81 lines
1.9 KiB
C++
81 lines
1.9 KiB
C++
#include "screen.h"
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// standard library includes
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#include <cassert>
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#ifndef NDEBUG
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#include <iostream>
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#endif // NDEBUG
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// local includes
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#include "screen_test.h"
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Screen::Screen(std::weak_ptr<ScreenStack> stack) : stack(stack) {}
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ScreenStack::PendingAction::PendingAction() : screen(), action(Action::NOP) {}
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ScreenStack::PendingAction::PendingAction(Action action)
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: screen(), action(action) {}
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ScreenStack::PendingAction::PendingAction(Screen::Ptr &&screen)
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: screen(std::forward<Screen::Ptr>(screen)), action(Action::PUSH_SCREEN) {}
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ScreenStack::Ptr ScreenStack::new_instance() {
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std::shared_ptr<ScreenStack> ptr =
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std::shared_ptr<ScreenStack>(new ScreenStack{});
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ptr->self_weak = ptr;
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return ptr;
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}
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void ScreenStack::update(float dt) {
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handle_pending_actions();
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auto idx = stack.size();
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if (idx == 0) {
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#ifndef NDEBUG
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std::cerr << "WARNING: Stack is empty, pushing TestScreen...\n";
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#endif // NDEBUG
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push_screen(Screen::new_screen<TestScreen>(self_weak));
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update(dt);
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return;
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}
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while (idx > 0 && stack.at(--idx)->update(dt)) {
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}
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}
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void ScreenStack::draw() {
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auto idx = stack.size();
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while (idx > 0 && stack.at(--idx)->draw()) {
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}
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}
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void ScreenStack::push_screen(Screen::Ptr &&screen) {
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actions.push_back(PendingAction(std::forward<Screen::Ptr>(screen)));
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}
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void ScreenStack::pop_screen() {
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actions.push_back(PendingAction(Action::POP_SCREEN));
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}
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ScreenStack::ScreenStack() : self_weak(), stack(), actions() {}
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void ScreenStack::handle_pending_actions() {
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while (!actions.empty()) {
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switch (actions.front().action) {
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case Action::PUSH_SCREEN:
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stack.push_back(std::move(actions.front().screen));
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break;
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case Action::POP_SCREEN:
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if (!stack.empty()) {
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stack.pop_back();
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}
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break;
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case Action::NOP:
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// Intentionally left blank.
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break;
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default:
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assert(!"unreachable");
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break;
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}
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actions.pop_front();
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}
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}
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