Re: [Usability] Mousetweaks usability discussion
- From: Willie Walker <William Walker Sun COM>
- To: Caleb Marcus <caleb marcus gmail com>
- Cc: Thomas Wood <thos gnome org>, gnome-accessibility-devel gnome org, Rodrigo Moya <rodrigo gnome-db org>, gnomecc-list gnome org, gnome-accessibility-list gnome org, usability gnome org, Vincent Untz <vuntz gnome org>, desktop-devel-list gnome org
- Subject: Re: [Usability] Mousetweaks usability discussion
- Date: Thu, 01 Nov 2007 12:46:12 -0000
I definitely like the mockups -- nice work!
Regarding the mouse keys settings, one needs to take into consideration
that the target users of this are people with differing physical
abilities who may need finer control over the parameters. This might
possibly result in more knobs and dials, but they could be the thing
that allows someone to use the computer for their job.
If we're going to redesign the UI, we should engage the target users in
a discussion about their needs and create the UI for them. We have
contact with a number of users, so getting real input shouldn't be too hard.
If I recall correctly from the AccessX implementation in XKB, there are
a number of settings for mouse movement. This is just for background,
by the way; I'm not proposing a knob/dial/button for each thing:
* The values on the key itself - these are performed whenever the user
first presses a key associated with mouse movement (and mouse keys is
* x, y: pixel values
* noAccel: boolean specifying whether acceleration ("autorepeat")
should be used or not
* absoluteX, boolean values specifying whether or not the x,y values
absoluteY: are absolute screen coordinates or relative to the
current mouse position
The de facto values in the typical XKB keymaps set these values to
a relative movement of 1 pixel with acceleration. I think there is
an option to toggle acceleration at a global level, but I cannot
* Settings in the XKB extension that are used to manage movement when
the user presses and holds a key:
* mouseKeysDelay - just like keyboard autorepeat: how long in
milliseconds before the 'acceleration' starts happening.
* mouseKeysInterval - just like keyboard autorepeat: the time
in milliseconds between movement events after the mouseKeysDelay
* mouseKeysTimeToMax - this defines how quickly the mouse
will reach maximum speed as the user presses/holds a key.
If noAccel is True for the key, the maximum speed is kind
of meaningless: the movement will just be the x,y value every
mouseKeysInterval. Otherwise, mouseKeysCurve and
mouseKeysMaxSpeed will be used.
* mouseKeysCurve - defines the shape of the acceleration.
The actual values are a mystery to me, but a value of 0 is
a linear acceleration. A negative value results in an
initially quicker acceleration which then decreases. A positive
value results in an initially slower acceleration which then
* mouseKeysMaxSpeed - this defines the maximum speed of the
mouse. I'm not sure what the actual units of this are.
For example, I'm not sure if speed is determined by keeping
the mouseKeysInterval constant and changing the distance
the mouse moves for each interval or if the distance the
mouse moves remains constant and the interval changes.
Anyway, my main point is to ask real users about what tasks they
typically want to accomplish with mouse keys. Then, figure out the best
UI that provides the user with the ability to customize mouse keys
behavior so they can accomplish these tasks efficiently. The reason I
list the XKB/AccessX stuff above is that they provide the main technical
constraints to can help/hinder providing what the end user really needs.
Caleb Marcus wrote:
Actually, after more experimentation, it seems that my last message is
incorrect about the functions of the two sliders... and I've also come
to the conclusion that I'll never get my mouse settings just right
again. Yeah, this is definitely something that needs to be fixed, UI-wise.
On Wed, 2007-10-31 at 22:09 +0000, Thomas Wood wrote:
On 31 Oct 2007, at 13:54, Denis Washington wrote:
> On Wed, 2007-10-31 at 13:44 +0100, Rodrigo Moya wrote:
>> On Tue, 2007-10-30 at 19:20 +0100, Vincent Untz wrote:
>>> Le samedi 13 octobre 2007, à 14:25 +0200, Francesco Fumanti a écrit :
>>>> I have made a mockup that integrates Mousetweaks settings into the
> I hope I haven't forgotten everything. Comments?
Did we discuss combining acceleration and sensitivity at one point?
I've never really understood the difference between the two (or rather,
I've never decided how each one affects my own usage). Would it be
possible to just have one slider that adjusts the two values in a sane
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