From 68d456d0d0b273805bc0bc5f7472ac63e172e0a7 Mon Sep 17 00:00:00 2001
From: nyamatongwe <devnull@localhost>
Date: Wed, 9 Jan 2002 12:01:59 +0000
Subject: Optimization that asks for the position of the scroll bar and does
 not set it if it does not change. Using scroll bar APIs that allow larger 32
 bit values.

---
 win32/ScintillaWin.cxx | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

(limited to 'win32')

diff --git a/win32/ScintillaWin.cxx b/win32/ScintillaWin.cxx
index 1293d0737..ccf7402a1 100644
--- a/win32/ScintillaWin.cxx
+++ b/win32/ScintillaWin.cxx
@@ -847,12 +847,25 @@ void ScintillaWin::ScrollText(int linesToMove) {
 	::UpdateWindow(MainHWND());
 }
 
+// Change the scroll position but avoid repaint if changing to same value
+static void ChangeScrollPos(HWND w, int barType, int pos) {
+	SCROLLINFO sci = {
+		sizeof(sci),0,0,0,0,0,0
+	};
+	sci.fMask = SIF_POS;
+	::GetScrollInfo(w, barType, &sci);
+	if (sci.nPos != pos) {
+		sci.nPos = pos;
+		::SetScrollInfo(w, barType, &sci, TRUE);
+	}
+}
+
 void ScintillaWin::SetVerticalScrollPos() {
-	::SetScrollPos(MainHWND(), SB_VERT, topLine, TRUE);
+	ChangeScrollPos(MainHWND(), SB_VERT, topLine);
 }
 
 void ScintillaWin::SetHorizontalScrollPos() {
-	::SetScrollPos(MainHWND(), SB_HORZ, xOffset, TRUE);
+	ChangeScrollPos(MainHWND(), SB_HORZ, xOffset);
 }
 
 bool ScintillaWin::ModifyScrollBars(int nMax, int nPage) {
-- 
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