From a63f5b875b9d31f8932ca62537ae7b863ef7f8b8 Mon Sep 17 00:00:00 2001
From: jacob1 <jfu614@gmail.com>
Date: Sun, 21 Jul 2013 15:59:51 -0400
Subject: [PATCH] when scrolling up through comments, it starts at the bottom
 of the page instead of the top

---
 src/gui/interface/ScrollPanel.cpp |  5 +++++
 src/gui/interface/ScrollPanel.h   |  1 +
 src/gui/preview/PreviewView.cpp   | 28 ++++++++++++----------------
 src/gui/preview/PreviewView.h     |  1 +
 4 files changed, 19 insertions(+), 16 deletions(-)

diff --git a/src/gui/interface/ScrollPanel.cpp b/src/gui/interface/ScrollPanel.cpp
index 11a4f71a6..f1e80949b 100644
--- a/src/gui/interface/ScrollPanel.cpp
+++ b/src/gui/interface/ScrollPanel.cpp
@@ -28,6 +28,11 @@ int ScrollPanel::GetScrollLimit()
 	return 0;
 }
 
+void ScrollPanel::SetScrollPosition(int position)
+{
+	offsetY = position;
+}
+
 void ScrollPanel::XOnMouseWheelInside(int localx, int localy, int d)
 {
 	if(!d)
diff --git a/src/gui/interface/ScrollPanel.h b/src/gui/interface/ScrollPanel.h
index 08b50699b..0d48658fe 100644
--- a/src/gui/interface/ScrollPanel.h
+++ b/src/gui/interface/ScrollPanel.h
@@ -21,6 +21,7 @@ namespace ui
 		ScrollPanel(Point position, Point size);
 
 		int GetScrollLimit();
+		void SetScrollPosition(int position);
 
 		virtual void Draw(const Point& screenPos);
 		virtual void XTick(float dt);
diff --git a/src/gui/preview/PreviewView.cpp b/src/gui/preview/PreviewView.cpp
index f55f6b5fb..590798e3f 100644
--- a/src/gui/preview/PreviewView.cpp
+++ b/src/gui/preview/PreviewView.cpp
@@ -69,7 +69,8 @@ PreviewView::PreviewView():
 	addCommentBox(NULL),
 	submitCommentButton(NULL),
 	commentBoxHeight(20),
-	showAvatars(true)
+	showAvatars(true),
+	prevPage(false)
 {
 	class FavAction: public ui::ButtonAction
 	{
@@ -374,7 +375,10 @@ void PreviewView::OnMouseWheel(int x, int y, int d)
 	if(commentsPanel->GetScrollLimit() == 1 && d < 0)
 		c->NextCommentPage();
 	if(commentsPanel->GetScrollLimit() == -1 && d > 0)
+	{
+		prevPage = true;
 		c->PrevCommentPage();
+	}
 
 }
 
@@ -585,24 +589,16 @@ void PreviewView::NotifyCommentsChanged(PreviewModel * sender)
 		}
 
 		commentsPanel->InnerSize = ui::Point(commentsPanel->Size.X, currentY+4);
+		if (prevPage)
+		{
+			prevPage = false;
+			commentsPanel->SetScrollPosition(currentY);
+			//update positions of the comments so that it doesn't start at the top for a frame
+			commentsPanel->Tick(0);
+		}
 	}
 }
 
-/*void PreviewView::NotifyPreviewChanged(PreviewModel * sender)
-{
-	savePreview = sender->GetGameSave();
-	if(savePreview && savePreview->Data && !(savePreview->Width == XRES/2 && savePreview->Height == YRES/2))
-	{
-		int newSizeX, newSizeY;
-		float factorX = ((float)XRES/2)/((float)savePreview->Width);
-		float factorY = ((float)YRES/2)/((float)savePreview->Height);
-		float scaleFactor = factorY < factorX ? factorY : factorX;
-		savePreview->Data = Graphics::resample_img(savePreview->Data, savePreview->Width, savePreview->Height, savePreview->Width*scaleFactor, savePreview->Height*scaleFactor);
-		savePreview->Width *= scaleFactor;
-		savePreview->Height *= scaleFactor;
-	}
-}*/
-
 PreviewView::~PreviewView()
 {
 	if(addCommentBox)
diff --git a/src/gui/preview/PreviewView.h b/src/gui/preview/PreviewView.h
index 25c377207..9ddbb712e 100644
--- a/src/gui/preview/PreviewView.h
+++ b/src/gui/preview/PreviewView.h
@@ -49,6 +49,7 @@ class PreviewView: public ui::Window {
 	int votesDown;
 	bool doOpen;
 	bool showAvatars;
+	bool prevPage;
 
 	int commentBoxHeight;
 	float commentBoxPositionX;