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Feature: [Win32] Draw window title bar according to current Windows light/dark theme (#13196)

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Michael Lutz 2025-01-04 22:03:33 +01:00 committed by GitHub
parent 532f7de1f8
commit 681b0370b0
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1 changed files with 64 additions and 0 deletions
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64
src/video/win32_v.cpp
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@ -27,6 +27,9 @@
#include <windows.h>
#include <imm.h>
#include <versionhelpers.h>
#if defined(_MSC_VER) && defined(NTDDI_WIN10_RS4)
#include <winrt/Windows.UI.ViewManagement.h>
#endif
#include "../safeguards.h"
@ -397,6 +400,59 @@ static void CancelIMEComposition(HWND hwnd)
HandleTextInput(nullptr, true);
}
static bool IsDarkModeEnabled()
{
/* Only build if SDK is Windows 10 1803 or later. */
#if defined(_MSC_VER) && defined(NTDDI_WIN10_RS4)
if (IsWindows10OrGreater()) {
try {
/*
* The official documented way to find out if the system is running in dark mode is to
* check the brightness of the current theme's colour.
* See: https://learn.microsoft.com/en-us/windows/apps/desktop/modernize/ui/apply-windows-themes#know-when-dark-mode-is-enabled
*
* There are other variants floating around on the Internet, but they all rely on internal,
* undocumented Windows functions that may or may not work in the future.
*/
winrt::Windows::UI::ViewManagement::UISettings settings;
auto foreground = settings.GetColorValue(winrt::Windows::UI::ViewManagement::UIColorType::Foreground);
/* If the Foreground colour is a light colour, the system is running in dark mode. */
return ((5 * foreground.G) + (2 * foreground.R) + foreground.B) > (8 * 128);
} catch (...) {
/* Some kind of error, like a too old Windows version. Just return false. */
return false;
}
}
#endif /* defined(_MSC_VER) && defined(NTDDI_WIN10_RS4) */
return false;
}
static void SetDarkModeForWindow(HWND hWnd, bool dark_mode)
{
/* Only build if SDK is Windows 10+. */
#if defined(NTDDI_WIN10)
if (!IsWindows10OrGreater()) return;
/* This function is documented, but not supported on all Windows 10/11 SDK builds. For this
* reason, the code uses dynamic loading and ignores any errors for a best-effort result. */
static LibraryLoader _dwmapi("dwmapi.dll");
typedef HRESULT(WINAPI *PFNDWMSETWINDOWATTRIBUTE)(HWND, DWORD, LPCVOID, DWORD);
static PFNDWMSETWINDOWATTRIBUTE DwmSetWindowAttribute = _dwmapi.GetFunction("DwmSetWindowAttribute");
if (DwmSetWindowAttribute != nullptr) {
/* Contrary to the published documentation, DWMWA_USE_IMMERSIVE_DARK_MODE does not change the
* window chrome according to the current theme, but forces it to either light or dark mode.
* As such, the set value has to depend on the current theming mode.*/
BOOL value = dark_mode ? TRUE : FALSE;
if (DwmSetWindowAttribute(hWnd, 20 /* DWMWA_USE_IMMERSIVE_DARK_MODE */, &value, sizeof(value)) != S_OK) {
DwmSetWindowAttribute(hWnd, 19 /* DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1 */, &value, sizeof(value)); // Ignore errors. It works or it doesn't.
}
}
#endif /* defined(NTDDI_WIN10) */
}
LRESULT CALLBACK WndProcGdi(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
static uint32_t keycode = 0;
@ -410,6 +466,14 @@ LRESULT CALLBACK WndProcGdi(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
_cursor.in_window = false; // Win32 has mouse tracking.
SetCompositionPos(hwnd);
_imm_props = ImmGetProperty(GetKeyboardLayout(0), IGP_PROPERTY);
/* Enable dark mode theming for window chrome. */
SetDarkModeForWindow(hwnd, IsDarkModeEnabled());
break;
case WM_SETTINGCHANGE:
/* Synchronize dark mode theming state. */
SetDarkModeForWindow(hwnd, IsDarkModeEnabled());
break;
case WM_PAINT: {