Luke Dashjr
6 years ago
parent
77851ab682
commit
fc929842c2
@ -0,0 +1,141 @@
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// Copyright (c) 2011-2018 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <qt/qrimagewidget.h>
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#include <qt/guiutil.h>
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#include <QApplication>
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#include <QClipboard>
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#include <QDrag>
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#include <QMenu>
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#include <QMimeData>
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#include <QMouseEvent>
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#include <QPainter>
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#if defined(HAVE_CONFIG_H)
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#include <config/bitcoin-config.h> /* for USE_QRCODE */
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#endif
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#ifdef USE_QRCODE
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#include <qrencode.h>
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#endif
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QRImageWidget::QRImageWidget(QWidget *parent):
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QLabel(parent), contextMenu(nullptr)
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{
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contextMenu = new QMenu(this);
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QAction *saveImageAction = new QAction(tr("&Save Image..."), this);
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connect(saveImageAction, &QAction::triggered, this, &QRImageWidget::saveImage);
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contextMenu->addAction(saveImageAction);
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QAction *copyImageAction = new QAction(tr("&Copy Image"), this);
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connect(copyImageAction, &QAction::triggered, this, &QRImageWidget::copyImage);
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contextMenu->addAction(copyImageAction);
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}
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bool QRImageWidget::setQR(const QString& data, const QString& text)
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{
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#ifdef USE_QRCODE
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setText("");
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if (data.isEmpty()) return false;
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// limit length
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if (data.length() > MAX_URI_LENGTH) {
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setText(tr("Resulting URI too long, try to reduce the text for label / message."));
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return false;
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}
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QRcode *code = QRcode_encodeString(data.toUtf8().constData(), 0, QR_ECLEVEL_L, QR_MODE_8, 1);
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if (!code) {
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setText(tr("Error encoding URI into QR Code."));
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return false;
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}
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QImage qrImage = QImage(code->width + 8, code->width + 8, QImage::Format_RGB32);
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qrImage.fill(0xffffff);
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unsigned char *p = code->data;
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for (int y = 0; y < code->width; ++y) {
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for (int x = 0; x < code->width; ++x) {
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qrImage.setPixel(x + 4, y + 4, ((*p & 1) ? 0x0 : 0xffffff));
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++p;
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}
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}
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QRcode_free(code);
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QImage qrAddrImage = QImage(QR_IMAGE_SIZE, QR_IMAGE_SIZE + (text.isEmpty() ? 0 : 20), QImage::Format_RGB32);
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qrAddrImage.fill(0xffffff);
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QPainter painter(&qrAddrImage);
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painter.drawImage(0, 0, qrImage.scaled(QR_IMAGE_SIZE, QR_IMAGE_SIZE));
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if (!text.isEmpty()) {
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QFont font = GUIUtil::fixedPitchFont();
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QRect paddedRect = qrAddrImage.rect();
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// calculate ideal font size
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qreal font_size = GUIUtil::calculateIdealFontSize(paddedRect.width() - 20, text, font);
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font.setPointSizeF(font_size);
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painter.setFont(font);
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paddedRect.setHeight(QR_IMAGE_SIZE+12);
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painter.drawText(paddedRect, Qt::AlignBottom|Qt::AlignCenter, text);
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}
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painter.end();
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setPixmap(QPixmap::fromImage(qrAddrImage));
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return true;
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#else
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setText(tr("QR code support not available."));
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return false;
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#endif
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}
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QImage QRImageWidget::exportImage()
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{
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if(!pixmap())
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return QImage();
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return pixmap()->toImage();
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}
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void QRImageWidget::mousePressEvent(QMouseEvent *event)
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{
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if(event->button() == Qt::LeftButton && pixmap())
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{
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event->accept();
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QMimeData *mimeData = new QMimeData;
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mimeData->setImageData(exportImage());
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QDrag *drag = new QDrag(this);
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drag->setMimeData(mimeData);
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drag->exec();
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} else {
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QLabel::mousePressEvent(event);
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}
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}
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void QRImageWidget::saveImage()
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{
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if(!pixmap())
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return;
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QString fn = GUIUtil::getSaveFileName(this, tr("Save QR Code"), QString(), tr("PNG Image (*.png)"), nullptr);
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if (!fn.isEmpty())
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{
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exportImage().save(fn);
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}
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}
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void QRImageWidget::copyImage()
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{
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if(!pixmap())
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return;
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QApplication::clipboard()->setImage(exportImage());
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}
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void QRImageWidget::contextMenuEvent(QContextMenuEvent *event)
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{
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if(!pixmap())
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return;
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contextMenu->exec(event->globalPos());
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}
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@ -0,0 +1,45 @@
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// Copyright (c) 2011-2018 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_QT_QRIMAGEWIDGET_H
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#define BITCOIN_QT_QRIMAGEWIDGET_H
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#include <QImage>
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#include <QLabel>
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/* Maximum allowed URI length */
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static const int MAX_URI_LENGTH = 255;
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/* Size of exported QR Code image */
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static const int QR_IMAGE_SIZE = 300;
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QT_BEGIN_NAMESPACE
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class QMenu;
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QT_END_NAMESPACE
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/* Label widget for QR code. This image can be dragged, dropped, copied and saved
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* to disk.
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*/
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class QRImageWidget : public QLabel
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{
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Q_OBJECT
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public:
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explicit QRImageWidget(QWidget *parent = nullptr);
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bool setQR(const QString& data, const QString& text = "");
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QImage exportImage();
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public Q_SLOTS:
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void saveImage();
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void copyImage();
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protected:
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virtual void mousePressEvent(QMouseEvent *event);
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virtual void contextMenuEvent(QContextMenuEvent *event);
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private:
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QMenu *contextMenu;
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};
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#endif // BITCOIN_QT_QRIMAGEWIDGET_H
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