[ASDisplayNode] Pass drawParameter in rendering context callbacks (#248)

* Pass drawParameter in rendering context callbacks

* Add changelog

* Fix examples

CHANGELOG.md

@@ -12,3 +12,4 @@
 - Move more properties from ASTableView, ASCollectionView to their respective node classes. [Adlai Holler](https://github.com/Adlai-Holler)
 - Remove finalLayoutElement [Michael Schneider] (https://github.com/maicki)[#96](https://github.com/TextureGroup/Texture/pull/96)
 - Add ASPageTable - A map table for fast retrieval of objects within a certain page [Huy Nguyen](https://github.com/nguyenhuy)
+- [ASDisplayNode] Pass drawParameter in rendering context callbacks [Michael Schneider](https://github.com/maicki)[#248](https://github.com/TextureGroup/Texture/pull/248)

Source/ASDisplayNode.h

@@ -56,7 +56,7 @@ typedef void (^ASDisplayNodeDidLoadBlock)(__kindof ASDisplayNode * node);
 /**
  * ASDisplayNode will / did render node content in context.
  */
-typedef void (^ASDisplayNodeContextModifier)(CGContextRef context);
+typedef void (^ASDisplayNodeContextModifier)(CGContextRef context, id _Nullable drawParameters);
 
 /**
  * ASDisplayNode layout spec block. This block can be used instead of implementing layoutSpecThatFits: in subclass

Source/ASImageNode.mm

@@ -413,8 +413,11 @@ struct ASImageNodeDrawParameters {
     return nil;
   }
 
-  ASWeakMapEntry<UIImage *> *entry = [self.class contentsForkey:contentsKey isCancelled:(asdisplaynode_iscancelled_block_t)isCancelled];
-  if (entry == nil) {  // If nil, we were cancelled.
+  ASWeakMapEntry<UIImage *> *entry = [self.class contentsForkey:contentsKey
+                                                 drawParameters:parameter
+                                                    isCancelled:isCancelled];
+  // If nil, we were cancelled.
+  if (entry == nil) {
     return nil;
   }
   
@@ -428,7 +431,7 @@ struct ASImageNodeDrawParameters {
 static ASWeakMap<ASImageNodeContentsKey *, UIImage *> *cache = nil;
 static ASDN::Mutex cacheLock;
 
-+ (ASWeakMapEntry *)contentsForkey:(ASImageNodeContentsKey *)key isCancelled:(asdisplaynode_iscancelled_block_t)isCancelled
++ (ASWeakMapEntry *)contentsForkey:(ASImageNodeContentsKey *)key drawParameters:(id)drawParameters isCancelled:(asdisplaynode_iscancelled_block_t)isCancelled
 {
   {
     ASDN::MutexLocker l(cacheLock);
@@ -443,7 +446,7 @@ static ASDN::Mutex cacheLock;
   }
 
   // cache miss
-  UIImage *contents = [self createContentsForkey:key isCancelled:isCancelled];
+  UIImage *contents = [self createContentsForkey:key drawParameters:drawParameters isCancelled:isCancelled];
   if (contents == nil) { // If nil, we were cancelled
     return nil;
   }
@@ -454,7 +457,7 @@ static ASDN::Mutex cacheLock;
   }
 }
 
-+ (UIImage *)createContentsForkey:(ASImageNodeContentsKey *)key isCancelled:(asdisplaynode_iscancelled_block_t)isCancelled
++ (UIImage *)createContentsForkey:(ASImageNodeContentsKey *)key drawParameters:(id)drawParameters isCancelled:(asdisplaynode_iscancelled_block_t)isCancelled
 {
   // The following `UIGraphicsBeginImageContextWithOptions` call will sometimes take take longer than 5ms on an
   // A5 processor for a 400x800 backingSize.
@@ -471,7 +474,7 @@ static ASDN::Mutex cacheLock;
   
   CGContextRef context = UIGraphicsGetCurrentContext();
   if (context && key.willDisplayNodeContentWithRenderingContext) {
-    key.willDisplayNodeContentWithRenderingContext(context);
+    key.willDisplayNodeContentWithRenderingContext(context, drawParameters);
     contextIsClean = NO;
   }
   
@@ -503,7 +506,7 @@ static ASDN::Mutex cacheLock;
   }
   
   if (context && key.didDisplayNodeContentWithRenderingContext) {
-    key.didDisplayNodeContentWithRenderingContext(context);
+    key.didDisplayNodeContentWithRenderingContext(context, drawParameters);
   }
 
   // The following `UIGraphicsGetImageFromCurrentImageContext` call will commonly take more than 20ms on an
@@ -517,7 +520,7 @@ static ASDN::Mutex cacheLock;
   
   UIGraphicsEndImageContext();
   
-  if (key.imageModificationBlock != NULL) {
+  if (key.imageModificationBlock) {
     result = key.imageModificationBlock(result);
   }
   

Source/Private/ASDisplayNode+AsyncDisplay.mm

@@ -251,7 +251,7 @@
       // For -display methods, we don't have a context, and thus will not call the _willDisplayNodeContentWithRenderingContext or
       // _didDisplayNodeContentWithRenderingContext blocks. It's up to the implementation of -display... to do what it needs.
       if (willDisplayNodeContentWithRenderingContext != nil) {
-        willDisplayNodeContentWithRenderingContext(currentContext);
+        willDisplayNodeContentWithRenderingContext(currentContext, drawParameters);
       }
       
       // Decide if we use a class or instance method to draw or display.
@@ -266,7 +266,7 @@
       }
       
       if (didDisplayNodeContentWithRenderingContext != nil) {
-        didDisplayNodeContentWithRenderingContext(currentContext);
+        didDisplayNodeContentWithRenderingContext(currentContext, drawParameters);
       }
       
       if (shouldCreateGraphicsContext) {

examples/LayoutSpecExamples-Swift/Sample/LayoutExampleNode.swift

@@ -74,7 +74,7 @@ class PhotoWithInsetTextOverlay : LayoutExampleNode {
     backgroundColor = .clear
 
     photoNode.url = URL(string: "http://asyncdisplaykit.org/static/images/layout-examples-photo-with-inset-text-overlay-photo.png")
-    photoNode.willDisplayNodeContentWithRenderingContext = { context in
+    photoNode.willDisplayNodeContentWithRenderingContext = { context, drawParameters in
       let bounds = context.boundingBoxOfClipPath
       UIBezierPath(roundedRect: bounds, cornerRadius: 10).addClip()
     }

examples/LayoutSpecExamples/Sample/LayoutExampleNodes.m

@@ -125,7 +125,7 @@
     
     _photoNode = [[ASNetworkImageNode alloc] init];
     _photoNode.URL = [NSURL URLWithString:@"http://asyncdisplaykit.org/static/images/layout-examples-photo-with-inset-text-overlay-photo.png"];
-    _photoNode.willDisplayNodeContentWithRenderingContext = ^(CGContextRef context) {
+    _photoNode.willDisplayNodeContentWithRenderingContext = ^(CGContextRef context, id drawParameters) {
       CGRect bounds = CGContextGetClipBoundingBox(context);
       [[UIBezierPath bezierPathWithRoundedRect:bounds cornerRadius:10] addClip];
     };