title: how to import a svg icon to icondata
body: <p>Im new to flutter and using a plugin called FloatBoxPanel, for the property <code>panelIcon</code> a IconData is expected, I created a svg icon, now i dont know how to use it. directly usage will display error:</p>
  <pre><code>The argument type 'Icon' can't be assigned to the parameter type 'IconData'. (Documentation)
  The argument type 'SvgPicture' can't be assigned to the parameter type 'IconData'. (Documentation)
  </code></pre>
  <p>Here is part of this code, plz let me know if it is possible, thank you!!</p>
  <pre><code>              panelIcon: Icon(SvgPicture.asset(  // panelIcon 's Type:IconData
                  'assets/images/candle.svg',
                  height: 20.0,
                  width: 20.0,
                  allowDrawingOutsideViewBox: true,
                ),),
  </code></pre>