From f82ad78db96307c4cfc89b5ef1bb4795e68fbfbe Mon Sep 17 00:00:00 2001
From: Brian Ferguson <ferguson.brian@gmail.com>
Date: Fri, 23 Nov 2012 12:08:40 -0700
Subject: [PATCH] Added mouse scrolling for meter windows without focus.

---
 Library/MeterWindow.cpp | 51 +++++++++++++++++++++++++++++++++++++++++
 Library/MeterWindow.h   |  3 +++
 2 files changed, 54 insertions(+)

diff --git a/Library/MeterWindow.cpp b/Library/MeterWindow.cpp
index c51b2a83..1b4e7e3c 100644
--- a/Library/MeterWindow.cpp
+++ b/Library/MeterWindow.cpp
@@ -272,6 +272,16 @@ void CMeterWindow::Initialize()
 			FadeWindow(0, m_AlphaValue);
 		}
 	}
+
+	RAWINPUTDEVICE raw[1];
+	raw[0].usUsagePage = 0x01;
+	raw[0].usUsage = 0x02;
+	raw[0].dwFlags = RIDEV_INPUTSINK;
+	raw[0].hwndTarget = m_Window;
+	if (!RegisterRawInputDevices(raw, 1, sizeof(raw[0])))
+	{
+		Log(LOG_WARNING, L"Error registering raw input mouse device.");
+	}
 }
 
 /*
@@ -4415,6 +4425,46 @@ bool CMeterWindow::DoMoveAction(int x, int y, MOUSEACTION action)
 	return false;
 }
 
+/*
+** Sends mouse wheel messages to the window if the window does not have focus.
+**
+*/
+LRESULT CMeterWindow::OnMouseInput(UINT uMsg, WPARAM wParam, LPARAM lParam)
+{
+	POINT pos;
+	GetCursorPos(&pos);
+	HWND hwnd = WindowFromPoint(pos);
+
+	// Only process RAW data if the mouse is over a meter window that does not have focus
+	if (Rainmeter->GetMeterWindow(hwnd) && hwnd != GetForegroundWindow())
+	{
+		UINT dwSize;
+		LPBYTE lpb = new BYTE[48];
+
+		GetRawInputData((HRAWINPUT)lParam, RID_INPUT, lpb, &dwSize, sizeof(RAWINPUTHEADER));
+
+		RAWINPUT* raw = (RAWINPUT*)lpb;
+		if (raw->header.dwType == RIM_TYPEMOUSE) 
+		{
+			WPARAM wparam = MAKEWPARAM(0, HIWORD((short)raw->data.mouse.usButtonData));
+			LPARAM lparam = MAKELPARAM(pos.x, pos.y);
+
+			if (raw->data.mouse.usButtonFlags == RI_MOUSE_WHEEL)
+			{
+				PostMessage(hwnd, WM_MOUSEWHEEL, wparam, lparam);
+			}
+			else if (raw->data.mouse.usButtonFlags == RI_MOUSE_HORIZONTAL_WHEEL)
+			{
+				PostMessage(hwnd, WM_MOUSEHWHEEL, wparam, lparam);
+			}
+		}
+
+		delete[] lpb;
+	}
+
+    return 0;
+}
+
 /*
 ** Stores the new place of the window, in screen coordinates.
 **
@@ -4447,6 +4497,7 @@ LRESULT CALLBACK CMeterWindow::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPAR
 	CMeterWindow* window = (CMeterWindow*)GetWindowLongPtr(hWnd, GWLP_USERDATA);
 
 	BEGIN_MESSAGEPROC
+	MESSAGE(OnMouseInput, WM_INPUT)
 	MESSAGE(OnMove, WM_MOVE)
 	MESSAGE(OnTimer, WM_TIMER)
 	MESSAGE(OnCommand, WM_COMMAND)
diff --git a/Library/MeterWindow.h b/Library/MeterWindow.h
index 90e783b2..417907e8 100644
--- a/Library/MeterWindow.h
+++ b/Library/MeterWindow.h
@@ -38,6 +38,8 @@
 
 #define METERWINDOW_CLASS_NAME	L"RainmeterMeterWindow"
 
+#define RI_MOUSE_HORIZONTAL_WHEEL 0x0800
+
 typedef HRESULT (WINAPI * FPDWMENABLEBLURBEHINDWINDOW)(HWND hWnd, const DWM_BLURBEHIND* pBlurBehind);
 typedef HRESULT (WINAPI * FPDWMGETCOLORIZATIONCOLOR)(DWORD* pcrColorization, BOOL* pfOpaqueBlend);
 typedef HRESULT (WINAPI * FPDWMSETWINDOWATTRIBUTE)(HWND hwnd, DWORD dwAttribute, LPCVOID pvAttribute, DWORD cbAttribute);
@@ -249,6 +251,7 @@ protected:
 	static LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
 	static LRESULT CALLBACK InitialWndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
 
+	LRESULT OnMouseInput(UINT uMsg, WPARAM wParam, LPARAM lParam);
 	LRESULT OnMove(UINT uMsg, WPARAM wParam, LPARAM lParam);
 	LRESULT OnTimer(UINT uMsg, WPARAM wParam, LPARAM lParam);
 	LRESULT OnCommand(UINT uMsg, WPARAM wParam, LPARAM lParam);