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

, 14 Jan 2010 CPOL 18.3K 236 24
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.Collections.Generic;
using System.Windows.Markup;
using System.Linq;

namespace Wex.Lib.Interactions
{
    /// <summary>
    /// An action to invoke an ICommand in the view model
    /// </summary>
    [ContentProperty("Parameters")]     
    public class InvokeCommandAction
        : TargettedTriggerAction
    {
            public string CommandName
            {
                get { return (string)GetValue(CommandNameProperty); }
                set { SetValue(CommandNameProperty, value); }
            }

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


            /// <summary>
            /// A set of parameters this method will take
            /// </summary>
            public ActionParameters Parameters
            {
                get { return (ActionParameters)GetValue(MethodParametersProperty); }
                set { SetValue(MethodParametersProperty, value); }
            }

            // Using a DependencyProperty as the backing store for Conditions.  This enables animation, styling, binding, etc...
            public static readonly DependencyProperty MethodParametersProperty =
                DependencyProperty.Register("Parameters", typeof(ActionParameters), typeof(InvokeCommandAction), new PropertyMetadata(null));


           

            /// <summary>
            /// Invoke this command conditionally
            /// </summary>
            /// <param name="parameter"></param>
            internal override void InvokeConditional(object parameter)
            {

                if (Target != null)
                {
                    var prop = Target.GetType().GetProperty(CommandName);
                    if (prop == null) throw new InvalidOperationException("Unable to find Command " + CommandName);
                    var cmd = prop.GetValue(Target, null) as ICommand;
                    if (cmd == null) throw new InvalidOperationException("The Command " + CommandName + " is not an ICommand");

                    List<object> ps = new List<object>();
                    object cmdparams = null;

                    if (Parameters != null)
                    {
                        if (Parameters.Count > 1)
                        {
                            foreach (var p in Parameters)
                                ps.Add(p.PropertyValue);
                            cmdparams = ps.ToArray();
                        }
                        else if (Parameters.Count == 1)
                        {
                            cmdparams = Parameters[0].PropertyValue;
                        }

                    }

                    if (cmd.CanExecute(cmdparams))
                        cmd.Execute(cmdparams);

                }
            }

            internal override void InternalInitialize()
            {
                base.InternalInitialize();

                if (Parameters != null)
                {
                    Parameters.ToList().ForEach(p =>
                    { p.TriggerContext = TriggerContext; p.AssociatedObject = this.AssociatedObject; p.InternalInitialize(); });
                }
            }

    }
}

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Web04 | 2.8.150804.4 | Last Updated 14 Jan 2010
Article Copyright 2010 by Anoop Madhusudanan
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