[Gallery layout] Include the caller in properties providing methods (#533)

* Include the caller in ASCollectionGalleryLayoutPropertiesProviding's methods

* Update CHANGELOG.md

CHANGELOG.md

@@ -18,6 +18,7 @@
 - [Breaking] Remove APIs that have been deprecated since 2.0 and/or for at least 6 months [Huy Nguyen](https://github.com/nguyenhuy) [#529](https://github.com/TextureGroup/Texture/pull/529)
 - [ASDisplayNode] Ensure `-displayWillStartAsynchronously:` and `-displayDidFinish` are invoked on rasterized subnodes.  [Eric Scheers](https://github.com/smeis) [#532](https://github.com/TextureGroup/Texture/pull/532)
 - Fixed a memory corruption issue in the ASImageNode display system. [Adlai Holler](https://github.com/Adlai-Holler) [#555](https://github.com/TextureGroup/Texture/pull/555)
+- [Breaking] Rename ASCollectionGalleryLayoutSizeProviding to ASCollectionGalleryLayoutPropertiesProviding. Besides a fixed item size, it now can provide interitem and line spacings, as well as section inset [Huy Nguyen](https://github.com/nguyenhuy) [#496](https://github.com/TextureGroup/Texture/pull/496) [#533](https://github.com/TextureGroup/Texture/pull/533)
 
 ##2.4
 - Fix an issue where inserting/deleting sections could lead to inconsistent supplementary element behavior. [Adlai Holler](https://github.com/Adlai-Holler)

Source/ASPagerNode.m

@@ -145,7 +145,7 @@
 
 #pragma mark - ASCollectionGalleryLayoutPropertiesProviding
 
-- (CGSize)sizeForElements:(ASElementMap *)elements
+- (CGSize)galleryLayoutDelegate:(nonnull ASCollectionGalleryLayoutDelegate *)delegate sizeForElements:(nonnull ASElementMap *)elements
 {
   ASDisplayNodeAssertMainThread();
   return [self pageSize];

Source/Details/ASCollectionGalleryLayoutDelegate.h

@@ -14,6 +14,7 @@
 #import <AsyncDisplayKit/ASScrollDirection.h>
 
 @class ASElementMap;
+@class ASCollectionGalleryLayoutDelegate;
 
 NS_ASSUME_NONNULL_BEGIN
 
@@ -24,11 +25,13 @@ NS_ASSUME_NONNULL_BEGIN
  *
  * @discussion This method will only be called on main thread.
  *
+ * @param delegate The calling object.
+ *
  * @param elements All elements to be sized.
  *
  * @return The elements' size
  */
-- (CGSize)sizeForElements:(ASElementMap *)elements;
+- (CGSize)galleryLayoutDelegate:(ASCollectionGalleryLayoutDelegate *)delegate sizeForElements:(ASElementMap *)elements;
 
 @optional
 
@@ -42,11 +45,13 @@ NS_ASSUME_NONNULL_BEGIN
  * It is not applied between the first line and the header, or between the last line and the footer.
  * This is the same behavior as UICollectionViewFlowLayout's minimumLineSpacing.
  *
+ * @param delegate The calling object.
+ *
  * @param elements All elements in the layout.
  *
  * @return The interitem spacing
  */
-- (CGFloat)minimumLineSpacingForElements:(ASElementMap *)elements;
+- (CGFloat)galleryLayoutDelegate:(ASCollectionGalleryLayoutDelegate *)delegate minimumLineSpacingForElements:(ASElementMap *)elements;
 
 /**
  * Returns the minumum spacing to use between items in the same row or column, depending on the scroll directions.
@@ -58,22 +63,26 @@ NS_ASSUME_NONNULL_BEGIN
  * It is considered while fitting items into lines, but the actual final spacing between some items might be larger.
  * This is the same behavior as UICollectionViewFlowLayout's minimumInteritemSpacing.
  *
+ * @param delegate The calling object.
+ *
  * @param elements All elements in the layout.
  *
  * @return The interitem spacing
  */
-- (CGFloat)minimumInteritemSpacingForElements:(ASElementMap *)elements;
+- (CGFloat)galleryLayoutDelegate:(ASCollectionGalleryLayoutDelegate *)delegate minimumInteritemSpacingForElements:(ASElementMap *)elements;
 
 /**
  * Returns the margins of each section.
  *
  * @discussion This method will only be called on main thread.
  *
+ * @param delegate The calling object.
+ *
  * @param elements All elements in the layout.
  *
  * @return The margins used to layout content in a section
  */
-- (UIEdgeInsets)sectionInsetForElements:(ASElementMap *)elements;
+- (UIEdgeInsets)galleryLayoutDelegate:(ASCollectionGalleryLayoutDelegate *)delegate sectionInsetForElements:(ASElementMap *)elements;
 
 @end
 

Source/Details/ASCollectionGalleryLayoutDelegate.mm

@@ -66,9 +66,9 @@
     _propertiesProviderFlags = {};
   } else {
     _propertiesProvider = propertiesProvider;
-    _propertiesProviderFlags.minimumLineSpacingForElements = [_propertiesProvider respondsToSelector:@selector(minimumLineSpacingForElements:)];
-    _propertiesProviderFlags.minimumInteritemSpacingForElements = [_propertiesProvider respondsToSelector:@selector(minimumInteritemSpacingForElements:)];
-    _propertiesProviderFlags.sectionInsetForElements = [_propertiesProvider respondsToSelector:@selector(sectionInsetForElements:)];
+    _propertiesProviderFlags.minimumLineSpacingForElements = [_propertiesProvider respondsToSelector:@selector(galleryLayoutDelegate:minimumLineSpacingForElements:)];
+    _propertiesProviderFlags.minimumInteritemSpacingForElements = [_propertiesProvider respondsToSelector:@selector(galleryLayoutDelegate:minimumInteritemSpacingForElements:)];
+    _propertiesProviderFlags.sectionInsetForElements = [_propertiesProvider respondsToSelector:@selector(galleryLayoutDelegate:sectionInsetForElements:)];
   }
 }
 
@@ -80,10 +80,10 @@
     return nil;
   }
 
-  CGSize itemSize = [propertiesProvider sizeForElements:elements];
-  UIEdgeInsets sectionInset = _propertiesProviderFlags.sectionInsetForElements ? [propertiesProvider sectionInsetForElements:elements] : UIEdgeInsetsZero;
-  CGFloat lineSpacing = _propertiesProviderFlags.minimumLineSpacingForElements ? [propertiesProvider minimumLineSpacingForElements:elements] : 0.0;
-  CGFloat interitemSpacing = _propertiesProviderFlags.minimumInteritemSpacingForElements ? [propertiesProvider minimumInteritemSpacingForElements:elements] : 0.0;
+  CGSize itemSize = [propertiesProvider galleryLayoutDelegate:self sizeForElements:elements];
+  UIEdgeInsets sectionInset = _propertiesProviderFlags.sectionInsetForElements ? [propertiesProvider galleryLayoutDelegate:self sectionInsetForElements:elements] : UIEdgeInsetsZero;
+  CGFloat lineSpacing = _propertiesProviderFlags.minimumLineSpacingForElements ? [propertiesProvider galleryLayoutDelegate:self minimumLineSpacingForElements:elements] : 0.0;
+  CGFloat interitemSpacing = _propertiesProviderFlags.minimumInteritemSpacingForElements ? [propertiesProvider galleryLayoutDelegate:self minimumInteritemSpacingForElements:elements] : 0.0;
   return [[_ASCollectionGalleryLayoutInfo alloc] initWithItemSize:itemSize
                                                minimumLineSpacing:lineSpacing
                                           minimumInteritemSpacing:interitemSpacing

examples/ASCollectionView/Sample/ViewController.m

@@ -112,7 +112,7 @@
 
 #pragma mark - ASCollectionGalleryLayoutPropertiesProviding
 
-- (CGSize)sizeForElements:(ASElementMap *)elements
+- (CGSize)galleryLayoutDelegate:(ASCollectionGalleryLayoutDelegate *)delegate sizeForElements:(ASElementMap *)elements
 {
   ASDisplayNodeAssertMainThread();
   return CGSizeMake(180, 90);