AllCommand.cs :  » Windows-Presentation-Foundation » Caliburn » CompositeCommands » Framework » C# / CSharp Open Source

Home
C# / CSharp Open Source
1.2.6.4 mono .net core
2.2.6.4 mono core
3.Aspect Oriented Frameworks
4.Bloggers
5.Build Systems
6.Business Application
7.Charting Reporting Tools
8.Chat Servers
9.Code Coverage Tools
10.Content Management Systems CMS
11.CRM ERP
12.Database
13.Development
14.Email
15.Forum
16.Game
17.GIS
18.GUI
19.IDEs
20.Installers Generators
21.Inversion of Control Dependency Injection
22.Issue Tracking
23.Logging Tools
24.Message
25.Mobile
26.Network Clients
27.Network Servers
28.Office
29.PDF
30.Persistence Frameworks
31.Portals
32.Profilers
33.Project Management
34.RSS RDF
35.Rule Engines
36.Script
37.Search Engines
38.Sound Audio
39.Source Control
40.SQL Clients
41.Template Engines
42.Testing
43.UML
44.Web Frameworks
45.Web Service
46.Web Testing
47.Wiki Engines
48.Windows Presentation Foundation
49.Workflows
50.XML Parsers
C# / C Sharp
C# / C Sharp by API
C# / CSharp Tutorial
C# / CSharp Open Source » Windows Presentation Foundation » Caliburn 
Caliburn » CompositeCommands » Framework » AllCommand.cs
namespace CompositeCommands.Framework{
    using System;
    using System.Collections.Generic;
    using Caliburn.PresentationFramework;
    using Caliburn.PresentationFramework.Commands;
    using Caliburn.PresentationFramework.Filters;

    /// <summary>
    /// An <see cref="ICompositeCommand"/> whose children must all be available in order to execute.
    /// </summary>
    public class AllCommand : PropertyChangedBase, ICompositeCommand
    {
        private readonly WeakKeyedDictionary<CommandMessage, bool?> _children =
            new WeakKeyedDictionary<CommandMessage, bool?>();

        private bool _isAvailable = true;

        /// <summary>
        /// Gets a value indicating whether this instance is available.
        /// </summary>
        /// <value>
        ///   <c>true</c> if this instance is available; otherwise, <c>false</c>.
        /// </value>
        public bool IsAvailable
        {
            get { return _isAvailable; }
        }

        /// <summary>
        /// Executes this instance.
        /// </summary>
        [Preview("CanExecute")]
        [Dependencies("IsAvailable")]
        public void Execute()
        {
            _children.RemoveCollectedEntries();

            var commands = new List<CommandMessage>(_children.Keys);

            foreach(var command in commands)
            {
                command.Completed += Command_Completed;
                _children[command] = null;
            }

            DetermineAvailability();

            foreach(var command in commands)
            {
                command.Process(command, null);
            }
        }

        private void Command_Completed(object sender, EventArgs e)
        {
            var message = (CommandMessage)sender;

            message.Completed -= Command_Completed;

            if(_children[message] == null)
                _children[message] = true;

            DetermineAvailability();
        }

        /// <summary>
        /// Determines whether this instance can execute.
        /// </summary>
        /// <returns>
        ///   <c>true</c> if this instance can execute; otherwise, <c>false</c>.
        /// </returns>
        public bool CanExecute()
        {
            return IsAvailable;
        }

        /// <summary>
        /// Adds or updates the child command.
        /// </summary>
        /// <param name="child">The child.</param>
        /// <param name="availability">if set to <c>true</c> the child can execute.</param>
        public void AddOrUpdateChild(CommandMessage child, bool availability)
        {
            _children[child] = availability;

            DetermineAvailability();
        }

        /// <summary>
        /// Removes the child.
        /// </summary>
        /// <param name="child">The child.</param>
        public void RemoveChild(CommandMessage child)
        {
            _children.Remove(child);

            DetermineAvailability();
        }

        private void DetermineAvailability()
        {
            _children.RemoveCollectedEntries();
            _isAvailable = true;

            foreach(var state in _children.Values)
            {
                if(!state.GetValueOrDefault(false))
                {
                    _isAvailable = false;
                    break;
                }
            }

            NotifyOfPropertyChange("IsAvailable");
        }
    }
}
www.java2v.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.