void IDropTarget.Drop(UIElement draggedElement)
{
ColumnManagerCell cell = draggedElement as ColumnManagerCell;
if (cell == null)
{
return;
}
HierarchicalGroupByControlNode hierarchicalGroupByControlNode = this.GetHierarchicalGroupByControlNodeFromColumnManagerCell(cell);
// It may not be visible
if (hierarchicalGroupByControlNode != null)
{
hierarchicalGroupByControlNode.HideFarDropMark(cell);
}
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this);
DataGridControl parentGrid = (dataGridContext != null)
? dataGridContext.DataGridControl
: null;
GroupingHelper.AppendNewGroupFromColumnManagerCell(cell, parentGrid);
// Notify groups have changed for NoGroupContent
this.UpdateHasGroups();
}
void IDropTarget.DragLeave(UIElement draggedElement)
{
ColumnManagerCell cell = draggedElement as ColumnManagerCell;
if (cell != null)
{
HierarchicalGroupByControlNode hierarchicalGroupByControlNode = this.GetHierarchicalGroupByControlNodeFromColumnManagerCell(cell);
// It may not be visible
if (hierarchicalGroupByControlNode != null)
{
hierarchicalGroupByControlNode.HideFarDropMark();
}
}
else
{
HierarchicalGroupByItem hierarchicalGroupByItem = draggedElement as HierarchicalGroupByItem;
if (hierarchicalGroupByItem == null)
{
return;
}
HierarchicalGroupByControlNode hierarchicalGroupByControlNode = this.GetHierarchicalGroupByControlNodeFromHierarchicalGroupByItem(hierarchicalGroupByItem);
Debug.Assert(hierarchicalGroupByControlNode != null, "CanDrop should have returned false");
if (hierarchicalGroupByControlNode == null)
{
throw new DataGridInternalException("A HierarchicalGroupByControlNode must exist for every level.");
}
hierarchicalGroupByControlNode.HideFarDropMark();
}
}
void IDropTarget.Drop(UIElement draggedElement)
{
ColumnManagerCell cell = draggedElement as ColumnManagerCell;
if (cell == null)
{
return;
}
HierarchicalGroupByControl parentGBC = GroupingHelper.GetHierarchicalGroupByControl(this);
if (parentGBC == null)
{
throw new DataGridInternalException("The hierarchical group-by control node must be rooted by a HierarchicalGroupByControl.");
}
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this);
DataGridControl parentGrid = (dataGridContext != null)
? dataGridContext.DataGridControl
: null;
GroupingHelper.AppendNewGroupFromColumnManagerCell(cell, parentGrid);
// Notify groups have changed for NoGroupContent
parentGBC.UpdateHasGroups();
HierarchicalGroupByControlNode hierarchicalGroupByControlNode = parentGBC.GetHierarchicalGroupByControlNodeFromColumnManagerCell(cell);
if (hierarchicalGroupByControlNode == null)
{
return;
}
hierarchicalGroupByControlNode.HideFarDropMark(cell);
this.HideFarDropMark();
}
void IDropTarget.DragLeave(UIElement draggedElement)
{
ColumnManagerCell cell = draggedElement as ColumnManagerCell;
if (cell != null)
{
DataGridContext draggedCellDataGridContext = DataGridControl.GetDataGridContext(cell);
HierarchicalGroupByControlNode draggedOverHierarchicalGroupByControlNode = HierarchicalGroupByItem.GetParentHierarchicalGroupByControlNode(this);
if (draggedOverHierarchicalGroupByControlNode == null)
{
throw new DataGridInternalException("We should never be dragged over and not contained inside a HierarchicalGroupByControlNode.");
}
if (draggedOverHierarchicalGroupByControlNode.GroupLevelDescriptions == draggedCellDataGridContext.GroupLevelDescriptions)
{
this.HideDropMark();
}
else
{
// This ColumnManagerCell does not belong this parent HierarchicalGroupByControlNode, display the DropMark on the correct one
HierarchicalGroupByControl parentGBC = GroupingHelper.GetHierarchicalGroupByControl(draggedOverHierarchicalGroupByControlNode);
if (parentGBC == null)
{
throw new DataGridInternalException("A hierarchical group-by item must be rooted by a HierarchicalGroupByControl.");
}
HierarchicalGroupByControlNode hierarchicalGroupByControlNode = parentGBC.GetHierarchicalGroupByControlNodeFromColumnManagerCell(cell);
Debug.Assert(hierarchicalGroupByControlNode != null, "CanDrop should have returned false");
if (hierarchicalGroupByControlNode == null)
{
throw new DataGridInternalException("A HierarchicalGroupByControlNode must exist for every level.");
}
hierarchicalGroupByControlNode.HideFarDropMark(cell);
}
}
else
{
HierarchicalGroupByItem hierarchicalGroupByItem = draggedElement as HierarchicalGroupByItem;
if (hierarchicalGroupByItem == null)
{
return;
}
HierarchicalGroupByControlNode draggedHierarchicalGroupByControlNode = HierarchicalGroupByItem.GetParentHierarchicalGroupByControlNode(hierarchicalGroupByItem);
HierarchicalGroupByControlNode draggedOverHierarchicalGroupByControlNode = HierarchicalGroupByItem.GetParentHierarchicalGroupByControlNode(this);
if (draggedHierarchicalGroupByControlNode == null)
{
throw new DataGridInternalException("draggedHierarchicalGroupByControlNode is null.");
}
if (draggedOverHierarchicalGroupByControlNode == null)
{
throw new DataGridInternalException("draggedOverHierarchicalGroupByControlNode is null.");
}
if (draggedHierarchicalGroupByControlNode.GroupLevelDescriptions == draggedOverHierarchicalGroupByControlNode.GroupLevelDescriptions)
{
this.HideDropMark();
}
else
{
// This HierarchicalGroupByItem does not belong this parent HierarchicalGroupByControlNode, display the DropMark on the correct one
HierarchicalGroupByControl parentGBC = GroupingHelper.GetHierarchicalGroupByControl(draggedOverHierarchicalGroupByControlNode);
Debug.Assert(parentGBC != null);
if (parentGBC == null)
{
throw new DataGridInternalException("A hierarchical group-by item must be rooted by a HierarchicalGroupByControl.");
}
HierarchicalGroupByControlNode hierarchicalGroupByControlNode = parentGBC.GetHierarchicalGroupByControlNodeFromHierarchicalGroupByItem(hierarchicalGroupByItem);
Debug.Assert(hierarchicalGroupByControlNode != null, "CanDrop should have returned false");
if (hierarchicalGroupByControlNode == null)
{
throw new DataGridInternalException("A HierarchicalGroupByControlNode must exist for every level.");
}
hierarchicalGroupByControlNode.HideFarDropMark();
}
}
}