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// Copyright © 2017 The CefSharp Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
using System;
using System.Windows.Input;
namespace CefSharp.Wpf.Example
    public class RelayCommand : ICommand
        private readonly Action<object> commandHandler;
        private readonly Func<object, bool> canExecuteHandler;
        public event EventHandler CanExecuteChanged;
        public RelayCommand(Action<object> commandHandler, Func<object, bool> canExecuteHandler = null)
            this.commandHandler = commandHandler;
            this.canExecuteHandler = canExecuteHandler;
        public RelayCommand(Action commandHandler, Func<bool> canExecuteHandler = null)
            : this(_ => commandHandler(), canExecuteHandler == null ? null : new Func<object, bool>(_ => canExecuteHandler()))
        public void Execute(object parameter)
            commandHandler(parameter);
        public bool CanExecute(object parameter)
            return
                canExecuteHandler == null ||
                canExecuteHandler(parameter);
        public void RaiseCanExecuteChanged()
            if (CanExecuteChanged != null)
                CanExecuteChanged(this, EventArgs.Empty);
    public class RelayCommand<T> : RelayCommand
        public RelayCommand(Action<T> commandHandler, Func<T, bool> canExecuteHandler = null)
            : base(o => commandHandler(o is T t ? t : default(T)), canExecuteHandler == null ? null : new Func<object, bool>(o => canExecuteHandler(o is T t ? t : default(T))))

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