ParametrizedCommand.cs

using System;
using System.Threading.Tasks;
using System.Windows.Input;
using Waher.Events;
 
namespace LegalLab.Models
{
    public delegate bool CanExecuteParametrizedHandler(object Parameter);
 
    public delegate void ExecuteParametrizedHandler(object Parameter);
 
    public class ParametrizedCommand : ICommand
    {
        private readonly CanExecuteParametrizedHandler canExecuteCallback;
        private readonly ExecuteParametrizedHandler executeCallback;
 
        public ParametrizedCommand(ExecuteParametrizedHandler ExecuteCallback)
            : this(null, ExecuteCallback)
        {
        }
 
        public ParametrizedCommand(CanExecuteParametrizedHandler CanExecuteCallback, ExecuteParametrizedHandler ExecuteCallback)
        {
            this.canExecuteCallback = CanExecuteCallback;
            this.executeCallback = ExecuteCallback;
        }
 
        public event EventHandler CanExecuteChanged;
 
        public void RaiseCanExecuteChanged()
        {
            MainWindow.UpdateGui(() =>
            {
                try
                {
                    this.CanExecuteChanged?.Invoke(this, EventArgs.Empty);
                }
                catch (Exception ex)
                {
                    Log.Exception(ex);
                }
 
                return Task.CompletedTask;
            });
        }
 
        public bool CanExecute(object parameter)
        {
            if (this.canExecuteCallback is null)
                return true;
            else
            {
                try
                {
                    return this.canExecuteCallback(parameter);
                }
                catch (Exception ex)
                {
                    Log.Exception(ex);
                    return false;
                }
            }
        }
 
        public void Execute(object parameter)
        {
            if (this.executeCallback is not null)
            {
                try
                {
                    this.executeCallback(parameter);
                }
                catch (Exception ex)
                {
                    Log.Exception(ex);
                    MainWindow.ErrorBox(ex.Message);
                }
            }
        }
    }
}