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Type ReactRef #7600
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Type ReactRef #7600
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Original file line number | Diff line number | Diff line change |
---|---|---|
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@@ -7,12 +7,16 @@ | |
* of patent rights can be found in the PATENTS file in the same directory. | ||
* | ||
* @providesModule ReactRef | ||
* @flow | ||
*/ | ||
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'use strict'; | ||
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var ReactOwner = require('ReactOwner'); | ||
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import type { ReactInstance } from 'ReactInstanceType'; | ||
import type { ReactElement } from 'ReactElementType'; | ||
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var ReactRef = {}; | ||
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function attachRef(ref, component, owner) { | ||
|
@@ -33,8 +37,11 @@ function detachRef(ref, component, owner) { | |
} | ||
} | ||
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ReactRef.attachRefs = function(instance, element) { | ||
if (element === null || element === false) { | ||
ReactRef.attachRefs = function( | ||
instance: ReactInstance, | ||
element: ReactElement | string | number | null | false, | ||
): void { | ||
if (element === null || typeof element !== 'object') { | ||
return; | ||
} | ||
var ref = element.ref; | ||
|
@@ -43,7 +50,10 @@ ReactRef.attachRefs = function(instance, element) { | |
} | ||
}; | ||
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ReactRef.shouldUpdateRefs = function(prevElement, nextElement) { | ||
ReactRef.shouldUpdateRefs = function( | ||
prevElement: ReactElement | string | number | null | false, | ||
nextElement: ReactElement | string | number | null | false, | ||
): bool { | ||
// If either the owner or a `ref` has changed, make sure the newest owner | ||
// has stored a reference to `this`, and the previous owner (if different) | ||
// has forgotten the reference to `this`. We use the element instead | ||
|
@@ -56,21 +66,32 @@ ReactRef.shouldUpdateRefs = function(prevElement, nextElement) { | |
// is made. It probably belongs where the key checking and | ||
// instantiateReactComponent is done. | ||
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var prevEmpty = prevElement === null || prevElement === false; | ||
var nextEmpty = nextElement === null || nextElement === false; | ||
var prevRef = null; | ||
var prevOwner = null; | ||
if (prevElement !== null && typeof prevElement === 'object') { | ||
prevRef = prevElement.ref; | ||
prevOwner = prevElement._owner; | ||
} | ||
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var nextRef = null; | ||
var nextOwner = null; | ||
if (nextElement !== null && typeof nextElement === 'object') { | ||
nextRef = nextElement.ref; | ||
nextOwner = nextElement._owner; | ||
} | ||
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return ( | ||
// This has a few false positives w/r/t empty components. | ||
prevEmpty || nextEmpty || | ||
nextElement.ref !== prevElement.ref || | ||
prevRef !== nextRef || | ||
// If owner changes but we have an unchanged function ref, don't update refs | ||
(typeof nextElement.ref === 'string' && | ||
nextElement._owner !== prevElement._owner) | ||
(typeof nextRef === 'string' && nextOwner !== prevOwner) | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. All the tests are passing but i'd love a second pair of eyes to know if this is safe |
||
); | ||
}; | ||
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ReactRef.detachRefs = function(instance, element) { | ||
if (element === null || element === false) { | ||
ReactRef.detachRefs = function( | ||
instance: ReactInstance, | ||
element: ReactElement | string | number | null | false, | ||
): void { | ||
if (element === null || typeof element !== 'object') { | ||
return; | ||
} | ||
var ref = element.ref; | ||
|
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flow is not smart enough to know that this check is flowing through the variable for the next condition