* Rewrote the way BViewState checks if changes needs to be saved on quiting a navigation window (icon mode and

list mode) or switching dir in single window navigation. Fixes the other half of the problem in #2441. Left some 
todos.
  I discovered an other bug that can add a random offset after finishing adding poses.  


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28205 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/tracker/PoseView.cpp

@@ -609,11 +609,6 @@ BPoseView::SaveState(AttributeStreamNode *node)
 	// save view state into object
 	BMallocIO stream;
 
-	if (ViewMode() == kListMode)
-		fViewState->SetListOrigin(LeftTop());
-	else
-		fViewState->SetIconOrigin(LeftTop());
-
 	stream.Seek(0, SEEK_SET);
 	fViewState->ArchiveToStream(&stream);
 
@@ -631,7 +626,6 @@ BPoseView::SaveState(AttributeStreamNode *node)
 		stream.Position(), stream.Buffer());
 
 	fStateNeedsSaving = false;	
-	fViewState->MarkSaved();
 }
 
 
@@ -639,12 +633,6 @@ void
 BPoseView::SaveState(BMessage &message) const
 {
 	SaveColumnState(message);
-
-	if (ViewMode() == kListMode)
-		fViewState->SetListOrigin(LeftTop());
-	else
-		fViewState->SetIconOrigin(LeftTop());
-
 	fViewState->ArchiveToMessage(message);
 }
 
@@ -859,6 +847,19 @@ BPoseView::MoveBy(float x, float y)
 }
 
 
+void
+BPoseView::ScrollTo(BPoint point)
+{
+	_inherited::ScrollTo(point);
+		
+	//keep the view state in sync.
+	if (ViewMode() == kListMode)
+		fViewState->SetListOrigin(LeftTop());
+	else
+		fViewState->SetIconOrigin(LeftTop());
+}
+
+
 void
 BPoseView::AttachedToWindow()
 {
@@ -1504,7 +1505,7 @@ BPoseView::AddPosesCompleted()
 		BRect bounds(Bounds());
 		float lastItemTop = (fPoseList->CountItems() - 1) * fListElemHeight;
 		if (bounds.top > lastItemTop)
-			ScrollTo(bounds.left, max_c(lastItemTop, 0));
+			BView::ScrollTo(bounds.left, max_c(lastItemTop, 0));
 	}
 }
 
@@ -1998,6 +1999,7 @@ BPoseView::MessageReceived(BMessage *message)
 					// we must save the current view origin if we come from
 					// any icon mode. We can't do that in SetViewMode() since
 					// Refresh() resets the current view origin.
+					// TODO: Shouldn't be needed anymore
 					if (ViewMode() != kListMode)
 						fViewState->SetIconOrigin(LeftTop());
 										
@@ -2727,6 +2729,7 @@ BPoseView::SetViewMode(uint32 newMode)
 	}
 
 	// save the current origin and get origin for new view mode
+	// TODO: shouldn't be needed anymore
 	BPoint origin(LeftTop());
 	BPoint newOrigin(origin);
 
@@ -7221,7 +7224,8 @@ BPoseView::DeletePose(const node_ref *itemNode, BPose *pose, int32 index)
 			int32 index = (int32)(bounds.bottom / fListElemHeight);
 			BPose *pose = fPoseList->ItemAt(index);
 			if (!pose && bounds.top > 0) // scroll up a little
-				ScrollTo(bounds.left, max_c(bounds.top - fListElemHeight, 0));
+				BView::ScrollTo(bounds.left,
+					max_c(bounds.top - fListElemHeight, 0));
 		}
 
 		delete pose;

src/kits/tracker/PoseView.h

@@ -146,6 +146,7 @@ class BPoseView : public BView {
 		virtual	void KeyDown(const char *, int32);
 		virtual void Pulse();
 		virtual void MoveBy(float, float);
+		virtual void ScrollTo(BPoint point);
 
 		// misc. mode setters
 		void SetMultipleSelection(bool);

src/kits/tracker/ViewState.cpp

@@ -287,7 +287,8 @@ BViewState::BViewState()
 	fSecondarySortAttr = 0;
 	fSecondarySortType = 0;
 	fReverseSort = false;
-	fStateNeedsSaving = false;
+	
+	_StorePreviousState();
 }
 
 
@@ -317,8 +318,7 @@ BViewState::BViewState(BMallocIO *stream, bool endianSwap)
 		fSecondarySortType = B_SWAP_INT32(fSecondarySortType);
 	}
 
-	fStateNeedsSaving = false;
+	_StorePreviousState();
-
 	_Sanitize(this, true);
 }
 
@@ -334,8 +334,8 @@ BViewState::BViewState(const BMessage &message)
 	message.FindInt32(kViewStateSecondarySortAttrName, (int32 *)&fSecondarySortAttr);
 	message.FindInt32(kViewStateSecondarySortTypeName, (int32 *)&fSecondarySortType);
 	message.FindBool(kViewStateReverseSortName, &fReverseSort);
-	fStateNeedsSaving = false;
 
+	_StorePreviousState();
 	_Sanitize(this, true);
 }
 
@@ -415,6 +415,22 @@ BViewState::InstantiateFromMessage(const BMessage &message)
 }
 
 
+void
+BViewState::_StorePreviousState()
+{
+	fPreviousViewMode = fViewMode;
+	fPreviousLastIconMode = fLastIconMode;
+	fPreviousIconSize = fIconSize;
+	fPreviousListOrigin = fListOrigin;
+	fPreviousIconOrigin = fIconOrigin;
+	fPreviousPrimarySortAttr = fPrimarySortAttr;
+	fPreviousSecondarySortAttr = fSecondarySortAttr;
+	fPreviousPrimarySortType = fPrimarySortType;
+	fPreviousSecondarySortType = fSecondarySortType;
+	fPreviousReverseSort = fReverseSort;
+}
+
+
 BViewState *
 BViewState::_Sanitize(BViewState *state, bool fixOnly)
 {

src/kits/tracker/ViewState.h

@@ -133,7 +133,6 @@ class BViewState {
 		void SetReverseSort(bool);
 
 		bool StateNeedsSaving();
-		void MarkSaved();
 
 	private:
 		static BViewState *_Sanitize(BViewState *state, bool fixOnly = false);
@@ -148,7 +147,19 @@ class BViewState {
 		uint32 fPrimarySortType;
 		uint32 fSecondarySortType;
 		bool fReverseSort;
-		bool fStateNeedsSaving;
+		
+		void _StorePreviousState();
+		
+		uint32 	fPreviousViewMode;
+		uint32 	fPreviousLastIconMode;
+		uint32 	fPreviousIconSize;
+		BPoint 	fPreviousListOrigin;
+		BPoint 	fPreviousIconOrigin;
+		uint32 	fPreviousPrimarySortAttr;
+		uint32 	fPreviousSecondarySortAttr;
+		uint32 	fPreviousPrimarySortType;
+		uint32 	fPreviousSecondarySortType;
+		bool 	fPreviousReverseSort;		
 };
 
 
@@ -287,18 +298,12 @@ BViewState::ReverseSort() const
 inline void
 BViewState::SetViewMode(uint32 mode)
 {
-	if (mode != fViewMode)
-		fStateNeedsSaving = true;
-	
 	fViewMode = mode;
 }
 
 inline void
 BViewState::SetLastIconMode(uint32 mode)
 {
-	if (mode != fLastIconMode)
-		fStateNeedsSaving = true;
-
 	fLastIconMode = mode;
 }
 
@@ -311,79 +316,60 @@ BViewState::SetIconSize(uint32 size)
 inline void
 BViewState::SetListOrigin(BPoint newOrigin)
 {
-	if (newOrigin != fListOrigin)
-		fStateNeedsSaving = true;
-
 	fListOrigin = newOrigin;
 }
 
 inline void
 BViewState::SetIconOrigin(BPoint newOrigin)
 {
-	if (newOrigin != fIconOrigin)
-		fStateNeedsSaving = true;
-	
 	fIconOrigin = newOrigin;
 }
 
 inline void
 BViewState::SetPrimarySort(uint32 attr)
 {
-	if (attr != fPrimarySortAttr)
-		fStateNeedsSaving = true;
-	
 	fPrimarySortAttr = attr;
 }
 
 inline void
 BViewState::SetSecondarySort(uint32 attr)
 {
-	if (attr != fSecondarySortAttr)
-		fStateNeedsSaving = true;
-
 	fSecondarySortAttr = attr;
 }
 
 inline void
 BViewState::SetPrimarySortType(uint32 type)
 {
-	if (type != fPrimarySortType)
-		fStateNeedsSaving = true;
-
 	fPrimarySortType = type;
 }
 
 inline void
 BViewState::SetSecondarySortType(uint32 type)
 {
-	if (type != fSecondarySortType)
-		fStateNeedsSaving = true;
-
 	fSecondarySortType = type;
 }
 
 inline void
 BViewState::SetReverseSort(bool on)
 {
-	if (fReverseSort != on)
-		fStateNeedsSaving = true;
-
 	fReverseSort = on;
 }
 
 inline bool
 BViewState::StateNeedsSaving()
 {
-	return fStateNeedsSaving;	
+	return (fPreviousViewMode != fViewMode)
+		|| (fPreviousLastIconMode != fLastIconMode)
+		|| (fPreviousIconSize != fIconSize)
+		|| (fPreviousListOrigin != fListOrigin)
+		|| (fPreviousIconOrigin != fIconOrigin)
+		|| (fPreviousPrimarySortAttr != fPrimarySortAttr)
+		|| (fPreviousSecondarySortAttr != fSecondarySortAttr)
+		|| (fPreviousPrimarySortType != fPrimarySortType)
+		|| (fPreviousSecondarySortType != fSecondarySortType)
+		|| (fPreviousReverseSort != fReverseSort);
 }
 
-inline void
-BViewState::MarkSaved()
-{
-	fStateNeedsSaving = false;	
-}
-
-
 } // namespace BPrivate
 
 using namespace BPrivate;