Add option to prevent firing multiple directions

[vietnogi]

Problem
User is swiping up but also to the right and firing events for swiping right causing unintentional functionality.

Use Case
User is scrolling up a list but its not straight so causing UX for swiping right.

Solution
Add add an option to prevent mix directions during a single swipe. A state for the initial direction is set and will be use to compare subsequent swipe movements. If the option is set and if the swipe direction changes, then we do not fire the event.

Before Example

After Example

[hartzis]

@vietnogi Thank you for this! This is awesome and something i've also noticed before.

I think this will be a great addition and possibly even be on by default, what are your thoughts?

I have it added to the v7 project!

Do you think you'd be able to add a test?

[hartzis]

❓ maybe off by default and change name more to its intent like onlyUniDirectionalSwipes?

• trackInitialDirection
• onlyOneDirection
• preventMixDirections ( current in this PR )
• noMixedDirections
• onlyInitialDirection

If it were the opposite and on by default:

• allowMultiDirectionSwipe
• allowFinalDirection
• callLastDirection

[hartzis]

• Need to adjust where initialDirection is set to happen after delta check.
• need test(s) for new functionality

moving out of v7 for now, but we can totally add this functionality after as backwards compatible 👍

[hartzis]

🤔 i think we'd need to actually set initialDirection outside of the catch for delta. We should probably only count the initial direction once the user has surpassed the delta which signifies the start of a "swipe" or "swiping"