WxPandaWindow.OpenGLPandaWindow does not support mouse wheel

[Craig Macomber]

OpenGLPandaWindow in direct.wxwidgets.WxPandaWindow does not forward mouse wheel events from wx.

Fix:

add this bind:

self.Bind(wx.EVT_MOUSEWHEEL, self.__mouseWheel)

add this method:

    def __mouseWheel(self, event):
        amount=event.GetWheelRotation()
        if amount>0.0:
            self.inputDevice.buttonDown(MouseButton.wheelUp())
            self.inputDevice.buttonUp(MouseButton.wheelUp())
        elif amount<0.0:
            self.inputDevice.buttonDown(MouseButton.wheelDown())
            self.inputDevice.buttonUp(MouseButton.wheelDown())

Issues with this fix:
scroll amount is not forwarded.
does not scroll until you click on the panda window to focus is.

This fix can be added to a subclass as a workaround until it makes it into panda.

[rdb (rdb)]

Thanks for providing a fix.