/// <summary>
/// Handler changes drag cursor and starts timer to expand route's details
/// when user drags any order over row.
/// </summary>
/// <param name="sender">Row.</param>
/// <param name="e">Drag event args.</param>
private void _DragOverRow(object sender, DragEventArgs e)
{
var draggedOverRow = sender as Row;
Object dragOveredObject = draggedOverRow.DataContext;
var dragAndDropHelper = new DragAndDropHelper();
// Check if Drag&Drop operation allowed.
ICollection<Order> orders = dragAndDropHelper.GetDraggingOrders(e.Data);
bool isDropAllowed = dragAndDropHelper.DoesDropAllowed(dragOveredObject, orders);
if (!isDropAllowed)
{
e.Effects = DragDropEffects.None;
e.Handled = true;
}
else
e.Effects = DragDropEffects.Move;
// If dragged over route has stops and timer disabled (not turned on yet or already
// turned off) - start timer and remember context.
var route = dragOveredObject as Route;
if ((null != route) &&
route.Stops != null &&
route.Stops.Count > 0 &&
_expandTimer.Enabled == false)
{
_expandTimer.Enabled = true;
_expandTimer.Start();
_currentRowToExpand = ((Row)sender).DataContext;
}
}
/// <summary>
/// Method checks is dragging allowed and starts dragging if possible.
/// </summary>
private void _TryToStartDragging()
{
Collection<object> selection = _GetSelectedStops();
DragAndDropHelper dragAndDropHelper = new DragAndDropHelper();
bool isDragAllowed = dragAndDropHelper.IsDragAllowed(selection);
if (isDragAllowed && selection.Count > 0)
{
// we use deferred call to allow grid complete BringItemIntoView
this.Dispatcher.BeginInvoke(new Action(delegate()
{
dragAndDropHelper.StartDragOrders(selection, DragSource.RoutesView);
}));
}
}
/// <summary>
/// Drops objects to grid.
/// </summary>
/// <param name="sender">Data grid control sender.</param>
/// <param name="e">Event args.</param>
private void _DataGridControlDrop(object sender, DragEventArgs e)
{
// Get row where object was dropped.
Row parentRow = XceedVisualTreeHelper.GetRowByEventArgs(e);
if (parentRow == null)
return;
// Get data from dropped object.
object targetData = _GetTargetData(parentRow);
// Do necessary actions (move or reassign routes etc.).
DragAndDropHelper dragAndDropHelper = new DragAndDropHelper();
dragAndDropHelper.Drop(targetData, e.Data);
}
/// <summary>
/// Fired when an object is dropped on the calendar.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void calendar_Drop(object sender, DragEventArgs e)
{
DragAndDropHelper dragAndDropHelper = new DragAndDropHelper();
FrameworkElement targetFrameworkElement = (FrameworkElement)e.OriginalSource;
Object context = targetFrameworkElement.DataContext;
while (!(context is DateTime))
{
targetFrameworkElement = (FrameworkElement)VisualTreeHelper.GetParent(targetFrameworkElement);
context = targetFrameworkElement.DataContext;
Debug.Assert(context != null); // context shouldn't be null
}
DateTime targetDate = (DateTime)context;
if (targetDate != null)
dragAndDropHelper.DropOnDate(targetDate, e.Data);
}