FabTransformationSheetBehavior.java 文件源码

@Override
protected FabTransformationSpec onCreateMotionSpec(Context context, boolean expanded) {
  @AnimatorRes int specRes;
  if (expanded) {
    specRes = R.animator.mtrl_fab_transformation_sheet_expand_spec;
  } else {
    specRes = R.animator.mtrl_fab_transformation_sheet_collapse_spec;
  }

  FabTransformationSpec spec = new FabTransformationSpec();
  spec.timings = MotionSpec.createFromResource(context, specRes);
  spec.positioning = new Positioning(Gravity.CENTER, 0f, 0f);
  return spec;
}