Improved thumbnails for special events and get-togethers

WWDC/Assets.xcassets/get-together.imageset/Contents.json

@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "get-together.pdf"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

WWDC/Assets.xcassets/special.imageset/Contents.json

@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "special.pdf"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

WWDC/SessionTableCellView.swift

@@ -100,6 +100,17 @@ final class SessionTableCellView: NSTableCellView {
                 self?.contextColorView.progress = 0
             }
         }).addDisposableTo(self.disposeBag)
+        
+        viewModel.rxSessionType.distinctUntilChanged().subscribe(onNext: { [weak self] type in
+            guard type != .session && type != .lab else { return }
+            
+            switch type {
+            case .getTogether:
+                self?.thumbnailImageView.image = #imageLiteral(resourceName: "get-together")
+            default:
+                self?.thumbnailImageView.image = #imageLiteral(resourceName: "special")
+            }
+        }).addDisposableTo(self.disposeBag)
     }
     
     private lazy var titleLabel: NSTextField = {

WWDC/SessionViewModel.swift

@@ -61,6 +61,10 @@ final class SessionViewModel: NSObject {
         return Observable.from(object: self.session).map({ SessionViewModel.footer(for: $0, at: $0.event.first) })
     }()
     
+    lazy var rxSessionType: Observable<SessionInstanceType> = {
+        return Observable.from(object: self.session).map({ $0.instances.first?.type }).ignoreNil()
+    }()
+    
     lazy var rxColor: Observable<NSColor> = {
         return Observable.from(object: self.session).map({ SessionViewModel.trackColor(for: $0) }).ignoreNil()
     }()
@@ -222,6 +226,10 @@ final class SessionViewModel: NSObject {
     }
     
     static func imageUrl(for session: Session) -> URL? {
+        guard session.instances.first?.type == .session || session.instances.first?.type == .lab else {
+            return nil
+        }
+        
         let imageAsset = session.asset(of: .image)
         
         guard let thumbnail = imageAsset?.remoteURL, let thumbnailUrl = URL(string: thumbnail) else { return nil }