Fix passing ref to functional components (#153)

[mogzol]

See issue #153

Previously, using a functional component as the child of a Trigger would cause React to give console errors due to rc-trigger passing a ref to the child, which is not allowed in functional components. This adds a check for functional components and avoids passing them a ref when encountered. Other components (classes and plain elements) are not affected, and will behave the same as before.

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[codecov]

Codecov Report

Merging #156 into master will increase coverage by 0.14%.
The diff coverage is 100%.

@@ Coverage Diff @@## master #156 +/- ##
==========================================
+ Coverage 85.27% 85.42% +0.14% 
==========================================
Files 7 7 Lines 489 494 +5 Branches 136 140 +4 ==========================================
+ Hits 417 422 +5 
Misses 72 72

Impacted Files	Coverage Δ
src/index.tsx	82.22% <100%> (+0.27%)	⬆️

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[mogzol]

Updated to resolve conflicts. @zombieJ any chance of getting this (and also #158) merged? They are affecting my ability to use rc-trigger in my projects.

[zombieJ]

hi @mogzolm, this warning is by expect. Since we don't want user missing passing ref and have to use findDOMNode which is mark as deprecated in StrictMode.

ref:

trigger/src/index.tsx

Line 439 in 2cd87ca

returnReactDOM.findDOMNode(this)asHTMLElement;

[mogzol]

Ah, I see. OK so rc-trigger can't really support function components then (without using findDOMNode). So the proper solution is for users to modify their code so that any child of rc-trigger will accept refs (with something like forwardRef, or rewriting the components into class components).

Alright, that's fair, I'll close this.

[zombieJ]

Yes. Before fragment refs RFC merge, we still need this as fallback.

ref: reactjs/rfcs#97