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Modeling M-V-VM

, 5 Jun 2009 CPOL
An article which tries to present an approach for decoupling M-V-VM View Model objects
TestTreeViewWithLeftBarView
bin
Debug
TestTreeViewWithLeftBarView.exe
TestTreeViewWithLeftBarView.vshost.exe
TestTreeViewWithLeftBarView.vshost.exe.manifest
WorldDataLib.dll
Properties
Resources
Service References
WorldServiceReference
configuration.svcinfo
configuration91.svcinfo
Reference.svcmap
service.wsdl
View
ViewModel
WorldDataLib
bin
Debug
WorldDataLib.dll
Model
Properties
WorldServiceApp
bin
Debug
WorldDataLib.dll
WorldServiceApp.exe
WorldServiceApp.vshost.exe
WorldServiceApp.vshost.exe.manifest
WorldServiceLib.dll
Properties
WorldServiceLib
bin
Debug
WorldDataLib.dll
WorldServiceLib.dll
Properties
WorldServiceLib.csproj.user
Modeled_ViewModel.suo
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections.ObjectModel;
using System.Windows.Input;
using System.ComponentModel;

using WorldDataLib.Model;

namespace TestTreeViewWithRightBarView.ViewModel
{
    public class ContinentViewModel : ITreeViewWithChildrenNode, IContinentViewModel, ISelectionSectionPresenter, INotifyPropertyChanged
    {
        #region Members

        IViewModel m_Parent;
        Continent m_Continent;

        ObservableCollection<ITreeViewNode> m_Children;

        #endregion

        #region Properties
        
        #region ITreeViewWithChildrenNode Members

        public ObservableCollection<ITreeViewNode> Children
        {
            get 
            {
                return m_Children; 
            }
        }

        #endregion

        #region ITreeViewNode Members

        public string Caption
        {
            get 
            {
                string str = string.Empty;
                if (m_Continent != null)
                {
                    str = m_Continent.Name;
                }
                return str;
            }
        }

        #endregion

        #region IViewModel Members

        public IViewModel VMParent
        {
            get 
            { 
                return m_Parent; 
            }
        }

        #endregion

        #region ISelectionSectionPresenter Members

        public string Title
        {
            get;
            set;
        }

        #endregion

        public double Size
        {
            get;
            set;
        }

        #endregion

        #region Methods

        #region Ctor

        public ContinentViewModel(IViewModel parent, Continent continent)
        {
            m_Parent = parent;
            m_Continent = continent;
            m_Children = new ObservableCollection<ITreeViewNode>();
            if ((m_Continent != null) && (m_Continent.Countries != null))
            {
                for (int iter = 0; iter < m_Continent.Countries.Count; iter++)
                {
                    m_Children.Add(new CountryViewModel(this, m_Continent.Countries[iter]));
                }
            }
        }

        #endregion

        #region IViewModel Members

        public void HandleEvent(IViewModel sender, object param, ViewModelOperationsEnum viewModelEvent)
        {
            if (m_Parent != null)
            {
                m_Parent.HandleEvent(sender, param, viewModelEvent);
            }
        }

        #endregion

        #region GotFocus

        public ICommand GotFocus
        {
            get
            {
                return new DelegateCommand(this.ControlGotFocus);
            }
        }

        /// <summary>
        /// When the control gets focus, an event is fired for external handling
        /// </summary>
        public void ControlGotFocus()
        {
            if (VMParent != null)
            {
                VMParent.HandleEvent(this, null, ViewModelOperationsEnum.GotFocus);
                VMParent.HandleEvent(this, Caption, ViewModelOperationsEnum.GetContinentSize);
            }
        }

        #endregion

        #region IContinentViewModel Members

        public void SetSize(double fSize)
        {
            Size = fSize;
            Title = string.Format("Continent {0} size is {1}sq miles",Caption, Size);
            OnPropertyChanged("Title");
        }

        #endregion

        #region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;

        private void OnPropertyChanged(string str)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(str));
            }
        }

        #endregion

        #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

Izhar Lotem
Software Developer
Israel Israel
Software Developer in a promising Clean-Tech company

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Article Copyright 2009 by Izhar Lotem
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