/// <summary>
/// It returns a string containing current element info for logging purposes.
/// </summary>
/// <returns></returns>
public string ElementInfo()
{
string sMsg = "InternalId:" + m_nInternalId.ToString();
if (m_Parent != null)
{
sMsg += " - Parent:" + m_Parent.getInternalId().ToString();
}
if (m_Previous != null)
{
sMsg += " - Previous:" + m_Previous.getInternalId().ToString();
}
if (m_Next != null)
{
sMsg += " - Next:" + m_Next.getInternalId().ToString();
}
if (m_Child != null)
{
sMsg += " - Child:" + m_Child.getInternalId().ToString();
}
return(sMsg);
}
private bool IsLastSibling(SvgElement ele)
{
SvgElement last = GetLastSibling(ele);
if (last == null)
{
return(false);
}
return(ele.getInternalId() == last.getInternalId());
}
// returns true if the given elemebt is the first child
private bool IsFirstChild(SvgElement ele)
{
if (ele.getParent() == null)
{
return(false);
}
if (ele.getParent().getChild() == null)
{
return(false);
}
return(ele.getInternalId() == ele.getParent().getChild().getInternalId());
}
/// <summary>
/// It adds the new element eleToAdd as the last children of the given parent element.
/// </summary>
/// <param name="parent">Parent element. If null the element is added under the root.</param>
/// <param name="eleToAdd">Element to be added.</param>
public void AddElement(SvgElement parent, SvgElement eleToAdd, ref SvgElement last)
{
ErrH err = new ErrH("SvgDoc", "AddElement");
if (eleToAdd == null || m_root == null)
{
err.LogEnd(false);
return;
}
SvgElement parentToAdd = m_root;
if (parent != null)
{
parentToAdd = parent;
}
eleToAdd.setInternalId(m_nNextId++);
m_elements.Add(eleToAdd.getInternalId(), eleToAdd);
eleToAdd.setParent(parentToAdd);
if (parentToAdd.getChild() == null)
{
// the element is the first child
parentToAdd.setChild(eleToAdd);
last = eleToAdd;
}
else
{
// add the element as the last sibling
//SvgElement last = GetLastSibling(parentToAdd.getChild());
if (last != null)
{
last.setNext(eleToAdd);
eleToAdd.setPrevious(last);
last = eleToAdd;
}
else
{
last = parentToAdd.getChild();
}
}
err.Log(eleToAdd.ElementInfo(), ErrH._LogPriority.Info);
err.LogEnd(true);
}
// ---------- PUBLIC METHODS END
// ---------- PRIVATE METHODS
private bool DeleteElement(SvgElement ele, bool bDeleteFromParent)
{
ErrH err = new ErrH("SvgDoc", "DeleteElement");
if (ele == null)
{
err.LogEnd(false);
return(false);
}
SvgElement parent = ele.getParent();
if (parent == null)
{
// root node cannot be delete!
err.Log("root node cannot be delete!", ErrH._LogPriority.Info);
err.LogEnd(false);
return(false);
}
// set the Next reference of the previous
if (ele.getPrevious() != null)
{
ele.getPrevious().setNext(ele.getNext());
}
// set the Previous reference of the next
if (ele.getNext() != null)
{
ele.getNext().setPrevious(ele.getPrevious());
}
// check if the element is the first child
// the bDeleteFromParent flag is used to avoid deleting
// all parent-child relationship. This is used in the Cut
// operation where the subtree can be pasted
if (bDeleteFromParent)
{
if (IsFirstChild(ele))
{
// set the Child reference of the parent to the next
ele.getParent().setChild(ele.getNext());
}
}
// delete its children
SvgElement child = ele.getChild();
while (child != null)
{
DeleteElement(child, false);
child = child.getNext();
}
// delete the element from the colloection
m_elements.Remove(ele.getInternalId());
err.Log(ele.ElementInfo(), ErrH._LogPriority.Info);
err.LogEnd(true);
return(true);
}
