private bool IsLastSibling(SVGUnit ele)
{
SVGUnit last = GetLastSibling(ele);
if (last == null)
{
return(false);
}
return(ele.getInternalId() == last.getInternalId());
}
private bool DeleteElement(SVGUnit ele, bool bDeleteFromParent)
{
SVGErr err = new SVGErr("SvgDoc", "DeleteElement");
if (ele == null)
{
err.LogEnd(false);
return(false);
}
SVGUnit parent = ele.getParent();
if (parent == null)
{
err.Log("root node cannot be delete!", SVGErr._LogPriority.Info);
err.LogEnd(false);
return(false);
}
if (ele.getPrevious() != null)
{
ele.getPrevious().setNext(ele.getNext());
}
if (ele.getNext() != null)
{
ele.getNext().setPrevious(ele.getPrevious());
}
if (bDeleteFromParent)
{
if (IsFirstChild(ele))
{
ele.getParent().setChild(ele.getNext());
}
}
SVGUnit child = ele.getChild();
while (child != null)
{
DeleteElement(child, false);
child = child.getNext();
}
m_elements.Remove(ele.getInternalId());
err.Log(ele.ElementInfo(), SVGErr._LogPriority.Info);
err.LogEnd(true);
return(true);
}
private bool IsFirstChild(SVGUnit ele)
{
if (ele.getParent() == null)
{
return(false);
}
if (ele.getParent().getChild() == null)
{
return(false);
}
return(ele.getInternalId() == ele.getParent().getChild().getInternalId());
}
/// <summary>
/// 它将新元素eletoadd添加为给定父元素的最后一个子元素。
/// </summary>
public void AddElement(SVGUnit parent, SVGUnit eleToAdd, ref SVGUnit last)
{
SVGErr err = new SVGErr("SvgDoc", "AddElement");
if (eleToAdd == null || m_root == null)
{
err.LogEnd(false);
return;
}
SVGUnit 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)
{
// 元素是第一个子元素
parentToAdd.setChild(eleToAdd);
last = eleToAdd;
}
else
{
// 将元素添加为最后一个同级
//SvgElement last = GetLastSibling(parentToAdd.getChild());
if (last != null)
{
last.setNext(eleToAdd);
eleToAdd.setPrevious(last);
last = eleToAdd;
}
else
{
last = parentToAdd.getChild();
}
}
err.Log(eleToAdd.ElementInfo(), SVGErr._LogPriority.Info);
err.LogEnd(true);
}