text: // Copyright (c) 2011-2020 The Zenacoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #ifndef ZENACOIN_QT_QRIMAGEWIDGET_H
  #define ZENACOIN_QT_QRIMAGEWIDGET_H
  
  #include <QImage>
  #include <QLabel>
  
  /* Maximum allowed URI length */
  static const int MAX_URI_LENGTH = 255;
  
  /* Size of exported QR Code image */
  static constexpr int QR_IMAGE_SIZE = 300;
  static constexpr int QR_IMAGE_TEXT_MARGIN = 10;
  static constexpr int QR_IMAGE_MARGIN = 2 * QR_IMAGE_TEXT_MARGIN;
  
  QT_BEGIN_NAMESPACE
  class QMenu;
  QT_END_NAMESPACE
  
  /* Label widget for QR code. This image can be dragged, dropped, copied and saved
   * to disk.
   */
  class QRImageWidget : public QLabel
  {
      Q_OBJECT
  
  public:
      explicit QRImageWidget(QWidget *parent = nullptr);
      bool setQR(const QString& data, const QString& text = "");
      QImage exportImage();
  
  public Q_SLOTS:
      void saveImage();
      void copyImage();
  
  protected:
      virtual void mousePressEvent(QMouseEvent *event) override;
      virtual void contextMenuEvent(QContextMenuEvent *event) override;
  
  private:
      QMenu *contextMenu;
  };
  
  #endif // ZENACOIN_QT_QRIMAGEWIDGET_H
  