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// https://github.com/ysc3839/win32-darkmode/blob/master/win32-darkmode/DarkMode.h
#pragma once
#include <Windows.h>
#include <dwmapi.h>
//#include "IatHook.h"
enum IMMERSIVE_HC_CACHE_MODE
{
IHCM_USE_CACHED_VALUE,
IHCM_REFRESH
};
// Insider 18334
enum PreferredAppMode
{
Default,
AllowDark,
ForceDark,
ForceLight,
Max
};
using fnRtlGetNtVersionNumbers = void (WINAPI *)(LPDWORD major, LPDWORD minor, LPDWORD build);
// 1809 17763
using fnShouldAppsUseDarkMode = bool (WINAPI *)(); // ordinal 132
using fnAllowDarkModeForWindow = bool (WINAPI *)(HWND hWnd, bool allow); // ordinal 133
using fnAllowDarkModeForApp = bool (WINAPI *)(bool allow); // ordinal 135, removed since 18334
using fnFlushMenuThemes = void (WINAPI *)(); // ordinal 136
using fnRefreshImmersiveColorPolicyState = void (WINAPI *)(); // ordinal 104
using fnIsDarkModeAllowedForWindow = bool (WINAPI *)(HWND hWnd); // ordinal 137
using fnGetIsImmersiveColorUsingHighContrast = bool (WINAPI *)(IMMERSIVE_HC_CACHE_MODE mode); // ordinal 106
using fnOpenNcThemeData = HTHEME(WINAPI *)(HWND hWnd, LPCWSTR pszClassList); // ordinal 49
// Insider 18290
using fnShouldSystemUseDarkMode = bool (WINAPI *)(); // ordinal 138
// Insider 18334
using fnSetPreferredAppMode = PreferredAppMode(WINAPI *)(PreferredAppMode appMode); // ordinal 135, since 18334
using fnIsDarkModeAllowedForApp = bool (WINAPI *)(); // ordinal 139
fnShouldAppsUseDarkMode _ShouldAppsUseDarkMode = nullptr;
fnAllowDarkModeForWindow _AllowDarkModeForWindow = nullptr;
fnAllowDarkModeForApp _AllowDarkModeForApp = nullptr;
fnFlushMenuThemes _FlushMenuThemes = nullptr;
fnRefreshImmersiveColorPolicyState _RefreshImmersiveColorPolicyState = nullptr;
fnIsDarkModeAllowedForWindow _IsDarkModeAllowedForWindow = nullptr;
fnGetIsImmersiveColorUsingHighContrast _GetIsImmersiveColorUsingHighContrast = nullptr;
fnOpenNcThemeData _OpenNcThemeData = nullptr;
// Insider 18290
fnShouldSystemUseDarkMode _ShouldSystemUseDarkMode = nullptr;
// Insider 18334
fnSetPreferredAppMode _SetPreferredAppMode = nullptr;
bool g_darkModeSupported = false;
bool g_darkModeEnabled = false;
DWORD g_buildNumber = 0;
bool AllowDarkModeForWindow(HWND hWnd, bool allow)
{
if (g_darkModeSupported)
return _AllowDarkModeForWindow(hWnd, allow);
return false;
}
bool IsHighContrast()
{
HIGHCONTRASTW highContrast = { sizeof(highContrast) };
if (SystemParametersInfoW(SPI_GETHIGHCONTRAST, sizeof(highContrast), &highContrast, FALSE))
return highContrast.dwFlags & HCF_HIGHCONTRASTON;
return false;
}
void RefreshTitleBarThemeColor(HWND hWnd)
{
BOOL dark = FALSE;
if (_IsDarkModeAllowedForWindow(hWnd) &&
_ShouldAppsUseDarkMode() &&
!IsHighContrast())
{
dark = TRUE;
}
DwmSetWindowAttribute(hWnd, 19, &dark, sizeof(dark));
}
bool IsColorSchemeChangeMessage(LPARAM lParam)
{
bool is = false;
if (lParam && CompareStringOrdinal(reinterpret_cast<LPCWCH>(lParam), -1, L"ImmersiveColorSet", -1, TRUE) == CSTR_EQUAL)
{
_RefreshImmersiveColorPolicyState();
is = true;
}
_GetIsImmersiveColorUsingHighContrast(IHCM_REFRESH);
return is;
}
bool IsColorSchemeChangeMessage(UINT message, LPARAM lParam)
{
if (message == WM_SETTINGCHANGE)
return IsColorSchemeChangeMessage(lParam);
return false;
}
void AllowDarkModeForApp(bool allow)
{
if (_AllowDarkModeForApp)
_AllowDarkModeForApp(allow);
else if (_SetPreferredAppMode)
_SetPreferredAppMode(allow ? AllowDark : Default);
}
void FixDarkScrollBar()
{
#if 0
auto addr = FindDelayLoadThunkInModule(GetModuleHandleW(L"comctl32.dll"), "uxtheme.dll", 49); // OpenNcThemeData
if (addr)
{
DWORD oldProtect;
if (VirtualProtect(addr, sizeof(IMAGE_THUNK_DATA), PAGE_READWRITE, &oldProtect))
{
auto MyOpenThemeData = [](HWND hWnd, LPCWSTR classList) -> HTHEME {
if (wcscmp(classList, L"ScrollBar") == 0)
{
hWnd = nullptr;
classList = L"Explorer::ScrollBar";
}
return _OpenNcThemeData(hWnd, classList);
};
addr->u1.Function = reinterpret_cast<ULONG_PTR>(static_cast<fnOpenNcThemeData>(MyOpenThemeData));
VirtualProtect(addr, sizeof(IMAGE_THUNK_DATA), oldProtect, &oldProtect);
}
}
#endif
}
void InitDarkMode()
{
fnRtlGetNtVersionNumbers RtlGetNtVersionNumbers = reinterpret_cast<fnRtlGetNtVersionNumbers>(GetProcAddress(GetModuleHandleW(L"ntdll.dll"), "RtlGetNtVersionNumbers"));
if (RtlGetNtVersionNumbers)
{
DWORD major, minor;
RtlGetNtVersionNumbers(&major, &minor, &g_buildNumber);
g_buildNumber &= ~0xF0000000;
if (major == 10 && minor == 0 && 17763 <= g_buildNumber && g_buildNumber <= 18362) // Windows 10 1809 10.0.17763 - 1903 10.0.18362
{
HMODULE hUxtheme = LoadLibraryExW(L"uxtheme.dll", nullptr, LOAD_LIBRARY_SEARCH_SYSTEM32);
if (hUxtheme)
{
_OpenNcThemeData = reinterpret_cast<fnOpenNcThemeData>(GetProcAddress(hUxtheme, MAKEINTRESOURCEA(49)));
_RefreshImmersiveColorPolicyState = reinterpret_cast<fnRefreshImmersiveColorPolicyState>(GetProcAddress(hUxtheme, MAKEINTRESOURCEA(104)));
_GetIsImmersiveColorUsingHighContrast = reinterpret_cast<fnGetIsImmersiveColorUsingHighContrast>(GetProcAddress(hUxtheme, MAKEINTRESOURCEA(106)));
_ShouldAppsUseDarkMode = reinterpret_cast<fnShouldAppsUseDarkMode>(GetProcAddress(hUxtheme, MAKEINTRESOURCEA(132)));
_AllowDarkModeForWindow = reinterpret_cast<fnAllowDarkModeForWindow>(GetProcAddress(hUxtheme, MAKEINTRESOURCEA(133)));
auto ord135 = GetProcAddress(hUxtheme, MAKEINTRESOURCEA(135));
if (g_buildNumber < 18334)
_AllowDarkModeForApp = reinterpret_cast<fnAllowDarkModeForApp>(ord135);
else
_SetPreferredAppMode = reinterpret_cast<fnSetPreferredAppMode>(ord135);
//_FlushMenuThemes = reinterpret_cast<fnFlushMenuThemes>(GetProcAddress(hUxtheme, MAKEINTRESOURCEA(136)));
_IsDarkModeAllowedForWindow = reinterpret_cast<fnIsDarkModeAllowedForWindow>(GetProcAddress(hUxtheme, MAKEINTRESOURCEA(137)));
if (_OpenNcThemeData &&
_RefreshImmersiveColorPolicyState &&
_ShouldAppsUseDarkMode &&
_AllowDarkModeForWindow &&
(_AllowDarkModeForApp || _SetPreferredAppMode) &&
//_FlushMenuThemes &&
_IsDarkModeAllowedForWindow)
{
g_darkModeSupported = true;
AllowDarkModeForApp(true);
_RefreshImmersiveColorPolicyState();
g_darkModeEnabled = _ShouldAppsUseDarkMode() && !IsHighContrast();
FixDarkScrollBar();
}
}
}
}
}
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