private void value_RowDeleting(object sender, DataRowChangeEventArgs e)
{
TreeNodeBound node = (TreeNodeBound)_nodesByValueMember[e.Row[this._valueMember]];
_nodesByValueMember.Remove(node);
if (node.TreeView != null)
{
node.Remove();
}
}
private void LoadTree()
{
if (this._datasource != null && this._displayMember != null && this._valueMember != null && this._parentMember != null)
{
Clear();
if (this.ComboTreeType != ComboTreeType.None)
{
TreeNodeBound nullnode = new TreeNodeBound(this.TypeText);
nullnode.Value = this.ComboTreeType.ToString();
nullnode.Name = nullnode.Value.ToString();
nullnode.ParentValue = this.ComboTreeType.ToString();
this.Nodes.Add(nullnode);
}
foreach (DataRow dr in this._datasource.Rows)
{
TreeNodeBound node = new TreeNodeBound(dr[this._displayMember].ToString());
node.Value = dr[this._valueMember];
node.Name = node.Value.ToString();
node.ParentValue = dr[this._parentMember];
_nodesByValueMember.Add(node);
}
foreach (TreeNodeBound node in _nodesByValueMember)
{
if ((node.ParentValue == _rootParentValue) || (node.ParentValue.ToString() == node.Value.ToString()))
{
//the node is a Root, add it to the root collection
this.Nodes.Add(node);
}
else
{
//look for the parent
TreeNodeBound parent = (TreeNodeBound)_nodesByValueMember[node.ParentValue];
if (parent != null)
{
//add it to the nodes collection of the parent node
parent.Nodes.Add(node);
}
else
{
throw new ArgumentException("Node with Value = " + Convert.ToString(node.ParentValue) + " does not exist. The referencing node has a value = " + Convert.ToString(node.Value) + ". Check your datasource integrity.");
}
}
}
}
}
private void value_RowChanged(object sender, DataRowChangeEventArgs e)
{
if (e.Action == DataRowAction.Add)
{
if (e.Row[this._valueMember] != DBNull.Value)
{
TreeNodeBound node = new TreeNodeBound(e.Row[this.DisplayMember].ToString());
node.Value = e.Row[this._valueMember];
node.ParentValue = e.Row[this._parentMember];
_nodesByValueMember.Add(node);
if (node.ParentValue == _rootParentValue)
{
//Its a root
this.Nodes.Add(node);
}
else if (_nodesByValueMember[node.ParentValue] != null)
{
//The parent exist
TreeNodeBound parent = (TreeNodeBound)_nodesByValueMember[node.ParentValue];
if (parent != null)
{
parent.Nodes.Add(node);
}
else
{
throw new ArgumentException("Node with Value = " + Convert.ToString(node.ParentValue) + " does not exist. The referencing node has a value = " + Convert.ToString(node.Value) + ". Check your datasource integrity.");
}
if (parent.IsVisible)
{
parent.Expand();
}
}
}
}
else if (e.Action == DataRowAction.Change)
{
TreeNodeBound node = (TreeNodeBound)_nodesByValueMember[e.Row[this._valueMember]];
object actualParent = e.Row[this._parentMember].ToString();
//Change parenthood
if (actualParent.ToString() != node.ParentValue.ToString())
{
if (node.ParentValue != _rootParentValue)
{
TreeNodeBound oldParent = (TreeNodeBound)_nodesByValueMember[node.ParentValue];
if (oldParent != null)
{
oldParent.Nodes.Remove(node);
}
}
else
{
//Remove it from the root nodes
this.Nodes.Remove(node);
}
node.ParentValue = e.Row[this._parentMember];
if (node.ParentValue != _rootParentValue)
{
TreeNodeBound newParent = (TreeNodeBound)_nodesByValueMember[node.ParentValue];
if (newParent != null) //if exist
{
newParent.Nodes.Add(node);
if (newParent.IsVisible)
{
newParent.Expand();
}
}
}
else
{
this.Nodes.Add(node);
}
}
//Change the text
node.Text = e.Row[this.DisplayMember].ToString();
}
}
