[vtkusers] Adding mouse wheel support to Java GUI components

[E KN]

Hi Seb,

Thank you so much for all your work on the Java wrappers. I was wondering
if there is interest in adding mouse wheel support to the Java GUI
components. I was able to add mouse wheel support by making the
vtkInteractorForwarder class implement the MouseWheelListener interface and
adding the following function:

    @Override
    public void mouseWheelMoved(MouseWheelEvent e) {
        if (component == null || component.getRenderer() == null) {
            return;
        }

        // Allow user to override some behavior
        if (this.eventInterceptor != null &&
this.eventInterceptor.mouseWheelMoved(e)) {
            return;
        }

        try {
            component.getVTKLock().lockInterruptibly();

component.getRenderWindow().SetDesiredUpdateRate(this.updateRateRelease);
            lastX = e.getX();
            lastY = e.getY();
            ctrlPressed = (e.getModifiers() & InputEvent.CTRL_MASK) ==
InputEvent.CTRL_MASK ? 1 : 0;
            shiftPressed = (e.getModifiers() & InputEvent.SHIFT_MASK) ==
InputEvent.SHIFT_MASK ? 1 : 0;

component.getRenderWindowInteractor().SetEventInformationFlipY(lastX,
lastY, ctrlPressed, shiftPressed, '0', 0, "0");
            if (e.getWheelRotation() > 0)

component.getRenderWindowInteractor().MouseWheelBackwardEvent();
            else

component.getRenderWindowInteractor().MouseWheelForwardEvent();
        }
        catch (InterruptedException interupt) {
            // Nothing to do
        }
        finally {
            component.getVTKLock().unlock();
        }
    }

A few other minor changes are needed as well in a few other Java files.
Would this be of interest?

Thanks,
Eli
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