LayerStack.h

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#pragma once

 
#include <quasar/core/Base.h>
#include <quasar/core/Layer.h>
#include <quasar/events/Event.h>
 
#include <cstddef>
#include <vector>
 
namespace Quasar
{
    class LayerStack
    {
    public:
        using Iterator = std::vector<Scope<Layer>>::iterator;

        using ConstIterator = std::vector<Scope<Layer>>::const_iterator;
 
        LayerStack() = default;

        ~LayerStack();
 
        LayerStack(const LayerStack&) = delete;
        LayerStack& operator=(const LayerStack&) = delete;
        LayerStack(LayerStack&&) = delete;
        LayerStack& operator=(LayerStack&&) = delete;

        Layer& PushLayer(Scope<Layer> layer);

        Layer& PushOverlay(Scope<Layer> overlay);

        Scope<Layer> PopLayer(Layer& layer);

        Scope<Layer> PopOverlay(Layer& overlay);

        void OnEvent(Event& event);

        void Clear();

        std::size_t GetSize() const { return m_Layers.size(); }

        Iterator begin() { return m_Layers.begin(); }

        Iterator end() { return m_Layers.end(); }

        ConstIterator begin() const { return m_Layers.begin(); }

        ConstIterator end() const { return m_Layers.end(); }
 
    private:
        std::vector<Scope<Layer>> m_Layers;
        std::size_t m_OverlayStart = 0;
    };
}