HandlerChain_Exercise.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace DesignPatternExamples_csharp
{
    internal class HandlerChain_Exercise
    {
        void _HandlerChain_ConstructWindowChain(HandlerChain handlerChain)
        {
            // Note: This creates each window and adds the new window to the given
            // HandlerChain object.
            //
            // This example doesn't care about each individual window so the
            // return value is ignored.
            MessageWindow.CreateWindow("Window 1", 0, 0, 10, 10, handlerChain);
            MessageWindow.CreateWindow("Window 2", 20, 0, 5, 5, handlerChain);
            MessageWindow.CreateWindow("Window 3", 30, 10, 15, 15, handlerChain);
        }
 
        // ! [Using HandlerChain in C#]
        public void Run()
        {
            Console.WriteLine();
            Console.WriteLine("Handler Chain Exercise");
 
            // Construct a handler chain and populate with windows that can
            // handle messages.
            HandlerChain handlerChain = new HandlerChain();
            _HandlerChain_ConstructWindowChain(handlerChain);
 
            Console.WriteLine("  Handler Chain at start:");
            Console.WriteLine(handlerChain);
 
            // Now pass messages to the windows.
 
            Console.WriteLine("  Select Window 2");
            handlerChain.SendMessage(new Message(MessageType.ButtonDown, new MessagePosition(22, 1)));
            handlerChain.SendMessage(new Message(MessageType.ButtonUp, new MessagePosition(22, 1)));
            Console.WriteLine("  Current handler chain:");
            Console.WriteLine(handlerChain);
 
            Console.WriteLine("  Select Window 3");
            handlerChain.SendMessage(new Message(MessageType.ButtonDown, new MessagePosition(35, 11)));
            handlerChain.SendMessage(new Message(MessageType.ButtonUp, new MessagePosition(35, 11)));
            Console.WriteLine("  Current handler chain:");
            Console.WriteLine(handlerChain);
 
            Console.WriteLine("  Select Window 1");
            handlerChain.SendMessage(new Message(MessageType.ButtonDown, new MessagePosition(4, 4)));
            handlerChain.SendMessage(new Message(MessageType.ButtonUp, new MessagePosition(4, 4)));
            Console.WriteLine("  Current handler chain:");
            Console.WriteLine(handlerChain);
 
            Console.WriteLine("  Close Window 2");
            handlerChain.SendMessage(new Message(MessageType.ButtonDown, new MessagePosition(24, 0)));
            handlerChain.SendMessage(new Message(MessageType.ButtonUp, new MessagePosition(24, 0)));
            Console.WriteLine("  Current handler chain:");
            Console.WriteLine(handlerChain);
 
            Console.WriteLine("  Done.");
        }
        // ! [Using HandlerChain in C#]
    }
}