getContent method
Implementation
Widget getContent() {
var stack = Stack( children: [
//size
EmptyView.colored( width , height, colorBackground!),
/**
* why make mode "aspectRation" behind the mode "background" ?
* - answer: i use the asset of "aspectRatio" as the placeholder
*/
Align( child: getViewMode_aspectRatio(), alignment: Alignment.center ),
//image
getViewModeBackground()
],);
var sizeBox = SizedBox(child: stack, width: width, height: height );
return sizeBox;
}