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.DragLeave(UIElement draggedElement)
{
ColumnManagerCell cell = draggedElement as ColumnManagerCell;
if (cell == null)
{
return;
}
DataGridContext draggedDetailContext = DataGridControl.GetDataGridContext(draggedElement);
int lastIndex = draggedDetailContext.GroupLevelDescriptions.Count - 1;
if (lastIndex > -1)
{
GroupByItem groupByItem = this.ItemContainerGenerator.ContainerFromIndex(lastIndex) as GroupByItem;
Debug.Assert(groupByItem != null);
if (groupByItem == null)
{
throw new DataGridInternalException("groupByItem is null.");
}
groupByItem.HideDropMark();
}
else
{
this.HideDropMark();
}
}
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));
}
private static bool CanMove(ColumnManagerCell cell)
{
if (cell == null)
{
return(false);
}
var dataGridContext = cell.DataGridContext;
if (dataGridContext == null)
{
return(false);
}
if (dataGridContext.AreDetailsFlatten)
{
// Column reordering is not allowed for a ColumnManagerCell that is located at a detail level
// when details are flatten.
if (dataGridContext.SourceDetailConfiguration != null)
{
return(false);
}
// The main column is not allowed to be reordered when details are flatten.
var parentColumn = cell.ParentColumn;
if ((parentColumn == null) || (parentColumn.IsMainColumn))
{
return(false);
}
}
return(true);
}
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();
}
bool IDropTarget.CanDropElement(UIElement draggedElement)
{
bool canDrop = false;
ColumnManagerCell draggedCell = draggedElement as ColumnManagerCell;
if (draggedCell == null)
{
return(false);
}
ColumnReorderingDragSourceManager manager = draggedCell.DragSourceManager as ColumnReorderingDragSourceManager;
if ((manager != null) && (manager.IsAnimatedColumnReorderingEnabled))
{
ColumnManagerCell cell = draggedElement as ColumnManagerCell;
if ((cell != null) && (cell.IsBeingDragged))
{
DataGridContext rowDataGridContext = DataGridControl.GetDataGridContext(this);
if ((rowDataGridContext != null) && (rowDataGridContext.Columns.Contains(cell.ParentColumn)))
{
canDrop = true;
}
}
}
return(canDrop);
}
void IDropTarget.Drop(UIElement draggedElement)
{
ColumnManagerCell draggedCell = draggedElement as ColumnManagerCell;
if (draggedCell == null)
{
return;
}
this.ProcessDrop(draggedCell);
}
internal void ProcessDrop(ColumnManagerCell draggedCell)
{
ColumnReorderingDragSourceManager manager = null;
if (draggedCell != null)
{
manager = draggedCell.DragSourceManager as ColumnReorderingDragSourceManager;
}
if ((manager != null) && (manager.IsAnimatedColumnReorderingEnabled))
{
manager.CommitReordering();
}
else
{
int oldPosition = draggedCell.ParentColumn.VisiblePosition;
int newPosition = this.ParentColumn.VisiblePosition;
if (m_dropMarkAdorner != null)
{
DropMarkAlignment alignment = m_dropMarkAdorner.Alignment;
this.HideDropMark();
if (draggedCell.ParentColumn.VisiblePosition < newPosition)
{
if (alignment == DropMarkAlignment.Near)
{
draggedCell.ParentColumn.VisiblePosition = newPosition - 1;
}
else
{
draggedCell.ParentColumn.VisiblePosition = newPosition;
}
}
else
{
if (alignment == DropMarkAlignment.Near)
{
draggedCell.ParentColumn.VisiblePosition = newPosition;
}
else
{
draggedCell.ParentColumn.VisiblePosition = newPosition + 1;
}
}
// This will force every Rows to update there layout
ColumnReorderingEventArgs e = new ColumnReorderingEventArgs(ColumnManagerCell.ColumnReorderingEvent, oldPosition, newPosition);
this.RaiseEvent(e);
}
}
}
bool IDropTarget.CanDropElement(UIElement draggedElement)
{
bool allowGroupingModification = true;
GroupByControl parentGBC = this.GetParentGroupByControl();
if (parentGBC != null)
{
allowGroupingModification = parentGBC.IsGroupingModificationAllowed;
}
// We don't accept any ColumnManagerCell from Details
DataGridContext context = DataGridControl.GetDataGridContext(draggedElement);
ColumnManagerCell cell = draggedElement as ColumnManagerCell;
bool isAlreadyGroupedBy = false;
if (cell != null)
{
isAlreadyGroupedBy = GroupingHelper.IsAlreadyGroupedBy(cell);
ColumnBase parentColumn = cell.ParentColumn;
if ((parentColumn == null) || (!parentColumn.AllowGroup))
{
return(false);
}
}
DataGridContext sourceDetailContext = DataGridControl.GetDataGridContext(this);
Debug.Assert(sourceDetailContext != null);
DetailConfiguration sourceDetailConfig = (sourceDetailContext != null) ? sourceDetailContext.SourceDetailConfiguration : null;
DataGridContext draggedDetailContext = DataGridControl.GetDataGridContext(draggedElement);
Debug.Assert(draggedDetailContext != null);
DetailConfiguration draggedDetailConfig = (draggedDetailContext != null) ? draggedDetailContext.SourceDetailConfiguration : null;
bool canDrop = (sourceDetailConfig == draggedDetailConfig) &&
(allowGroupingModification) &&
((draggedElement is ColumnManagerCell) || (draggedElement is GroupByItem)) &&
(draggedElement != this) &&
(isAlreadyGroupedBy == false);
if (canDrop && (cell != null))
{
canDrop = GroupingHelper.ValidateMaxGroupDescriptions(draggedDetailContext);
}
return(canDrop);
}
internal void ShowFarDropMark(ColumnManagerCell cell, Point 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);
}
}
void IDropTarget.Drop(UIElement draggedElement)
{
ColumnManagerCell draggedCell = draggedElement as ColumnManagerCell;
if (draggedCell == null)
{
return;
}
ColumnReorderingDragSourceManager manager = draggedCell.DragSourceManager as ColumnReorderingDragSourceManager;
if ((manager != null) && (manager.IsAnimatedColumnReorderingEnabled))
{
manager.CommitReordering();
}
}
void IDropTarget.DragLeave(UIElement draggedElement)
{
ColumnManagerCell draggedCell = draggedElement as ColumnManagerCell;
if (draggedCell != null)
{
ColumnReorderingDragSourceManager manager = draggedCell.DragSourceManager as ColumnReorderingDragSourceManager;
// No need for drop mark when performing animated Column reordering
if ((manager != null) && (manager.IsAnimatedColumnReorderingEnabled))
{
return;
}
}
this.HideDropMark();
}
void IDropTarget.DragOver(UIElement draggedElement, Point mousePosition)
{
ColumnManagerCell draggedCell = draggedElement as ColumnManagerCell;
if (draggedCell != null)
{
ColumnReorderingDragSourceManager 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 SetColumnBinding(DependencyProperty targetProperty, ColumnBase parentColumn, DependencyProperty sourceProperty)
{
if (this.HasColumnBinding(targetProperty, parentColumn, sourceProperty))
{
return;
}
var binding = ColumnManagerCell.CreateColumnBinding(parentColumn, sourceProperty);
if (binding != null)
{
BindingOperations.SetBinding(this, targetProperty, binding);
}
else
{
BindingOperations.ClearBinding(this, targetProperty);
}
}
bool IDropTarget.CanDropElement(UIElement draggedElement)
{
bool isAlreadyGroupedBy = false;
ColumnManagerCell cell = draggedElement as ColumnManagerCell;
if (cell != null)
{
isAlreadyGroupedBy = GroupingHelper.IsAlreadyGroupedBy(cell);
ColumnBase parentColumn = cell.ParentColumn;
if ((parentColumn == null) || (!parentColumn.AllowGroup))
{
return(false);
}
}
DataGridContext sourceDetailContext = DataGridControl.GetDataGridContext(this);
Debug.Assert(sourceDetailContext != null);
DetailConfiguration sourceDetailConfig = (sourceDetailContext != null) ? sourceDetailContext.SourceDetailConfiguration : null;
DataGridContext draggedDetailContext = DataGridControl.GetDataGridContext(draggedElement);
Debug.Assert(draggedDetailContext != null);
DetailConfiguration draggedDetailConfig = (draggedDetailContext != null) ? draggedDetailContext.SourceDetailConfiguration : null;
bool canDrop = (sourceDetailConfig == draggedDetailConfig) &&
(sourceDetailContext != null) &&
(draggedDetailContext != null) &&
(sourceDetailContext.GroupLevelDescriptions == draggedDetailContext.GroupLevelDescriptions) &&
(this.IsGroupingModificationAllowed) &&
((draggedElement is ColumnManagerCell) || (draggedElement is GroupByItem)) &&
(!isAlreadyGroupedBy);
if (canDrop && (cell != null))
{
canDrop = GroupingHelper.ValidateMaxGroupDescriptions(draggedDetailContext);
}
return(canDrop);
}
void IDropTarget.Drop(UIElement draggedElement)
{
if (m_dropMarkAdorner != null)
{
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this);
Debug.Assert(dataGridContext != null);
if (dataGridContext != null)
{
GroupLevelDescription draggedOverGroupLevelDescription = this.Content as GroupLevelDescription;
Debug.Assert(draggedOverGroupLevelDescription != null);
if (draggedOverGroupLevelDescription != null)
{
DropMarkAlignment alignment = m_dropMarkAdorner.Alignment;
this.HideDropMark();
ColumnManagerCell draggedCell = draggedElement as ColumnManagerCell;
if (draggedCell != null)
{
GroupingHelper.AddNewGroupFromColumnManagerCell(draggedCell, draggedOverGroupLevelDescription, alignment, dataGridContext.DataGridControl);
}
else
{
GroupByItem draggedGroupBy = draggedElement as GroupByItem;
Debug.Assert(draggedGroupBy != null);
if (draggedGroupBy != null)
{
GroupLevelDescription draggedGroupLevelDescription = draggedGroupBy.Content as GroupLevelDescription;
GroupingHelper.MoveGroupDescription(dataGridContext.Columns, dataGridContext.Items.GroupDescriptions, draggedOverGroupLevelDescription, alignment, draggedGroupLevelDescription, dataGridContext.DataGridControl);
}
}
}
}
}
}
public static bool IsAlreadyGroupedBy(ColumnManagerCell cell)
{
DataGridContext cellDataGridContext = DataGridControl.GetDataGridContext(cell);
GroupLevelDescriptionCollection cellGroupLevelDescriptions = cellDataGridContext.GroupLevelDescriptions;
bool isAlreadyGroupedBy = false;
if (cellDataGridContext != null)
{
foreach (GroupLevelDescription description in cellGroupLevelDescriptions)
{
if (description.FieldName == cell.FieldName)
{
isAlreadyGroupedBy = true;
break;
}
}
}
return(isAlreadyGroupedBy);
}
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();
}
public static void AddNewGroupFromColumnManagerCell(ColumnManagerCell cell, GroupLevelDescription draggedOverDescription, DropMarkAlignment alignment, DataGridControl parentDataGridControl)
{
if (cell == null)
{
return;
}
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(cell);
ColumnBase column = cell.ParentColumn;
if ((dataGridContext == null) ||
(parentDataGridControl == null) ||
(column == null) ||
(parentDataGridControl != dataGridContext.DataGridControl))
{
return;
}
var addGroupCommand = dataGridContext.AddGroupCommand;
if (draggedOverDescription != null)
{
var position = GroupingHelper.GetGroupDescriptionIndexFromFieldName(dataGridContext, draggedOverDescription.FieldName, alignment);
if (addGroupCommand.CanExecute(column, position))
{
addGroupCommand.Execute(column, position);
}
}
else
{
if (addGroupCommand.CanExecute(column))
{
addGroupCommand.Execute(column);
}
}
}
bool IDropTarget.CanDropElement(UIElement draggedElement)
{
bool canDrop = true;
// Check if this HierarchicalGroupByItem parent HierarchicalGroupByControlNode allows grouping modifications, default yes
HierarchicalGroupByControlNode parentHierarchicalGroupByControlNode = HierarchicalGroupByItem.GetParentHierarchicalGroupByControlNode(this);
if (parentHierarchicalGroupByControlNode != null)
{
canDrop = parentHierarchicalGroupByControlNode.IsGroupingModificationAllowed;
}
ColumnManagerCell cell = draggedElement as ColumnManagerCell;
HierarchicalGroupByItem hierarchicalGroupByItem = null;
if (canDrop)
{
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 HierarchicalGroupByItem
HierarchicalGroupByControl parentGBC = GroupingHelper.GetHierarchicalGroupByControl(parentHierarchicalGroupByControlNode);
if (parentGBC == null)
{
throw new DataGridInternalException("The hierarchical group-by item must be rooted by a HierarchicalGroupByControl.");
}
DataGridContext parentGBCDataGridContext = DataGridControl.GetDataGridContext(parentGBC);
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(parentHierarchicalGroupByControlNode);
if (parentGBC == null)
{
throw new DataGridInternalException("The hierarchical group-by item 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
(draggedElement != this) &&
(canDrop);
return(returnedValue);
}
public static bool IsColumnManagerCellInDataGridContext(DataGridContext dataGridContext, ColumnManagerCell cell)
{
DataGridContext cellDataGridContext = DataGridControl.GetDataGridContext(cell);
Debug.Assert(cellDataGridContext != null);
if ((dataGridContext != null) &&
(cellDataGridContext != null) &&
(dataGridContext.GroupLevelDescriptions == cellDataGridContext.GroupLevelDescriptions))
{
return(true);
}
return(GroupingHelper.IsGroupLevelDescriptionsInDetailConfigurations(dataGridContext.DetailConfigurations, cellDataGridContext.GroupLevelDescriptions));
}
public static void AppendNewGroupFromColumnManagerCell(ColumnManagerCell cell, DataGridControl parentDataGridControl)
{
GroupingHelper.AddNewGroupFromColumnManagerCell(cell, null, DropMarkAlignment.Far, parentDataGridControl);
}
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();
}
}
}
void IDropTarget.DragOver(UIElement draggedElement, Point 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)
{
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.Drop(UIElement draggedElement)
{
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();
}
internal HierarchicalGroupByControlNode GetHierarchicalGroupByControlNodeFromColumnManagerCell(ColumnManagerCell cell)
{
Debug.Assert(cell != null);
if (cell == null)
{
return(null);
}
DataGridContext cellDataGridContext = DataGridControl.GetDataGridContext(cell);
if (cellDataGridContext == null)
{
throw new DataGridInternalException("A DataGridContext cannot be null on ColumnManagerCell.");
}
TreeView treeView = this.GetTemplateChild(@"PART_HierarchicalGroupByControlTreeView") as TreeView;
if (treeView == null)
{
return(null);
}
if (treeView.Items.Count == 0)
{
throw new DataGridInternalException("The HierarchicalGroupByControl should contain at least one grouping level.");
}
// The first item is always the top level HierarchicalGroupByControlNode
TreeViewItem rootItem = treeView.ItemContainerGenerator.ContainerFromItem(treeView.Items[0]) as TreeViewItem;
// It may not be visible
if (rootItem == null)
{
return(null);
}
TreeViewItem dropMarkedTreeViewItem = null;
DataGridContext rootDataGridContext = rootItem.Header as DataGridContext;
if ((rootDataGridContext != null) && (rootDataGridContext.GroupLevelDescriptions == cellDataGridContext.GroupLevelDescriptions))
{
dropMarkedTreeViewItem = rootItem;
}
else
{
GroupLevelDescriptionCollection groupLevelDescriptions = cellDataGridContext.GroupLevelDescriptions;
dropMarkedTreeViewItem = HierarchicalGroupByControl.GetTreeViewItemFromGroupLevelDescriptionCollection(rootItem, groupLevelDescriptions);
}
// If null, it means the cell does not belong to this detail
if (dropMarkedTreeViewItem == null)
{
return(null);
}
ContentPresenter treeViewItemHeader = dropMarkedTreeViewItem.Template.FindName("PART_Header", dropMarkedTreeViewItem) as ContentPresenter;
// It may not be visible
if (treeViewItemHeader == null)
{
return(null);
}
HierarchicalGroupByControlNode hierarchicalGroupByControlNode = HierarchicalGroupByControl.GetHierarchicalGroupByControlNode(treeViewItemHeader);
return(hierarchicalGroupByControlNode);
}