Ctrl + scroll doesn't work when window is not focused

[KyrietS]

Scroll works but Ctrl+scroll does not. Is it possible to capture Ctrl pressed when window does not have focus?

I'm not sure if it's possible to do in glfw. Probably not. When window is not focused it cannot capture key events so it won't be possible to detect Ctrl + Scroll in unfocused window :(. I would need to use WinAPI for this. (on Linux it depends on windowing system and it's not even supported in Wayland)

[KyrietS]

For Windows I can use GetAsyncKeyState

For Linux with X11 I can do:

#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <iostream>
#include <unistd.h> // for sleep

bool isCtrlPressed(Display* display) {
    char keys_return[32];
    XQueryKeymap(display, keys_return);

    KeyCode lctrl = XKeysymToKeycode(display, XK_Control_L);
    KeyCode rctrl = XKeysymToKeycode(display, XK_Control_R);

    return (keys_return[lctrl / 8] & (1 << (lctrl % 8))) ||
           (keys_return[rctrl / 8] & (1 << (rctrl % 8)));
}

int main() {
    Display* display = XOpenDisplay(NULL);
    if (!display) {
        std::cerr << "Cannot open display\n";
        return 1;
    }

    std::cout << "Monitoring Ctrl key...\n";

    while (true) {
        if (isCtrlPressed(display)) {
            std::cout << "Ctrl is pressed!\n";
        }
        usleep(100000); // 100ms
    }

    XCloseDisplay(display);
    return 0;
}

I tested both solutions and they work.