[ASRangeController] Initial implementation of functional-style, ASInterfaceState-based range controller.

AsyncDisplayKit/Details/ASAbstractLayoutController.mm

@@ -14,6 +14,7 @@
 
 @interface ASAbstractLayoutController () {
   std::vector<ASRangeTuningParameters> _tuningParameters;
+  CGSize _viewportSize;
 }
 @end
 
@@ -30,11 +31,11 @@
     .leadingBufferScreenfuls = 0,
     .trailingBufferScreenfuls = 0
   };
-  _tuningParameters[ASLayoutRangeTypeRender] = {
+  _tuningParameters[ASLayoutRangeTypeDisplay] = {
     .leadingBufferScreenfuls = 1.5,
     .trailingBufferScreenfuls = 0.75
   };
-  _tuningParameters[ASLayoutRangeTypePreload] = {
+  _tuningParameters[ASLayoutRangeTypeFetchData] = {
     .leadingBufferScreenfuls = 3,
     .trailingBufferScreenfuls = 2
   };
@@ -60,16 +61,27 @@
 
 #pragma mark - Abstract Index Path Range Support
 
-- (BOOL)shouldUpdateForVisibleIndexPaths:(NSArray *)indexPaths viewportSize:(CGSize)viewportSize rangeType:(ASLayoutRangeType)rangeType
+// FIXME: This method can be removed once ASRangeControllerBeta becomes the main version.
+- (BOOL)shouldUpdateForVisibleIndexPaths:(NSArray *)indexPaths rangeType:(ASLayoutRangeType)rangeType
 {
   ASDisplayNodeAssertNotSupported();
   return NO;
 }
 
-- (NSSet *)indexPathsForScrolling:(ASScrollDirection)scrollDirection viewportSize:(CGSize)viewportSize rangeType:(ASLayoutRangeType)rangeType
+- (NSSet *)indexPathsForScrolling:(ASScrollDirection)scrollDirection rangeType:(ASLayoutRangeType)rangeType
 {
   ASDisplayNodeAssertNotSupported();
   return nil;
 }
 
+- (void)setViewportSize:(CGSize)viewportSize
+{
+  _viewportSize = viewportSize;
+}
+
+- (CGSize)viewportSize
+{
+  return _viewportSize;
+}
+
 @end