initial commit

src/page_manager.cpp

@@ -0,0 +1,74 @@
+#include "page_manager.h"
+
+void PageManager::push(AppState& state, std::unique_ptr<Page> page)
+{
+    if (!stack_.empty()) {
+        stack_.back()->onPause(state);
+    }
+    stack_.push_back(std::move(page));
+    stack_.back()->onPush(state);
+}
+
+void PageManager::pop(AppState& state)
+{
+    if (stack_.empty()) return;
+
+    stack_.back()->onPop(state);
+    stack_.pop_back();
+
+    if (!stack_.empty()) {
+        stack_.back()->onResume(state);
+    }
+}
+
+void PageManager::popToRoot(AppState& state)
+{
+    while (stack_.size() > 1) {
+        stack_.back()->onPop(state);
+        stack_.pop_back();
+    }
+    if (!stack_.empty()) {
+        stack_.back()->onResume(state);
+    }
+}
+
+void PageManager::replace(AppState& state, std::unique_ptr<Page> page)
+{
+    if (!stack_.empty()) {
+        stack_.back()->onPop(state);
+        stack_.pop_back();
+    }
+    stack_.push_back(std::move(page));
+    stack_.back()->onPush(state);
+}
+
+Page* PageManager::current() const
+{
+    return stack_.empty() ? nullptr : stack_.back().get();
+}
+
+std::size_t PageManager::depth() const
+{
+    return stack_.size();
+}
+
+void PageManager::handleEvent(const SDL_Event& event)
+{
+    if (!stack_.empty()) {
+        stack_.back()->handleEvent(event);
+    }
+}
+
+void PageManager::update(float dt)
+{
+    if (!stack_.empty()) {
+        stack_.back()->update(dt);
+    }
+}
+
+void PageManager::render(SDL_Renderer* renderer)
+{
+    if (!stack_.empty()) {
+        stack_.back()->render(renderer);
+    }
+}