Flash apps have the same constraints as regular images: while displaying them is self-evident (just add the code), you have to cater for the files which width is bigger than that of the widget. See ”How to display an image within a widget?”

The proper way to handle this for Flash apps is much like the one for images, and media in general: use the widget.getDimensions method.

Here is an example from the simple Fireplace widget:

var Fireplace = {};
 
widget.onLoad = function() {
  var contentHtml = '';
 
  contentHtml += '<div style="margin: 0 auto;text-align:center;">';
  contentHtml += '<object type="application/x-shockwave-flash" 
    data="http://nvmodules.typhon.net/maurice/fireplace/fire.swf" 
    width="320" height="240" class="flash">';
  contentHtml += '<param name="movie" 
    value="http://nvmodules.typhon.net/maurice/fireplace/fire.swf" />';
  //contentHtml += '<param name="wmode" value="opaque" />';
  contentHtml += '<embed type="application/x-shockwave-flash"
    src="http://nvmodules.typhon.net/maurice/fireplace/fire.swf" 
    width="320" height="240"></embed>';
  contentHtml += '</object>';
  contentHtml += '</div>';
 
  widget.setBody(contentHtml);
  widget.onResize();
}
widget.onResize = function() {
  var elements = widget.body.getElementsByTagName("object");
  var flash = elements[0];
  if (flash) {
    flash.width = 1;
    flash.width = widget.body.getDimensions().width - 10;
    flash.height = Math.round(flash.width * 3/4);
  }
}

Here again, this has the added value to adapt the size of the image to that of the widget.