GH-339 Pass scroll event

SwiftNeoVim/NeoVimView.swift

@@ -1307,6 +1307,7 @@ extension NeoVimView {
     DispatchUtils.gui {
       self.grid.scroll(Int(count))
       self.setNeedsDisplay(region: self.grid.region)
+      self.delegate?.scroll()
     }
   }
 

SwiftNeoVim/NeoVimViewDelegate.swift

@@ -16,4 +16,6 @@ public protocol NeoVimViewDelegate: class {
   func currentBufferChanged(_ currentBuffer: NeoVimBuffer)
 
   func ipcBecameInvalid(reason: String)
+
+  func scroll()
 }

VimR/MainWindowComponent.swift

@@ -88,6 +88,11 @@ class MainWindowComponent: WindowComponent,
                            WorkspaceDelegate
 {
 
+  enum ScrollAction {
+
+    case scroll
+  }
+
   fileprivate static let nibName = "MainWindow"
 
   fileprivate var defaultEditorFont: NSFont
@@ -101,6 +106,8 @@ class MainWindowComponent: WindowComponent,
   fileprivate let neoVimView: NeoVimView
   fileprivate var tools = [ToolIdentifier: WorkspaceToolComponent]()
 
+  fileprivate let scrollFlow: EmbeddableComponent
+
   // MARK: - API
   var uuid: String {
     return self.neoVimView.uuid
@@ -144,6 +151,8 @@ class MainWindowComponent: WindowComponent,
     self.defaultEditorFont = initialData.appearance.editorFont
     self.fileItemService = fileItemService
 
+    self.scrollFlow = EmbeddableComponent(source: Observable.empty())
+
     super.init(source: source, nibName: MainWindowComponent.nibName)
 
     self.window.delegate = self
@@ -201,7 +210,9 @@ class MainWindowComponent: WindowComponent,
     self.tools[.bufferList] = bufferListTool
 
     let previewData = previewToolData.toolData as? PreviewComponent.PrefData ?? PreviewComponent.PrefData.default
-    let preview = PreviewComponent(source: self.sink, initialData: previewData)
+    let preview = PreviewComponent(source: self.sink,
+                                   scrollSource: self.scrollFlow.sink,
+                                   initialData: previewData)
     let previewConfig = WorkspaceTool.Config(title: "Preview",
                                              view: preview,
                                              minimumDimension: 200,
@@ -543,6 +554,10 @@ extension MainWindowComponent {
       self?.windowController.close()
     }
   }
+
+  func scroll() {
+    self.scrollFlow.publish(event: ScrollAction.scroll)
+  }
 }
 
 // MARK: - NSWindowDelegate

VimR/MarkdownRenderer.swift

@@ -131,7 +131,7 @@ class MarkdownRenderer: NSObject, Flow, PreviewRenderer {
   let toolbar: NSView? = NSView(forAutoLayout: ())
   let menuItems: [NSMenuItem]?
 
-  init(source: Observable<Any>, initialData: PrefData) {
+  init(source: Observable<Any>, scrollSource: Observable<Any>, initialData: PrefData) {
     guard let templateUrl = Bundle.main.url(forResource: "template",
                                             withExtension: "html",
                                             subdirectory: "markdown")
@@ -197,6 +197,13 @@ class MarkdownRenderer: NSObject, Flow, PreviewRenderer {
     refreshOnWriteMenuItem.target = self
     refreshOnWriteMenuItem.action = #selector(MarkdownRenderer.refreshOnWriteAction)
 
+    scrollSource
+      .filter { $0 is MainWindowComponent.ScrollAction }
+      .subscribe(onNext: { action in
+        NSLog("renderer scroll")
+      })
+      .addDisposableTo(self.flow.disposeBag)
+
     self.addReactions()
     self.userContentController.add(webviewMessageHandler, name: "com_vimr_preview_markdown")
   }

VimR/PreviewComponent.swift

@@ -135,13 +135,17 @@ class PreviewComponent: NSView, ViewComponent, ToolDataHolder {
     return self
   }
   
-  init(source: Observable<Any>, initialData: PrefData) {
+  init(source: Observable<Any>, scrollSource: Observable<Any>, initialData: PrefData) {
     self.flow = EmbeddableComponent(source: source)
 
     self.baseUrl = self.previewService.baseUrl()
     let markdownData = initialData.rendererDatas[MarkdownRenderer.identifier] as? MarkdownRenderer.PrefData ??
                        MarkdownRenderer.PrefData.default
-    self.markdownRenderer = MarkdownRenderer(source: self.flow.sink, initialData: markdownData)
+    self.markdownRenderer = MarkdownRenderer(
+      source: self.flow.sink,
+      scrollSource: scrollSource.throttle(0.5, latest: true, scheduler: MainScheduler.instance),
+      initialData: markdownData
+    )
 
     self.renderers = [
       self.markdownRenderer,