Add ::state.content.scrollTop/Left to TextEditorPresenter

spec/text-editor-presenter-spec.coffee

@@ -82,6 +82,20 @@ describe "TextEditorPresenter", ->
           editor.getBuffer().append("\n\n\n")
           expect(presenter.state.content.scrollHeight).toBe editor.getScreenLineCount() * 10
 
+      describe ".scrollTop", ->
+        it "tracks the value of ::scrollTop", ->
+          presenter = new TextEditorPresenter(model: editor, scrollTop: 10, lineHeight: 10, lineOverdrawMargin: 1)
+          expect(presenter.state.content.scrollTop).toBe 10
+          presenter.setScrollTop(50)
+          expect(presenter.state.content.scrollTop).toBe 50
+
+      describe ".scrollLeft", ->
+        it "tracks the value of ::scrollLeft", ->
+          presenter = new TextEditorPresenter(model: editor, scrollLeft: 10, lineHeight: 10, lineOverdrawMargin: 1)
+          expect(presenter.state.content.scrollLeft).toBe 10
+          presenter.setScrollLeft(50)
+          expect(presenter.state.content.scrollLeft).toBe 50
+
       describe ".indentGuidesVisible", ->
         it "is initialized based on the editor.showIndentGuide config setting", ->
           presenter = new TextEditorPresenter(model: editor)

src/text-editor-presenter.coffee

@@ -3,7 +3,7 @@
 
 module.exports =
 class TextEditorPresenter
-  constructor: ({@model, @clientHeight, @clientWidth, @scrollTop, @lineHeight, @baseCharacterWidth, @lineOverdrawMargin}) ->
+  constructor: ({@model, @clientHeight, @clientWidth, @scrollTop, @scrollLeft, @lineHeight, @baseCharacterWidth, @lineOverdrawMargin}) ->
     @disposables = new CompositeDisposable
     @charWidthsByScope = {}
     @observeModel()
@@ -44,6 +44,8 @@ class TextEditorPresenter
   updateContentState: ->
     @state.content.scrollWidth = @computeScrollWidth()
     @state.content.scrollHeight = @computeScrollHeight()
+    @state.content.scrollTop = @getScrollTop()
+    @state.content.scrollLeft = @getScrollLeft()
     @state.content.indentGuidesVisible = atom.config.get('editor.showIndentGuide', scope: @model.getRootScopeDescriptor())
 
   updateLinesState: ->
@@ -122,10 +124,16 @@ class TextEditorPresenter
     decorationClasses
 
   setScrollTop: (@scrollTop) ->
+    @updateContentState()
     @updateLinesState()
 
   getScrollTop: -> @scrollTop
 
+  setScrollLeft: (@scrollLeft) ->
+    @updateContentState()
+
+  getScrollLeft: -> @scrollLeft
+
   setClientHeight: (@clientHeight) ->
     @updateLinesState()