sasalka/Code/Player/Dedugan.Interaction.cs

using Sandbox;
using Sandbox.Utility;
using Sandbox.Diagnostics;
using System.Linq;

public sealed partial class Dedugan : Component
{
    public Component Pressed { get; set; }
    public bool EnablePressing { get; set; } = true;
    public Component Hovered { get; set; }

    [Sync(SyncFlags.Interpolate)]
    public Vector3 TracedHitPos { get; set; }
    [Sync]
    public bool CameraTraceIsHit { get; set; }
    public Vector3 TracedHitNormal { get; set; }

    // private TimeSince HoldTime = 0;
    // private bool Holding = false;
    // private bool HoldingInteractionHappened = false;

    void InteractionsUpdate()
    {
        if (!EnablePressing)
        {
            // Holding = false;
            // HoldingInteractionHappened = false;
            return;
        }

        if (Pressed.IsValid())
        {
            UpdatePressed();
        }
        else
        {
            UpdateHovered();
        }
    }

    private void UpdatePressed()
    {
        bool flag = Input.Down("use");

        if (flag && Pressed.Components.TryGet<IPressable>(out var pressable))
        {
            flag = pressable.Pressing(new IPressable.Event
            {
                Ray = new Ray(Camera.WorldPosition, EyeAngles.ToRotation().Forward),
                Source = this
            });
        }

        if (GetDistanceFromGameObject(Pressed.GameObject, Camera.WorldPosition) > InteractDistance)
        {
            flag = false;
        }

        if (!flag)
        {
            StopPressing();
        }
    }

    private void UpdateHovered()
    {
        SwitchHovered(TryGetLookedAt());

        if (Hovered is IPressable pressable)
        {
            pressable.Look(new IPressable.Event
            {
                Ray = new Ray(Camera.WorldPosition, EyeAngles.ToRotation().Forward),
                Source = this
            });
        }

        if (Input.Down("use"))
        {
            StartPressing(Hovered);
        }
    }

    public void StartPressing(Component obj)
    {
        StopPressing();
        if (!obj.IsValid())
        {
            ISceneEvent<PlayerController.IEvents>.PostToGameObject(GameObject, x => x.FailPressing());
            return;
        }

        var component = obj.Components.Get<IPressable>(FindMode.EnabledInSelfAndDescendants);
        if (component != null)
        {
            var pressEvent = new IPressable.Event
            {
                Ray = new Ray(Camera.WorldPosition, EyeAngles.ToRotation().Forward),
                Source = this
            };

            if (!component.CanPress(pressEvent))
            {
                ISceneEvent<PlayerController.IEvents>.PostToGameObject(GameObject, x => x.FailPressing());
                return;
            }

            component.Press(pressEvent);
        }

        Pressed = obj;

        if (Pressed.IsValid())
        {
            ISceneEvent<PlayerController.IEvents>.PostToGameObject(GameObject, x => x.StartPressing(Pressed));
        }
    }

    public void StopPressing()
    {
        if (Pressed.IsValid())
        {
            ISceneEvent<PlayerController.IEvents>.PostToGameObject(GameObject, x => x.StopPressing(Pressed));

            if (Pressed is IPressable pressable)
            {
                pressable.Release(new IPressable.Event
                {
                    Ray = new Ray(Camera.WorldPosition, EyeAngles.ToRotation().Forward),
                    Source = this
                });
            }

            Pressed = null;
        }
    }

    private void SwitchHovered(Component obj)
    {
        var e = new IPressable.Event
        {
            Ray = new Ray(Camera.WorldPosition, EyeAngles.ToRotation().Forward),
            Source = this
        };

        if (Hovered == obj)
        {
            if (Hovered is IPressable pressable)
                pressable.Look(e);
            return;
        }

        if (Hovered is IPressable oldPressable)
            oldPressable.Blur(e);

        Hovered = obj;

        if (Hovered is IPressable newPressable)
        {
            newPressable.Hover(e);
            newPressable.Look(e);
        }
    }

    private Component TryGetLookedAt()
    {
        for (float num = 0f; num <= 4f; num += 2f)
        {
            var from = Scene.Camera.WorldPosition + Scene.Camera.WorldRotation.Forward;
            var to = from + Scene.Camera.WorldRotation.Forward * (InteractDistance - num);
            var trace = Scene.Trace.Ray(from, to).IgnoreGameObjectHierarchy(GameObject).Radius(num).Run();

            TracedHitPos = trace.Hit ? trace.HitPosition : trace.EndPosition;
            CameraTraceIsHit = trace.Hit;
            TracedHitNormal = trace.Normal;

            if (!trace.Hit || !trace.GameObject.IsValid()) continue;

            Component foundComponent = null;

            ISceneEvent<PlayerController.IEvents>.PostToGameObject(GameObject, x =>
            {
                foundComponent = x.GetUsableComponent(trace.GameObject) ?? foundComponent;
            });

            if (foundComponent.IsValid()) return foundComponent;

            foreach (var component in trace.GameObject.Components.GetAll<IPressable>())
            {
                if (component.CanPress(new IPressable.Event
                {
                    Ray = new Ray(Camera.WorldPosition, EyeAngles.ToRotation().Forward),
                    Source = this
                }))
                {
                    return component as Component;
                }
            }
        }

        return null;
    }

    private float GetDistanceFromGameObject(GameObject obj, Vector3 point)
    {
        Vector3 closest = obj.WorldPosition;
        float minDist = Vector3.DistanceBetween(closest, point);

        foreach (var col in Pressed.GetComponentsInChildren<Collider>())
        {
            Vector3 cp = col.FindClosestPoint(point);
            float dist = Vector3.DistanceBetween(cp, point);
            if (dist < minDist)
                minDist = dist;
        }

        return minDist;
    }
}