Dark window titlebar

[Josh]

You can make a Window have dark / black titlebar without overriding drawing:

#include <dwmapi.h> // put this somewhere...
  
	//Get the display list
    auto displays = GetDisplays();

    //Create a window
    auto window = CreateWindow("Ultra Engine", 0, 0, 1280, 720, displays[0], WINDOW_HIDDEN | WINDOW_CENTER | WINDOW_TITLEBAR);

    BOOL USE_DARK_MODE = true;
    BOOL SET_IMMERSIVE_DARK_MODE_SUCCESS = SUCCEEDED(DwmSetWindowAttribute(
        window->GetHandle(), DWMWINDOWATTRIBUTE::DWMWA_USE_IMMERSIVE_DARK_MODE,
        &USE_DARK_MODE, sizeof(USE_DARK_MODE)));

    window->SetHidden(false);

This requires the WIndows 11 SDK to be installed (which still works with Win10).

Unfortunately on Windows 10 it appears all this does is prevent the window titlebar from being white when it is not active. The titlbar will still be the primary system color when the window is active. But it's an improvement.

https://stackoverflow.com/questions/39261826/change-the-color-of-the-title-bar-caption-of-a-win32-application

 

[reepblue]

I've been playing with this. I found out that you can combine this snip with the one below along with Interface::LoadColorScheme, you can get your app to be painted in the user's theme on Windows. Something that would be nice is to have an event we can use, but I don't think the OS makes one when the theme is changed.

bool is_light_theme() {
    // based on https://stackoverflow.com/questions/51334674/how-to-detect-windows-10-light-dark-mode-in-win32-application

    // The value is expected to be a REG_DWORD, which is a signed 32-bit little-endian
    auto buffer = std::vector<char>(4);
    auto cbData = static_cast<DWORD>(buffer.size() * sizeof(char));
    auto res = RegGetValueW(
        HKEY_CURRENT_USER,
        L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
        L"AppsUseLightTheme",
        RRF_RT_REG_DWORD, // expected value type
        nullptr,
        buffer.data(),
        &cbData);

    if (res != ERROR_SUCCESS) {
        throw std::runtime_error("Error: error_code=" + std::to_string(res));
    }

    // convert bytes written to our buffer to an int, assuming little-endian
    auto i = int(buffer[3] << 24 |
        buffer[2] << 16 |
        buffer[1] << 8 |
        buffer[0]);

    return i == 1;
}