Graphics window freezes when minimizing, maximizing or quitting

SDL Development
1

Hello there, I’ve recently encountered a problem where my graphics window (besides the console output) freezes and becomes unusable after minimizing, maximizing, closing (attempt), or dragging it.

My program is wrapped in a structure where there is a “Main.cpp” file which contains a “while-loop” that stops running if the boolean “isRunning” is set to false.
This loop continuously calls the “handleEvents” method in another file.
The “handleEvents” method looks like this.

//Aforementioned while-loop
while (game->running()) {
		game->setFrameStart();

		game->handleEvents();
		game->update();
		game->render();

		game->computeFrameTime();

		game->runFrameDelay();
	}
//HandleEvents Method
void Game::handleEvents() {

	SDL_Event event;
	SDL_PollEvent(&event);

	if (event.type == SDL_QUIT) {
		isRunning = false;
		SDL_DestroyWindow(window);
		printf("Quitting");
	}

}

I’ve been in forums where people have encountered similar problems caused by them not polling events properly or not at all, but as seen above, I am indeed doing so.
Furthermore I’ve not been able to find any articles at all that match my problem.

I would greatly appreciate any help, also this is my first post here, so please, if I did something wrong do remind me of it.

2

Which is your platform? (Windows, Mac, Linux, HTML5, …)

Generally speaking, it is recommended to process multiple events at once by putting SDL_PollEvent inside a loop as we can see in SDL_PollEvent - SDL Wiki' It seems your runFrameDelay() function waiting for a frame for each single events; but events can happen multiple times in a frame.

I guess the first thing that needs to be ensured is making sure we’re calling SDL_PollEvent. I’d insert some printf()s to ensure we’re still calling SDL_PollEvent() correctly on that case.

3

Like @OKUMURA_Yuki said, multiple events can come in each frame, so change your code to

void Game::handleEvents() {

	SDL_Event event;
	while(SDL_PollEvent(&event)) {
		if (event.type == SDL_QUIT) {
			isRunning = false;
			SDL_DestroyWindow(window);
			printf("Quitting");
		}
	}
}
4

@OKUMURA_Yuki @sjr
I took in both of your ideas and it works now! I highly appreciate it and cheers!