Re: getBounds return null ...

[thomas . deweese]

Hi Vitaly,

"Vitaly Hryb" <[EMAIL PROTECTED]> wrote on 11/05/2008 10:37:19 AM:

> GraphicsNode.getBounds() returns null when it has "visibility='hidden'",

   It doesn't do that for me.  When visiblity is hidden it should return
good bounds.  If display=none then it will have no bounds.

> but why such node participate in calculation of getBounds for parent
> (CompositeGraphicsNode) if such graphics node represent text SVG node?

  A node that is only hidden should participate in the bounds calculation
for it's parent.  A node that has display none will not even appear in
the GVT tree and hence will not contribute to it's parent's bounds calc.

  See the following sample file:

<svg version="1.1" xmlns="http://www.w3.org/2000/svg";
     xmlns:xlink="http://www.w3.org/1999/xlink"; x="0px" y="0px"
     width="800" height="600" viewBox="0 0 800 600"
     onload="showBounds('t1'); showBounds('t2'); showBounds('t3'); 
             showBounds('testG'); dynChange()">

    <script type="text/ecmascript"><![CDATA[
    var SVG_NS = "http://www.w3.org/2000/svg";;
    var nullY = 20;
    function showBounds(id) {
      var root = document.getRootElement()
      var e = root.getElementById(id);
      var bbox = e.getBBox();
      var te   = document.createElementNS(SVG_NS, "text");
      te.setAttributeNS(null, "id", "tag_"+id);
      var str;
      if (bbox != null) { 
         te.setAttributeNS(null, "x", bbox.x+5);
         te.setAttributeNS(null, "y", bbox.y+bbox.height+18);
         str = (id + ": " + bbox.x + "," + bbox.y + " " +
                            bbox.width + "x" + bbox.height);
      } else {
         te.setAttributeNS(null, "x", 10);
         te.setAttributeNS(null, "y", nullY);
         nullY += 20;
         str = (id + ": " + null);
      }
      te.appendChild(document.createTextNode(str));
      root.appendChild(te);
    }

    function dynChange() {
      var root = document.getRootElement()
      root.getElementById("dt2").setAttributeNS(null, "visibility", 
"hidden");
      root.getElementById("dt3").setAttributeNS(null, "display", "none");
      showBounds("testG2");
    }

    ]]></script>
    <g font-weight="bold">
      <text id="t1" x="50" y="50">Test1</text>
      <text id="t2" x="50" y="80" visibility="hidden">Test2</text>
      <text id="t3" x="50" y="110" display="none">Test3</text>
    </g>

    <g id="testG" font-weight="bold">
      <text x="350" y="50">test2-1</text>
      <text x="350" y="80" visibility="hidden">test2-2</text>
      <text x="350" y="110" display="none">test2-3</text>
    </g>

    <g id="testG2" font-weight="bold">
      <text id="dt1" x="50" y="250">test3-1</text>
      <text id="dt2" x="50" y="280">test3-2</text>
      <text id="dt3" x="50" y="310">test3-3</text>
    </g>
</svg>