_onDataButton question

Question

Using the drawing tool example from the SDK there is a method for the _onDataButton. Is there anyway to determine if this is a button up or button down event? Right now it seems to fire twice if you move the mouse while holding down the button and then release it.

Brien Bastings · Accepted Answer

It's always treated as a down event. By default our tools support a drag operation by just having _OnDataButton called from _OnModelEndDrag. This way the exact same logic can be used for example to create a line by down->drag->up as click, click. 
 
If you want to distinguish between the two, you can override _OnModelEndDrag. HTH 
 
-B