|
public static GetItemContainerFromPoint ( |
||
| itemsControl | ||
| p | Point | |
| return | UIElement | |
private void DragStarted(ItemsControl itemsControl)
{
Type dataType = _data.GetType();
if (!(dataType.IsSubclassOf(ItemType) || dataType == ItemType || ItemType.IsAssignableFrom(dataType)))
{
return;
}
UIElement draggedItemContainer = Helper.GetItemContainerFromPoint(itemsControl, _dragStartPosition);
_isDragging = true;
DataObject dObject = new DataObject(ItemType, _data);
DragDropEffects e = System.Windows.DragDrop.DoDragDrop(itemsControl, dObject, DragDropEffects.Copy | DragDropEffects.Move);
if ((e & DragDropEffects.Move) != 0)
{
if (draggedItemContainer != null)
{
int dragItemIndex = itemsControl.ItemContainerGenerator.IndexFromContainer(draggedItemContainer);
Helper.RemoveItem(itemsControl, dragItemIndex);
}
else
{
Helper.RemoveItem(itemsControl, _data);
}
}
ResetState();
}
private void InitializeInsertAdorner(ItemsControl itemsControl, DragEventArgs e)
{
if (_insertAdorner == null)
{
var adornerLayer = AdornerLayer.GetAdornerLayer(itemsControl);
UIElement itemContainer = Helper.GetItemContainerFromPoint(itemsControl, e.GetPosition(itemsControl));
if (itemContainer != null)
{
bool isPointInTopHalf = Helper.IsPointInTopHalf(itemsControl, e);
bool isItemsControlOrientationHorizontal = Helper.IsItemControlOrientationHorizontal(itemsControl);
_insertAdorner = new InsertAdorner(isPointInTopHalf, isItemsControlOrientationHorizontal, itemContainer, adornerLayer);
}
}
}
private int FindInsertionIndex(ItemsControl itemsControl, DragEventArgs e)
{
UIElement dropTargetContainer = Helper.GetItemContainerFromPoint(itemsControl, e.GetPosition(itemsControl));
if (dropTargetContainer != null)
{
int index = itemsControl.ItemContainerGenerator.IndexFromContainer(dropTargetContainer);
if (Helper.IsPointInTopHalf(itemsControl, e))
{
return(index);
}
else
{
return(index + 1);
}
}
return(itemsControl.Items.Count);
}