getTransformFrom method

Matrix4 getTransformFrom(
  1. Selectable child

Gets the paint transform from the Selectable child to SelectionContainer of this delegate.

Returns a matrix that maps the Selectable paint coordinate system to the coordinate system of SelectionContainer.

Can only be called after SelectionContainer is laid out.


Matrix4 getTransformFrom(Selectable child) {
    _selectionContainerContext?.findRenderObject() != null,
    'getTransformFrom cannot be called before SelectionContainer is laid out.',
  return child.getTransformTo(_selectionContainerContext!.findRenderObject()! as RenderBox);