private bool TargetIsSourceAncestor(TreeNode source, TreeNode dropNode,
ref BoundTreeNode replacementeParent, ref BoundTreeNode placeHolder)
{
if (dropNode.Parent == null)
return false;
if (source == dropNode.Parent)
{
placeHolder = dropNode as BoundTreeNode;
replacementeParent = source.Parent as BoundTreeNode;
return true;
}
return TargetIsSourceAncestor(source, dropNode.Parent, ref replacementeParent, ref placeHolder);
}
private BoundTreeNode CreateNode(int position)
{
var node = new BoundTreeNode(position);
RefreshData(node);
return node;
}
private void CheckAccess(BoundTreeNode node)
{
if (_readOnlyMember == null)
return;
node.SetNodeImages();
}
private void ChangeParentUpTheSameBranch(BoundTreeNode childnode, BoundTreeNode parentNode,
BoundTreeNode replacementeParent, BoundTreeNode placeHolder)
{
var replacementeParentId = _identifierProperty.GetValue(_listManager.List[replacementeParent.Position]);
if (replacementeParentId != null)
_parentIdentifierProperty.SetValue(_listManager.List[placeHolder.Position], replacementeParentId);
var parentId = _identifierProperty.GetValue(_listManager.List[parentNode.Position]);
if (parentId != null)
{
_parentIdentifierProperty.SetValue(_listManager.List[childnode.Position], parentId);
_listManager.EndCurrentEdit();
}
}
private void RefreshData(BoundTreeNode node)
{
var position = node.Position;
node.NodeId = _identifierProperty.GetValue(_listManager.List[position]);
if (_displayProperty != null && _listManager.List.Count > position)
{
var text = _displayProperty.GetValue(_listManager.List[position]) as string;
if (text != null)
node.Text = text;
}
node.ParentNodeId = _parentIdentifierProperty.GetValue(_listManager.List[position]);
if (_readOnlyProperty != null)
node.ReadOnly = Convert.ToBoolean(_readOnlyProperty.GetValue(_listManager.List[position]));
if (_toolTipTextProperty != null)
node.ToolTipText = Convert.ToString(_toolTipTextProperty.GetValue(_listManager.List[position]));
node.ForeColor = ForeColor;
}
private void ChangeParentToRoot(BoundTreeNode childnode)
{
if (childnode != null)
{
// ReSharper disable AssignNullToNotNullAttribute
_parentIdentifierProperty.SetValue(_listManager.List[childnode.Position], null);
// ReSharper restore AssignNullToNotNullAttribute
_listManager.EndCurrentEdit();
}
}
private void ChangeParentNoAncestor(BoundTreeNode childnode, BoundTreeNode parentNode)
{
var parentId = _identifierProperty.GetValue(_listManager.List[parentNode.Position]);
if (parentId != null)
{
_parentIdentifierProperty.SetValue(_listManager.List[childnode.Position], parentId);
_listManager.EndCurrentEdit();
}
}
private bool ModelChangeParent(BoundTreeNode childNode, BoundTreeNode parentNode)
{
if (parentNode == null)
{
if (!_allowDropOnRoot)
return false;
ChangeParentToRoot(childNode);
return true;
}
if (childNode != null)
{
if (AllowDropOnDescendents)
{
BoundTreeNode replacementeParent = null;
BoundTreeNode placeHolder = null;
if (TargetIsSourceAncestor(childNode, parentNode, ref replacementeParent, ref placeHolder))
ChangeParentUpTheSameBranch(childNode, parentNode, replacementeParent, placeHolder);
else
ChangeParentNoAncestor(childNode, parentNode);
}
else
{
if (!TargetIsSourceAncestor(childNode, parentNode))
ChangeParentNoAncestor(childNode, parentNode);
}
}
return true;
}
private bool ChangeParent(BoundTreeNode node)
{
var message = string.Empty;
var dataParentId = _parentIdentifierProperty.GetValue(_listManager.List[node.Position]);
if (dataParentId == null)
{
node.Remove();
Nodes.Add(node);
return true;
}
if (node.ParentNodeId == null || node.ParentNodeId.GetHashCode() != dataParentId.GetHashCode())
{
if (node.NodeId.GetHashCode() == dataParentId.GetHashCode())
{
message = "Node cannot be its own parent.";
}
else
{
var newParentNode = _itemsIdentifiers[dataParentId] as BoundTreeNode;
if (newParentNode == null)
{
message = "Item not found or wrong type.";
}
else
{
if (IsOwnAncestor(node, newParentNode))
{
message = "Node cannot be its own ancestor.";
}
else
{
node.Remove();
newParentNode.Nodes.Add(node);
CheckAccess(node);
SelectedNode = node;
if (SelectedNode != null)
SelectedNode.EnsureVisible();
return true;
}
}
}
}
if (message != string.Empty)
{
Logger.Warn(message);
node.NodeError = true;
return false;
}
return true;
}
private void AddNode(TreeNodeCollection nodes, BoundTreeNode node)
{
_itemsPositions.Add(node.Position, node);
_itemsIdentifiers.Add(node.NodeId, node);
nodes.Add(node);
CheckAccess(node);
}
private void AddNodeWithError(BoundTreeNode node)
{
string message;
if (_itemsIdentifiers.ContainsKey(node.NodeId))
{
node.NodeError = true;
// log and ignore node
message = string.Format(DuplicatedMessage, node.Text, node.NodeId);
Logger.Error(message);
MessageBox.Show(message, DuplicatedCaption, MessageBoxButtons.OK, MessageBoxIcon.Error);
}
else
{
if (node.NodeId.Equals(node.ParentNodeId))
message = SelfParent;
else if (!_itemsIdentifiers.ContainsKey(node.ParentNodeId))
message = InexistentParent;
else
message = GeneralNodeError;
Logger.Warn(string.Format("Node \"{0}\" - \"{1}\": {2}", node.Text, node.NodeId, message));
node.NodeError = true;
node.ForeColor = Color.Red;
node.ToolTipText = message + Environment.NewLine + node.ToolTipText;
AddNode(Nodes, node);
}
}
private bool TryAddNode(BoundTreeNode node)
{
if (!_itemsIdentifiers.ContainsKey(node.NodeId))
{
if (IsIdNull(node.ParentNodeId))
{
AddNode(Nodes, node);
return true;
}
if (_itemsIdentifiers.ContainsKey(node.ParentNodeId))
{
var parentNode = _itemsIdentifiers[node.ParentNodeId] as TreeNode;
if (parentNode != null)
{
AddNode(parentNode.Nodes, node);
return true;
}
}
}
return false;
}