void IDropTarget.Drop(UIElement draggedElement, RelativePoint mousePosition)
{
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();
}
bool IDropTarget.CanDropElement(UIElement draggedElement, RelativePoint mousePosition)
{
var draggedCell = draggedElement as ColumnManagerCell;
if (draggedCell == null)
{
return(false);
}
var manager = draggedCell.DragSourceManager as ColumnReorderingDragSourceManager;
if ((manager != null) && manager.IsAnimatedColumnReorderingEnabled && draggedCell.IsBeingDragged)
{
var dataGridContext = DataGridControl.GetDataGridContext(this);
if ((dataGridContext == null) || !dataGridContext.Columns.Contains(draggedCell.ParentColumn))
{
return(false);
}
// We are not interested by the y-axis.
var relativePoint = mousePosition.GetPoint(this);
var xPosition = new RelativePoint(this, new Point(relativePoint.X, this.ActualHeight / 2d));
var targetCell = (from dropTarget in manager.GetDropTargetsAtPoint(xPosition)
let dropCell = dropTarget as ColumnManagerCell
where (dropCell != null)
select dropCell).FirstOrDefault();
if ((targetCell == null) || (targetCell == draggedCell) || (( IDropTarget )targetCell).CanDropElement(draggedElement, xPosition))
{
return(true);
}
}
return(false);
}
void IDropTarget.DragOver(UIElement draggedElement, RelativePoint mousePosition)
{
var cell = draggedElement as ColumnManagerCell;
if (cell == null)
{
return;
}
var draggedElementContext = DataGridControl.GetDataGridContext(draggedElement);
var lastIndex = draggedElementContext.GroupLevelDescriptions.Count - 1;
if (lastIndex < 0)
{
return;
}
var groupByItem = this.ItemContainerGenerator.ContainerFromIndex(lastIndex) as GroupByItem;
if (groupByItem == null)
{
throw new DataGridInternalException("groupByItem is null.");
}
groupByItem.ShowDropMark(mousePosition);
}
void IDropTarget.DragOver(UIElement draggedElement, RelativePoint mousePosition)
{
ColumnManagerCell cell = draggedElement as ColumnManagerCell;
if (cell != null)
{
HierarchicalGroupByControlNode hierarchicalGroupByControlNode = this.GetHierarchicalGroupByControlNodeFromColumnManagerCell(cell);
// It may not be visible
if (hierarchicalGroupByControlNode != null)
{
hierarchicalGroupByControlNode.ShowFarDropMark(cell, mousePosition);
}
}
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.ShowFarDropMark(mousePosition);
}
}
void IDropTarget.Drop(UIElement draggedElement, RelativePoint mousePosition)
{
var cell = draggedElement as ColumnManagerCell;
if (cell == null)
{
return;
}
var draggedElementContext = DataGridControl.GetDataGridContext(draggedElement);
var lastIndex = draggedElementContext.GroupLevelDescriptions.Count - 1;
if (lastIndex >= 0)
{
var groupByItem = this.ItemContainerGenerator.ContainerFromIndex(lastIndex) as GroupByItem;
if (groupByItem == null)
{
throw new DataGridInternalException("groupByItem is null.");
}
groupByItem.HideDropMark();
}
var dataGridContext = DataGridControl.GetDataGridContext(this);
var dataGridControl = (dataGridContext != null) ? dataGridContext.DataGridControl : null;
GroupingHelper.AppendNewGroupFromColumnManagerCell(cell, dataGridControl);
}
internal void ShowDropMark(RelativePoint mousePosition)
{
if (m_dropMarkAdorner == null)
{
var dataGridContext = this.DataGridContext;
var grid = (dataGridContext != null) ? dataGridContext.DataGridControl : null;
Pen pen = UIViewBase.GetDropMarkPen(this);
if ((pen == null) && (grid != null))
{
UIViewBase uiViewBase = grid.GetView() as UIViewBase;
pen = uiViewBase.DefaultDropMarkPen;
}
DropMarkOrientation orientation = UIViewBase.GetDropMarkOrientation(this);
if ((orientation == DropMarkOrientation.Default) && (grid != null))
{
UIViewBase uiViewBase = grid.GetView() as UIViewBase;
orientation = uiViewBase.DefaultDropMarkOrientation;
}
m_dropMarkAdorner = new DropMarkAdorner(this, pen, orientation);
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);
if (adornerLayer != null)
{
adornerLayer.Add(m_dropMarkAdorner);
}
}
m_dropMarkAdorner.UpdateAlignment(mousePosition);
}
internal void ProcessDrop(ColumnManagerCell draggedCell, RelativePoint mousePosition)
{
var manager = default(ColumnReorderingDragSourceManager);
if (draggedCell != null)
{
manager = draggedCell.DragSourceManager as ColumnReorderingDragSourceManager;
}
if ((manager != null) && (manager.IsAnimatedColumnReorderingEnabled))
{
manager.CommitReordering();
}
else
{
this.HideDropMark();
var dataGridContext = this.DataGridContext;
Debug.Assert(dataGridContext != null);
if (dataGridContext != null)
{
var targetColumn = draggedCell.ParentColumn;
var pivotColumn = this.ParentColumn;
Debug.Assert(targetColumn != null);
Debug.Assert(pivotColumn != null);
var relativePosition = mousePosition.GetPoint(this);
var offset = Point.Subtract(mousePosition.GetPoint(draggedCell), relativePosition);
var moveBefore = true;
// We assumme the cells are layouted horizontally.
if (Math.Abs(offset.X) >= Math.Abs(offset.Y))
{
// Consider the case where the columns are layouted from left to right in reverse order.
var reverse = ((offset.X > 0d) == (targetColumn.VisiblePosition >= pivotColumn.VisiblePosition));
moveBefore = ((relativePosition.X < this.ActualWidth / 2d) != reverse);
}
// We assume the cells are layouted vertically.
else
{
// Consider the case where the columns are layouted from top to bottom in reverse order.
var reverse = ((offset.Y > 0d) == (targetColumn.VisiblePosition >= pivotColumn.VisiblePosition));
moveBefore = ((relativePosition.Y < this.ActualHeight / 2d) != reverse);
}
var success = (moveBefore)
? dataGridContext.MoveColumnBefore(targetColumn, pivotColumn)
: dataGridContext.MoveColumnAfter(targetColumn, pivotColumn);
Debug.Assert(success);
}
}
}
void IDropTarget.Drop(UIElement draggedElement, RelativePoint mousePosition)
{
var draggedCell = draggedElement as ColumnManagerCell;
if (draggedCell == null)
{
return;
}
this.ProcessDrop(draggedCell, mousePosition);
}
internal void ShowFarDropMark(ColumnManagerCell cell, RelativePoint mousePosition)
{
Debug.Assert(cell != null);
if (cell == null)
{
return;
}
DataGridContext cellDataGridContext = DataGridControl.GetDataGridContext(cell);
Debug.Assert(cellDataGridContext != null);
if (cellDataGridContext == null)
{
throw new DataGridInternalException("DataGridContext cannot be null on ColumnManagerCell.");
}
// We already have GroupLevelDescriptions for this level, we should show DropMark on the last HierarchicalGroupByItem
if (cellDataGridContext.GroupLevelDescriptions.Count > 0)
{
Debug.Assert(cellDataGridContext.GroupLevelDescriptions == this.GroupLevelDescriptions);
if (cellDataGridContext.GroupLevelDescriptions != this.GroupLevelDescriptions)
{
return;
}
int lastIndex = this.GroupLevelDescriptions.Count - 1;
// If there
if (lastIndex > -1)
{
HierarchicalGroupByItem hierarchicalGroupByItem = this.ItemContainerGenerator.ContainerFromItem(this.GroupLevelDescriptions[lastIndex]) as HierarchicalGroupByItem;
Debug.Assert(hierarchicalGroupByItem != null);
if (hierarchicalGroupByItem == null)
{
return;
}
hierarchicalGroupByItem.ShowFarDropMark(mousePosition);
}
else
{
this.ShowFarDropMark(mousePosition);
}
}
else
{
this.ShowFarDropMark(mousePosition);
}
}
internal void UpdateAlignment(RelativePoint mousePosition)
{
var relativePosition = mousePosition.GetPoint(this.AdornedElement);
var elementSize = this.AdornedElement.RenderSize;
if (m_orientation == DropMarkOrientation.Horizontal)
{
this.Alignment = (relativePosition.Y < elementSize.Height / 2d) ? DropMarkAlignment.Near : DropMarkAlignment.Far;
}
else
{
this.Alignment = (relativePosition.X < elementSize.Width / 2d) ? DropMarkAlignment.Near : DropMarkAlignment.Far;
}
}
bool IDropTarget.CanDropElement(UIElement draggedElement, RelativePoint mousePosition)
{
var allowGroupingModification = true;
var parentGBC = this.GetParentGroupByControl();
if (parentGBC != null)
{
allowGroupingModification = parentGBC.IsGroupingModificationAllowed;
}
// We don't accept any ColumnManagerCell from Details
var context = DataGridControl.GetDataGridContext(draggedElement);
var cell = draggedElement as ColumnManagerCell;
var isAlreadyGroupedBy = false;
if (cell != null)
{
isAlreadyGroupedBy = GroupingHelper.IsAlreadyGroupedBy(cell);
var parentColumn = cell.ParentColumn;
if ((parentColumn == null) || (!parentColumn.AllowGroup))
{
return(false);
}
}
var sourceDetailContext = DataGridControl.GetDataGridContext(this);
Debug.Assert(sourceDetailContext != null);
var sourceDetailConfig = (sourceDetailContext != null) ? sourceDetailContext.SourceDetailConfiguration : null;
var draggedDetailContext = DataGridControl.GetDataGridContext(draggedElement);
Debug.Assert(draggedDetailContext != null);
var draggedDetailConfig = (draggedDetailContext != null) ? draggedDetailContext.SourceDetailConfiguration : null;
var canDrop = (sourceDetailConfig == draggedDetailConfig) &&
(allowGroupingModification) &&
((draggedElement is ColumnManagerCell) || (draggedElement is GroupByItem)) &&
(draggedElement != this) &&
(isAlreadyGroupedBy == false);
if (canDrop && (cell != null))
{
canDrop = GroupingHelper.ValidateMaxGroupDescriptions(draggedDetailContext);
}
return(canDrop);
}
void IDropTarget.Drop(UIElement draggedElement, RelativePoint mousePosition)
{
var draggedCell = draggedElement as ColumnManagerCell;
if (draggedCell == null)
{
return;
}
var manager = draggedCell.DragSourceManager as ColumnReorderingDragSourceManager;
if ((manager != null) && (manager.IsAnimatedColumnReorderingEnabled))
{
manager.CommitReordering();
}
}
void IDropTarget.DragOver(UIElement draggedElement, RelativePoint mousePosition)
{
var draggedCell = draggedElement as ColumnManagerCell;
if (draggedCell != null)
{
var manager = draggedCell.DragSourceManager as ColumnReorderingDragSourceManager;
// No need for drop mark when performing animated Column reordering
if ((manager != null) && (manager.IsAnimatedColumnReorderingEnabled))
{
return;
}
}
this.ShowDropMark(mousePosition);
}
private void ShowDropMark(RelativePoint mousePosition, DropMarkAlignment defaultAlignment, bool forceDefaultAlignment)
{
if (m_dropMarkAdorner == null)
{
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this);
DataGridControl grid = (dataGridContext != null)
? dataGridContext.DataGridControl
: null;
Pen pen = UIViewBase.GetDropMarkPen(this);
if ((pen == null) && (grid != null))
{
UIViewBase uiViewBase = grid.GetView() as UIViewBase;
pen = uiViewBase.DefaultDropMarkPen;
}
DropMarkOrientation orientation = Xceed.Wpf.DataGrid.Views.UIViewBase.GetDropMarkOrientation(this);
if ((orientation == DropMarkOrientation.Default) && (grid != null))
{
UIViewBase uiViewBase = grid.GetView() as UIViewBase;
orientation = uiViewBase.DefaultDropMarkOrientation;
}
m_dropMarkAdorner = new DropMarkAdorner(this, pen, orientation);
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);
if (adornerLayer != null)
{
adornerLayer.Add(m_dropMarkAdorner);
}
}
if (forceDefaultAlignment)
{
m_dropMarkAdorner.Alignment = defaultAlignment;
}
else
{
m_dropMarkAdorner.UpdateAlignment(mousePosition);
}
}
void IDropTarget.Drop(UIElement draggedElement, RelativePoint mousePosition)
{
if (m_dropMarkAdorner == null)
{
return;
}
var dataGridContext = DataGridControl.GetDataGridContext(this);
if (dataGridContext == null)
{
return;
}
var draggedOverGroupLevelDescription = this.Content as GroupLevelDescription;
if (draggedOverGroupLevelDescription == null)
{
return;
}
var alignment = m_dropMarkAdorner.Alignment;
this.HideDropMark();
var draggedCell = draggedElement as ColumnManagerCell;
if (draggedCell != null)
{
GroupingHelper.AddNewGroupFromColumnManagerCell(draggedCell, draggedOverGroupLevelDescription, alignment, dataGridContext.DataGridControl);
}
else
{
var draggedGroupBy = draggedElement as GroupByItem;
Debug.Assert(draggedGroupBy != null);
if (draggedGroupBy != null)
{
var draggedGroupLevelDescription = draggedGroupBy.Content as GroupLevelDescription;
GroupingHelper.MoveGroupDescription(dataGridContext.Columns, dataGridContext.Items.GroupDescriptions, draggedOverGroupLevelDescription, alignment, draggedGroupLevelDescription, dataGridContext.DataGridControl);
}
}
}
bool IDropTarget.CanDropElement(UIElement draggedElement, RelativePoint mousePosition)
{
var isAlreadyGroupedBy = false;
var cell = draggedElement as ColumnManagerCell;
if (cell != null)
{
isAlreadyGroupedBy = GroupingHelper.IsAlreadyGroupedBy(cell);
var parentColumn = cell.ParentColumn;
if ((parentColumn == null) || (!parentColumn.AllowGroup))
{
return(false);
}
}
var sourceDetailContext = DataGridControl.GetDataGridContext(this);
Debug.Assert(sourceDetailContext != null);
var sourceDetailConfig = (sourceDetailContext != null) ? sourceDetailContext.SourceDetailConfiguration : null;
var draggedElementContext = DataGridControl.GetDataGridContext(draggedElement);
Debug.Assert(draggedElementContext != null);
var draggedDetailConfig = (draggedElementContext != null) ? draggedElementContext.SourceDetailConfiguration : null;
var canDrop = (sourceDetailConfig == draggedDetailConfig) &&
(sourceDetailContext != null) &&
(draggedElementContext != null) &&
(sourceDetailContext.GroupLevelDescriptions == draggedElementContext.GroupLevelDescriptions) &&
(this.IsGroupingModificationAllowed) &&
((draggedElement is ColumnManagerCell) || (draggedElement is GroupByItem)) &&
(!isAlreadyGroupedBy);
if (canDrop && (cell != null))
{
canDrop = GroupingHelper.ValidateMaxGroupDescriptions(draggedElementContext);
}
return(canDrop);
}
internal void ShowDropMark(RelativePoint mousePosition)
{
if (m_dropMarkAdorner == null)
{
var dataGridContext = DataGridControl.GetDataGridContext(this);
var dataGridControl = (dataGridContext != null) ? dataGridContext.DataGridControl : null;
var pen = UIViewBase.GetDropMarkPen(this);
if ((pen == null) && (dataGridControl != null))
{
var uiViewBase = dataGridControl.GetView() as UIViewBase;
if (uiViewBase != null)
{
pen = uiViewBase.DefaultDropMarkPen;
}
}
var orientation = UIViewBase.GetDropMarkOrientation(this);
if ((orientation == DropMarkOrientation.Default) && (dataGridControl != null))
{
var uiViewBase = dataGridControl.GetView() as UIViewBase;
if (uiViewBase != null)
{
orientation = uiViewBase.DefaultDropMarkOrientation;
}
}
m_dropMarkAdorner = new DropMarkAdorner(this, pen, orientation);
var adornerLayer = AdornerLayer.GetAdornerLayer(this);
if (adornerLayer != null)
{
adornerLayer.Add(m_dropMarkAdorner);
}
}
m_dropMarkAdorner.UpdateAlignment(mousePosition);
}
void IDropTarget.Drop(UIElement draggedElement, RelativePoint mousePosition)
{
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();
}
bool IDropTarget.CanDropElement(UIElement draggedElement, RelativePoint mousePosition)
{
bool canDrop = this.AllowGroupingModification;
ColumnManagerCell cell = null;
HierarchicalGroupByItem hierarchicalGroupByItem = null;
if (canDrop)
{
cell = draggedElement as ColumnManagerCell;
if (cell != null)
{
ColumnBase parentColumn = cell.ParentColumn;
if ((parentColumn == null) || (!parentColumn.AllowGroup))
{
return(false);
}
// Check if already grouped using the cell's DataGridContext
canDrop = !GroupingHelper.IsAlreadyGroupedBy(cell);
if (canDrop)
{
DataGridContext thisDataGridContext = DataGridControl.GetDataGridContext(this);
if (thisDataGridContext.Items != null)
{
canDrop = thisDataGridContext.Items.CanGroup;
}
if (canDrop)
{
canDrop = GroupingHelper.IsColumnManagerCellInDataGridContext(thisDataGridContext, cell);
if (canDrop == true)
{
canDrop = GroupingHelper.ValidateMaxGroupDescriptions(DataGridControl.GetDataGridContext(draggedElement));
}
}
}
}
else
{
hierarchicalGroupByItem = draggedElement as HierarchicalGroupByItem;
if (hierarchicalGroupByItem == null)
{
canDrop = false;
}
if (canDrop)
{
// Try to get the HierarchicalGroupByControlNode in which this HierarchicalGroupByItem can be added using the parent HierarchicalGroupByControl => null it can't
HierarchicalGroupByControlNode draggedHierarchicalGroupByControlNode = this.GetHierarchicalGroupByControlNodeFromHierarchicalGroupByItem(hierarchicalGroupByItem);
if (draggedHierarchicalGroupByControlNode == null)
{
canDrop = false;
}
}
}
}
bool returnedValue = ((cell != null) || (hierarchicalGroupByItem != null)) && // ColumnManagerCell or HierarchicalGroupByItem
(canDrop);
return(returnedValue);
}
void IDropTarget.DragOver(UIElement draggedElement, RelativePoint mousePosition)
{
}
internal void ShowFarDropMark(RelativePoint mousePosition)
{
this.ShowDropMark(mousePosition, DropMarkAlignment.Far, true);
}
void IDropTarget.Drop(UIElement draggedElement, RelativePoint mousePosition)
{
ColumnManagerCell draggedColumnManagerCell = draggedElement as ColumnManagerCell;
if (m_dropMarkAdorner != null)
{
GroupLevelDescription draggedOverGroupLevelDescription = this.Content as GroupLevelDescription;
DropMarkAlignment alignment = m_dropMarkAdorner.Alignment;
this.HideDropMark();
if (draggedColumnManagerCell != null)
{
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this);
DataGridControl parentGrid = (dataGridContext != null)
? dataGridContext.DataGridControl
: null;
GroupingHelper.AddNewGroupFromColumnManagerCell(draggedColumnManagerCell, draggedOverGroupLevelDescription, alignment, parentGrid);
}
else
{
HierarchicalGroupByItem draggedGroupByItem = draggedElement as HierarchicalGroupByItem;
if (draggedGroupByItem == null)
{
return;
}
GroupLevelDescription draggedGroupLevelDescription = draggedGroupByItem.Content as GroupLevelDescription;
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this);
DataGridControl parentDataGridControl = (dataGridContext != null)
? dataGridContext.DataGridControl
: null;
GroupLevelDescription destinationGroupLevelDescription = this.Content as GroupLevelDescription;
GroupingHelper.MoveGroupDescription(this.ParentColumns, this.ParentGroupDescriptions,
destinationGroupLevelDescription, alignment,
draggedGroupLevelDescription, parentDataGridControl);
}
}
else
{
// We try to add a new Group which is not in the current GroupLevelDescriptions
if (draggedColumnManagerCell == null)
{
return;
}
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this);
DataGridControl parentGrid = (dataGridContext != null)
? dataGridContext.DataGridControl
: null;
GroupingHelper.AppendNewGroupFromColumnManagerCell(draggedColumnManagerCell, parentGrid);
}
HierarchicalGroupByControl parentGBC = GroupingHelper.GetHierarchicalGroupByControl(this);
Debug.Assert(parentGBC != null);
if (parentGBC == null)
{
throw new DataGridInternalException("A hierarchical group-by item must be rooted by a HierarchicalGroupByControl.");
}
// Notify groups have changed for NoGroupContent
parentGBC.UpdateHasGroups();
}
void IDropTarget.DragOver(UIElement draggedElement, RelativePoint mousePosition)
{
ColumnManagerCell cell = draggedElement as ColumnManagerCell;
if (cell != null)
{
HierarchicalGroupByControl parentGBC = GroupingHelper.GetHierarchicalGroupByControl(this);
if (parentGBC == null)
{
throw new DataGridInternalException("The hierarchical group-by control node must be rooted by a HierarchicalGroupByControl.");
}
HierarchicalGroupByControlNode hierarchicalGroupByControlNode = parentGBC.GetHierarchicalGroupByControlNodeFromColumnManagerCell(cell);
if (hierarchicalGroupByControlNode == null)
{
throw new DataGridInternalException("A HierarchicalGroupByControlNode must exist for every level.");
}
hierarchicalGroupByControlNode.ShowFarDropMark(cell, mousePosition);
}
else
{
HierarchicalGroupByItem hierarchicalGroupByItem = draggedElement as HierarchicalGroupByItem;
if (hierarchicalGroupByItem == null)
{
return;
}
HierarchicalGroupByControlNode draggedHierarchicalGroupByControlNode = HierarchicalGroupByItem.GetParentHierarchicalGroupByControlNode(hierarchicalGroupByItem);
if (draggedHierarchicalGroupByControlNode == null)
{
throw new DataGridInternalException("draggedHierarchicalGroupByControlNode is null.");
}
if (draggedHierarchicalGroupByControlNode.GroupLevelDescriptions == this.GroupLevelDescriptions)
{
this.ShowFarDropMark(mousePosition);
}
else
{
// This HierarchicalGroupByItem does not belong this parent HierarchicalGroupByControlNode, display the DropMark on the correct one
HierarchicalGroupByControl parentGBC = GroupingHelper.GetHierarchicalGroupByControl(this);
if (parentGBC == null)
{
throw new DataGridInternalException("The hierarchical group-by control node 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.ShowFarDropMark(mousePosition);
}
}
}
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);
}
internal void ShowFarDropMark(RelativePoint mousePosition)
{
int itemsCount = this.Items.Count;
if (itemsCount < 1)
{
if (m_dropMarkAdorner == null)
{
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this);
DataGridControl grid = (dataGridContext != null)
? dataGridContext.DataGridControl
: null;
Pen pen = UIViewBase.GetDropMarkPen(this);
if ((pen == null) && (grid != null))
{
UIViewBase uiViewBase = grid.GetView() as UIViewBase;
pen = uiViewBase.DefaultDropMarkPen;
}
DropMarkOrientation orientation = UIViewBase.GetDropMarkOrientation(this);
if ((orientation == DropMarkOrientation.Default) && (grid != null))
{
UIViewBase uiViewBase = grid.GetView() as UIViewBase;
orientation = uiViewBase.DefaultDropMarkOrientation;
}
m_dropMarkAdorner = new DropMarkAdorner(this, pen, orientation);
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);
if (adornerLayer != null)
{
adornerLayer.Add(m_dropMarkAdorner);
}
}
// We Only want the drop mark to be displayed at the end of the HierarchicalGroupByControlNode
m_dropMarkAdorner.Alignment = DropMarkAlignment.Far;
}
else
{
HierarchicalGroupByItem hierarchicalGroupByItem = this.ItemContainerGenerator.ContainerFromIndex(itemsCount - 1) as HierarchicalGroupByItem;
Debug.Assert(hierarchicalGroupByItem != null);
GroupLevelDescription groupLevelDescription = hierarchicalGroupByItem.Content as GroupLevelDescription;
Debug.Assert(groupLevelDescription != null);
// Show Far DropMark only if not already grouped
if (!this.Items.Contains(groupLevelDescription))
{
hierarchicalGroupByItem.ShowFarDropMark(mousePosition);
}
}
}
private void ShowDropMark(RelativePoint mousePosition)
{
this.ShowDropMark(mousePosition, DropMarkAlignment.Far, false);
}
bool IDropTarget.CanDropElement(UIElement draggedElement, RelativePoint mousePosition)
{
ColumnManagerCell cell = null;
HierarchicalGroupByItem hierarchicalGroupByItem = null;
bool canDrop = this.AllowGroupingModification;
if (canDrop)
{
cell = draggedElement as ColumnManagerCell;
if (cell != null)
{
ColumnBase parentColumn = cell.ParentColumn;
if ((parentColumn == null) || (!parentColumn.AllowGroup))
{
return(false);
}
// Check if already grouped using the cell's DataGridContext
canDrop = !GroupingHelper.IsAlreadyGroupedBy(cell);
if (canDrop)
{
// Get the HierarchicalGroupByControl for this HierarchicalGroupByControlNode
HierarchicalGroupByControl parentGBC = GroupingHelper.GetHierarchicalGroupByControl(this);
if (parentGBC == null)
{
throw new DataGridInternalException("The hierarchical group-by control node must be rooted by a HierarchicalGroupByControl.");
}
DataGridContext parentGBCDataGridContext = DataGridControl.GetDataGridContext(parentGBC);
Debug.Assert(parentGBCDataGridContext != null);
if (parentGBCDataGridContext.Items != null)
{
canDrop = parentGBCDataGridContext.Items.CanGroup;
}
if (canDrop)
{
canDrop = GroupingHelper.IsColumnManagerCellInDataGridContext(parentGBCDataGridContext, cell);
if (canDrop == true)
{
canDrop = GroupingHelper.ValidateMaxGroupDescriptions(DataGridControl.GetDataGridContext(draggedElement));
}
}
}
}
else
{
hierarchicalGroupByItem = draggedElement as HierarchicalGroupByItem;
if (hierarchicalGroupByItem == null)
{
canDrop = false;
}
if (canDrop)
{
HierarchicalGroupByControl parentGBC = GroupingHelper.GetHierarchicalGroupByControl(this);
if (parentGBC == null)
{
throw new DataGridInternalException("The hierarchical group-by control node must be rooted by a HierarchicalGroupByControl.");
}
// Try to get the HierarchicalGroupByControlNode in which this HierarchicalGroupByItem can be added using the parent HierarchicalGroupByControl => null it can't
HierarchicalGroupByControlNode draggedHierarchicalGroupByControlNode = parentGBC.GetHierarchicalGroupByControlNodeFromHierarchicalGroupByItem(hierarchicalGroupByItem);
if (draggedHierarchicalGroupByControlNode == null)
{
canDrop = false;
}
}
}
}
bool returnedValue = ((cell != null) || (hierarchicalGroupByItem != null)) &&// ColumnManagerCell or HierarchicalGroupByItem
(canDrop);
return(returnedValue);
}
void IDropTarget.DragOver(UIElement draggedElement, RelativePoint mousePosition)
{
this.ShowDropMark(mousePosition);
}
