[vtkusers] Adding mouse wheel support to Java GUI components

[Sebastien Jourdain]

Hi Eli,

Sure that would make sense. Please push your patch using gerrit and add me
as a reviewer.

http://www.kitware.com/source/home/post/62

Thanks,

Seb


On Thu, May 29, 2014 at 9:03 PM, E KN <egk865 at gmail.com> wrote:

> 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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