Re: Scrolling differences when using Trackpad or Mouse-Wheel
Re: Scrolling differences when using Trackpad or Mouse-Wheel
- Subject: Re: Scrolling differences when using Trackpad or Mouse-Wheel
- From: Richard Charles <email@hidden>
- Date: Sat, 23 Jun 2018 09:55:35 -0600
> On Jun 19, 2018, at 3:56 AM, Michael Starke
> <email@hidden> wrote:
>
> I'm currently trying to find the bottleneck in my app MacPass that's causing
> the scrolling in the main table to be sluggish.
>
> Before diving deeply into Instruments to find the culprit I realized that
> scrolling with the trackpad is butter-smooth but scrolling using the mouse
> wheel is rather slow. When I start to scroll down, there's a slight delay but
> then the scrolling works smooth. This is not the case when scrolling up or
> when scrolling using the trackpad.
I downloaded MacPass 0.7.3 and created a new document with 200 entries in what
I believe to be the MPTableView. I tried scrolling with a Logitech M510 mouse
wheel using the standard apple driver (no custom driver installed). I also
tried scrolling with track pad on a MacBook Air.
Normally a mouse wheel with detents will have acceleration when scrolling but
no momentum. Normally trackpad will have momentum when scrolling. This behavior
can be seen when scrolling in TextEdit, Contacts, and Mail.
When scrolling in MacPass with a mouse wheel the initial delay I believe is due
to acceleration which appears to be normal. However when mouse wheel movement
has stopped scrolling still persists for a short period of time almost
appearing to be momentum. This is not normal. A mouse wheel has no momentum if
it has detents. So this is a puzzle.
--Richard Charles
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