git / moonbite-core / src/qt/qrimagewidget.cpp · raw

// Copyright (c) 2011-2019 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/qrimagewidget.h>#include <qt/guiutil.h>#include <QApplication>#include <QClipboard>#include <QDrag>#include <QFontDatabase>#include <QMenu>#include <QMimeData>#include <QMouseEvent>#include <QPainter>#if defined(HAVE_CONFIG_H)#include <config/bitcoin-config.h> /* for USE_QRCODE */#endif#ifdef USE_QRCODE#include <qrencode.h>#endifQRImageWidget::QRImageWidget(QWidget *parent):    QLabel(parent), contextMenu(nullptr){    contextMenu = new QMenu(this);    QAction *saveImageAction = new QAction(tr("&Save Image..."), this);    connect(saveImageAction, &QAction::triggered, this, &QRImageWidget::saveImage);    contextMenu->addAction(saveImageAction);    QAction *copyImageAction = new QAction(tr("&Copy Image"), this);    connect(copyImageAction, &QAction::triggered, this, &QRImageWidget::copyImage);    contextMenu->addAction(copyImageAction);}bool QRImageWidget::setQR(const QString& data, const QString& text){#ifdef USE_QRCODE    setText("");    if (data.isEmpty()) return false;    // limit length    if (data.length() > MAX_URI_LENGTH) {        setText(tr("Resulting URI too long, try to reduce the text for label / message."));        return false;    }    QRcode *code = QRcode_encodeString(data.toUtf8().constData(), 0, QR_ECLEVEL_L, QR_MODE_8, 1);    if (!code) {        setText(tr("Error encoding URI into QR Code."));        return false;    }    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);    const int qr_image_size = QR_IMAGE_SIZE + (text.isEmpty() ? 0 : 2 * QR_IMAGE_MARGIN);    QImage qrAddrImage(qr_image_size, qr_image_size, QImage::Format_RGB32);    qrAddrImage.fill(0xffffff);    {        QPainter painter(&qrAddrImage);        painter.drawImage(QR_IMAGE_MARGIN, 0, qrImage.scaled(QR_IMAGE_SIZE, QR_IMAGE_SIZE));        if (!text.isEmpty()) {            QRect paddedRect = qrAddrImage.rect();            paddedRect.setHeight(QR_IMAGE_SIZE + QR_IMAGE_TEXT_MARGIN);            QFont font = GUIUtil::fixedPitchFont();            font.setStretch(QFont::SemiCondensed);            font.setLetterSpacing(QFont::AbsoluteSpacing, 1);            const qreal font_size = GUIUtil::calculateIdealFontSize(paddedRect.width() - 2 * QR_IMAGE_TEXT_MARGIN, text, font);            font.setPointSizeF(font_size);            painter.setFont(font);            painter.drawText(paddedRect, Qt::AlignBottom | Qt::AlignCenter, text);        }    }    setPixmap(QPixmap::fromImage(qrAddrImage));    return true;#else    setText(tr("QR code support not available."));    return false;#endif}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());}