DisplayElement.hpp

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#pragma once
 
#include <Display/DisplayInterface.hpp>
#include <AH/Containers/LinkedList.hpp>
 
BEGIN_CS_NAMESPACE
 
class DisplayElement : public DoublyLinkable<DisplayElement> {
  protected:
    DisplayElement(DisplayInterface &display) : display(display) {
        // The elements are sorted by the address of their displays.
        // This way, all display elements that draw to the same display are next
        // to each other. This means that the display buffer can be reused.
        elements.insertSorted(
            this, [](const DisplayElement &lhs, const DisplayElement &rhs) {
                return &lhs.getDisplay() < &rhs.getDisplay();
            });
    }
 
  public:
    virtual ~DisplayElement() { elements.remove(this); }
 
    virtual void draw() = 0;
 
    DisplayInterface &getDisplay() { return display; }
    const DisplayInterface &getDisplay() const { return display; }
 
    static DoublyLinkedList<DisplayElement> &getAll() { return elements; }
 
  protected:
    DisplayInterface &display;
 
    static DoublyLinkedList<DisplayElement> elements;
};
 
END_CS_NAMESPACE