T width

The width of the rectangle.

Source 

T get width => _width;
void width=(T width)

Sets the width of the rectangle.

The width must be non-negative. If a negative width is supplied, it is clamped to zero.

Setting the value will change the right edge of the rectangle, but will not change left.

Source 

void set width(T width) {
  if (width < 0) width = _clampToZero<T>(width);
  _width = width;
}