From 073480a615d644f8c61e339a500243db00989a80 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20K=C3=BCng?= <unknown>
Date: Tue, 27 Sep 2016 10:03:48 +1000
Subject: On Win32, mouse wheel scrolling can be restricted to only occur when
 the mouse is within the window.

---
 win32/ScintillaWin.cxx | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'win32')

diff --git a/win32/ScintillaWin.cxx b/win32/ScintillaWin.cxx
index 10d119b5a..3de78d1d4 100644
--- a/win32/ScintillaWin.cxx
+++ b/win32/ScintillaWin.cxx
@@ -1272,6 +1272,18 @@ sptr_t ScintillaWin::WndProc(unsigned int iMessage, uptr_t wParam, sptr_t lParam
 			break;
 
 		case WM_MOUSEWHEEL:
+			if (!mouseWheelCaptures) {
+				// if the mouse wheel is not captured, test if the mouse
+				// pointer is over the editor window and if not, don't
+				// handle the message but pass it on.
+				RECT rc;
+				GetWindowRect(MainHWND(), &rc);
+				POINT pt;
+				pt.x = GET_X_LPARAM(lParam);
+				pt.y = GET_Y_LPARAM(lParam);
+				if (!PtInRect(&rc, pt))
+					return ::DefWindowProc(MainHWND(), iMessage, wParam, lParam);
+			}
 			// if autocomplete list active then send mousewheel message to it
 			if (ac.Active()) {
 				HWND hWnd = static_cast<HWND>(ac.lb->GetID());
-- 
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