C.B.R.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using CBR.Core.Models;
using CBR.ViewModels;
using CBR.Core.Helpers;

namespace CBR.Views
{
    /// <summary>
    /// Interaction logic for ExplorerView.xaml
    /// </summary>
    public partial class ExplorerView : UserControl
    {
        #region --------------------CONSTRUCTOR--------------------

        private DragHelper _drager = null;

        public ExplorerView()
        {
            InitializeComponent();

            if (!System.ComponentModel.DesignerProperties.GetIsInDesignMode(this))
            {
                DataContext = new ExplorerViewModel();

                Messenger.Default.Register<MessageBase>(this, (s) => { Grouping(); });

                _drager = new DragHelper(CatalogListBox);
                _drager.OnStartDrag += new StartDragEventHandler(drag_OnStartDrag);
                _drager.OnContinueDrag += new StartDragEventHandler(_drager_OnContinueDrag);
            }
        }
        
        #endregion

        #region --------------------START DRAG--------------------

        void drag_OnStartDrag(object sender, MouseEventArgs e)
        {
            try
            {
                // Get the dragged ListViewItem
                ListBoxItem item = VisualHelper.FindAnchestor<ListBoxItem>((DependencyObject)e.OriginalSource);

                if (item != null)
                {
                    Book bk = (Book)CatalogListBox.ItemContainerGenerator.ItemFromContainer(item);
                    _drager.DragDropContinue(bk != null);
                }
            }
            catch (Exception err)
            {
                ExceptionHelper.Manage("ExplorerView:drag_OnStartDrag", err);
            }
        }

        void _drager_OnContinueDrag(object sender, MouseEventArgs e)
        {
            try
            {
                // Get the dragged ListViewItem
                ListBoxItem item = VisualHelper.FindAnchestor<ListBoxItem>((DependencyObject)e.OriginalSource);

                if (item != null)
                {
                    Book bk = (Book)CatalogListBox.ItemContainerGenerator.ItemFromContainer(item);

                    // Find the data behind the item + Initialize the drag & drop operation
                    DataObject dragData = new DataObject("CBR.Book.Path", bk.FilePath);
                    _drager.DoDragDrop(dragData, item);
                }
            }
            catch (Exception err)
            {
                ExceptionHelper.Manage("ExplorerView:drag_OnStartDrag", err);
            }
        }

        #endregion

        #region --------------------INTERNAL--------------------

        /// <summary>
        /// handle a item double click (using Interaction.Triggers is not working because on list
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void Item_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            try
            {
                ExplorerViewModel model = DataContext as ExplorerViewModel;
                if (model == null)
                    return;

                model.ForwardCommand.Execute( "BookReadCommand" );
            }
            catch (Exception err)
            {
                ExceptionHelper.Manage("ExplorerView:Grouping", err);
            }
        } 

        /// <summary>
        /// called by the message register delegate
        /// </summary>
        public void Grouping()
        {
            try
            {
                ExplorerViewModel model = DataContext as ExplorerViewModel;
                if (model == null)
                    return;

                if (model.Books.GroupDescriptions.Count > 0)
                    CatalogListBox.GroupStyle.Add(new GroupStyle() { ContainerStyle = (Style)FindResource("AlphaGroupContainerStyle") });
                else
                {
                    CatalogListBox.GroupStyle.Clear();
                }
            }
            catch (Exception err)
            {
                ExceptionHelper.Manage("ExplorerView:Grouping", err);
            }
        }

        #endregion 
    }
}