UI_Manager.h

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#ifndef UI_MANAGER_H_
#define UI_MANAGER_H_
 
#include "UIElement.h"
 
#define UI_LIB_DEFAULT_COLOR_BACKGROUND             RGB565(0x00, 0x00, 0x00)            
#define UI_LIB_DEFAULT_COLOR_FOREGROUND             RGB565(0xFF, 0xFF, 0xFF)              
#define UI_LIB_DEFAULT_COLOR_FOREGROUND_EDIT_MODE   UI_LIB_DEFAULT_COLOR_BACKGROUND         
#define UI_LIB_DEFAULT_COLOR_FOCUS_FRAME            UI_LIB_DEFAULT_COLOR_FOREGROUND     
#define UI_LIB_DEFAULT_FONT                         &FreeSans12pt7b                     
#define UI_LIB_DEFAULT_ELEMENT_MARGIN               2                                   
#define UI_LIB_DEFAULT_ELEMENT_PADDING              3                                   

class UI_Manager
{
    private:
        UIElement* _visualTreeRoot;                 
        UIElement* _focusElement;                 
        UIElement* _lastDrawnFocusElement;           
        
        UIElement* _lastElementInEditMode = NULL;    

        void setFocusToLeaf();

        UI_Manager();
 
    public:
        uint16_t ColorBackground;                    
        uint16_t ColorForeground;                     
        uint16_t ColorForegroundEditMode;                
        uint16_t ColorFocusFrame;                    
        const GFXfont* Font;                        
        uint16_t FontHeight;                      
        uint16_t ElementMargin;                        
        uint16_t ElementPadding;                  
        bool CompleteRedrawRequested;                
        Adafruit_GFX* Gfx;                           
        bool AreVirtualKeysShown;                    

        static UI_Manager& getInstance()
        {
            static UI_Manager instance;   // Instantiated on first use.
            return instance;
        }

        void Init(Adafruit_GFX* gfx);

        void SetColors(uint16_t colorBackground = UI_LIB_DEFAULT_COLOR_BACKGROUND, uint16_t colorForeground = UI_LIB_DEFAULT_COLOR_FOREGROUND, uint16_t colorForegroundEditMode = UI_LIB_DEFAULT_COLOR_FOREGROUND_EDIT_MODE, uint16_t colorFocusFrame = UI_LIB_DEFAULT_COLOR_FOCUS_FRAME);

        void SetFont(const GFXfont* font);

        void Draw();

        void ChangeVisualTreeRoot(UIElement* visualTreeRoot);
        
        UIElement* GetVisualTreeRoot();

        bool KeyInput(Keys_t key);

        bool TouchInput(uint16_t x, uint16_t y, TouchTypes touchType);

        void UpdateIsInEditModeElement(UIElement* element, bool newEditModeState);
};
 
extern UI_Manager UiManager;         
 
#endif /* UI_MANAGER_H_ */