23   ScrollOffset() : x_(0), y_(0) {}  in ScrollOffset()
24   ScrollOffset(float x, float y) : x_(x), y_(y) {}  in ScrollOffset()
25   explicit ScrollOffset(const Vector2dF& v) : x_(v.x()), y_(v.y()) {}  in ScrollOffset()
26   explicit ScrollOffset(const Vector2d& v) : x_(v.x()), y_(v.y()) {}  in ScrollOffset()
31   float y() const { return y_; }  in y()
32   void set_y(float y) { y_ = y; }  in set_y()
36     return x_ == 0 && y_ == 0;  in IsZero()
42     y_ += other.y_;  in Add()
49     y_ -= other.y_;  in Subtract()
53     return Vector2dF(x_ - v.x(), y_ - v.y());  in DeltaFrom()
61     y_ = y_ <= other.y_ ? y_ : other.y_;  in SetToMin()
66     y_ = y_ >= other.y_ ? y_ : other.y_;  in SetToMax()
72     y_ *= y_scale;  in Scale()
79   float y_;  variable