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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 Wex.Lib.Reactive;
using System.Collections.Generic;

namespace Wex.Lib.Interactions
{
    /// <summary>
    /// A trigger to fire when an event is raised
    /// </summary>
    public class EventTrigger : ObserverTrigger<IEvent<EventArgs>>
    {

        /// <summary>
        /// The name of the event to hook to
        /// </summary>
        public string EventName
        {
            get { return (string)GetValue(EventNameProperty); }
            set { SetValue(EventNameProperty, value); }
        }

        // Using a DependencyProperty as the backing store for EventName.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty EventNameProperty =
            DependencyProperty.Register("EventName", typeof(string), typeof(EventTrigger), new PropertyMetadata(string.Empty));

        

        /// <summary>
        /// Initializes the observable
        /// </summary>
        protected override void Initialize()
        {
            this.Cleanup();

            if (Source == null) 
                throw new InvalidOperationException("Source specified for this trigger is null");
            if (string.IsNullOrEmpty(EventName)) 
                throw new InvalidOperationException("EventName specified for this trigger is null");

            this.Observable = Wex.Lib.Reactive.ObservableExtensions.FromEvent(Source, EventName);
        }

        /// <summary>
        /// On next action for this observer trigger
        /// </summary>
        /// <param name="param"></param>
        protected override void OnNext(object param)
        {
            var item=param as IEvent<EventArgs>;
            InvokeConditional(new EventResult() 
                { Sender = item.Sender, Args = item.EventArgs });
        }
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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Article Copyright 2010 by Anoop Madhusudanan
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