
@Override
public void run(){
display.syncExec(new Runnable(){
@Override
public void run() {
MessageBox messageBox = new MessageBox(new Shell(display), SWT.ICON_QUESTION
| SWT.YES | SWT.NO);
messageBox.setMessage("You are leaving CatSysPD. Do you want to make a backup of the DataBase? (recommended)");
messageBox.setText("On Exit Backup");
int response = messageBox.open();
if (response == SWT.YES){
new BackupDataBaseAction(new Shell(display));
}
}});
}
}
}
我尝试运行它时遇到的错误是:
Exception in thread "Thread-5" org.eclipse.swt.SWTException: Device is disposed
at org.eclipse.swt.SWT.error(SWT.java:4083)
at org.eclipse.swt.SWT.error(SWT.java:3998)
at org.eclipse.swt.SWT.error(SWT.java:3969)
at org.eclipse.swt.widgets.Display.error(Display.java:1249)
at org.eclipse.swt.widgets.Display.syncExec(Display.java:4581)
at dk.catsys.pd.Application$BackupOnExitHook.run(Application.java:128)
再次感谢。
最佳答案
WorkbenchWIndowAdvisor 的 preWindowShellClose 怎么样?
关于java - 处理 Java RCP 应用程序中工作台窗口的关闭,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7658927/