From ff043e669aabcfbc71180fde97c9ef28bfe01c02 Mon Sep 17 00:00:00 2001
From: Zufu Liu <unknown>
Date: Sun, 23 Oct 2022 08:45:52 +1100
Subject: Feature [feature-requests:#1457] Reuse MouseWheelDelta for
 autocompletion lists. This code triggers when wheel rotated and mouse is
 outside list.

---
 win32/PlatWin.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'win32/PlatWin.h')

diff --git a/win32/PlatWin.h b/win32/PlatWin.h
index 893618b38..68098f9c7 100644
--- a/win32/PlatWin.h
+++ b/win32/PlatWin.h
@@ -49,6 +49,20 @@ int SystemMetricsForDpi(int nIndex, UINT dpi) noexcept;
 
 HCURSOR LoadReverseArrowCursor(UINT dpi) noexcept;
 
+class MouseWheelDelta {
+	int wheelDelta = 0;
+public:
+	bool Accumulate(WPARAM wParam) noexcept {
+		wheelDelta -= GET_WHEEL_DELTA_WPARAM(wParam);
+		return std::abs(wheelDelta) >= WHEEL_DELTA;
+	}
+	int Actions() noexcept {
+		const int actions = wheelDelta / WHEEL_DELTA;
+		wheelDelta = wheelDelta % WHEEL_DELTA;
+		return actions;
+	}
+};
+
 #if defined(USE_D2D)
 extern bool LoadD2D();
 extern ID2D1Factory *pD2DFactory;
-- 
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