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/usr/include/Wt/WDoubleSpinBox is in libwt-dev 3.1.10-1ubuntu2.

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// This may look like C code, but it's really -*- C++ -*-
/*
 * Copyright (C) 2010, 2011 Emweb bvba, Kessel-Lo, Belgium.
 *
 * See the LICENSE file for terms of use.
 */
#ifndef WDOUBLE_SPIN_BOX_H_
#define WDOUBLE_SPIN_BOX_H_

#include <Wt/WAbstractSpinBox>

namespace Wt {

/*! \class WDoubleSpinBox Wt/WDoubleSpinBox Wt/WDoubleSpinBox
 *  \brief An input control for fixed point numbers.
 *
 * The spin box provides a control for entering a fixed point
 * number. It consists of a line edit, and buttons which allow to
 * increase or decrease the value. If you rather need input of an
 * integer number number, use WDoubleSpinBox instead.
 *
 * %WDoubleSpinBox is an \link WWidget::setInline(bool) inline
 * \endlink widget.
 *
 * <h3>CSS</h3>
 *
 * See WAbstractSpinBox.
 *
 * \sa WSpinBox
 */
class WT_API WDoubleSpinBox : public WAbstractSpinBox
{
public:
  /*! \brief Creates a spin-box.
   *
   * The range is (0.0 - 99.99), the step size 1.0, and the spin box
   * has a precision of 2 decimals.
   *
   * The initial value is 0.0.
   */
  WDoubleSpinBox(WContainerWidget *parent = 0);

  /*! \brief Sets the minimum value.
   *
   * The default value is 0.0.
   */
  void setMinimum(double minimum);

  /*! \brief Returns the minimum value.
   *
   * \sa setMinimum()
   */
  double minimum() const { return min_; }

  /*! \brief Sets the maximum value.
   *
   * The default value is 99.99.
   */
  void setMaximum(double maximum);

  /*! \brief Returns the maximum value.
   *
   * \sa setMaximum()
   */
  double maximum() const { return max_; }

  /*! \brief Sets the range.
   *
   * \sa setMinimum(), setMaximum()
   */
  void setRange(double minimum, double maximum);

  /*! \brief Sets the step value.
   *
   * The default value is 1.0.
   */
  void setSingleStep(double step);

  /*! \brief Returns the step value.
   *
   * \sa setSingleStep()
   */
  double singleStep() const { return step_; }

  /*! \brief Sets the precision.
   *
   * This sets the number of digits after the decimal point shown
   *
   * The default precision is 2.
   */
  void setDecimals(int precision);

  /*! \brief Returns the precision.
   *
   * \sa setDecimals()
   */
  int decimals() const;

  /*! \brief Sets the value.
   *
   * \p value must be a value between minimum() and maximum().
   *
   * The default value is 0
   */
  void setValue(double value);

  /*! \brief Returns the value.
   */
  double value() const { return value_; }

  /*! \brief A %signal that indicates when the value has changed.
   *
   * This signal is emitted when setValue() is called.
   *
   * \sa setValue()
   */
  Signal<double>& valueChanged() { return valueChanged_; }

protected:
  virtual void updateDom(DomElement& element, bool all);
  virtual void signalConnectionsChanged();

  virtual std::string jsMinMaxStep() const;
  virtual bool parseNumberValue(const std::string& text);
  virtual WString textFromValue() const;
  virtual WValidator *createValidator();

private:
  double value_, min_, max_, step_;
  int precision_;

  Signal<double> valueChanged_;

  void onChange();
};

}

#endif // WDOUBLE_SPIN_BOX_H_