예제 #1
0
        // 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());
        }
예제 #2
0
        /// <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);
        }
예제 #3
0
        /// <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);
        }
예제 #4
0
        /// <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);
        }
예제 #5
0
        /// <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);
        }
예제 #6
0
        // ---------- 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);
        }