SDL_WINDOWEVENT_SIZE_CHANGED and SDL_WINDOWEVENT_RESIZED not working? - c++

Question

I'm trying to detect, when the size of a SDL2 window changed. But neither SDL_WINDOWEVENT_RESIZED nor SDL_WINDOWEVENT_SIZE_CHANGED are working, at least on MacOS.
This is my code:
SDL_Init(SDL_INIT_VIDEO);
SDL_Window *win = SDL_CreateWindow("", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 100, 100, SDL_WINDOW_RESIZABLE);
SDL_Renderer *ren = SDL_CreateRenderer(win, 0, 0);
bool running = true;
SDL_Event event;
while (running) {
while(SDL_PollEvent(&event) != 0) {
if(event.type == SDL_QUIT) {
running = false;
}
if(event.type == SDL_WINDOWEVENT_SIZE_CHANGED) {
return 3;
}
if(event.type == SDL_WINDOWEVENT_RESIZED) {
return 4;
}
}
SDL_RenderClear(ren);
}
SDL_DestroyRenderer(ren);
SDL_DestroyWindow(win);
SDL_Quit();
return 0;
When running the program and resizing the window nothing happens. Am I doing something wrong or is it a bug?
Edit: I looked up the documentation on window events(https://wiki.libsdl.org/SDL_WindowEvent).
It says to write something like this:
event.window.type == SDL_WINDOWEVENT_SIZE_CHANGED
But this also isn't working.

Answer 1

SDL_WINDOWEVENT_* are not event types but SDL_WindowEventID. That is, if your event.type is SDL_WINDOWEVENT, you can access window union field for extra data, including event, e.g.
while(SDL_PollEvent(&event)) {
if(event.type == SDL_WINDOWEVENT) {
if(event.window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
// ...
}
}
}