merge

MVMCoreUI.xcodeproj/project.pbxproj

@@ -347,6 +347,8 @@
 		D23EA800247EBD6C00D60C34 /* LabelBarButtonItem.swift in Sources */ = {isa = PBXBuildFile; fileRef = D23EA7FF247EBD6C00D60C34 /* LabelBarButtonItem.swift */; };
 		D23EA802247EBED400D60C34 /* ImageBarButtonItem.swift in Sources */ = {isa = PBXBuildFile; fileRef = D23EA801247EBED400D60C34 /* ImageBarButtonItem.swift */; };
 		D243859923A16B1800332775 /* Container.swift in Sources */ = {isa = PBXBuildFile; fileRef = D243859823A16B1800332775 /* Container.swift */; };
+		D24918F625D5AD8E00CAB4B1 /* PageVisibilityClosureBehavior.swift in Sources */ = {isa = PBXBuildFile; fileRef = D24918F525D5AD8E00CAB4B1 /* PageVisibilityClosureBehavior.swift */; };
+		D24918FA25D5ADBB00CAB4B1 /* PageScrolledClosureBehavior.swift in Sources */ = {isa = PBXBuildFile; fileRef = D24918F925D5ADBA00CAB4B1 /* PageScrolledClosureBehavior.swift */; };
 		D2509ED12472ED9B001BFB9D /* NavigationItemModelProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = D2509ED02472ED9B001BFB9D /* NavigationItemModelProtocol.swift */; };
 		D2509ED62472EE2F001BFB9D /* NavigationImageButtonModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = D2509ED52472EE2F001BFB9D /* NavigationImageButtonModel.swift */; };
 		D253BB8A24574CC5002DE544 /* StackModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = D260106423D0CEA700764D80 /* StackModel.swift */; };
@@ -408,7 +410,6 @@
 		D29C559025C095210082E7D6 /* Video.swift in Sources */ = {isa = PBXBuildFile; fileRef = D29C558F25C095210082E7D6 /* Video.swift */; };
 		D29C559325C0992D0082E7D6 /* VideoModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = D29C559225C0992D0082E7D6 /* VideoModel.swift */; };
 		D29C559625C099630082E7D6 /* VideoDataManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = D29C559525C099630082E7D6 /* VideoDataManager.swift */; };
-		D29C559C25C20D6D0082E7D6 /* VideoPauseBehavior.swift in Sources */ = {isa = PBXBuildFile; fileRef = D29C559B25C20D6D0082E7D6 /* VideoPauseBehavior.swift */; };
 		D29C94D5242901C9003813BA /* MVMCoreUICommonViewsUtility+Extension.swift in Sources */ = {isa = PBXBuildFile; fileRef = D29C94D4242901C9003813BA /* MVMCoreUICommonViewsUtility+Extension.swift */; };
 		D29DF0D121E404D4003B2FB9 /* MVMCoreUI.h in Headers */ = {isa = PBXBuildFile; fileRef = D29DF0CF21E404D4003B2FB9 /* MVMCoreUI.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		D29DF0E621E4F3C7003B2FB9 /* MVMCore.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = D29DF0E521E4F3C7003B2FB9 /* MVMCore.framework */; };
@@ -898,6 +899,8 @@
 		D23EA7FF247EBD6C00D60C34 /* LabelBarButtonItem.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LabelBarButtonItem.swift; sourceTree = "<group>"; };
 		D23EA801247EBED400D60C34 /* ImageBarButtonItem.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ImageBarButtonItem.swift; sourceTree = "<group>"; };
 		D243859823A16B1800332775 /* Container.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Container.swift; sourceTree = "<group>"; };
+		D24918F525D5AD8E00CAB4B1 /* PageVisibilityClosureBehavior.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PageVisibilityClosureBehavior.swift; sourceTree = "<group>"; };
+		D24918F925D5ADBA00CAB4B1 /* PageScrolledClosureBehavior.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PageScrolledClosureBehavior.swift; sourceTree = "<group>"; };
 		D2509ED02472ED9B001BFB9D /* NavigationItemModelProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NavigationItemModelProtocol.swift; sourceTree = "<group>"; };
 		D2509ED52472EE2F001BFB9D /* NavigationImageButtonModel.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = NavigationImageButtonModel.swift; sourceTree = "<group>"; };
 		D253BB9B245874F8002DE544 /* BGImageMolecule.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BGImageMolecule.swift; sourceTree = "<group>"; };
@@ -957,7 +960,6 @@
 		D29C558F25C095210082E7D6 /* Video.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Video.swift; sourceTree = "<group>"; };
 		D29C559225C0992D0082E7D6 /* VideoModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = VideoModel.swift; sourceTree = "<group>"; };
 		D29C559525C099630082E7D6 /* VideoDataManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = VideoDataManager.swift; sourceTree = "<group>"; };
-		D29C559B25C20D6D0082E7D6 /* VideoPauseBehavior.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = VideoPauseBehavior.swift; sourceTree = "<group>"; };
 		D29C94D4242901C9003813BA /* MVMCoreUICommonViewsUtility+Extension.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "MVMCoreUICommonViewsUtility+Extension.swift"; sourceTree = "<group>"; };
 		D29DF0CC21E404D4003B2FB9 /* MVMCoreUI.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = MVMCoreUI.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		D29DF0CF21E404D4003B2FB9 /* MVMCoreUI.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MVMCoreUI.h; sourceTree = "<group>"; };
@@ -1240,6 +1242,8 @@
 			children = (
 				27F973522466074500CAB5C5 /* PageBehavior.swift */,
 				27F97369246750BE00CAB5C5 /* ScreenBrightnessModifierBehavior.swift */,
+				D24918F525D5AD8E00CAB4B1 /* PageVisibilityClosureBehavior.swift */,
+				D24918F925D5ADBA00CAB4B1 /* PageScrolledClosureBehavior.swift */,
 			);
 			path = Behaviors;
 			sourceTree = "<group>";
@@ -2038,7 +2042,6 @@
 				AA07EA902510A442009A2AE3 /* StarModel.swift */,
 				AA07EA922510A451009A2AE3 /* Star.swift */,
 				D29C559525C099630082E7D6 /* VideoDataManager.swift */,
-				D29C559B25C20D6D0082E7D6 /* VideoPauseBehavior.swift */,
 				D29C559225C0992D0082E7D6 /* VideoModel.swift */,
 				D29C558F25C095210082E7D6 /* Video.swift */,
 			);
@@ -2672,7 +2675,6 @@
 				0A7EF85D23D8A95600B2AAD1 /* TextEntryFieldModel.swift in Sources */,
 				BB54C5212434D92F0038326C /* ListRightVariableButtonAllTextAndLinksModel.swift in Sources */,
 				D2092349244A51D40044AD09 /* RadioSwatchModel.swift in Sources */,
-				D29C559C25C20D6D0082E7D6 /* VideoPauseBehavior.swift in Sources */,
 				0A775F2824893937009EFB58 /* ThreeHeadlineBodyLinkModel.swift in Sources */,
 				8DD1E370243B3D0500D8F2DF /* ListThreeColumnInternationalData.swift in Sources */,
 				D2EC7BDD2527B83700F540AF /* SectionHeaderFooterView.swift in Sources */,
@@ -2707,6 +2709,7 @@
 				94C2D9A523872C350006CF46 /* LabelAttributeFontModel.swift in Sources */,
 				011D958724042492000E3791 /* FormFieldProtocol.swift in Sources */,
 				011D95AF2407266E000E3791 /* RadioButtonModel.swift in Sources */,
+				D24918F625D5AD8E00CAB4B1 /* PageVisibilityClosureBehavior.swift in Sources */,
 				D20492A624329CE200A5EED6 /* LoadImageView.swift in Sources */,
 				017BEB7F23676E870024EF95 /* MoleculeObjectMapping.swift in Sources */,
 				D274CA332236A78900B01B62 /* FooterView.swift in Sources */,
@@ -2792,6 +2795,7 @@
 				012A88DB238ED45900FE3DA1 /* CarouselModel.swift in Sources */,
 				D2092355244FA0FD0044AD09 /* ThreeLayerTemplateModelProtocol.swift in Sources */,
 				0AE14F64238315D2005417F8 /* TextField.swift in Sources */,
+				D24918FA25D5ADBB00CAB4B1 /* PageScrolledClosureBehavior.swift in Sources */,
 				0A51F3E22475CB73002E08B6 /* LoadingSpinnerModel.swift in Sources */,
 				D2169303251E53D9002A6324 /* SectionListTemplateModel.swift in Sources */,
 				0AB764D124460F6300E7FE72 /* UIDatePicker+Extension.swift in Sources */,

MVMCoreUI/Atomic/Atoms/Views/Video.swift

@@ -10,18 +10,9 @@ import AVKit
 open class Video: View {
     public let videoViewController = AVPlayerViewController()
     
-    // TODO: reuse.
-    private let videoQueue = DispatchQueue(label: "serial.video.queue")
-    
     /// Used to track the state and respond..
     private var stateKVOToken: NSKeyValueObservation?
 
-    private weak var pauseBehavior: BlockPageVisibilityBehavior?
-
-    private weak var scrollBehavior: BlockPageScrolledBehavior?
-    
-    private var visible = true
-
     open override func setupView() {
         super.setupView()
         videoViewController.view.translatesAutoresizingMaskIntoConstraints = false
@@ -33,6 +24,10 @@ open class Video: View {
     open override func set(with model: MoleculeModelProtocol, _ delegateObject: MVMCoreUIDelegateObject?, _ additionalData: [AnyHashable: Any]?) {
         super.set(with: model, delegateObject, additionalData)
         guard let model = model as? VideoModel else { return }
+        if let controller = delegateObject?.moleculeDelegate as? UIViewController {
+            controller.addChild(videoViewController)
+            videoViewController.didMove(toParent: controller)
+        }
         videoViewController.showsPlaybackControls = model.showControls
         videoViewController.player = model.videoDataManager.player
         addStateObserver()
@@ -54,8 +49,8 @@ open class Video: View {
         }
         
         // Handle pause behavior
-        addVisibleBehavoir(to: model, delegateObject: delegateObject)
+        model.addVisibleBehavior(for: self, delegateObject: delegateObject)
-        addScrolledBehavoir(to: model, delegateObject: delegateObject)
+        model.addScrollBehavior(for: self, delegateObject: delegateObject)
     }
     
     /// Listens and responds to video loading state changes.
@@ -101,62 +96,4 @@ open class Video: View {
     deinit {
         removeStateObserver()
     }
-    
-    /// Adds a behavoir to pause the video on page hidden behavoir and unpause if necessary on page shown.
-    open func addVisibleBehavoir(to model: VideoModel, delegateObject: MVMCoreUIDelegateObject?) {
-        let onShow = { [weak self] in
-            guard self?.visible == true,
-                let model = self?.model as? VideoModel,
-                model.autoPlay else { return }
-            model.videoDataManager.player?.play()
-        }
-        let onHide: () -> Void = { [weak self] in
-            guard self?.visible == true,
-                  let model = self?.model as? VideoModel else { return }
-            model.videoDataManager.player?.pause()
-        }
-        
-        if pauseBehavior != nil {
-            pauseBehavior?.pageShownHandler = onShow
-            pauseBehavior?.pageHiddenHandler = onHide
-        } else {
-            guard let delegate = delegateObject?.moleculeDelegate,
-                  let page = delegate as? PageProtocol,
-                  var pageModel = page.pageModel as? PageBehaviorsTemplateProtocol else { return }
-            var behavoirs = pageModel.behaviors ?? []
-            let pauseBehavior = BlockPageVisibilityBehavior(with: onShow, onPageHiddenHandler: onHide)
-            behavoirs.append(pauseBehavior)
-            pageModel.behaviors = behavoirs
-            self.pauseBehavior = pauseBehavior
-        }
-    }
-    
-    open func addScrolledBehavoir(to model: VideoModel, delegateObject: MVMCoreUIDelegateObject?) {
-        
-        let onScroll = { [weak self] (scrollView: UIScrollView) in
-            // If visible to not visible, pause video.
-            // If not visible to visible, unpause if needed, add visible behavior
-            // visible ==
-//            if !visible {
-//                pause
-//            } else {
-//              let model = self?.model as? VideoModel,
-//              model.autoPlay else { return }
-//              model.videoDataManager.player?.play()
-//            }
-        }
-        
-        if scrollBehavior != nil {
-            scrollBehavior?.pageScrolledHandler = onScroll
-        } else {
-            guard let delegate = delegateObject?.moleculeDelegate,
-               let page = delegate as? PageProtocol,
-               var pageModel = page.pageModel as? PageBehaviorsTemplateProtocol else { return }
-            var behavoirs = pageModel.behaviors ?? []
-            let scrollBehavior = BlockPageScrolledBehavior(with: onScroll)
-            behavoirs.append(scrollBehavior)
-            pageModel.behaviors = behavoirs
-            self.scrollBehavior = scrollBehavior
-        }
-    }
 }

MVMCoreUI/Atomic/Atoms/Views/VideoDataManager.swift

@@ -7,9 +7,11 @@
 //
 
 import Foundation
+import AVFoundation
 
 @objcMembers open class VideoDataManager: NSObject {
     
+    /// The state of the video.
     @objc public enum State: Int {
         case none
         case loading
@@ -22,7 +24,7 @@ import Foundation
     
     // Thread Safe video state handling.
     private var _videoState = State.none
-    private let videoStatueQueue = DispatchQueue(label: "concurrent.video.state.queue", attributes: .concurrent)
+    private let videoStatueQueue = DispatchQueue(label: "com.vzw.mvmcoreui.videoDataManager.state", attributes: .concurrent)
 
     /// The state of the video. Use KVO to listen for state changes.
     @objc public var videoState: State {
@@ -47,8 +49,12 @@ import Foundation
     
     private var kvoToken: NSKeyValueObservation?
     
+    private var memoryWarningListener: Any?
+    
     public init(with videoURLString: String) {
         self.videoURLString = videoURLString
+        super.init()
+        self.addMemoryWarningListener()
     }
     
     public func loadVideo() {
@@ -114,7 +120,22 @@ import Foundation
         kvoToken = nil
     }
     
+    private func addMemoryWarningListener() {
+        memoryWarningListener = NotificationCenter.default.addObserver(forName: UIApplication.didReceiveMemoryWarningNotification, object: nil, queue: OperationQueue.main) { [weak self] (notification) in
+            self?.removeVideoObserver()
+            self?.player = nil
+            self?.videoState = .none
+        }
+    }
+    
+    private func removeMemoryWarningListener() {
+        guard let observer = memoryWarningListener else { return }
+        NotificationCenter.default.removeObserver(observer)
+        memoryWarningListener = nil
+    }
+    
     deinit {
         removeVideoObserver()
+        removeMemoryWarningListener()
     }
 }

MVMCoreUI/Atomic/Atoms/Views/VideoModel.swift

@@ -16,9 +16,15 @@ open class VideoModel: MoleculeModelProtocol {
     public var autoPlay = true
     public var alwaysReset = false
 
+    /// When the video is halted because it is no longer visible
+    private var halted = false
+        
     /// Keeps a reference to the video data.
     public var videoDataManager: VideoDataManager
     
+    private weak var visibleBehavior: PageVisibilityClosureBehavior?
+    private weak var scrollBehavior: PageScrolledClosureBehavior?
+
     private enum CodingKeys: String, CodingKey {
         case moleculeName
         case video
@@ -35,7 +41,6 @@ open class VideoModel: MoleculeModelProtocol {
     required public init(from decoder: Decoder) throws {
         let typeContainer = try decoder.container(keyedBy: CodingKeys.self)
         video = try typeContainer.decode(String.self, forKey:.video)
-        videoDataManager = VideoDataManager(with: video)
         if let showControls = try typeContainer.decodeIfPresent(Bool.self, forKey: .showControls) {
             self.showControls = showControls
         }
@@ -45,6 +50,7 @@ open class VideoModel: MoleculeModelProtocol {
         if let alwaysReset = try typeContainer.decodeIfPresent(Bool.self, forKey: .alwaysReset) {
             self.alwaysReset = alwaysReset
         }
+        videoDataManager = VideoDataManager(with: video)
     }
 
     open func encode(to encoder: Encoder) throws {
@@ -55,4 +61,76 @@ open class VideoModel: MoleculeModelProtocol {
         try container.encode(autoPlay, forKey: .autoPlay)
         try container.encode(alwaysReset, forKey: .alwaysReset)
     }
+    
+    private func haltVideo() {
+        guard !halted else { return }
+        halted = true
+        print("halted \(video)")
+        videoDataManager.player?.pause()
+    }
+    
+    private func unhaltVideo() {
+        guard halted else { return }
+        halted = false
+        print("unhalted \(video)")
+        guard videoDataManager.videoState == .loaded else { return }
+        if alwaysReset {
+            // Always start video at the beginning.
+            videoDataManager.player?.seek(to: .zero)
+        }
+        if autoPlay {
+            videoDataManager.player?.play()
+        }
+    }
+    
+    /// Adds a behavior to pause the video on page hidden behavior and unpause if necessary on page shown.
+    open func addVisibleBehavior(for view: Video, delegateObject: MVMCoreUIDelegateObject?) {
+        let onShow = { [weak self] in
+            guard let self = self,
+                  let containingView = (delegateObject?.moleculeDelegate as? UIViewController)?.view,
+                  MVMCoreUIUtility.isView(view, visibleIn: containingView) else { return }
+            self.unhaltVideo()
+        }
+        let onHide: () -> Void = { [weak self] in
+            guard let self = self else { return }
+            self.haltVideo()
+        }
+        
+        guard visibleBehavior == nil else {
+            visibleBehavior?.pageShownHandler = onShow
+            visibleBehavior?.pageHiddenHandler = onHide
+            return
+        }
+
+        guard var delegate = delegateObject?.behaviorTemplateDelegate else { return }
+        let pauseBehavior = PageVisibilityClosureBehavior(with: onShow, onPageHiddenHandler: onHide)
+        delegate.add(behavior: pauseBehavior)
+        self.visibleBehavior = pauseBehavior
+    }
+    
+    /// Adds a behavior to pause the video if scrolled off of the page and unpause if necessary if scrolled on.
+    open func addScrollBehavior(for view: Video, delegateObject: MVMCoreUIDelegateObject?) {
+
+        let onScroll = { [weak self] (scrollView: UIScrollView) in
+            // If visible to not visible, pause video.
+            // If not visible to visible, unpause if needed, add visible behavior
+            guard let self = self,
+                  let containingView = (delegateObject?.moleculeDelegate as? UIViewController)?.view else { return }
+            if !MVMCoreUIUtility.isView(view, visibleIn: containingView) {
+                self.haltVideo()
+            } else {
+                self.unhaltVideo()
+            }
+        }
+        
+        guard scrollBehavior == nil else {
+            scrollBehavior?.pageScrolledHandler = onScroll
+            return
+        }
+
+        guard var delegate = delegateObject?.behaviorTemplateDelegate else { return }
+        let scrollBehavior = PageScrolledClosureBehavior(with: onScroll)
+        delegate.add(behavior: scrollBehavior)
+        self.scrollBehavior = scrollBehavior
+    }
 }

MVMCoreUI/Atomic/Atoms/Views/VideoPauseBehavior.swift

@@ -1,110 +0,0 @@
-//
-//  VideoPauseBehavior.swift
-//  MVMCoreUI
-//
-//  Created by Scott Pfeil on 1/27/21.
-//  Copyright © 2021 Verizon Wireless. All rights reserved.
-//
-
-import Foundation
-
-public class BlockPageVisibilityBehavior: PageVisibilityBehavior {
-    
-    public static var identifier = "blockPageVisibilityBehavior"
-    
-    public var pageShownHandler: () -> Void
-    public var pageHiddenHandler: () -> Void
-
-    public init(with onPageShownHandler: @escaping () -> Void, onPageHiddenHandler: @escaping () -> Void) {
-        self.pageShownHandler = onPageShownHandler
-        self.pageHiddenHandler = onPageHiddenHandler
-    }
-    
-    private enum CodingKeys: String, CodingKey {
-        case behaviorName
-    }
-    
-    // This class is not meant to be decoded and encoded really.
-    public required init(from decoder: Decoder) throws {
-        pageShownHandler = {}
-        pageHiddenHandler = {}
-    }
-    
-    public func encode(to encoder: Encoder) throws {
-        var container = encoder.container(keyedBy: CodingKeys.self)
-        try container.encode(behaviorName, forKey: .behaviorName)
-    }
-            
-    //MARK:- PageVisibilityBehavior
-    public func onPageShown() {
-        pageShownHandler()
-    }
-    
-    public func onPageHidden() {
-        pageHiddenHandler()
-    }
-}
-
-public class BlockPageScrolledBehavior: PageScrolledBehavior {
-    
-    public static var identifier = "blockPageScrolledBehavior"
-    
-    public var pageScrolledHandler: (_ scrollView: UIScrollView) -> Void
-
-    public init(with onPageScrolledHandler: @escaping (_ scrollView: UIScrollView) -> Void) {
-        self.pageScrolledHandler = onPageScrolledHandler
-    }
-    
-    private enum CodingKeys: String, CodingKey {
-        case behaviorName
-    }
-    
-    // This class is not meant to be decoded and encoded really.
-    public required init(from decoder: Decoder) throws {
-        pageScrolledHandler = { (scrollView) in }
-    }
-    
-    public func encode(to encoder: Encoder) throws {
-        var container = encoder.container(keyedBy: CodingKeys.self)
-        try container.encode(behaviorName, forKey: .behaviorName)
-    }
-            
-    public func pageScrolled(scrollView: UIScrollView) {
-        pageScrolledHandler(scrollView)
-    }
-}
-
-
-public class VideoPauseBehavior: PageVisibilityBehavior {
-    
-    public static var identifier = "videoPause"
-    
-    public weak var videoModel: VideoModel?
-    public init(with videoModel: VideoModel) {
-        self.videoModel = videoModel
-    }
-    
-    private enum CodingKeys: String, CodingKey {
-        case behaviorName
-    }
-            
-    //MARK:- PageVisibilityBehavior
-    
-    public func onPageShown() {
-        // TODO: Only do this if attached to a visible view...
-        if videoModel?.autoPlay == true {
-            videoModel?.videoDataManager.player?.play()
-        }
-    }
-    
-    public func onPageHidden() {
-        videoModel?.videoDataManager.player?.pause()
-    }
-    
-    public required init(from decoder: Decoder) throws {}
-    
-    public func encode(to encoder: Encoder) throws {
-        var container = encoder.container(keyedBy: CodingKeys.self)
-        try container.encode(behaviorName, forKey: .behaviorName)
-    }
-}

MVMCoreUI/Atomic/Molecules/OtherContainers/BGImageMoleculeModel.swift

@@ -27,6 +27,12 @@ open class BGImageMoleculeModel: MoleculeContainerModel {
         if bottomPadding == nil {
             bottomPadding = PaddingDefaultVerticalSpacing3
         }
+        if image.contentMode == nil {
+            image.contentMode = .scaleAspectFill
+        }
+        if image.imageFormat == nil {
+            image.imageFormat = "jpg"
+        }
     }
 
     private enum CodingKeys: String, CodingKey {

MVMCoreUI/Behaviors/PageBehavior.swift

@@ -43,4 +43,21 @@ public protocol PageScrolledBehavior: PageBehaviorProtocol {
 public protocol PageBehaviorsTemplateProtocol {
     
     var behaviors: [PageBehaviorProtocol]? { get set }
+
+}
+
+public extension PageBehaviorsTemplateProtocol {
+    mutating func add(behavior: PageBehaviorProtocol) {
+        var newBehaviors = behaviors ?? []
+        newBehaviors.append(behavior)
+        self.behaviors = newBehaviors
+    }
+}
+
+public extension MVMCoreUIDelegateObject {
+    weak var behaviorTemplateDelegate: (PageBehaviorsTemplateProtocol & NSObjectProtocol)? {
+        get {
+            return (moleculeDelegate as? PageProtocol)?.pageModel as? (PageBehaviorsTemplateProtocol & NSObjectProtocol)
+        }
+    }
 }

MVMCoreUI/Behaviors/PageScrolledClosureBehavior.swift

@@ -0,0 +1,33 @@
+//
+//  PageScrolledClosureBehavior.swift
+//  MVMCoreUI
+//
+//  Created by Scott Pfeil on 2/11/21.
+//  Copyright © 2021 Verizon Wireless. All rights reserved.
+//
+
+import Foundation
+
+public class PageScrolledClosureBehavior: PageScrolledBehavior {
+    
+    public static var identifier = "pageScrolledClosureBehavior"
+    
+    public var pageScrolledHandler: (_ scrollView: UIScrollView) -> Void
+
+    public init(with onPageScrolledHandler: @escaping (_ scrollView: UIScrollView) -> Void) {
+        self.pageScrolledHandler = onPageScrolledHandler
+    }
+    
+    // This class is not meant to be decoded and encoded really.
+    public required init(from decoder: Decoder) throws {
+        throw ModelRegistry.Error.decoderOther(message: "PageScrolledClosureBehavior does not decode.")
+    }
+    
+    public func encode(to encoder: Encoder) throws {
+        throw ModelRegistry.Error.decoderOther(message: "PageScrolledClosureBehavior does not encode.")
+    }
+    
+    public func pageScrolled(scrollView: UIScrollView) {
+        pageScrolledHandler(scrollView)
+    }
+}

MVMCoreUI/Behaviors/PageVisibilityClosureBehavior.swift

@@ -0,0 +1,40 @@
+//
+//  PageVisibilityClosureBehavior.swift
+//  MVMCoreUI
+//
+//  Created by Scott Pfeil on 2/11/21.
+//  Copyright © 2021 Verizon Wireless. All rights reserved.
+//
+
+import Foundation
+
+public class PageVisibilityClosureBehavior: PageVisibilityBehavior {
+    
+    public static var identifier = "pageVisibilityClosureBehavior"
+    
+    public var pageShownHandler: () -> Void
+    public var pageHiddenHandler: () -> Void
+
+    public init(with onPageShownHandler: @escaping () -> Void, onPageHiddenHandler: @escaping () -> Void) {
+        self.pageShownHandler = onPageShownHandler
+        self.pageHiddenHandler = onPageHiddenHandler
+    }
+    
+    // This class is not meant to be decoded and encoded really.
+    public required init(from decoder: Decoder) throws {
+        throw ModelRegistry.Error.decoderOther(message: "PageVisibilityClosureBehavior does not decode.")
+    }
+    
+    public func encode(to encoder: Encoder) throws {
+        throw ModelRegistry.Error.decoderOther(message: "PageVisibilityClosureBehavior does not encode.")
+    }
+            
+    //MARK:- PageVisibilityBehavior
+    public func onPageShown() {
+        pageShownHandler()
+    }
+    
+    public func onPageHidden() {
+        pageHiddenHandler()
+    }
+}

MVMCoreUI/OtherHandlers/CoreUIObject.swift

@@ -13,6 +13,7 @@ import UIKit
     public var globalTopAlertDelegate: MVMCoreGlobalTopAlertDelegateProtocol?
 
     open override func defaultInitialSetup() {
+        loadHandler = MVMCoreLoadHandler()
         cache = MVMCoreCache()
         sessionHandler = MVMCoreSessionTimeHandler()
         actionHandler = MVMCoreActionHandler()
@@ -21,5 +22,6 @@ import UIKit
         loggingDelegate = MVMCoreUILoggingHandler()
         moleculeMap = MoleculeObjectMapping()
         MoleculeObjectMapping.registerObjects()
+        clientParameterRegistry = ClientParameterRegistry()
     }
 }

MVMCoreUI/Utility/MVMCoreUIUtility.h

@@ -37,6 +37,14 @@ NS_ASSUME_NONNULL_BEGIN
 /// Checks if the view or any descendents of the view is currently focused for voice over.
 + (BOOL)viewContainsAccessiblityFocus:(nonnull UIView *)view;
 
++ (BOOL)isView:(nonnull UIView *)view visibleIn:(nonnull UIView *)rootView;
+
++ (BOOL)isViewVisibleInParent:(nonnull UIView *)view;
+
++ (BOOL)doesView:(nonnull UIView *)overlappingView cover:(nonnull UIView *)view;
+
++ (BOOL)isViewTransparent:(nonnull UIView *)view;
+
 #pragma mark - Setters
 
 + (void)setMarginsForView:(nullable UIView *)view leading:(CGFloat)leading top:(CGFloat)top trailing:(CGFloat)trailing bottom:(CGFloat)bottom;

MVMCoreUI/Utility/MVMCoreUIUtility.m

@@ -96,6 +96,51 @@
     return containsFocus;
 }
 
++ (BOOL)isView:(nonnull UIView *)view visibleIn:(nonnull UIView *)rootView {
+    return [view isDescendantOfView:rootView] && [self isViewVisibleInParent:view];
+}
+
+// Climb up the tree. Break early.
++ (BOOL)isViewVisibleInParent:(nonnull UIView *)view {
+    UIView *superview = view.superview;
+    UIView *ancestor = view;
+    // Begin climbing its ancestor views, checking if it remains visible in *each* of their bounds and if the children at views closer to the front block the visibility of this view.
+    while (superview) {
+        if (superview.clipsToBounds && !CGRectIntersectsRect(superview.bounds, [view convertRect:view.bounds toView:superview])) {
+            return false;
+        } else {
+            // Check the superview's children up to the common ancestor. (Reworking the ancestor would put us in an infinite loop and we want to ignore the children with a lower z-order.)
+            for (UIView *subview in [superview.subviews reverseObjectEnumerator]) {
+                if (subview == ancestor) {
+                    break;
+                } else if ([self doesView:subview cover:view]) {
+                    return false;
+                }
+            }
+        }
+        ancestor = superview;
+        superview = superview.superview;
+    }
+    return true;
+}
+
+// Climb down the tree.
++ (BOOL)doesView:(nonnull UIView *)overlappingView cover:(nonnull UIView *)view {
+    if (![self isViewTransparent:overlappingView] && CGRectContainsRect(overlappingView.bounds, [view convertRect:view.bounds toView:overlappingView])) {
+        return true;
+    }
+    for (UIView *subview in overlappingView.subviews) {
+        if ([self doesView:subview cover:view]) {
+            return true;
+        }
+    }
+    return false;
+}
+
++ (BOOL)isViewTransparent:(nonnull UIView *)view {
+    return view.alpha < 1 || view.backgroundColor == nil || CGColorGetAlpha(view.backgroundColor.CGColor) < 1;
+}
+
 #pragma mark - Setters
 
 + (void)setMarginsForView:(nullable UIView *)view leading:(CGFloat)leading top:(CGFloat)top trailing:(CGFloat)trailing bottom:(CGFloat)bottom {