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 Microsoft.Surface.Presentation.Controls;
using Microsoft.Surface.Presentation;

using FingersDance.Views;
using FingersDance.ViewModels;

namespace FingersDance.Views
{
    /// <summary>
    /// Interaction logic for TimelineView.xaml
    /// </summary>
    public partial class TimelineView : UserControl
    {
        public TimelineView()
        {
            InitializeComponent();
        }

        private void listview_PreviewContactDown(object sender, Microsoft.Surface.Presentation.ContactEventArgs e)
        {
            FrameworkElement findSource = e.OriginalSource as FrameworkElement;
            SurfaceListBoxItem draggedElement = null;

            // Find the touched SurfaceListBoxItem object.
            while (draggedElement == null && findSource != null)
            {
                if ((draggedElement = findSource as SurfaceListBoxItem) == null)
                {
                    findSource = VisualTreeHelper.GetParent(findSource) as FrameworkElement;
                }
            }

            if (draggedElement == null)
            {
                return;
            }

            // Create the cursor visual.
            ContentControl cursorVisual = new ContentControl()
            {
                Content = new TimelineAnnotationView()
                {
                    DataContext = findSource.DataContext
                }
            };

            // TO DO : apply the good scale to the TAV because the dragged one has scale at 1.


            // Add a handler. This will enable the application to change the visual cues.
            //SurfaceDragDrop.AddTargetChangedHandler(cursorVisual, OnTargetChanged);

            // Create a list of input devices. Add the contacts that
            // are currently captured within the dragged element and
            // the current contact (if it isn't already in the list).
            List<InputDevice> devices = new List<InputDevice>();
            devices.Add(e.Contact);
            foreach (Contact contact in draggedElement.ContactsCapturedWithin)
            {
                if (contact != e.Contact)
                {
                    devices.Add(contact);
                }
            }

            // Get the drag source object
            ItemsControl dragSource = ItemsControl.ItemsControlFromItemContainer(draggedElement);

            bool startDragOkay =
                SurfaceDragDrop.BeginDragDrop(
                  dragSource,                 // The SurfaceListBox object that the cursor is dragged out from.
                  draggedElement,             // The SurfaceListBoxItem object that is dragged from the drag source.
                  cursorVisual,               // The visual element of the cursor.
                  draggedElement.DataContext, // The data associated with the cursor.
                  devices,                    // The input devices that start dragging the cursor.
                  DragDropEffects.Move);      // The allowed drag-and-drop effects of the operation.

            // If the drag began successfully, set e.Handled to true. 
            // Otherwise SurfaceListBoxItem captures the contact 
            // and causes the drag operation to fail.
            e.Handled = startDragOkay;

        }

        
    }
}
