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qrcode support by html tooltip

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agilob 2015-03-07 12:40:45 +00:00
parent bd12381bea
commit 4b1c5e80e9
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3 changed files with 118 additions and 0 deletions

87
src/misc/qrwidget.cpp Normal file
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@ -0,0 +1,87 @@
#include "qrwidget.h"
#include <QPainter>
#include <QDebug>
#include <QBuffer>
#include <QImage>
#include "qrcodewindow.h"
#include "qrencode.h"
QRWidget::QRWidget(QWidget *parent) : QWidget(parent), data("0")
//Note: The encoding fails with empty string so I just default to something else. Use the setQRData() call to change this.
{
//size of the qimage might be problematic in the future, but it works for me
size.setWidth(480);
size.setHeight(480);
image = new QImage(size, QImage::Format_RGB32);
}
void QRWidget::setQRData(QString data)
{
this->data = data;
paintImage();
}
QString QRWidget::getImageAsText()
{
paintImage();
QByteArray ba;
QBuffer buffer(&ba);
buffer.open(QIODevice::WriteOnly);
image->save(&buffer, "PNG"); // writes the image in PNG format inside the buffer
QString iconBase64 = QString::fromLatin1(ba.toBase64().data());
QString base64Image = "<img width=\"350\" heigth=\"350\" src=\"data:image/png;base64," + iconBase64 +"\" />";
return QString(base64Image);
}
//http://stackoverflow.com/questions/21400254/how-to-draw-a-qr-code-with-qt-in-native-c-c
void QRWidget::paintImage()
{
QPainter painter(image);
//NOTE: I have hardcoded some parameters here that would make more sense as variables.
QRcode *qr = QRcode_encodeString(data.toStdString().c_str(), 1, QR_ECLEVEL_L, QR_MODE_8, 0);
if(0 != qr)
{
QColor fg("black");
QColor bg("white");
painter.setBrush(bg);
painter.setPen(Qt::NoPen);
painter.drawRect(0, 0, size.width(), size.height());
painter.setBrush(fg);
const int s = qr->width>0 ? qr->width : 1;
const double w = width();
const double h = height();
const double aspect = w / h;
const double scale = ((aspect > 1.0) ? h : w) / s;
for(int y = 0; y < s; y++)
{
const int yy = y * s;
for(int x = 0; x < s; x++)
{
const int xx = yy + x;
const unsigned char b = qr->data[xx];
if(b & 0x01)
{
const double rx1 = x * scale,
ry1 = y * scale;
QRectF r(rx1, ry1, scale, scale);
painter.drawRects(&r, 1);
}
}
}
QRcode_free(qr);
painter.save();
}
else
{
QColor error("red");
painter.setBrush(error);
painter.drawRect(0, 0, width(), height());
qDebug() << "QR FAIL: " << strerror(errno);
}
qr = 0;
}

24
src/misc/qrwidget.h Normal file
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@ -0,0 +1,24 @@
#ifndef QRWIDGET_H
#define QRWIDGET_H
// https://stackoverflow.com/questions/21400254/how-to-draw-a-qr-code-with-qt-in-native-c-c
#include <QWidget>
class QRWidget : public QWidget
{
Q_OBJECT
public:
explicit QRWidget(QWidget *parent = 0);
void setQRData(QString data);
QString getImageAsText();
private:
QString data;
void paintImage();
QImage *image;
QSize size;
};
#endif // QRWIDGET_H

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@ -30,6 +30,8 @@
#include <QClipboard>
#include <QInputDialog>
#include <QFileDialog>
#include "src/misc/qrwidget.h"
#include "qrencode.h"
IdentityForm::IdentityForm() :
GenericForm(tr("Identity"), QPixmap(":/img/settings/identity.png"))
@ -126,6 +128,11 @@ void IdentityForm::setToxId(const QString& id)
{
toxId->setText(id);
toxId->setCursorPosition(0);
QRWidget *qrcode = new QRWidget();
qrcode->setQRData(id);
toxId->setToolTip(qrcode->getImageAsText());
}
void IdentityForm::onLoadClicked()