Method spinBox

unit-tests/UI_test.cpp:41–41

	QRect rulerRect() const { return _rulerRect; }
	bool isDragging() const { return _isDragging; }
	QDoubleSpinBox * spinBox() { return _sbDPI; }
	int unit() const { return _curUnit; }
	QMenu & contextMenu() { return _contextMenu; }
};