Add dark-menus.wh.cpp (#1309)

* Add dark-menus

* Update dark-menus.wh.cpp

* Second Update

mods/dark-menus.wh.cpp

@@ -0,0 +1,67 @@
+// ==WindhawkMod==
+// @id              dark-menus
+// @name            Dark mode context menus
+// @description     Enables dark mode for all win32 menus.
+// @version         1.0
+// @author          Mgg Sk
+// @github          https://github.com/MGGSK
+// @include         *
+// ==/WindhawkMod==
+
+// ==WindhawkModReadme==
+/*
+# Dark mode context menus
+Forces dark mode for all win32 context menus to create a more consistent UI.
+
+### Before:
+![Before](https://i.imgur.com/bGRVJz8.png)
+
+### After:
+![After](https://i.imgur.com/BURKEki.png)
+*/
+// ==/WindhawkModReadme==
+
+#include <minwindef.h>
+#include <winerror.h>
+
+enum AppMode
+{
+	Default,
+	AllowDark,
+	ForceDark,
+	ForceLight,
+	Max
+};
+
+using FlushMenuThemes_T = void (WINAPI *)();
+using SetPreferredAppMode_T = HRESULT (WINAPI *)(AppMode appMode);
+
+FlushMenuThemes_T FlushMenuThemes;
+SetPreferredAppMode_T SetPreferredAppMode;
+
+//Applies the theme to all menus.
+HRESULT ApplyTheme()
+{
+    FlushMenuThemes();
+    return SetPreferredAppMode(ForceDark);
+}
+
+//Import functions
+BOOL Wh_ModInit() {
+    HMODULE hUxtheme = LoadLibraryExW(L"uxtheme.dll", nullptr, LOAD_LIBRARY_SEARCH_SYSTEM32);
+    FARPROC pSetPreferredAppMode = GetProcAddress(hUxtheme, MAKEINTRESOURCEA(135));
+    FARPROC pFlushMenuThemes = GetProcAddress(hUxtheme, MAKEINTRESOURCEA(136));
+
+    SetPreferredAppMode = reinterpret_cast<SetPreferredAppMode_T>(pSetPreferredAppMode);
+    FlushMenuThemes = reinterpret_cast<FlushMenuThemes_T>(pFlushMenuThemes);
+
+    HRESULT hResult = ApplyTheme();
+    return SUCCEEDED(hResult);
+}
+
+//Restores the default theme.
+void Wh_ModUninit()
+{
+    FlushMenuThemes();
+    SetPreferredAppMode(Default);
+}