void IDropTarget.DragOver(UIElement draggedElement, RelativePoint mousePosition) { ColumnManagerCell cell = draggedElement as ColumnManagerCell; if (cell != null) { DataGridContext draggedCellDataGridContext = DataGridControl.GetDataGridContext(cell); HierarchicalGroupByControlNode draggedOverHierarchicalGroupByControlNode = HierarchicalGroupByItem.GetParentHierarchicalGroupByControlNode(this); if (draggedCellDataGridContext == null) { throw new DataGridInternalException("A ColumnManagerCell must have a DataGridContext."); } if (draggedOverHierarchicalGroupByControlNode == null) { throw new DataGridInternalException("draggedOverHierarchicalGroupByControlNode is null."); } if (draggedOverHierarchicalGroupByControlNode.GroupLevelDescriptions == draggedCellDataGridContext.GroupLevelDescriptions) { this.ShowDropMark(mousePosition); } 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("The 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.ShowFarDropMark(cell, mousePosition); } } 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.ShowDropMark(mousePosition); } else { // This HierarchicalGroupByItem 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.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) { 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); }
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(); }
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.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(); } if (draggedOverHierarchicalGroupByControlNode == null) { throw new DataGridInternalException(); } 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(); } } }