Add configuration options for touchpads

[BenJarg]

This may make more sense as a patch, but seems like a somewhat basic configuration option for touchpads (and has been asked for in #141).

[sevz17]

It may worth adding more options, like changing the default accel speed, and also the default accel profile

[pm4rcin]

@sevz17 check my comment here and the one above. Because someone has to make decision how we should handle the configuration.

[sevz17]

It will definitely be by config.h

[BenJarg]

So now this configures disable while typing, the accel speed, and accel profile. Is there anything else reasonable that should be on this list?

[pm4rcin]

Here's all the available options. @sevz17 do we want every option from there?

[BenJarg]

Thanks, perhaps left handed mode and middle button emulation should also be added. I suppose we should decide what exactly to include though, and whether or not we want everything available.

[sevz17]

• tap to click
• tap and drag
• drag lock
• left handled mode
• middle button emulation
• libinput_device_config_scroll_set_method()
• libinput_device_config_send_events_set_mode()
• libinput_device_config_dwtp_set_enabled()

I think these options should be configured, does anyone want to add or remove some of these?

[pm4rcin]

Basically we will have all the options for Touchpad so I think it's good. I think we should provide comments for every option so people don't have to look for docs etc.

[BenJarg]

Ok, I've added everything on that list (except dwtp), and comments with values for the options of things that you would need to look up. I didn't add dwtp because it looks like it won't be available until libinput 1.21, and the latest release is 1.20, so as far as I can tell it's a future setting (someone correct me if I misunderstood the docs).

[sevz17]

Other thing, at least for me it's more understandable place the variables below the comment about it.

[sevz17]

Perhaps the if statement for tap_to_click should be replaced with a similar line if LIBINPUT_CONFIG_TAP_ENABLED is always going to be 1?

Yes, do it.
Also, the comment at the end of the function should be replaced.

[sevz17]

Thanks!