filter property

ImageFilter filter

The image filter to apply to the existing painted content before painting the child.

For example, consider using new ui.ImageFilter.blur to create a backdrop blur effect.

Implementation 

ui.ImageFilter get filter => _filter;
void filter= (ImageFilter value)

Implementation 

set filter(ui.ImageFilter value) {
  assert(value != null);
  if (_filter == value)
    return;
  _filter = value;
  markNeedsPaint();
}