// Determines the index that the dragged item would occupy when dropped
private int GetDragIndex()
{
double dragLocation = _dragImage.GetRelativePosition(_todoList).Y +
_scrollViewer.VerticalOffset +
_dragImage.ActualHeight / 2;
int dragIndex = (int)(dragLocation / _dragImage.ActualHeight);
dragIndex = Math.Min(_todoItems.Count - 1, dragIndex);
return(dragIndex);
}
// Determines the index that the dragged item would occupy when dropped
private int GetDragIndex()
{
System.Windows.Point relativePosition = _dragImage.GetRelativePosition(this.interactionListControl);
Debug.WriteLine("DragReOrderInteraction. RelativePosition {0}, scrollViewer Vertical offset {1}, dragImage height {2}",
relativePosition.Y,
_scrollViewer.VerticalOffset,
_dragImage.ActualHeight);
double dragLocation = relativePosition.Y +
_scrollViewer.VerticalOffset +
_dragImage.ActualHeight / 2;
Debug.WriteLine("Drag location {0}", dragLocation);
int dragIndex = 0;
double offset = 0;
if (this.interactionList != null)
{
for (int i = 0; i < this.interactionList.Count; i++)
{
var container = this.interactionListControl.ItemContainerGenerator.ContainerFromItem(this.interactionList[i]);
var taskPanel = FindNamedDescendant <StackPanel>(container, "TaskStackPanel");
offset += taskPanel.ActualHeight;
Debug.WriteLine("item {0}, height {1}, offset so far {2}", i, taskPanel.ActualHeight, offset);
dragIndex++;
if (offset > dragLocation)
{
break;
}
}
}
//int dragIndex = (int)(dragLocation / _dragImage.ActualHeight);
Debug.WriteLine("Drag index {0}", dragIndex);
dragIndex = Math.Min(this.interactionList.Count - 1, dragIndex);
if (dragIndex <= 0)
{
dragIndex = 1;
}
if (this.interactionList[dragIndex].IsPullDown)
{
dragIndex++;
}
return(dragIndex);
}