void GongSolutions.Wpf.DragDrop.IDropTarget.Drop(DropInfo dropInfo)
{
TaskViewModel sourceTask = (TaskViewModel)dropInfo.Data;
int oldIndex = ActiveTasks.IndexOf(sourceTask);
int newIndex = dropInfo.InsertIndex;
if (oldIndex >= 0)
{
if (newIndex < oldIndex)
{
// move the item up in the list toward the top
ActiveTasks.Move(oldIndex, newIndex);
List <TaskViewModel> tasksToSave = new List <TaskViewModel>();
// update our sort order values
for (int i = newIndex; i < oldIndex; i++)
{
TaskViewModel currentTaskVM = ActiveTasks[i];
TaskViewModel nextTaskVM = ActiveTasks[i + 1];
int currentSortOrder = currentTaskVM.SortOrder.Value;
int nextSortOrder = nextTaskVM.SortOrder.Value;
currentTaskVM.SortOrder = nextSortOrder;
nextTaskVM.SortOrder = currentSortOrder;
tasksToSave.Add(currentTaskVM);
if (i + 1 == oldIndex)
{
tasksToSave.Add(nextTaskVM);
}
}
foreach (TaskViewModel updatedTask in tasksToSave)
{
updatedTask.Save();
}
}
else if (newIndex > oldIndex)
{
// move the item down in the list toward the bottom
ActiveTasks.Move(oldIndex, newIndex - 1);
List <TaskViewModel> tasksToSave = new List <TaskViewModel>();
// update our sort order values
for (int i = newIndex - 1; i > oldIndex; i--)
{
TaskViewModel currentTaskVM = ActiveTasks[i];
TaskViewModel previousTaskVM = ActiveTasks[i - 1];
int currentSortOrder = currentTaskVM.SortOrder.Value;
int previousSortOrder = previousTaskVM.SortOrder.Value;
currentTaskVM.SortOrder = previousSortOrder;
previousTaskVM.SortOrder = currentSortOrder;
tasksToSave.Add(currentTaskVM);
if (i - 1 == oldIndex)
{
tasksToSave.Add(previousTaskVM);
}
}
foreach (TaskViewModel updatedTask in tasksToSave)
{
updatedTask.Save();
}
}
}
}
