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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file GUI/coregui/Views/SampleDesigner/DesignerMimeData.cpp
//! @brief Implements class DesignerMimeData
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#include "GUI/coregui/Views/SampleDesigner/DesignerMimeData.h"
#include "GUI/coregui/Views/SampleDesigner/DesignerHelper.h"
#include <QBitmap>
#include <QByteArray>
#include <QDataStream>
#include <QDrag>
#include <QPainter>
#include <QPixmap>
#include <QWidget>
#include <QXmlStreamReader>
#include <iostream>
#if QT_VERSION < 0x050000
#define QStringLiteral QString
#endif
DesignerMimeData::DesignerMimeData(const QString& entryname, const QString& xmldescr, QDrag* drag)
: m_entryname(entryname), m_xmldescr(xmldescr)
{
drag->setMimeData(this);
read_xmldescr(m_xmldescr);
QByteArray itemData;
QDataStream dataStream(&itemData, QIODevice::WriteOnly);
dataStream << xmldescr;
setData("bornagain/widget", itemData);
drag->setPixmap(getPixmap(m_classname));
drag->setHotSpot(QPoint(drag->pixmap().width() / 2, drag->pixmap().height() / 2));
}
void DesignerMimeData::read_xmldescr(const QString& xmldescr)
{
QXmlStreamReader reader(xmldescr);
bool widget_found = false;
while (!reader.atEnd()) {
if (reader.readNext() == QXmlStreamReader::StartElement) {
const QStringRef name = reader.name();
if (widget_found)
reader.raiseError("Unexpected element <" + name.toString() + ">");
if (name.compare(QStringLiteral("widget"), Qt::CaseInsensitive) == 0)
read_widget(reader);
else
reader.raiseError("Unexpected element <" + name.toString() + ">");
}
}
if (reader.hasError()) {
QString errorMessage = tr("A parse error occurred at line %1, column %2 of the XML code "
"specified for the widget %3: %4\n%5")
.arg(reader.lineNumber())
.arg(reader.columnNumber())
.arg(m_entryname)
.arg(reader.errorString())
.arg(xmldescr);
std::cout << "DesignerMimeData::read_xmldescr() -> Error during parse." << std::endl;
std::cout << errorMessage.toStdString() << std::endl;
}
}
// extract class name and skip the rest
void DesignerMimeData::read_widget(QXmlStreamReader& reader)
{
for (const QXmlStreamAttribute& attribute : reader.attributes()) {
QStringRef name = attribute.name();
if (name == "class") {
m_classname = attribute.value().toString();
continue;
}
reader.raiseError("Unexpected attribute " + name.toString());
}
reader.skipCurrentElement();
}
// Execute a drag and drop operation.
Qt::DropAction DesignerMimeData::execDrag(const QString& name, const QString& xmldescr,
QWidget* dragSource)
{
if (xmldescr.size() == 0)
return Qt::IgnoreAction;
QDrag* drag = new QDrag(dragSource);
DesignerMimeData* mimeData = new DesignerMimeData(name, xmldescr, drag);
Q_UNUSED(mimeData);
const Qt::DropAction executedAction = drag->exec(Qt::CopyAction);
return executedAction;
}
QPixmap DesignerMimeData::getPixmap(const QString& name)
{
return DesignerHelper::getMimePixmap(name);
}
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