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A Sample Silverlight 4 Application Using MEF, MVVM, and WCF RIA Services - Part 1

, 7 Jul 2011 CPOL
Part 1 of a series describing the creation of a Silverlight business application using MEF, MVVM Light, and WCF RIA Services.
IssueVisionforSilverlightSetup20110630.zip
IssueVision for Silverlight Setup
IssueVisionSetup.msi
setup.exe
IssueVision_for_Silverlight_setup.zip
IssueVisionSetup.msi
setup.exe
IssueVision_Silverlight20110630.zip
IssueVision.Silverlight
Assemblies
GalaSoft.MvvmLight.Extras.SL4.dll
GalaSoft.MvvmLight.SL4.dll
MenuControls.dll
System.Windows.Controls.DataVisualization.Toolkit.dll
System.Windows.Controls.Toolkit.dll
System.Windows.Controls.Toolkit.Internals.dll
System.Windows.Interactivity.dll
Database
IssueVision.Client
IssueVision.Client.csproj.user
Assets
Signin.png
Controls
Properties
Views
IssueVision.Common
IssueVision.Common.csproj.user
Controls
Helpers
Models
Properties
Resources
Themes
IssueVision.Data
IssueVision.Data.csproj.user
Properties
Web
Resources
IssueVision.Data.Web
IssueVision.edmx
Helpers
MetadataClasses
Properties
Resources
Services
IssueVision.Model
IssueVision.Model.csproj.user
Properties
IssueVision.Setup
IssueVisionSetup.vdproj
IssueVision.ViewModel
IssueVision.ViewModel.csproj.user
Properties
IssueVision.Web
IssueVision.Web.csproj.user
Properties
IssueVision_Silverlight_20110316.zip
GalaSoft.MvvmLight.Extras.SL4.dll
GalaSoft.MvvmLight.SL4.dll
MenuControls.dll
System.Windows.Controls.DataVisualization.Toolkit.dll
System.Windows.Controls.Toolkit.dll
System.Windows.Controls.Toolkit.Internals.dll
System.Windows.Interactivity.dll
IssueVision.Client.csproj.user
Signin.png
DataSources
IssueVision.Data.Web.IssueVisionContext.datasource
IssueVision.Data.Web.PasswordResetContext.datasource
IssueVision.Common.csproj.user
IssueVision.Data.csproj.user
IssueVision.edmx
DataTypes
IssueVision.Model.csproj.user
IssueVisionSetup.vdproj
IssueVision.ViewModel.csproj.user
IssueVision.Web.csproj.user
IssueVision_Silverlight_20110606.zip
GalaSoft.MvvmLight.Extras.SL4.dll
GalaSoft.MvvmLight.SL4.dll
MenuControls.dll
System.Windows.Controls.DataVisualization.Toolkit.dll
System.Windows.Controls.Toolkit.dll
System.Windows.Controls.Toolkit.Internals.dll
System.Windows.Interactivity.dll
IssueVision.Client.csproj.user
Signin.png
IssueVision.Common.csproj.user
IssueVision.Data.csproj.user
IssueVision.edmx
IssueVision.Model.csproj.user
IssueVisionSetup.vdproj
IssueVision.ViewModel.csproj.user
IssueVision.Web.csproj.user
IssueVision_Silverlight_Setup.zip
IssueVisionSetup.msi
setup.exe
using System.Windows;
using System.Windows.Automation.Peers;
using System.Windows.Automation.Provider;
using System.Windows.Controls;
using System.Windows.Input;

namespace IssueVision.Common
{
    /// <summary>
    /// Helper class to provide the functionality of a default button
    /// </summary>
    public static class DefaultButtonHelper
    {
        #region "DefaultButton Attached Property"

        public static DependencyProperty DefaultButtonProperty =
            DependencyProperty.RegisterAttached("DefaultButton",
                                                typeof(Button),
                                                typeof(DefaultButtonHelper),
                                                new PropertyMetadata(null, DefaultButtonChanged));

        /// <summary>
        /// Get method for the attached property DefaultButton
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static Button GetDefaultButton(UIElement obj)
        {
            return (Button)obj.GetValue(DefaultButtonProperty);
        }


        /// <summary>
        /// Set method for the attached property DefaultButton
        /// </summary>
        /// <param name="obj"></param>
        /// <param name="button"></param>
        public static void SetDefaultButton(UIElement obj, Button button)
        {
            obj.SetValue(DefaultButtonProperty, button);
        }

        #endregion "DefaultButton Attached Property"

        #region "Private Data & Method"

        private static bool fireClickEvent = false;

        private static void DefaultButtonChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var uiElement = d as UIElement;
            var button = e.NewValue as Button;
            if (uiElement != null && button != null)
            {
                // when KeyDown event fires with Key.Enter, set focus to the default button
                // and set fireClickEvent to true
                uiElement.KeyDown += (sender, arg) =>
                {
                    if (arg.Key == Key.Enter && button.IsEnabled)
                    {
                        fireClickEvent = true;
                        button.Focus();
                    }
                };

                // when the GetFocus event fires for  the default button, invoke the click event
                // when fireClickEvent is true
                button.GotFocus += (s, argument) =>
                {
                    // if fireClickEvent is true, this event is trigger by
                    // the KeyDown event with Key.Enter from uiElement
                    if (fireClickEvent)
                    {
                        var peer = new ButtonAutomationPeer(button);
                        if (peer != null && peer.IsEnabled())
                        {
                            var invokeProv = peer.GetPattern(PatternInterface.Invoke) as IInvokeProvider;
                            if (invokeProv != null) invokeProv.Invoke();
                        }
                        // set fireClickEvent back to false
                        fireClickEvent = false;
                    }
                };
            }
        }

        #endregion "Private Data & Method"
    }
}

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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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About the Author

Weidong Shen
Software Developer (Senior)
United States United States
Weidong has been an information system professional since 1990. He has a Master's degree in Computer Science, and is currently a MCSD .NET

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Web04 | 2.8.141022.2 | Last Updated 7 Jul 2011
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