MouseEvent.hpp

// Copyright 2020 Pokitec
// All rights reserved.
 
#pragma once
 
#include "TTauri/Foundation/vec.hpp"
#include "TTauri/Foundation/hires_utc_clock.hpp"
#include "TTauri/GUI/MouseButtons.hpp"
 
namespace tt {
 
struct MouseEvent {
    enum class Type { None, Entered, Exited, Move, Drag, ButtonDown, ButtonUp };
 
    Type type;
 
    hires_utc_clock::time_point timePoint;
 
    vec position;
 
    vec downPosition;
 
    MouseButtons cause;
 
    MouseButtons down;
 
    int clickCount;
 
    MouseEvent() noexcept :
        type(Type::None),
        position(),
        cause(),
        down(),
        clickCount(0)
    {
    }
 
    static MouseEvent entered(vec position=vec::point(0.0f, 0.0f)) noexcept {
        MouseEvent event;
        event.position = position;
        event.type = MouseEvent::Type::Entered;
        return event;
    }
    static MouseEvent exited() noexcept {
        // Position far away from the left/bottom corner, but where even
        // after translations will not cause the position to be infinite.
        constexpr float far_ = std::numeric_limits<float>::max() * -0.5f;
 
        MouseEvent event;
        event.position = vec{far_, far_};
        event.type = MouseEvent::Type::Exited;
        return event;
    }
 
    friend std::string to_string(MouseEvent const &rhs) noexcept {
        char const *type_s;
        switch (rhs.type) {
        case MouseEvent::Type::None: type_s = "none"; break;
        case MouseEvent::Type::Entered: type_s = "entered"; break;
        case MouseEvent::Type::Exited: type_s = "exited"; break;
        case MouseEvent::Type::Move: type_s = "move"; break;
        case MouseEvent::Type::Drag: type_s = "drag"; break;
        case MouseEvent::Type::ButtonDown: type_s = "down"; break;
        case MouseEvent::Type::ButtonUp: type_s = "up"; break;
        default: tt_no_default;
        }
 
        return fmt::format("<mouse {} {}>", type_s, rhs.position);
    }
 
    friend std::ostream &operator<<(std::ostream &lhs, MouseEvent const &rhs) {
        return lhs << to_string(rhs);
    }
};
 
 
 
}