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-rw-r--r--src/qt/qrimagewidget.cpp141
1 files changed, 141 insertions, 0 deletions
diff --git a/src/qt/qrimagewidget.cpp b/src/qt/qrimagewidget.cpp
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+++ b/src/qt/qrimagewidget.cpp
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+// Copyright (c) 2011-2018 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 <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>
+#endif
+
+QRImageWidget::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);
+
+ QImage qrAddrImage = QImage(QR_IMAGE_SIZE, QR_IMAGE_SIZE + (text.isEmpty() ? 0 : 20), QImage::Format_RGB32);
+ qrAddrImage.fill(0xffffff);
+ QPainter painter(&qrAddrImage);
+ painter.drawImage(0, 0, qrImage.scaled(QR_IMAGE_SIZE, QR_IMAGE_SIZE));
+
+ if (!text.isEmpty()) {
+ QFont font = GUIUtil::fixedPitchFont();
+ QRect paddedRect = qrAddrImage.rect();
+
+ // calculate ideal font size
+ qreal font_size = GUIUtil::calculateIdealFontSize(paddedRect.width() - 20, text, font);
+ font.setPointSizeF(font_size);
+
+ painter.setFont(font);
+ paddedRect.setHeight(QR_IMAGE_SIZE+12);
+ painter.drawText(paddedRect, Qt::AlignBottom|Qt::AlignCenter, text);
+ }
+
+ painter.end();
+ 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());
+}