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WPF Extensibility Hacks or WEX - Includes EventTrigger, ReactiveTrigger, InvokeMethodAction, InvokeCommandAction etc.

, 14 Jan 2010 CPOL
A set of extensibility hacks for WPF. A few interesting triggers and actions, including EventTrigger, ReactiveTrigger, InvokeMethodAction, and InvokeCommandAction. Also allows invoking Triggers and Actions based on Conditions.
Assemblies
Microsoft.Expression.Interactions.dll
System.ComponentModel.Composition.dll
System.CoreEx.dll
System.Interactive.dll
System.Reactive.dll
System.Windows.Interactivity.dll
WexEventTrigger
ClassDiagram1.cd
Wex.csproj.user
bin
Debug
WexEventTrigger.dll
WexEventTrigger.vshost.exe
WexEventTrigger.vshost.exe.manifest
Composition
Lib
Properties
Reactive
WexEventTrigger.Demo
bin
Debug
WexEventTrigger.Demo.vshost.exe
WexEventTrigger.Demo.vshost.exe.manifest
Commands
Extensions
Properties
Views
Demos
using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Interactivity;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Globalization;
using System.Diagnostics;
using System.ComponentModel;

namespace Wex.Lib.Interactions
{
    public abstract class WexAttachableCollection<T> : FreezableCollection<T>, IAttachedObject where T : DependencyObject, IAttachedObject
    {
        // Fields
        private DependencyObject associatedObject;
        private Collection<T> snapshot;

        // Methods
        internal WexAttachableCollection()
        {
            INotifyCollectionChanged changed = this;
            changed.CollectionChanged += new NotifyCollectionChangedEventHandler(this.OnCollectionChanged);
            this.snapshot = new Collection<T>();
        }

        public void Attach(DependencyObject dependencyObject)
        {
            if (dependencyObject != this.AssociatedObject)
            {
                if (this.AssociatedObject != null)
                {
                    throw new InvalidOperationException();
                }
                this.OnAttached();
            }
        }

        public void Detach()
        {
            this.OnDetaching();
            base.WritePreamble();
            this.associatedObject = null;
            base.WritePostscript();
        }

        internal virtual void ItemAdded(T item) {}
        internal virtual void ItemRemoved(T item){}

        protected virtual void OnAttached() { }

        private void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            switch (e.Action)
            {
                case NotifyCollectionChangedAction.Add:
                    foreach (T local in e.NewItems)
                    {
                        try
                        {
                            this.VerifyAdd(local);
                            this.ItemAdded(local);
                            continue;
                        }
                        finally
                        {
                            this.snapshot.Insert(base.IndexOf(local), local);
                        }
                    }
                    break;

                case NotifyCollectionChangedAction.Remove:
                    foreach (T local4 in e.OldItems)
                    {
                        this.ItemRemoved(local4);
                        this.snapshot.Remove(local4);
                    }
                    break;

                case NotifyCollectionChangedAction.Replace:
                    foreach (T local2 in e.OldItems)
                    {
                        this.ItemRemoved(local2);
                        this.snapshot.Remove(local2);
                    }
                    foreach (T local3 in e.NewItems)
                    {
                        try
                        {
                            this.VerifyAdd(local3);
                            this.ItemAdded(local3);
                            continue;
                        }
                        finally
                        {
                            this.snapshot.Insert(base.IndexOf(local3), local3);
                        }
                    }
                    break;

                case NotifyCollectionChangedAction.Move:
                    break;

                case NotifyCollectionChangedAction.Reset:
                    foreach (T local5 in this.snapshot)
                    {
                        this.ItemRemoved(local5);
                    }
                    this.snapshot = new Collection<T>();
                    foreach (T local6 in this)
                    {
                        this.VerifyAdd(local6);
                        this.ItemAdded(local6);
                    }
                    break;

                default:
                    return;
            }
        }

        protected virtual void OnDetaching() { }

        private void VerifyAdd(T item)
        {
            if (this.snapshot.Contains(item))
            {
                throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, "Duplicate item", new object[] { typeof(T).Name, base.GetType().Name }));
            }
        }

 
        // Properties
        protected DependencyObject AssociatedObject
        {
            get
            {
                base.ReadPreamble();
                return this.associatedObject;
            }
        }

        DependencyObject IAttachedObject.AssociatedObject
        {
            get
            {
                return this.AssociatedObject;
            }
        }
    }



}

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