How to run some task after application window is created and visible? - swt

Question

I have SWT application. I need to run some task (with progress bar) after application started and its window is visible. How/Where to do that ?
import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.action.StatusLineManager;
import org.eclipse.jface.action.ToolBarManager;
import org.eclipse.jface.window.ApplicationWindow;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class TestApp extends ApplicationWindow {
/**
* Create the application window.
*/
public TestApp() {
super(null);
createActions();
addToolBar(SWT.FLAT | SWT.WRAP);
addMenuBar();
addStatusLine();
}
/**
* Create contents of the application window.
* #param parent
*/
#Override
protected Control createContents(Composite parent) {
Composite container = new Composite(parent, SWT.NONE);
return container;
}
/**
* Create the actions.
*/
private void createActions() {
// Create the actions
}
/**
* Create the menu manager.
* #return the menu manager
*/
#Override
protected MenuManager createMenuManager() {
MenuManager menuManager = new MenuManager("menu");
return menuManager;
}
/**
* Create the toolbar manager.
* #return the toolbar manager
*/
#Override
protected ToolBarManager createToolBarManager(int style) {
ToolBarManager toolBarManager = new ToolBarManager(style);
return toolBarManager;
}
/**
* Create the status line manager.
* #return the status line manager
*/
#Override
protected StatusLineManager createStatusLineManager() {
StatusLineManager statusLineManager = new StatusLineManager();
return statusLineManager;
}
/**
* Launch the application.
* #param args
*/
public static void main(String args[]) {
try {
TestApp window = new TestApp();
window.setBlockOnOpen(true);
window.open();
Display.getCurrent().dispose();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Configure the shell.
* #param newShell
*/
#Override
protected void configureShell(Shell newShell) {
super.configureShell(newShell);
newShell.setText("New Application");
}
/**
* Return the initial size of the window.
*/
#Override
protected Point getInitialSize() {
return new Point(450, 300);
}
}

Answer 1

You could use a paint listener.
#Override
protected Control createContents(Composite parent) {
Composite container = new Composite(parent, SWT.NONE);
container.addPaintListener(new PaintListener() {
#Override
public void paintControl(PaintEvent e) {
System.out.println("I'm ready to go...");
}
});
return container;
}

Answer 2

Thanks to Tom for an idea of registering listener. I found something that works for me - ShellListener. Example below.
/**
* Create contents of the application window.
* #param parent
*/
#Override
protected Control createContents(Composite parent) {
Composite container = new Composite(parent, SWT.NONE);
// build gui...
getShell().addShellListener(new ShellAdapter() {
#Override
public void shellActivated(ShellEvent shellevent) {
// some task...
}
});
return container;
}