void Application::Handle(const SDL_Event &event) {
switch (event.type) {
- case SDL_QUIT:
- env.state.PopAll();
- break;
case SDL_WINDOWEVENT:
Handle(event.window);
break;
void Application::PushState(State *s) {
+ if (!states.empty()) {
+ states.top()->OnPause();
+ }
states.emplace(s);
+ ++s->ref_count;
+ if (s->ref_count == 1) {
+ s->OnEnter();
+ }
+ s->OnResume();
}
State *Application::PopState() {
State *s = states.top();
states.pop();
+ s->OnPause();
+ s->OnExit();
+ if (!states.empty()) {
+ states.top()->OnResume();
+ }
return s;
}
State *Application::SwitchState(State *s_new) {
State *s_old = states.top();
states.top() = s_new;
+ --s_old->ref_count;
+ ++s_new->ref_count;
+ s_old->OnPause();
+ if (s_old->ref_count == 0) {
+ s_old->OnExit();
+ }
+ if (s_new->ref_count == 1) {
+ s_new->OnEnter();
+ }
+ s_new->OnResume();
return s_old;
}