Handle the closing of the workbench window in Java RCP application
I'm writing an Eclipse RCP and I want to ask the user whether to backup the database when the application is closed. Doing it from the File>Exit menu was easy as I defined a command exit:
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;
}}
I then linked this to a menu entry called Exit and this work right. How开发者_JAVA技巧ever the user could close the application also by pressing the "close window" button. Is there any way of catching this event?
I found a suggestion in a previous topic (see here) using a shutdownHook. However the thread that I want execute has to open a dialog and, as I understand, this cannot be done by an external thread.
Thank you!
Edit I add here the code for the shutdownHook I'm using. In the Application class: public class Application implements 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));
}
}});
}
}
}
The error I get when I try to run it is:
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)
Thanks again.
How about preWindowShellClose from WorkbenchWIndowAdvisor?
http://help.eclipse.org/helios/topic/org.eclipse.platform.doc.isv/reference/api/org/eclipse/ui/application/WorkbenchWindowAdvisor.html
精彩评论