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

, 14 Jan 2010
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.
Wex.zip
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
Settings.settings
Reactive
WexEventTrigger.Demo
bin
Debug
WexEventTrigger.Demo.vshost.exe
WexEventTrigger.Demo.vshost.exe.manifest
Commands
Extensions
Properties
Settings.settings
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.Data;

namespace Wex.Lib.Interactions
{
    /// <summary>
    /// A trigger to fire when a property changes
    /// </summary>
    public class PropertyTrigger 
        :   EventBasedTrigger 
    {

        #region Public Properties

        /// <summary>
        /// Name of the property to listen
        /// </summary>
        public string Property
        {
            get { return (string)GetValue(PropertyProperty); }
            set { SetValue(PropertyProperty, value); }
        }

        // Using a DependencyProperty as the backing store for Property.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty PropertyProperty =
            DependencyProperty.Register("Property", typeof(string), typeof(PropertyTrigger), new PropertyMetadata(null,OnParameterChanged));


        #endregion


        /// <summary>
        /// Callback to re-initialize our trigger bindings
        /// </summary>
        /// <param name="d"></param>
        /// <param name="e"></param>
        public static void OnParameterChanged
                (DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
           //Future plans
        }

      

        /// <summary>
        /// Callback invoked when the property changes
        /// </summary>
        /// <param name="dependencyObject"></param>
        /// <param name="eventArgs"></param>
        private void OnListenAttachedPropertyChanged(System.Windows.DependencyObject dependencyObject,
            System.Windows.DependencyPropertyChangedEventArgs eventArgs)
        {
            if (initialized)
            {
                var e=new EventResult() { Sender = dependencyObject, Args = eventArgs };
                this.InvokeConditional(e);
            }
        }


        /// <summary>
        /// Does the initialization
        /// </summary>
        protected override void Initialize()
        {
            if (Source == null)
                throw new InvalidOperationException("Source specified for this trigger is null");
            if (string.IsNullOrEmpty(Property))
                throw new InvalidOperationException("PropertyPath specified for this trigger is null or empty");

            DependencyPropertyHelper.RegisterForNotification<PropertyTrigger>(this,Source,
                Property, OnListenAttachedPropertyChanged);
        }
    }
   
}

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Web02 | 2.8.140721.1 | Last Updated 14 Jan 2010
Article Copyright 2010 by Anoop Madhusudanan
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