/// <summary>
/// It moves the element before its current previous sibling.
/// </summary>
/// <param name="ele">Element to be moved.</param>
/// <returns>
/// true if the operation succeeded.
/// </returns>
public bool ElementPositionUp(SvgElement ele)
{
ErrH err = new ErrH("SvgDoc", "ElementPositionUp");
err.Log("Element to move " + ele.ElementInfo(), ErrH._LogPriority.Info);
SvgElement parent = ele.getParent();
if (parent == null)
{
err.Log("Root node cannot be moved", ErrH._LogPriority.Info);
err.LogEnd(false);
return(false);
}
if (IsFirstChild(ele))
{
err.Log("Element is already at the first position", ErrH._LogPriority.Info);
err.LogEnd(false);
return(false);
}
SvgElement nxt = ele.getNext();
SvgElement prv = ele.getPrevious();
SvgElement prv2 = null;
ele.setNext(null);
ele.setPrevious(null);
// fix Next
if (nxt != null)
{
nxt.setPrevious(prv);
}
// fix Previous
if (prv != null)
{
prv.setNext(nxt);
prv2 = prv.getPrevious();
prv.setPrevious(ele);
// check if the Previous is the first child
if (IsFirstChild(prv))
{
// if yes the moved element has to became the new first child
if (prv.getParent() != null)
{
prv.getParent().setChild(ele);
}
}
}
// fix Previous/Previous
if (prv2 != null)
{
prv2.setNext(ele);
}
// fix Element
ele.setNext(prv);
ele.setPrevious(prv2);
err.Log("Element moved " + ele.ElementInfo(), ErrH._LogPriority.Info);
err.LogEnd(true);
return(true);
}
/// <summary>
/// It moves the element after its current next sibling.
/// </summary>
/// <param name="ele">Element to be moved.</param>
/// <returns>
/// true if the operation succeeded.
/// </returns>
public bool ElementPositionDown(SvgElement ele)
{
ErrH err = new ErrH("SvgDoc", "ElementPositionDown");
err.Log("Element to move " + ele.ElementInfo(), ErrH._LogPriority.Info);
SvgElement parent = ele.getParent();
if (parent == null)
{
err.Log("Root node cannot be moved", ErrH._LogPriority.Info);
err.LogEnd(false);
return(false);
}
if (IsLastSibling(ele))
{
err.Log("Element is already at the last sibling position", ErrH._LogPriority.Info);
err.LogEnd(false);
return(false);
}
SvgElement nxt = ele.getNext();
SvgElement nxt2 = null;
SvgElement 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(), ErrH._LogPriority.Info);
err.LogEnd(true);
return(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);
}
