Added a low level mouse hook

PowerToys.sln

@@ -22,6 +22,7 @@ EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "interface", "interface", "{3BB8493E-D18E-4485-A320-CB40F90F55AE}"
 	ProjectSection(SolutionItems) = preProject
 		src\modules\interface\lowlevel_keyboard_event_data.h = src\modules\interface\lowlevel_keyboard_event_data.h
+		src\modules\interface\lowlevel_mouse_event_data.h = src\modules\interface\lowlevel_mouse_event_data.h
 		src\modules\interface\powertoy_module_interface.h = src\modules\interface\powertoy_module_interface.h
 		src\modules\interface\win_hook_event_data.h = src\modules\interface\win_hook_event_data.h
 	EndProjectSection

src/modules/interface/lowlevel_mouse_event_data.h

@@ -0,0 +1,13 @@
+#pragma once
+#include <Windows.h>
+
+namespace
+{
+	const wchar_t* ll_mouse = L"ll_mouse";
+}
+
+struct LowlevelMouseEvent
+{
+	MSLLHOOKSTRUCT* lParam;
+	WPARAM wParam;
+};

src/runner/lowlevel_mouse_event.cpp

@@ -0,0 +1,45 @@
+#include "pch.h"
+#include "lowlevel_mouse_event.h"
+#include "powertoys_events.h"
+
+namespace
+{
+	HHOOK hook_handle = nullptr;
+	HHOOK hook_handle_copy = nullptr; // Why should we use this in CallNextHookEx call?
+	LRESULT CALLBACK hook_proc(int nCode, WPARAM wParam, LPARAM lParam)
+	{
+		LowlevelMouseEvent event;
+		if (nCode == HC_ACTION)
+		{
+			event.lParam = reinterpret_cast<MSLLHOOKSTRUCT*>(lParam);
+			event.wParam = wParam;
+			if (powertoys_events().signal_event(ll_mouse, reinterpret_cast<intptr_t>(&event)) != 0)
+			{
+				return 1;
+			}
+		}
+		return CallNextHookEx(hook_handle_copy, nCode, wParam, lParam);
+	}
+}
+
+void start_lowlevel_mouse_hook()
+{
+	if (!hook_handle)
+	{
+		hook_handle = SetWindowsHookEx(WH_MOUSE_LL, hook_proc, GetModuleHandle(NULL), NULL);
+		hook_handle_copy = hook_handle;
+		if (!hook_handle)
+		{
+			throw std::runtime_error("Cannot install mouse listener");
+		}
+	}
+}
+
+void stop_lowlevel_mouse_hook()
+{
+	if (hook_handle)
+	{
+		UnhookWindowsHookEx(hook_handle);
+		hook_handle = nullptr;
+	}
+}

src/runner/lowlevel_mouse_event.h

@@ -0,0 +1,5 @@
+#pragma once
+#include <interface/lowlevel_mouse_event_data.h>
+
+void start_lowlevel_mouse_hook();
+void stop_lowlevel_mouse_hook();

src/runner/powertoys_events.cpp

@@ -2,19 +2,24 @@
 #include "powertoys_events.h"
 #include "lowlevel_keyboard_event.h"
 #include "win_hook_event.h"
+#include "lowlevel_mouse_event.h"
 
 void first_subscribed(const std::wstring& event) {
   if (event == ll_keyboard)
     start_lowlevel_keyboard_hook();
   else if (event == win_hook_event)
     start_win_hook_event();
+  else if (event == ll_mouse)
+	  start_lowlevel_mouse_hook();
 }
 
 void last_unsubscribed(const std::wstring& event) {
   if (event == ll_keyboard)
     stop_lowlevel_keyboard_hook();
   else if (event == win_hook_event)
     stop_win_hook_event();
+  else if (event == ll_mouse)
+	  stop_lowlevel_mouse_hook();
 }
 
 PowertoysEvents& powertoys_events() {

src/runner/runner.vcxproj

@@ -99,6 +99,7 @@
     <ClCompile Include="auto_start_helper.cpp" />
     <ClCompile Include="general_settings.cpp" />
     <ClCompile Include="lowlevel_keyboard_event.cpp" />
+    <ClCompile Include="lowlevel_mouse_event.cpp" />
     <ClCompile Include="pch.cpp">
       <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">Create</PrecompiledHeader>
       <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Release|x64'">Create</PrecompiledHeader>
@@ -116,6 +117,7 @@
     <ClInclude Include="auto_start_helper.h" />
     <ClInclude Include="general_settings.h" />
     <ClInclude Include="lowlevel_keyboard_event.h" />
+    <ClInclude Include="lowlevel_mouse_event.h" />
     <ClInclude Include="pch.h" />
     <ClInclude Include="powertoys_events.h" />
     <ClInclude Include="powertoy_module.h" />

src/runner/runner.vcxproj.filters

@@ -33,6 +33,9 @@
     <ClCompile Include="win_hook_event.cpp">
       <Filter>Events</Filter>
     </ClCompile>
+    <ClCompile Include="lowlevel_mouse_event.cpp">
+      <Filter>Events</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="pch.h" />
@@ -67,6 +70,9 @@
     <ClInclude Include="win_hook_event.h">
       <Filter>Events</Filter>
     </ClInclude>
+    <ClInclude Include="lowlevel_mouse_event.h">
+      <Filter>Events</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Filter Include="Utils">