qt - Changing the root element of an xml document (svg) -


i need work svg objects using qgraphicssvgitem sublcass.

i learning svg - , have noticed is, svg shows fine if root element <svg ..>

yet, playing w3schools samples, noticed examples embedded in html, , possible code have process both kinds (simple svg, html containing svg).

so, solution see is, extract svg element (with kids) , replace root element it.

in mind code clear:

qdomdocument _svgxml;  void setcontentfromfile(qstring filename) {     qfile file(filename);     file.open(qfile::readonly | qfile::text);     qtextstream in(&file);     qstring data = in.readall();     file.close();     _svgxml.setcontent(svgcontent);      checkroot(); }  void checkroot() {     qdomelement rootelem = _svgxml.documentelement();     recursivelycheckroot(rootelem);     qdebug(qprintable(qstring("root ") + rootelem.nodename()));     // or     qdebug(_svgxml.tobytearray()); } void recursivelycheckroot(qdomelement& rootelem) {     if(rootelem.nodename() == "svg")         return;      qdomnode n = rootelem.firstchild();     while(!n.isnull())     {       if(n.iselement())       {           qdomelement e = n.toelement();           if(e.nodename() == "svg")            {             rootelem = e; return;            }           recursivelycheckroot(e);       }       n = n.nextsibling();     }     }

the problem doesn't work. see no change.

please me extract svg element , make root... discarding else.

sample source:

<!doctype html> <html>  <body>   <svg width="400" height="150">    <defs>     <lineargradient id="grad1" y1="0%" x1="0%" y2="0%" x2="100%">      <stop offset="0%" style="stop-color:rgb(255,255,0);stop-opacity:1"/>      <stop offset="100%" style="stop-color:rgb(255,0,0);stop-opacity:1"/>     </lineargradient>    </defs>    <ellipse fill="url(#grad1)" cx="200" cy="70" rx="85" ry="55"/>    <text x="150" y="86" fill="green" font-family="verdana" font-size="45">svg</text>   sorry, browser not support inline svg.  </svg>  </body> </html>

desired result:

<svg width="400" height="150">  <defs>   <lineargradient id="grad1" y1="0%" x1="0%" y2="0%" x2="100%">    <stop offset="0%" style="stop-color:rgb(255,255,0);stop-opacity:1"/>    <stop offset="100%" style="stop-color:rgb(255,0,0);stop-opacity:1"/>   </lineargradient>  </defs>  <ellipse fill="url(#grad1)" cx="200" cy="70" rx="85" ry="55"/>  <text x="150" y="86" fill="green" font-family="verdana" font-size="45">svg</text>   sorry, browser not support inline svg.  </svg>

(the !doctype or other declarations stay)

once understood - based on robert longson's comment "once html document, html document" ... realized cannot modify existing document, had make new one.

void recursivelycheckroot(qdomelement rootelem) {     if(rootelem.nodename() == "svg")         return;      qdomnode n = rootelem.firstchild();     while(!n.isnull())     {       if(n.iselement())       {           qdomelement e = n.toelement();           if(e.nodename() == "svg")            {               qstring str;               qtextstream stream(&str);               e.save(stream, qdomnode::documentnode);               _svgxml.setcontent(str);               return;           }           recursivelycheckroot(e);       }       n = n.nextsibling();     }     }

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