I'm using enaml and trying to get a slider that can also be controlled with the arrow keys. I've used the slide example from the gallery (which doesn't work out-of-the-box, and gives a math domain error, but can be fixed by removing the log). According to the slider documentation there is a single_step property that:
defines the number of steps that the slider will move when the user presses the arrow keys
This seems to have a default of 1, but in my case nothing happens when I press the arrow keys. I wrote it explicitly under Slider: (and tried using larger values), but to no avail. Nothing seems to happen when I press the arrow keys.
I'm using enable 0.6.8 from Canopy in OS X, with the Qt backend. I wonder if this is a backend limitation? I had similar issues with sliders not being able to be controlled with the keyboard with TraitsUI as well.
Enaml 0.6.8 is 30 versions old now. Please upgrade to the latest version. The Anaconda distribution ships with a reasonably recent version of Enaml.
That being said, this issue is still present in trunk. It looks to be an issue on OSX|Qt when a slider is a sibling of another widget which can accept focus. For reasons which I have not yet pinned down, the QSlider will not gain input focus on click or tab press.
On Windows, everything works as advertised.
Feel free to open a ticket, and I'll dig into it more when I have some free time: https://github.com/nucleic/enaml