/// <summary>
/// 它将元素在树层次结构中向上移动一级。
/// </summary>
public bool ElementLevelUp(SVGUnit ele)
{
SVGErr err = new SVGErr("SvgDoc", "ElementLevelUp");
err.Log("Element to move " + ele.ElementInfo(), SVGErr._LogPriority.Info);
SVGUnit parent = ele.getParent();
if (parent == null)
{
err.Log("Root node cannot be moved", SVGErr._LogPriority.Info);
err.LogEnd(false);
return(false);
}
if (parent.getParent() == null)
{
err.Log("An element cannot be moved up to the root", SVGErr._LogPriority.Info);
err.LogEnd(false);
return(false);
}
SVGUnit nxt = ele.getNext();
// the first child of the parent became the next
parent.setChild(nxt);
if (nxt != null)
{
nxt.setPrevious(null);
}
// get the last sibling of the parent
SVGUnit last = GetLastSibling(parent);
if (last != null)
{
last.setNext(ele);
}
ele.setParent(parent.getParent());
ele.setPrevious(last);
ele.setNext(null);
return(true);
}
/// <summary>
/// 它创建了一个新的元素，从eletoclone复制所有属性；新的
/// 元素插入到提供的父元素下。
/// </summary>
public SVGUnit CloneElement(SVGUnit parent, SVGUnit eleToClone, SVGUnit last)
{
string sOldId = eleToClone.GetAttributeStringValue(SVGAttribute._SvgAttribute.attrCore_Id);
string sNewId = sOldId;
if (sOldId != "")
{
int i = 1;
while (GetSvgElement(sNewId) != null)
{
sNewId = sOldId + "_" + i.ToString();
i++;
}
}
SVGUnit eleNew = AddElement(parent, eleToClone.getElementName(), ref last);
eleNew.CloneAttributeList(eleToClone);
if (sNewId != "")
{
eleNew.SetAttributeValue(SVGAttribute._SvgAttribute.attrCore_Id, sNewId);
}
if (eleToClone.getChild() != null)
{
eleNew.setChild(CloneElement(eleNew, eleToClone.getChild(), last));
if (eleToClone.getChild().getNext() != null)
{
eleNew.getChild().setNext(CloneElement(eleNew, eleToClone.getChild().getNext(), last));
}
}
return(eleNew);
}
/// <summary>
/// It moves the element after its current next sibling.
/// </summary>
public bool ElementPositionDown(SVGUnit ele)
{
SVGErr err = new SVGErr("SvgDoc", "ElementPositionDown");
err.Log("Element to move " + ele.ElementInfo(), SVGErr._LogPriority.Info);
SVGUnit parent = ele.getParent();
if (parent == null)
{
err.Log("Root node cannot be moved", SVGErr._LogPriority.Info);
err.LogEnd(false);
return(false);
}
if (IsLastSibling(ele))
{
err.Log("Element is already at the last sibling position", SVGErr._LogPriority.Info);
err.LogEnd(false);
return(false);
}
SVGUnit nxt = ele.getNext();
SVGUnit nxt2 = null;
SVGUnit prv = ele.getPrevious();
// fix Next
if (nxt != null)
{
nxt.setPrevious(ele.getPrevious());
nxt2 = nxt.getNext();
nxt.setNext(ele);
}
// fix Previous
if (prv != null)
{
prv.setNext(nxt);
}
// fix Element
if (IsFirstChild(ele))
{
parent.setChild(nxt);
}
ele.setPrevious(nxt);
ele.setNext(nxt2);
if (nxt2 != null)
{
nxt2.setPrevious(ele);
}
err.Log("Element moved " + ele.ElementInfo(), SVGErr._LogPriority.Info);
err.LogEnd(true);
return(true);
}