[Kdenlive-devel] Drag Value

[Simon Eugster]

Hi Till,

First of all I like the DragValue widget very much. Let's drop the
sliders as soon as possible to save some space.

Some ideas:
* I'm not a big friend of nonlinear scales related to my mouse. (But I
know this is a matter of taste.) I find it quite hard to hit a certain
value, when I want to change from 400 to 100 I first shoot ways below
(ok, only to 0) and when I'm at 90 it takes ages to get to 100, so I
move the mouse a little faster and I'm at 140 already. I just have no
feeling for this. My wish would be a linear scale, and perhaps
slightly less sensitive (2 px per click instead of just one). Ideally
the possibility to switch this on/off in the config dialog
(linear/nonlinear) and to use a custom sensitivity.
(Yes, I _do_ know that I can double-click to enter values directly,
but sometimes the mouse is still faster.)
* Another reason why this widget is not as easy to use as the slider
is (I guess) the missing visual boundaries. For the slider you know
when you are at the lowest or highest value (i.e. you can see the
position of the current value relative to the min/max values). I
currently don't have a good idea how to solve this though.
* There are no live updates atm. I'm adjusting the parameter blindly
and will not see the result until I release the mouse button. Please
do not drop the sliders before this works with the DragValue widget as
well :)

Regarding users, what we can do is let them know about new changes in
the Discover dialog for new releases, in the Changelog, in the
kdenlive blog, perhaps even in the Forums. If a user is too lazy to
read any of these, his bad. (We don't get paid by them … most of them
don't do _anything_ for us.) If a user does not understand the widget
but wants to, he will find a way.
I would not worry about that.

Simon

2011/1/23 Till Theato <root at ttill.de>:
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> Hi,
> as you might have already noticed I replaced the spin boxes for double
> parameters with a new widget I call "drag value".
> It is a wrapper around QLineEdit (not inherited) and adds the
> possibility to change values using the mouse wheel and most importantly
> by starting to drag horizontal on the widget. This does not only require
> less space than a slider and can be accessed faster than KoSliderCombo
> (spinbox with drop down slider used in the title editor) it is also
> possible to skip large ranges (drag fast) and edit precisely (drag slow)
> at the same time.
>
> It did not invent this type of widget, it is also present in some Adobe
> products (After Effects, Premiere) and in Blender and possibly in other
> software, too.
> However I still doubt whether users will find out how to use it.
> Maybe a horizontal resize cursor? This will cover the value when the
> mouse if over the widget ...
> A blog post won't reach everyone...
>
> Any ideas?? If yes we might also consider dropping the slider for
> parameters.
>
> Another issue I have is the stylesheet. If there are multiple parameters
> the size of the widget decreases with every parameter.
> Have a look at the slope parameters in the SOP/Sat effect, for example,
> since they all have the same range.
>
> regards Till
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