[ASRelativeLayoutSpec] Fix ASRelatativeLayoutSpec behavior for ASRelativeLayoutSpecPositionStart (#2393)

* Fix ASRelatativeLayoutSpec behavior for ASRelativeLayoutSpecPositionStart

* Add updated images for snapshot tests

AsyncDisplayKit/Layout/ASCenterLayoutSpec.h

@@ -49,9 +49,7 @@ NS_ASSUME_NONNULL_BEGIN
  * Initializer.
  *
  * @param centeringOptions How the child is centered.
- *
  * @param sizingOptions How much space will be taken up.
- *
  * @param child The child to center.
  */
 + (instancetype)centerLayoutSpecWithCenteringOptions:(ASCenterLayoutSpecCenteringOptions)centeringOptions

AsyncDisplayKit/Layout/ASCenterLayoutSpec.mm

@@ -58,21 +58,19 @@
 
 - (ASRelativeLayoutSpecPosition)horizontalPositionFromCenteringOptions:(ASCenterLayoutSpecCenteringOptions)centeringOptions
 {
-  BOOL centerX =  (centeringOptions & ASCenterLayoutSpecCenteringX) != 0;
-  if (centerX) {
+  if ((centeringOptions & ASCenterLayoutSpecCenteringX) != 0) {
     return ASRelativeLayoutSpecPositionCenter;
   } else {
-    return ASRelativeLayoutSpecPositionStart;
+    return ASRelativeLayoutSpecPositionNone;
   }
 }
 
 - (ASRelativeLayoutSpecPosition)verticalPositionFromCenteringOptions:(ASCenterLayoutSpecCenteringOptions)centeringOptions
 {
-  BOOL centerY =  (centeringOptions & ASCenterLayoutSpecCenteringY) != 0;
-  if (centerY) {
+  if ((centeringOptions & ASCenterLayoutSpecCenteringY) != 0) {
     return ASRelativeLayoutSpecPositionCenter;
   } else {
-    return ASRelativeLayoutSpecPositionStart;
+    return ASRelativeLayoutSpecPositionNone;
   }
 }
 

AsyncDisplayKit/Layout/ASRatioLayoutSpec.mm

@@ -60,15 +60,15 @@
 - (ASLayout *)calculateLayoutThatFits:(ASSizeRange)constrainedSize
 {
   std::vector<CGSize> sizeOptions;
-  // TODO: layout: isValidForLayout() call should not be necessary if INFINITY is used
-  if (!isinf(constrainedSize.max.width) && ASPointsValidForLayout(constrainedSize.max.width)) {
+  
+  if (ASPointsValidForSize(constrainedSize.max.width)) {
     sizeOptions.push_back(ASSizeRangeClamp(constrainedSize, {
       constrainedSize.max.width,
       ASFloorPixelValue(_ratio * constrainedSize.max.width)
     }));
   }
-  // TODO: layout: isValidForLayout() call should not be necessary if INFINITY is used
-  if (!isinf(constrainedSize.max.height) && ASPointsValidForLayout(constrainedSize.max.width)) {
+  
+  if (ASPointsValidForSize(constrainedSize.max.width)) {
     sizeOptions.push_back(ASSizeRangeClamp(constrainedSize, {
       ASFloorPixelValue(constrainedSize.max.height / _ratio),
       constrainedSize.max.height

AsyncDisplayKit/Layout/ASRelativeLayoutSpec.h

@@ -13,13 +13,15 @@
 #import <AsyncDisplayKit/ASLayoutSpec.h>
 
 /** How the child is positioned within the spec. */
-typedef NS_OPTIONS(NSUInteger, ASRelativeLayoutSpecPosition) {
+typedef NS_ENUM(NSUInteger, ASRelativeLayoutSpecPosition) {
+  /** The child is positioned at point 0 */ 
+  ASRelativeLayoutSpecPositionNone = 0,
   /** The child is positioned at point 0 relatively to the layout axis (ie left / top most) */
-    ASRelativeLayoutSpecPositionStart = 0,
+  ASRelativeLayoutSpecPositionStart = 1,
   /** The child is centered along the specified axis */
-    ASRelativeLayoutSpecPositionCenter = 1 << 0,
+  ASRelativeLayoutSpecPositionCenter = 2,
   /** The child is positioned at the maximum point of the layout axis (ie right / bottom most) */
-    ASRelativeLayoutSpecPositionEnd = 1 << 1,
+  ASRelativeLayoutSpecPositionEnd = 3,
 };
 
 /** How much space the spec will take up. */

AsyncDisplayKit/Layout/ASRelativeLayoutSpec.mm

@@ -54,31 +54,21 @@
 
 - (ASLayout *)calculateLayoutThatFits:(ASSizeRange)constrainedSize
 {
-  // If we have a finite size in any direction, pass this so that the child can
-  // resolve percentages against it. Otherwise pass ASLayoutElementParentDimensionUndefined
-  // as the size will depend on the content
-  // TODO: layout: isValidForLayout() call should not be necessary if INFINITY is used
+  // If we have a finite size in any direction, pass this so that the child can resolve percentages against it.
+  // Otherwise pass ASLayoutElementParentDimensionUndefined as the size will depend on the content
   CGSize size = {
-    isinf(constrainedSize.max.width) || !ASPointsValidForLayout(constrainedSize.max.width) ? ASLayoutElementParentDimensionUndefined : constrainedSize.max.width,
-    isinf(constrainedSize.max.height) || !ASPointsValidForLayout(constrainedSize.max.height) ? ASLayoutElementParentDimensionUndefined : constrainedSize.max.height
+    ASPointsValidForSize(constrainedSize.max.width) == NO ? ASLayoutElementParentDimensionUndefined : constrainedSize.max.width,
+    ASPointsValidForSize(constrainedSize.max.height) == NO ? ASLayoutElementParentDimensionUndefined : constrainedSize.max.height
   };
   
-  BOOL reduceWidth = (_horizontalPosition & ASRelativeLayoutSpecPositionCenter) != 0 ||
-  (_horizontalPosition & ASRelativeLayoutSpecPositionEnd) != 0;
-  
-  BOOL reduceHeight = (_verticalPosition & ASRelativeLayoutSpecPositionCenter) != 0 ||
-  (_verticalPosition & ASRelativeLayoutSpecPositionEnd) != 0;
-  
   // Layout the child
   const CGSize minChildSize = {
-    reduceWidth ? 0 : constrainedSize.min.width,
-    reduceHeight ? 0 : constrainedSize.min.height,
+    (_horizontalPosition != ASRelativeLayoutSpecPositionNone) ? 0 : constrainedSize.min.width,
+    (_verticalPosition != ASRelativeLayoutSpecPositionNone) ? 0 : constrainedSize.min.height,
   };
-  
   ASLayout *sublayout = [self.child layoutThatFits:ASSizeRangeMake(minChildSize, constrainedSize.max) parentSize:size];
   
-  // If we have an undetermined height or width, use the child size to define the layout
-  // size
+  // If we have an undetermined height or width, use the child size to define the layout size
   size = ASSizeRangeClamp(constrainedSize, {
     isfinite(size.width) == NO ? sublayout.size.width : size.width,
     isfinite(size.height) == NO ? sublayout.size.height : size.height
@@ -104,9 +94,9 @@
 
 - (CGFloat)proportionOfAxisForAxisPosition:(ASRelativeLayoutSpecPosition)position
 {
-  if ((position & ASRelativeLayoutSpecPositionCenter) != 0) {
+  if (position == ASRelativeLayoutSpecPositionCenter) {
     return 0.5f;
-  } else if ((position & ASRelativeLayoutSpecPositionEnd) != 0) {
+  } else if (position == ASRelativeLayoutSpecPositionEnd) {
     return 1.0f;
   } else {
     return 0.0f;

AsyncDisplayKitTests/ASAbsoluteLayoutSpecSnapshotTests.m

@@ -63,7 +63,8 @@
 
   ASLayoutSpec *layoutSpec =
   [ASBackgroundLayoutSpec backgroundLayoutSpecWithChild:
-   [ASAbsoluteLayoutSpec absoluteLayoutSpecWithChildren:children]
+   [ASAbsoluteLayoutSpec
+    absoluteLayoutSpecWithChildren:children]
    background:backgroundNode];
   
   [self testLayoutSpec:layoutSpec sizeRange:sizeRange subnodes:subnodes identifier:identifier];

AsyncDisplayKitTests/ASRelativeLayoutSpecSnapshotTests.mm

@@ -21,6 +21,16 @@ static const ASSizeRange kSize = {{100, 120}, {320, 160}};
 
 @implementation ASRelativeLayoutSpecSnapshotTests
 
+#pragma mark - XCTestCase
+
+- (void)setUp
+{
+  [super setUp];
+  
+  self.recordMode = NO;
+}
+
+
 - (void)testWithOptions
 {
   [self testAllVerticalPositionsForHorizontalPosition:ASRelativeLayoutSpecPositionStart];
@@ -29,7 +39,8 @@ static const ASSizeRange kSize = {{100, 120}, {320, 160}};
 
 }
 
-- (void)testAllVerticalPositionsForHorizontalPosition:(ASRelativeLayoutSpecPosition)horizontalPosition {
+- (void)testAllVerticalPositionsForHorizontalPosition:(ASRelativeLayoutSpecPosition)horizontalPosition
+{
   [self testWithHorizontalPosition:horizontalPosition verticalPosition:ASRelativeLayoutSpecPositionStart sizingOptions:{}];
   [self testWithHorizontalPosition:horizontalPosition verticalPosition:ASRelativeLayoutSpecPositionCenter sizingOptions:{}];
   [self testWithHorizontalPosition:horizontalPosition verticalPosition:ASRelativeLayoutSpecPositionEnd sizingOptions:{}];
@@ -80,15 +91,15 @@ static NSString *suffixForPositionOptions(ASRelativeLayoutSpecPosition horizonta
 {
   NSMutableString *suffix = [NSMutableString string];
 
-  if ((horizontalPosition & ASRelativeLayoutSpecPositionCenter) != 0) {
+  if (horizontalPosition == ASRelativeLayoutSpecPositionCenter) {
     [suffix appendString:@"CenterX"];
-  } else if ((horizontalPosition & ASRelativeLayoutSpecPositionEnd) != 0) {
+  } else if (horizontalPosition == ASRelativeLayoutSpecPositionEnd) {
     [suffix appendString:@"EndX"];
   }
 
-  if ((verticalPosition & ASRelativeLayoutSpecPositionCenter) != 0) {
+  if (verticalPosition  == ASRelativeLayoutSpecPositionCenter) {
     [suffix appendString:@"CenterY"];
-  } else if ((verticalPosition & ASRelativeLayoutSpecPositionEnd) != 0) {
+  } else if (verticalPosition == ASRelativeLayoutSpecPositionEnd) {
     [suffix appendString:@"EndY"];
   }
 
@@ -122,8 +133,8 @@ static NSString *suffixForPositionOptions(ASRelativeLayoutSpecPosition horizonta
   
   ASRelativeLayoutSpec *layoutSpec =
   [ASRelativeLayoutSpec
-   relativePositionLayoutSpecWithHorizontalPosition:ASRelativeLayoutSpecPositionStart
-   verticalPosition:ASRelativeLayoutSpecPositionStart
+   relativePositionLayoutSpecWithHorizontalPosition:ASRelativeLayoutSpecPositionNone
+   verticalPosition:ASRelativeLayoutSpecPositionNone
    sizingOption:{}
    child:childSpec];