Visual Application Launcher

namespace VAL
{
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Windows.Forms;
    using System.ServiceModel;
    using VAL.Contracts;
    using VAL.Model;
    using VAL.Controls;
    using VAL.Properties;
    using VAL.Contracts.ServiceFaults;

    /// <summary>
    /// A form to allow the administrator to edit group types
    /// </summary>
    public partial class GroupTypeMaintenance : PersistedForm
    {
        private GroupType groupType;
        private ListViewItem selectedItem;

        #region Construct and Load

        /// <summary>
        /// Ctor
        /// </summary>
        public GroupTypeMaintenance(IAdministratorService service)
        {
            InitializeComponent();

            this.Service = service;
            LoadGroupTypes();
            SetFormEditMode(false);
        }

        private IAdministratorService Service { get; set; }

        #endregion

        private void LoadGroupTypes()
        {
            try
            {
                groupTypesList.BeginUpdate();

                this.groupTypesList.Items.Clear();

                var groupTypes = Service.GetGroupTypes();
                foreach (var groupType in groupTypes)
                {
                    if (groupType.Id > 0)
                        groupTypesList.Items.Add(CreateListViewItem(groupType));
                }
            }
            finally
            {
                groupTypesList.EndUpdate();
            }
        }

        private ListViewItem CreateListViewItem(GroupType item)
        {
            return new ListViewItem()
            {
                Text = item.Description,
                Tag = item
            };
        }

        private void SetFormEditMode(bool editing)
        {
            groupTypesList.Enabled = (!editing);
            this.detailsBox.Enabled = editing;
            this.applyButton.Enabled = editing;
            if (!editing)
            {
                this.groupType = null;
                this.selectedItem = null;
                this.descriptionText.Text = String.Empty;
            }
        }

        private void cancelButton_Click(object sender, EventArgs e)
        {
            if (!groupTypesList.Enabled)
            {
                SetFormEditMode(false);
            }
            else
            {
                this.Close();
            }
        }

        private void EditGroupType()
        {
            if (!this.TryGetListViewItem(this.groupTypesList, out selectedItem))
                return;

            this.groupType = (GroupType)selectedItem.Tag;

            // Binds the user GUI fields to those of our object
            BindObjectFields();

            SetFormEditMode(true);
        }

        private void BindObjectFields()
        {
            BindingHelper.BindField(this.descriptionText, "Text", groupType, "Description");
        }

        private void groupTypesList_DoubleClick(object sender, EventArgs e)
        {
            EditGroupType();
        }

        private void applyButton_Click(object sender, EventArgs e)
        {
            if (!groupType.IsValid)
            {
                Messaging.ShowError(groupType.ErrorMessage);
                return;
            }

            try
            {
                groupType = Service.SaveGroupType(groupType);
            }
            catch (System.ServiceModel.FaultException<VAL.Contracts.ServiceFaults.BusinessRulesFault> ex)
            {
                Messaging.ShowError(ex.Message);
                return;
            }  
                        
            if (this.selectedItem == null)
            {
                ListViewItem lvi = CreateListViewItem(groupType); 
                this.groupTypesList.Items.Add(lvi);
            }
            else
            {
                this.selectedItem.Text = groupType.Description;
            }
                
            SetFormEditMode(false);
        }

        private void addToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.groupType = new GroupType();
            BindObjectFields();
            SetFormEditMode(true);
        }

        private void editToolStripMenuItem_Click(object sender, EventArgs e)
        {
            EditGroupType();
        }

        private void deleteToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (!this.TryGetListViewItem(this.groupTypesList, out selectedItem))
                return;

            GroupType gt = (GroupType)selectedItem.Tag;

            try
            {
                Service.DeleteGroupType(gt.Id);
            }
            catch (FaultException<BusinessRulesFault> ex)
            {
                Messaging.ShowError(ex.Message);
                return;
            }

            this.groupTypesList.Items.Remove(selectedItem);
            selectedItem = null;
        }

    }
}