text: // Copyright (c) 2011-2017 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include <qt/receiverequestdialog.h>
  #include <qt/forms/ui_receiverequestdialog.h>
  
  #include <qt/huntcoinunits.h>
  #include <qt/guiconstants.h>
  #include <qt/guiutil.h>
  #include <qt/optionsmodel.h>
  
  #include <QClipboard>
  #include <QDrag>
  #include <QMenu>
  #include <QMimeData>
  #include <QMouseEvent>
  #include <QPixmap>
  #if QT_VERSION < 0x050000
  #include <QUrl>
  #endif
  
  #if defined(HAVE_CONFIG_H)
  #include <config/huntcoin-config.h> /* for USE_QRCODE */
  #endif
  
  #ifdef USE_QRCODE
  #include <qrencode.h>
  #endif
  
  QRImageWidget::QRImageWidget(QWidget *parent):
      QLabel(parent), contextMenu(0)
  {
      contextMenu = new QMenu(this);
      QAction *saveImageAction = new QAction(tr("&Save Image..."), this);
      connect(saveImageAction, SIGNAL(triggered()), this, SLOT(saveImage()));
      contextMenu->addAction(saveImageAction);
      QAction *copyImageAction = new QAction(tr("&Copy Image"), this);
      connect(copyImageAction, SIGNAL(triggered()), this, SLOT(copyImage()));
      contextMenu->addAction(copyImageAction);
  }
  
  QImage QRImageWidget::exportImage()
  {
      if(!pixmap())
          return QImage();
      return pixmap()->toImage();
  }
  
  void QRImageWidget::mousePressEvent(QMouseEvent *event)
  {
      if(event->button() == Qt::LeftButton && pixmap())
      {
          event->accept();
          QMimeData *mimeData = new QMimeData;
          mimeData->setImageData(exportImage());
  
          QDrag *drag = new QDrag(this);
          drag->setMimeData(mimeData);
          drag->exec();
      } else {
          QLabel::mousePressEvent(event);
      }
  }
  
  void QRImageWidget::saveImage()
  {
      if(!pixmap())
          return;
      QString fn = GUIUtil::getSaveFileName(this, tr("Save QR Code"), QString(), tr("PNG Image (*.png)"), nullptr);
      if (!fn.isEmpty())
      {
          exportImage().save(fn);
      }
  }
  
  void QRImageWidget::copyImage()
  {
      if(!pixmap())
          return;
      QApplication::clipboard()->setImage(exportImage());
  }
  
  void QRImageWidget::contextMenuEvent(QContextMenuEvent *event)
  {
      if(!pixmap())
          return;
      contextMenu->exec(event->globalPos());
  }
  
  ReceiveRequestDialog::ReceiveRequestDialog(QWidget *parent) :
      QDialog(parent),
      ui(new Ui::ReceiveRequestDialog),
      model(0)
  {
      ui->setupUi(this);
  
  #ifndef USE_QRCODE
      ui->btnSaveAs->setVisible(false);
      ui->lblQRCode->setVisible(false);
  #endif
  
      connect(ui->btnSaveAs, SIGNAL(clicked()), ui->lblQRCode, SLOT(saveImage()));
  }
  
  ReceiveRequestDialog::~ReceiveRequestDialog()
  {
      delete ui;
  }
  
  void ReceiveRequestDialog::setModel(OptionsModel *_model)
  {
      this->model = _model;
  
      if (_model)
          connect(_model, SIGNAL(displayUnitChanged(int)), this, SLOT(update()));
  
      // update the display unit if necessary
      update();
  }
  
  void ReceiveRequestDialog::setInfo(const SendCoinsRecipient &_info)
  {
      this->info = _info;
      update();
  }
  
  void ReceiveRequestDialog::update()
  {
      if(!model)
          return;
      QString target = info.label;
      if(target.isEmpty())
          target = info.address;
      setWindowTitle(tr("Request payment to %1").arg(target));
  
      QString uri = GUIUtil::formatHuntcoinURI(info);
      ui->btnSaveAs->setEnabled(false);
      QString html;
      html += "<html><font face='verdana, arial, helvetica, sans-serif'>";
      html += "<b>"+tr("Payment information")+"</b><br>";
      html += "<b>"+tr("URI")+"</b>: ";
      html += "<a href=\""+uri+"\">" + GUIUtil::HtmlEscape(uri) + "</a><br>";
      html += "<b>"+tr("Address")+"</b>: " + GUIUtil::HtmlEscape(info.address) + "<br>";
      if(info.amount)
          html += "<b>"+tr("Amount")+"</b>: " + HuntcoinUnits::formatHtmlWithUnit(model->getDisplayUnit(), info.amount) + "<br>";
      if(!info.label.isEmpty())
          html += "<b>"+tr("Label")+"</b>: " + GUIUtil::HtmlEscape(info.label) + "<br>";
      if(!info.message.isEmpty())
          html += "<b>"+tr("Message")+"</b>: " + GUIUtil::HtmlEscape(info.message) + "<br>";
      html += "<b>"+tr("InstantSend")+"</b>: " + (info.fUseInstantSend ? tr("Yes") : tr("No")) + "<br>";
      ui->outUri->setText(html);
  
  #ifdef USE_QRCODE
      ui->lblQRCode->setText("");
      if(!uri.isEmpty())
      {
          // limit URI length
          if (uri.length() > MAX_URI_LENGTH)
          {
              ui->lblQRCode->setText(tr("Resulting URI too long, try to reduce the text for label / message."));
          } else {
              QRcode *code = QRcode_encodeString(uri.toUtf8().constData(), 0, QR_ECLEVEL_L, QR_MODE_8, 1);
              if (!code)
              {
                  ui->lblQRCode->setText(tr("Error encoding URI into QR Code."));
                  return;
              }
              QImage qrImage = QImage(code->width + 8, code->width + 8, QImage::Format_RGB32);
              qrImage.fill(0xffffff);
              unsigned char *p = code->data;
              for (int y = 0; y < code->width; y++)
              {
                  for (int x = 0; x < code->width; x++)
                  {
                      qrImage.setPixel(x + 4, y + 4, ((*p & 1) ? 0x0 : 0xffffff));
                      p++;
                  }
              }
              QRcode_free(code);
  
              QImage qrAddrImage = QImage(QR_IMAGE_SIZE, QR_IMAGE_SIZE+20, QImage::Format_RGB32);
              qrAddrImage.fill(0xffffff);
              QPainter painter(&qrAddrImage);
              painter.drawImage(0, 0, qrImage.scaled(QR_IMAGE_SIZE, QR_IMAGE_SIZE));
              QFont font = GUIUtil::fixedPitchFont();
              QRect paddedRect = qrAddrImage.rect();
  
              // calculate ideal font size
              qreal font_size = GUIUtil::calculateIdealFontSize(paddedRect.width() - 20, info.address, font);
              font.setPointSizeF(font_size);
  
              painter.setFont(font);
              paddedRect.setHeight(QR_IMAGE_SIZE+12);
              painter.drawText(paddedRect, Qt::AlignBottom|Qt::AlignCenter, info.address);
              painter.end();
  
              ui->lblQRCode->setPixmap(QPixmap::fromImage(qrAddrImage));
              ui->btnSaveAs->setEnabled(true);
          }
      }
  #endif
  }
  
  void ReceiveRequestDialog::on_btnCopyURI_clicked()
  {
      GUIUtil::setClipboard(GUIUtil::formatHuntcoinURI(info));
  }
  
  void ReceiveRequestDialog::on_btnCopyAddress_clicked()
  {
      GUIUtil::setClipboard(info.address);
  }
  