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/usr/include/Wt/WSpinBox is in libwt-dev 3.3.3+dfsg-4.1.

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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 WSPIN_BOX_H_
#define WSPIN_BOX_H_

#include <Wt/WAbstractSpinBox>

namespace Wt {

/*! \class WSpinBox Wt/WSpinBox Wt/WSpinBox
 *  \brief An input control for integer numbers.
 *
 * The spin box provides a control for entering an integer number. It
 * consists of a line edit, and buttons which allow to increase or
 * decrease the value. If you rather need input of a fractional
 * number, use WDoubleSpinBox instead.
 *
 * %WSpinBox is an \link WWidget::setInline(bool) inline \endlink widget.
 *
 * \sa WDoubleSpinBox
 *
 * \note A spinbox configures a validator for validating the input. Therefore
 *       you cannot set a validator yourself.
 */
class WT_API WSpinBox : public WAbstractSpinBox
{
public:
  /*! \brief Creates a spin-box.
   *
   * The range is (0 - 99) and the step size 1.
   *
   * The initial value is 0.
   */
  WSpinBox(WContainerWidget *parent = 0);

  /*! \brief Sets the minimum value.
   *
   * The default value is 0.
   */
  void setMinimum(int minimum);

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

  /*! \brief Sets the maximum value.
   *
   * The default value is 99.
   */
  void setMaximum(int maximum);

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

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

  /*! \brief Sets the step value.
   *
   * The default value is 1.
   */
  void setSingleStep(int step);

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

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

  /*! \brief Returns the value.
   */
  int 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<int>& valueChanged() { return valueChanged_; }

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

  virtual std::string jsMinMaxStep() const;
  virtual int decimals() const;
  virtual bool parseNumberValue(const std::string& text);
  virtual WT_USTRING textFromValue() const;
  virtual WValidator *createValidator();
  virtual WValidator::Result validateRange() const;

private:
  int value_, min_, max_, step_;

  Signal<int> valueChanged_;

  void onChange();
};

}

#endif // WSPIN_BOX_H_