text: // Copyright (c) 2011-2015 The Tcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #ifndef TCOIN_QT_TCOINAMOUNTFIELD_H
  #define TCOIN_QT_TCOINAMOUNTFIELD_H
  
  #include "amount.h"
  
  #include <QWidget>
  
  class AmountSpinBox;
  
  QT_BEGIN_NAMESPACE
  class QValueComboBox;
  QT_END_NAMESPACE
  
  /** Widget for entering tcoin amounts.
    */
  class TcoinAmountField: public QWidget
  {
      Q_OBJECT
  
      // ugly hack: for some unknown reason CAmount (instead of qint64) does not work here as expected
      // discussion: https://github.com/tcoin/tcoin/pull/5117
      Q_PROPERTY(qint64 value READ value WRITE setValue NOTIFY valueChanged USER true)
  
  public:
      explicit TcoinAmountField(QWidget *parent = 0);
  
      CAmount value(bool *value=0) const;
      void setValue(const CAmount& value);
  
      /** Set single step in satoshis **/
      void setSingleStep(const CAmount& step);
  
      /** Make read-only **/
      void setReadOnly(bool fReadOnly);
  
      /** Mark current value as invalid in UI. */
      void setValid(bool valid);
      /** Perform input validation, mark field as invalid if entered value is not valid. */
      bool validate();
  
      /** Change unit used to display amount. */
      void setDisplayUnit(int unit);
  
      /** Make field empty and ready for new input. */
      void clear();
  
      /** Enable/Disable. */
      void setEnabled(bool fEnabled);
  
      /** Qt messes up the tab chain by default in some cases (issue https://bugreports.qt-project.org/browse/QTBUG-10907),
          in these cases we have to set it up manually.
      */
      QWidget *setupTabChain(QWidget *prev);
  
  Q_SIGNALS:
      void valueChanged();
  
  protected:
      /** Intercept focus-in event and ',' key presses */
      bool eventFilter(QObject *object, QEvent *event);
  
  private:
      AmountSpinBox *amount;
      QValueComboBox *unit;
  
  private Q_SLOTS:
      void unitChanged(int idx);
  
  };
  
  #endif // TCOIN_QT_TCOINAMOUNTFIELD_H
  