package org.trinet.util.graphics.task;
import javax.swing.*;
import javax.swing.SwingUtilities;
class Example2 extends Example1 {
Example2() {
super("Example 2");
}
/**
* Popup a modal confirm dialog and block until the user responds.
* Return true unless the user selects "NO".
*/
boolean waitForUserConfirmation() throws InterruptedException {
/* We're going to show the modal dialog on the event dispatching
* thread with SwingUtilities.invokeLater(), so we create a
* Runnable class that shows the dialog and stores the user's
* response.
*/
class DoShowDialog implements Runnable {
boolean proceedConfirmed;
public void run() {
Object[] options = {"Continue", "Cancel"};
int n = JOptionPane.showOptionDialog(Example2.this,
"Example2: Continue?",
"Example2",
JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE,
null,
options,
"Continue");
proceedConfirmed = (n == JOptionPane.YES_OPTION);
}
}
DoShowDialog doShowDialog = new DoShowDialog();
/* The invokeAndWait utility can throw an InterruptedException,
* which we don't bother with, and an InvocationException.
* The latter occurs if our Runnable throws - which would indicate
* a bug in DoShowDialog. The invokeAndWait() call will not return
* until the user has dismissed the modal confirm dialog.
*/
try {
SwingUtilities.invokeAndWait(doShowDialog);
}
catch (java.lang.reflect.InvocationTargetException e) {
e.printStackTrace();
}
return doShowDialog.proceedConfirmed;
}
/**
* This is just a copy of Example1.doWork() with one extra wrinkle.
* After about two seconds we ask the user to confirm with
* a modal dialog (see waitForUserConfirmation()); if the answer
* is NO then we short circuit.
*/
Object doWork() {
try {
for(int i = 0; i < NUMLOOPS; i++) {
updateStatus(i);
if (i == 4) {
if (!waitForUserConfirmation()) {
updateStatus(0);
return "Not Confirmed";
}
}
if (Thread.interrupted()) {
throw new InterruptedException();
}
Thread.sleep(500);
}
}
catch (InterruptedException e) {
updateStatus(0);
return "Interrupted"; // SwingWorker.get() returns this
}
return "All Done"; // or this
}
}
