EventSubscription

//////////////////////////////////
//                              //
//  EVENT SUBSCRIPTION EXAMPLE  //
//                              //
//////////////////////////////////

using System;

namespace RenegadeCore
{
    public partial class Weather
    {
        //This is called by the core weather system from other parts of the game.
        [GeneratesEvent("SpawnWeatherCheck")]
        public bool SpawnWeather(Weather weather, ChunkColumn column)
        {
            if(column.HasWeather())
                return;
        }
    }
}


namespace AwesomeMod
{
    public partial class ArceusThunderstorm
    {
        public int ThunderstormCount { get; protected set; }

        public ArceusThunderstorm()
        {
            ThunderstormCount = 0;
        }

        [PrependEvent("SpawnWeatherCheck", Priority.Highest)]
        public bool PreWeatherSpawn(Weather weather, ChunkColumn column)
        {
            if(ThunderstormCount >= 100)
            {
                SpawnArceus(column.zero);
                ThunderstormCount = 0;
                return false;
            }

            return true;
        }

        [AppendEvent("SpawnWeatherCheck")]
        public void PostWeatherSpawn(Weather weather, ChunkColumn column)
        {
            ThunderstormCount++;
        }
    }
}

//results in:
using System;

namespace RenegadeCore
{
    public partial class Weather
    {
        public class SpawnWeatherCheckEventArgs : XGEFEventArgs
        {
            public Weather weather { get; set; }
            public ChunkColumn column { get; set; }
        }

        //This is called by the core weather system from other parts of the game.
        public void SpawnWeather(Weather weather, ChunkColumn column)
        {
            //Automatically inserted
            SpawnWeatherCheckEventArgs args = new SpawnWeatherCheckEventArgs() { weather = weather, column = column };
            args = XGEF.Events.EventHandler.Instance.InvokeEvent(this, args);
            if(args.Cancel)
                return;

            if(column.HasWeather())
                return;

            //Automatically inserted
            XGEF.Events.EventHandler.Instance.InvokePostEvent("SpawnWeatherCheck", this, args);
        }

        //Automatically generated if it didn't exist
        public Weather()
        {
            XGEF.Events.EventHandler.Instance.CreateEvent("SpawnWeatherCheck", this, "WeatherMod", SpawnWeatherCheckEventArgs);
        }
    }
}

namespace AwesomeMod
{
    public partial class ArceusThunderstorm
    {
        public int ThunderstormCount { get; protected set; }

        public ArceusThunderstorm()
        {
            ThunderstormCount = 0;
            //Automatically inserted
            XGEF.Events.EventHandler.Instance.RegisterPreEvent("SpawnWeatherCheck", PreWeatherSpawn, Priority.Highest);
            XGEF.Events.EventHandler.Instance.RegisterPostEvent("SpawnWeatherCheck", PostWeatherSpawn, Priority.Normal);
        }

        public void PreWeatherSpawn(Weather weather, ChunkColumn column)
        {
            if(ThunderstormCount >= 100)
            {
                SpawnArceus(column.zero);
                ThunderstormCount = 0;
                args.Cancel = true;
                return;
            }
            args.Cancel = false;
            return;
        }

        public void PostWeatherSpawn(Weather weather, ChunkColumn column)
        {
            ThunderstormCount++;
        }
    }
}