// 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 moves the element one level up in the tree hierarchy.
/// </summary>
/// <param name="ele">Element to be moved.</param>
/// <returns>
/// true if the operation succeeded.
/// </returns>
public bool ElementLevelUp(SvgElement ele)
{
ErrH err = new ErrH("SvgDoc", "ElementLevelUp");
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 (parent.getParent() == null)
{
err.Log("An element cannot be moved up to the root", ErrH._LogPriority.Info);
err.LogEnd(false);
return(false);
}
SvgElement 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
SvgElement last = GetLastSibling(parent);
if (last != null)
{
last.setNext(ele);
}
ele.setParent(parent.getParent());
ele.setPrevious(last);
ele.setNext(null);
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);
}
/// <summary>
/// It creates a SVG document reading from a file.
/// If a current document exists, it is destroyed.
/// </summary>
/// <param name="sFilename">The complete path of a valid SVG file.</param>
/// <returns>
/// true if the file is loaded successfully and it is a valid SVG document, false if the file cannot be open or if it is not
/// a valid SVG document.
/// </returns>
public bool LoadFromFile(string sFilename)
{
ErrH err = new ErrH("SvgDoc", "LoadFromFile");
err.LogParameter("sFilename", sFilename);
if (m_root != null)
{
m_root = null;
m_nNextId = 1;
m_elements.Clear();
}
bool bResult = true;
try
{
XmlTextReader reader;
reader = new XmlTextReader(sFilename);
reader.WhitespaceHandling = WhitespaceHandling.None;
reader.Normalization = false;
reader.XmlResolver = null;
reader.Namespaces = false;
string tmp;
SvgElement eleParent = null;
try
{
// parse the file and display each of the nodes.
while (reader.Read() && bResult)
{
switch (reader.NodeType)
{
case XmlNodeType.Attribute:
tmp = reader.Name;
tmp = reader.Value;
break;
case XmlNodeType.Element:
{
SvgElement ele = AddElement(eleParent, reader.Name);
if (ele == null)
{
err.Log("Svg element cannot be added. Name: " + reader.Name, ErrH._LogPriority.Warning);
bResult = false;
}
else
{
eleParent = ele;
if (reader.IsEmptyElement)
{
if (eleParent != null)
{
eleParent = eleParent.getParent();
}
}
bool bLoop = reader.MoveToFirstAttribute();
while (bLoop)
{
ele.SetAttributeValue(reader.Name, reader.Value);
bLoop = reader.MoveToNextAttribute();
}
}
}
break;
case XmlNodeType.Text:
if (eleParent != null)
{
eleParent.setElementValue(reader.Value);
}
break;
case XmlNodeType.CDATA:
err.Log("Unexpected item: " + reader.Value, ErrH._LogPriority.Warning);
break;
case XmlNodeType.ProcessingInstruction:
err.Log("Unexpected item: " + reader.Value, ErrH._LogPriority.Warning);
break;
case XmlNodeType.Comment:
err.Log("Unexpected item: " + reader.Value, ErrH._LogPriority.Warning);
break;
case XmlNodeType.XmlDeclaration:
m_sXmlDeclaration = "<?xml " + reader.Value + "?>";
break;
case XmlNodeType.Document:
err.Log("Unexpected item: " + reader.Value, ErrH._LogPriority.Warning);
break;
case XmlNodeType.DocumentType:
{
string sDTD1;
string sDTD2;
sDTD1 = reader.GetAttribute("PUBLIC");
sDTD2 = reader.GetAttribute("SYSTEM");
m_sXmlDocType = "<!DOCTYPE svg PUBLIC \"" + sDTD1 + "\" \"" + sDTD2 + "\">";
}
break;
case XmlNodeType.EntityReference:
err.Log("Unexpected item: " + reader.Value, ErrH._LogPriority.Warning);
break;
case XmlNodeType.EndElement:
if (eleParent != null)
{
eleParent = eleParent.getParent();
}
break;
} // switch
} // while
} // read try
catch (XmlException xmle)
{
err.LogException(xmle);
err.LogParameter("Line Number", xmle.LineNumber.ToString());
err.LogParameter("Line Position", xmle.LinePosition.ToString());
bResult = false;
}
catch (Exception e)
{
err.LogException(e);
bResult = false;
}
finally
{
reader.Close();
}
}
catch
{
err.LogUnhandledException();
bResult = false;
}
err.LogEnd(bResult);
return(bResult);
}
/// <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);
}
// ---------- 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);
}