drag.h

#pragma once

#include "anim.h"
#include "input.h"
#include "layout.h"
#include "view.h"

namespace Karm::Ui {

// MARK: Drag Event ------------------------------------------------------------

struct DragEvent {
    enum {
        START,
        DRAG,
        END
    } type;

    Math::Vec2i delta{};
};

// MARK: Dismisable ------------------------------------------------------------

enum struct DismisDir {
    LEFT = 1 << 0,
    RIGHT = 1 << 1,
    TOP = 1 << 2,
    DOWN = 1 << 3,

    HORIZONTAL = LEFT | RIGHT,
    VERTICAL = TOP | DOWN,
};

FlagsEnum$(DismisDir);

using OnDismis = Func<void(Node&)>;

Child dismisable(OnDismis onDismis, DismisDir dir, f64 threshold, Ui::Child child);

inline auto dismisable(OnDismis onDismis, DismisDir dir, f64 threshold) {
    return [=, onDismis = std::move(onDismis)](Ui::Child child) mutable {
        return dismisable(std::move(onDismis), dir, threshold, child);
    };
}

// MARK: Drag Region -----------------------------------------------------------

Child dragRegion(Child child, Math::Vec2i dir = {1, 1});

inline auto dragRegion(Math::Vec2i dir = {1, 1}) {
    return [dir](Child child) {
        return dragRegion(child, dir);
    };
}

// MARK: Handle ----------------------------------------------------------------

Child handle();

Child dragHandle();

Child buttonHandle(OnPress press);

} // namespace Karm::Ui