ui.hh

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#ifndef bqtTermUI_HH
#define bqtTermUI_HH
#include <string_view>
#include <cstdint>
#include <utility>
#include <variant>
 
#include "keysym.hh"
 
class UI
{
    // Font geometry in pixels
    unsigned VidCellWidth  = 8;
    unsigned VidCellHeight = 16;
    // Window geometry in cells
    unsigned WindowWidth  = 80;
    unsigned WindowHeight = 25;
    bool Headless = false;
 
    bool Allow_Windows_Bigger_Than_Desktop = false;
public:
    UI();
    ~UI();
 
    std::pair<unsigned,unsigned> GetCellSize() const
    {
        return {VidCellWidth,VidCellHeight};
    }
    std::pair<unsigned,unsigned> GetWindowSize() const
    {
        return {WindowWidth,WindowHeight};
    }
    bool IsHeadless() const
    {
        return Headless;
    }
 
    void ResizeTo(unsigned cellx,unsigned celly, unsigned width,unsigned height);
 
    void SetWindowTitle(std::string_view str);
    void SetIconName(std::string_view str);
    void BeepOn();
 
    void PresentGraphics(const std::uint32_t* pixels);
 
    enum resizetype { cellx,celly,winx,winy };
 
    using EventType = std::pair<
        std::string,                    
        std::variant<
            std::pair<int,int>,         
            std::pair<int, resizetype>, 
            bool                        
        >>;
 
    EventType HandleEvents(bool permit_text_input);
 
    void SetHeadless(bool state) { Headless = state; }
 
private:
    // Delete copies
    UI(const UI&) = delete;
    UI(UI&&) = delete;
    UI& operator=(const UI&) = delete;
    UI& operator=(UI&&) = delete;
};
 
extern UI ui;
 
#endif