JOptionPane issue

[vladislav peichev]

I have an applet, which displays a drawing and allows user to measure area by drawing lines. When the last drawn line intersects another line I display a JOptionPane with warning message for self-intersection. After the user presses the OK button my applet does not regain the focus, so ESC key cannot be used also the wrong line cannot be removed. Tried requestFocus and requestFocusWindow without success. How to regain focus after JOptionPane is closed? Thanks in advance.

[Rob Spoor]

You'll probably need to use EventQueue.invokeLater / SwingUtilities.invokeLater, to make sure the focus event is processed correctly:

EventQueue.invokeLater(new Runnable()
{
public void run()
{
applet.requestFocus();
}
});

[vladislav peichev]

Using invokeLater does not help, the same issue still occurs. Any other suggestions?

[Darryl Burke]

To get better help sooner, post a SSCCE that clearly demonstrates your problem.

[vladislav peichev]

This is my function which displays JOptionPane with Warning message in case of self-intersection.

public void selfIntersection() {
NLanguage title = Enum.valueOf(NLanguage.class, "GC_IntersectTitle");
NLanguage intersect = Enum.valueOf(NLanguage.class, "GC_Intersection");
JOptionPane.showMessageDialog(this, intersect.getText(), title.getText(), JOptionPane.WARNING_MESSAGE);
try {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
requestFocus();
}
});
} catch (InterruptedException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
;
try {
Robot robot = new Robot();
Point2D lastPoint = m_objNDrawPanel.getPoints().lastElement();
lastPoint = m_graphicPanel.transformWorldToView(lastPoint);
Point2D screenLocation = getLocationOnScreen();
robot.mouseMove((int)(lastPoint.getX() + screenLocation.getX()), (int)(lastPoint.getY() + screenLocation
.getY()));
robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
} catch (Exception ex) {
ex.printStackTrace();
}
}

The problem is that after JOptionPane is closed my applet does not gain the focus again, so it cannot capture ESC key pressed and also the applet is not redrawn properly.

[Darryl Burke]

vladislav, what part of the SSCCE page wasn't clear to you?