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

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The actual contents of the file can be viewed below.

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// This may look like C code, but it's really -*- C++ -*-
/*
 * Copyright (C) 2008 Emweb bvba, Kessel-Lo, Belgium.
 *
 * See the LICENSE file for terms of use.
 */
#ifndef WDOUBLEVALIDATOR_H_
#define WDOUBLEVALIDATOR_H_

#include <limits>

#include <Wt/WValidator>

namespace Wt {

/*! \class WDoubleValidator Wt/WDoubleValidator Wt/WDoubleValidator
 *  \brief A validator for validating floating point user input.
 *
 * This validator checks whether user input is a double in the pre-defined
 * range.
 *
 * \if cpp
 * Usage example:
 * \code
 * Wt::WLineEdit *lineEdit = new Wt::WLineEdit(this);
 * Wt::WDoubleValidator *validator = new Wt::WDoubleValidator();
 * lineEdit->setValidator(validator);
 * lineEdit->setText("13.42");
 * \endcode
 * \endif
 *
 * <h3>i18n</h3>
 *
 * The strings used in this class can be translated by overriding
 * the default values for the following localization keys:
 * Wt.WDoubleValidator.NotANumber: Must be a number
 * Wt.WDoubleValidator.TooSmall: The number must be larger than {1}
 * Wt.WDoubleValidator.BadRange: The number must be in the range {1} to {2}
 * Wt.WDoubleValidator.TooLarge: The number must be smaller than {1}
 */
class WT_API WDoubleValidator : public WValidator
{
public:
  /*! \brief Creates a new double validator that accepts any double.
   */
  WDoubleValidator(WObject *parent = 0);

  /*! \brief Creates a new double validator that accepts double
   *         within the given range.
   */
  WDoubleValidator(double minimum, double maximum, WObject *parent = 0);

  /*! \brief Returns the bottom of the valid double range.
   */
  double bottom() const { return bottom_; }

  /*! \brief Sets the bottom of the valid double range.
   *
   * The default value is the minimum double value.
   */
  void setBottom(double bottom);

  /*! \brief Returns the top of the valid double range.
   */
  double top() const { return top_; }

  /*! \brief Sets the top of the valid double range.
   *
   * The default value is the maximum double value.
   */
  void setTop(double top);

  /*! \brief Sets the range of valid doubles.
   */
  virtual void setRange(double bottom, double top);

  /*! \brief Validates the given input.
   *
   * The input is considered valid only when it is blank for a non-mandatory
   * field, or represents a double within the valid range.
   */
  virtual State validate(WT_USTRING& input) const;

  virtual void createExtConfig(std::ostream& config) const;

  /*! \brief Sets the message to display when the input is not a number.
   *
   * The default value is "Must be a number."
   */
  void setInvalidNotANumberText(const WString& text);

  /*! \brief Returns the message displayed when the input is not a number.
   *
   * \sa setInvalidNotANumberText(const WString&)
   */
  WString invalidNotANumberText() const;

  /*! \brief Sets the message to display when the number is too small
   *
   * Depending on whether bottom() and top() are real bounds, the
   * default message is "The number must be between {1} and {2}" or
   * "The number must be larger than {1}".
   */
  void setInvalidTooSmallText(const WString& text);

  /*! \brief Returns the message displayed when the number is too small.
   *
   * \sa setInvalidTooSmallText(const WString&)
   */
  WString invalidTooSmallText() const;

  /*! \brief Sets the message to display when the number is too large
   *
   * Depending on whether bottom() and top() are real bounds, the
   * default message is "The number must be between {1} and {2}" or
   * "The number must be smaller than {2}".
   */
  void setInvalidTooLargeText(const WString& text);

  /*! \brief Returns the message displayed when the number is too large.
   *
   * \sa setInvalidTooLargeText(const WString&)
   */
  WString invalidTooLargeText() const;

  virtual std::string javaScriptValidate() const;

private:
  double bottom_;
  double top_;

  WString tooSmallText_;
  WString tooLargeText_;
  WString nanText_;

  static void loadJavaScript(WApplication *app);
};

}

#endif // WDOUBLEVALIDATOR_H_