bool IDropTarget.CanDropElement(UIElement draggedElement)
{
ColumnManagerCell draggedCell = draggedElement as ColumnManagerCell;
if ((draggedCell == null) || (this == draggedCell))
{
return(false);
}
ColumnManagerRow parentRow = this.ParentRow as ColumnManagerRow;
if ((parentRow == null) || !parentRow.AllowColumnReorder)
{
return(false);
}
if (!ColumnManagerCell.CanMove(draggedCell) || !ColumnManagerCell.CanMove(this))
{
return(false);
}
DataGridContext draggedDetailContext = draggedCell.DataGridContext;
DataGridContext sourceDetailContext = this.DataGridContext;
Debug.Assert((draggedDetailContext != null) && (sourceDetailContext != null));
return((sourceDetailContext.SourceDetailConfiguration == draggedDetailContext.SourceDetailConfiguration) &&
(sourceDetailContext.GroupLevelDescriptions == draggedDetailContext.GroupLevelDescriptions));
}
bool IDropTarget.CanDropElement(UIElement draggedElement, RelativePoint mousePosition)
{
var draggedCell = draggedElement as ColumnManagerCell;
if ((draggedCell == null) || (this == draggedCell))
{
return(false);
}
var parentRow = this.ParentRow as ColumnManagerRow;
if ((parentRow == null) || !parentRow.AllowColumnReorder)
{
return(false);
}
var draggedDetailContext = draggedCell.DataGridContext;
var sourceDetailContext = this.DataGridContext;
Debug.Assert((draggedDetailContext != null) && (sourceDetailContext != null));
if ((sourceDetailContext.SourceDetailConfiguration != draggedDetailContext.SourceDetailConfiguration) ||
(sourceDetailContext.GroupLevelDescriptions != draggedDetailContext.GroupLevelDescriptions))
{
return(false);
}
if (!ColumnManagerCell.CanMove(draggedCell))
{
return(false);
}
var manager = draggedCell.DragSourceManager as ColumnReorderingDragSourceManager;
if ((manager != null) && (manager.IsAnimatedColumnReorderingEnabled))
{
if (!manager.CanReorder(draggedCell, this, mousePosition))
{
return(false);
}
}
else
{
var relativePosition = mousePosition.GetPoint(this);
var moveBefore = (relativePosition.X <= this.ActualWidth / 2d);
if (moveBefore)
{
if (!draggedCell.CanMoveBefore(this.ParentColumn))
{
return(false);
}
}
else
{
if (!draggedCell.CanMoveAfter(this.ParentColumn))
{
return(false);
}
}
}
return(true);
}