/// <summary>
/// Creates a Link object and connects the tail port and head
/// port of the link.
/// </summary>
/// <param name="cmdTarget">Parent node to add the link to</param>
/// <returns>true if successful, otherwise false</returns>
/// <remarks>
/// If the <see cref="Syncfusion.Windows.Forms.Diagram.LinkCmd.Link"/>
/// property is null when this method is called, then a new Link object
/// is created by invoking the
/// <see cref="Syncfusion.Windows.Forms.Diagram.LinkCmd.LinkFactory"/>
/// delegate. The Link object is then added to the node passed in the
/// cmdTarget parameter. Next, the tail of the link is connected to the
/// <see cref="Syncfusion.Windows.Forms.Diagram.LinkCmd.SourcePort"/>
/// and the head of the link is connected to the
/// <see cref="Syncfusion.Windows.Forms.Diagram.LinkCmd.TargetPort"/>.
/// <seealso cref="Syncfusion.Windows.Forms.Diagram.LinkCmd.LinkFactory"/>
/// </remarks>
public bool Do(object cmdTarget)
{
bool success = false;
ICompositeNode parentNode = null;
int childIdx;
if (this.link == null)
{
this.link = this.linkFactory(this.points);
}
if (this.link != null)
{
parentNode = cmdTarget as ICompositeNode;
if (parentNode != null)
{
childIdx = parentNode.AppendChild(this.link);
if (this.sourcePort != null)
{
this.link.ConnectTail(this.sourcePort);
}
if (this.targetPort != null)
{
this.link.ConnectHead(this.targetPort);
}
success = true;
}
}
return(success);
}
/// <summary>
///
/// </summary>
/// <param name="cmdTarget"></param>
/// <returns></returns>
public override bool Do(object cmdTarget)
{
bool success = false;
ICompositeNode parentNode = cmdTarget as ICompositeNode;
if (parentNode != null)
{
foreach (INode curNode in this.Nodes)
{
int childIdx = parentNode.GetChildIndex(curNode);
int newIdx;
int childCount;
if (childIdx >= 0)
{
parentNode.RemoveChild(childIdx);
}
switch (this.updType)
{
case ZOrderUpdate.Front:
parentNode.AppendChild(curNode);
break;
case ZOrderUpdate.Back:
parentNode.InsertChild(curNode, 0);
break;
case ZOrderUpdate.Forward:
childCount = parentNode.ChildCount;
newIdx = (childIdx < childCount) ? (childIdx + 1) : (childCount);
parentNode.InsertChild(curNode, newIdx);
break;
case ZOrderUpdate.Backward:
newIdx = (childIdx > 0) ? (childIdx - 1) : (0);
parentNode.InsertChild(curNode, newIdx);
break;
}
}
}
return(success);
}
/// <summary>
///
/// </summary>
/// <param name="cmdTarget"></param>
/// <returns></returns>
public override bool Do(object cmdTarget)
{
bool success = false;
ICompositeNode parentNode = null;
Group curGroup;
ICompositeNode curParent;
int childIdx;
int newIdx;
INode curChild;
parentNode = cmdTarget as ICompositeNode;
if (parentNode != null)
{
IEnumerator nodeEnum = this.Nodes.GetEnumerator();
while (nodeEnum.MoveNext())
{
curGroup = nodeEnum.Current as Group;
if (curGroup != null)
{
curParent = curGroup.Parent;
if (curParent != null)
{
childIdx = curParent.GetChildIndex(curGroup);
if (childIdx >= 0)
{
curParent.RemoveChild(childIdx);
}
}
for (childIdx = 0; childIdx < curGroup.ChildCount; childIdx++)
{
curChild = curGroup.GetChild(childIdx);
newIdx = parentNode.AppendChild(curChild);
}
}
}
success = true;
}
return(success);
}
/// <summary>
/// Destroys the group created by executing the command and restores
/// the nodes to their original parent.
/// </summary>
/// <returns>true if successful, otherwise false</returns>
public override bool Undo()
{
bool success = false;
if (this.group != null && this.groupParent != null)
{
NodeCollection groupMembers = new NodeCollection();
for (int childIdx = 0; childIdx < this.group.ChildCount; childIdx++)
{
INode curChild = this.group.GetChild(childIdx);
if (curChild != null)
{
groupMembers.Add(curChild);
}
}
int groupChildIdx = this.groupParent.GetChildIndex(this.group);
if (groupChildIdx >= 0)
{
this.groupParent.RemoveChild(groupChildIdx);
}
this.group.RemoveAllChildren();
this.group = null;
foreach (INode curChild in groupMembers)
{
ICompositeNode curParent = null;
if (this.parentMap.Contains(curChild))
{
curParent = (ICompositeNode)this.parentMap[curChild];
curParent.AppendChild(curChild);
}
}
success = true;
}
return(success);
}
