Import css-layout measure mode changes from pull request react#163

Reviewed By: astreet

Differential Revision: D3059432

fb-gh-sync-id: 56cc13ffbc4805aa0789df62a04e19f23a438bd3
fbshipit-source-id: 56cc13ffbc4805aa0789df62a04e19f23a438bd3

Author: Emil Sjolander

Libraries/Text/RCTShadowText.m

@@ -30,10 +30,10 @@ @implementation RCTShadowText
   CGFloat _effectiveLetterSpacing;
 }
 
-static css_dim_t RCTMeasure(void *context, float width, float height)
+static css_dim_t RCTMeasure(void *context, float width, css_measure_mode_t widthMode, float height, css_measure_mode_t heightMode)
 {
   RCTShadowText *shadowText = (__bridge RCTShadowText *)context;
-  NSTextStorage *textStorage = [shadowText buildTextStorageForWidth:width];
+  NSTextStorage *textStorage = [shadowText buildTextStorageForWidth:width widthMode:widthMode];
   NSLayoutManager *layoutManager = textStorage.layoutManagers.firstObject;
   NSTextContainer *textContainer = layoutManager.textContainers.firstObject;
   CGSize computedSize = [layoutManager usedRectForTextContainer:textContainer].size;
@@ -89,7 +89,7 @@ - (void)contentSizeMultiplierDidChange:(NSNotification *)note
   UIEdgeInsets padding = self.paddingAsInsets;
   CGFloat width = self.frame.size.width - (padding.left + padding.right);
 
-  NSTextStorage *textStorage = [self buildTextStorageForWidth:width];
+  NSTextStorage *textStorage = [self buildTextStorageForWidth:width widthMode:CSS_MEASURE_MODE_EXACTLY];
   [applierBlocks addObject:^(NSDictionary<NSNumber *, RCTText *> *viewRegistry) {
     RCTText *view = viewRegistry[self.reactTag];
     view.textStorage = textStorage;
@@ -106,7 +106,7 @@ - (void)applyLayoutNode:(css_node_t *)node
   [self dirtyPropagation];
 }
 
-- (NSTextStorage *)buildTextStorageForWidth:(CGFloat)width
+- (NSTextStorage *)buildTextStorageForWidth:(CGFloat)width widthMode:(css_measure_mode_t)widthMode
 {
   if (_cachedTextStorage && width == _cachedTextStorageWidth) {
     return _cachedTextStorage;
@@ -121,7 +121,7 @@ - (NSTextStorage *)buildTextStorageForWidth:(CGFloat)width
   textContainer.lineFragmentPadding = 0.0;
   textContainer.lineBreakMode = _numberOfLines > 0 ? NSLineBreakByTruncatingTail : NSLineBreakByClipping;
   textContainer.maximumNumberOfLines = _numberOfLines;
-  textContainer.size = (CGSize){isnan(width) ? CGFLOAT_MAX : width, CGFLOAT_MAX};
+  textContainer.size = (CGSize){widthMode == CSS_MEASURE_MODE_UNDEFINED ? CGFLOAT_MAX : width, CGFLOAT_MAX};
 
   [layoutManager addTextContainer:textContainer];
   [layoutManager ensureLayoutForTextContainer:textContainer];