using Autodesk.Revit.UI;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FWindSoft.Revit
{
    /// <summary>
    /// 处理者，就是接收者
    /// </summary>
    public class RevitHandler : IExternalEventHandler
    {
        public RevitHandler() : this(Guid.NewGuid().ToString("N"))
        {
        }
        public RevitHandler(string name)
        {
            this.Name = name;
        }
        public RevitHandler(string name, Action<RevitEventArgs> action) : this(name)
        {
            if (action != null)
            {
                Executing += (s, e) => action(e);
            }
        }
        public RevitHandler(Action<RevitEventArgs> action) : this(Guid.NewGuid().ToString("N"), action)
        {
        }
        #region 接口逻辑实现
        public void Execute(UIApplication app)
        {
            this.UIApp = app;
            var args = new RevitEventArgs();
            args.UIApp = this.UIApp;
            args.Handler = this;
            OnPreExecute(args);
            if (args.Handled)
                return;
            OnExecute(args);
            if (args.Handled)
                return;
            OnPostExecute(args);
        }
        /// <summary>
        /// 命令名称
        /// </summary>
        public string Name { get; protected set; }
        public string GetName()
        {
            return Name;
        }
        #endregion

        /// <summary>
        /// 关联UIApp
        /// </summary>
        public UIApplication UIApp { get; private set; }
        #region 事件处理相关
        public event EventHandler<RevitEventArgs> PreExecute;      
        public event EventHandler<RevitEventArgs> Executing;
        public event EventHandler<RevitEventArgs> PostExecute;
        public virtual void OnExecute(RevitEventArgs args)
        {
            if (Executing != null)
            {
                Executing(this, args);
            }
        }
        protected virtual void OnPreExecute(RevitEventArgs args)
        {
            if (PreExecute != null)
            {
                PreExecute(this, args);
            }
        }
        protected virtual void OnPostExecute(RevitEventArgs args)
        {
            if (PostExecute != null)
            {
                PostExecute(this, args);
            }
        }
        #endregion
        /// <summary>
        /// 关联参数
        /// </summary>
        public object Parameter { get; set; }
    }
}