width property
The width of the rectangle.
Implementation
T get width => _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 changeleft.
Implementation
set width(T width) { if (width < 0) width = _clampToZero<T>(width); _width = width;}