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https://github.com/rwengine/openrw.git
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74 lines
1.5 KiB
C++
74 lines
1.5 KiB
C++
#ifndef RWGAME_STATEMANAGER_HPP
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#define RWGAME_STATEMANAGER_HPP
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#include "State.hpp"
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#include <memory>
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#include <queue>
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/**
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* @brief Handles current state focus and transitions
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*
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* Possible states:
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* Foreground (topmost state)
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* Background (any other position)
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*
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* Transitions:
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* New State (at the top)
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* Suspended (a state was created above us)
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* Resumed (blocking state was removed)
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*/
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class StateManager {
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public:
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std::deque<std::unique_ptr<State>> states;
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void clear() {
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cleared = true;
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}
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template <class T, class... Targs>
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void enter(Targs&&... args) {
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// Notify the previous state it has been suspended
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if (!states.empty()) {
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states.back()->exit();
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}
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states.emplace_back(std::move(std::make_unique<T>(args...)));
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states.back()->enter();
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}
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void updateStack() {
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if (cleared) {
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states.clear();
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cleared = false;
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}
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while (!states.empty() && states.back()->hasExited()) {
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states.back()->exit();
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states.pop_back();
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if (!states.empty()) {
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states.back()->enter();
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}
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}
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}
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void tick(float dt) {
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states.back()->tick(dt);
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}
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void draw(GameRenderer& r) {
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states.back()->draw(r);
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}
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State* currentState() {
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if (states.empty()) {
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return nullptr;
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}
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return states.back().get();
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}
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private:
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bool cleared = false;
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};
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#endif
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