Canvas.h

#ifndef Canvas_H
#define Canvas_H
 
#include "AzulCore.h"
#include "../Inputable/Inputable.h"
#include "../Drawable/Drawable.h"
#include "../Updatable/Updatable.h"
#include <vector>
 
class UIComponent;

class Canvas : public Drawable, public Inputable, public Updatable
{
public:
    Canvas();
    Canvas(const Canvas&) = delete;
    Canvas& operator=(const Canvas&) = delete;
    ~Canvas();

    void AddComponent(UIComponent* component);

    void RemoveComponent(UIComponent* component);

    void SetEnabled(bool e);

    bool IsEnabled() const;
 
private:
    friend class UIAttorney;
 
    std::vector<UIComponent*> components; 
 
    // Map: Layer index -> vector of components in that layer
    std::map<int, std::vector<UIComponent*>> layerMap;
    // For fast removal: component pointer -> layer index
    std::map<UIComponent*, int> componentLayerLookup;
    // Flag to indicate if the canvas is enabled
    bool enabled;
 
    // Call this if you change a component's layer after adding it
    void OnComponentLayerChanged(UIComponent* component, int oldLayer, int newLayer);

    void Update() override;

    void Draw2D() override;

    void MousePress(AZUL_MOUSE m) override;

    void MouseHeld(AZUL_MOUSE m) override;

    void MouseRelease(AZUL_MOUSE m) override;

    void HandleMouseInput();

    void HandleHeldMouseInput();

    void HandleScroll();

    void HandleMouseReleaseInput();

    void HandleHover();
};
 
#endif