Messages

1

Window / MouseWheel Delta Value

« on: January 15, 2010, 11:51:59 am »

The MSDN clearly states that the delta value given by the OS is a multiple of 120, that's why I divide by this value, so that one wheel step == 1 and not 120.

It actually says 'The high-order word indicates the distance the wheel is rotated, expressed in multiples or divisions of WHEEL_DELTA, which is 120', so we miss any events that are divisions of 120...

2

Window / MouseWheel Delta Value

« on: January 15, 2010, 12:43:30 am »

I have found that the mouse wheel is extremely unresponsive when using the delta provided by WindowImplWin32::ProcessEvent.

Removing the division by 120 in that function solves the problem and gives me smooth scrolling movement.

I am using a Microsoft Wireless Intellimouse Explorer 2.0, which I would presume is quite standard in operation.

There must be a reason for that seemingly arbitary value of 120, maybe a hardware issue?

Is anyone else using mouse wheel events to achieve smooth scrolling?  If so, did you also have to change the delta value?