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Creating View-Switching Applications with Prism 4

, 6 Mar 2011 CPOL
How to get a Prism 4 line-of-business application up and running, using WPF and the Unity Dependency Injection (DI) container.
Prism4Demo.zip
Prism4Demo
Prism4Demo.Common
BaseClasses
bin
Events
obj
Debug
TempPE
Prism4Demo.Common.csproj.user
Properties
Prism4Demo.Library
FsTools
FsTaskButton.dll
Prism
Microsoft.Practices.Prism.dll
Microsoft.Practices.Prism.UnityExtensions.dll
Microsoft.Practices.ServiceLocation.dll
Microsoft.Practices.Unity.dll
Ribbon
RibbonControlsLibrary.dll
Prism4Demo.ModuleA
bin
Commands
obj
Debug
TempPE
Views
Prism4Demo.ModuleA.csproj.user
Properties
Settings.settings
Services
ViewModels
Views
Images
LargeIcon.png
module_a.png
SmallIcon.png
Prism4Demo.ModuleB
bin
Commands
obj
Debug
TempPE
Views
Prism4Demo.ModuleB.csproj.user
Properties
Settings.settings
Services
ViewModels
Views
Images
LargeIcon.png
module_b.png
SmallIcon.png
Prism4Demo
bin
obj
x86
Debug
TempPE
Views
Prism4Demo.csproj.user
Properties
Settings.settings
Services
Utility
ViewModels
Views
Images
LargeIcon.png
new.png
open.png
print.png
ribbon.png
save.png
SmallIcon.png
using System.Windows.Input;
using Microsoft.Practices.Prism.Events;
using Microsoft.Practices.Prism.Regions;
using Microsoft.Practices.ServiceLocation;
using Prism4Demo.Common.BaseClasses;
using Prism4Demo.Common.Events;
using Prism4Demo.ModuleB.Commands;

namespace Prism4Demo.ModuleB
{
    public class ModuleBTaskButtonViewModel : ViewModelBase, INavigationAware
    {
        #region Fields

        // Property variables
        private bool? p_IsChecked;

        #endregion

        #region Constructor

        /// <summary>
        /// Default constructor.
        /// </summary>
        public ModuleBTaskButtonViewModel()
        {
            this.Initialize();
        }

        #endregion

        #region INavigationAware Members

        public bool IsNavigationTarget(NavigationContext navigationContext)
        {
            throw new System.NotImplementedException();
        }

        public void OnNavigatedFrom(NavigationContext navigationContext)
        {
            throw new System.NotImplementedException();
        }

        public void OnNavigatedTo(NavigationContext navigationContext)
        {
            throw new System.NotImplementedException();
        }

        #endregion

        #region Command Properties

        /// <summary>
        /// Loads the view for Module B.
        /// </summary>
        public ICommand ShowModuleBView { get; set; }   

        #endregion

        #region Administrative Properties

        /// <summary>
        /// Whether the button is checked (selected).
        /// </summary>
        public bool? IsChecked
        {
            get { return p_IsChecked; }

            set
            {
                base.RaisePropertyChangingEvent("IsChecked");
                p_IsChecked = value;
                base.RaisePropertyChangedEvent("IsChecked");
            }
        }

        #endregion

        #region Event Handlers

        private void OnNavigationCompleted(string publisher)
        {
            // Exit if this module published the event
            if (publisher == "ModuleB") return;

            // Otherwise, uncheck this button
            this.IsChecked = false;
        }

        #endregion

        #region Private Methods

        /// <summary>
        /// Initializes the view model.
        /// </summary>
        private void Initialize()
        {
            // Initialize command properties
            this.ShowModuleBView = new ShowModuleBViewCommand(this);

            // Initialize administrative properties
            this.IsChecked = false;

            // Subscribe to Composite Presentation Events
            var eventAggregator = ServiceLocator.Current.GetInstance<IEventAggregator>();
            var navigationCompletedEvent = eventAggregator.GetEvent<NavigationCompletedEvent>();
            navigationCompletedEvent.Subscribe(OnNavigationCompleted, ThreadOption.UIThread);
        }

        #endregion
    }
}

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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

David Veeneman
Software Developer (Senior) Foresight Systems
United States United States
David Veeneman is a financial planner and software developer. He is the author of "The Fortune in Your Future" (McGraw-Hill 1998). His company, Foresight Systems, develops planning and financial software.

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