[C#] How can I check if current screen is on [Top Menu]? (Done)

[everlaster]

I think the top menu Transform is SuperController.singleton.topWorldUI, so you can probably just check if its gameObject is activeSelf.

An alternative solution to OnGUI - there's a generic way to handle cases where you need a callback for a gameobject being enabled or disabled (among other possible MonoBehaviour event functions):

class UnityEventsListener : MonoBehaviour
{
    public Action enabledHandlers;
    public Action disabledHandlers;

    void OnEnable()
    {
        enabledHandlers?.Invoke();
    }

    void OnDisable()
    {
        disabledHandlers?.Invoke();
    }
}

That can be added as a component to the topWorldUI gameobject, and you can then disable the canvas when the topWorldUI gameobject is enabled and enable when it is disabled:

Canvas _myCanvas;
UnityEventsListener _topWorldUIListener;

public override void Init()
{
    _topWorldUIListener = SuperController.singleton.topWorldUI.gameObject.AddComponent<UnityEventsListener>();
    _topWorldUIListener.enabledHandlers += OnTopWorldUIEnabled;
    _topWorldUIListener.disabledHandlers += OnTopWorldUIDisabled;
}

void OnTopWorldUIEnabled()
{
    SuperController.LogMessage("[INF] I'm here [TopWorldUI] ... ");
    if(this.enabled) // if the plugin is enabled
    {
        _myCanvas.enabled = false;
    }
}

void OnTopWorldUIDisabled()
{
    SuperController.LogMessage("[INF] [TopWorldUI] closed... ");
    if(this.enabled) // if the plugin is enabled
    {
        _myCanvas.enabled = true;
    }
}

void OnDestroy()
{
    if(_topWorldUIListener != null)
    {
        UnityEngine.Object.Destroy(_topWorldUIListener);
    }
}