querymainwindow.cpp Example File
recipes/querymainwindow.cpp
#include <QtWidgets/QMessageBox>
#include <QtWidgets/QFileDialog>
#include <QtXmlPatterns>
#include "querymainwindow.h"
#include "xmlsyntaxhighlighter.h"
QueryMainWindow::QueryMainWindow()
{
setupUi(this);
new XmlSyntaxHighlighter(findChild<QTextEdit*>("inputTextEdit")->document());
new XmlSyntaxHighlighter(findChild<QTextEdit*>("outputTextEdit")->document());
ui_defaultQueries = findChild<QComboBox*>("defaultQueries");
QMetaObject::connectSlotsByName(this);
connect(ui_defaultQueries, QOverload<int>::of(&QComboBox::currentIndexChanged),
this, &QueryMainWindow::displayQuery);
loadInputFile();
const QStringList queries(QDir(":/files/", "*.xq").entryList());
for (const auto &query : queries)
ui_defaultQueries->addItem(query);
if (queries.count() > 0)
displayQuery(0);
}
void QueryMainWindow::displayQuery(int index)
{
QFile queryFile(QString(":files/") + ui_defaultQueries->itemText(index));
queryFile.open(QIODevice::ReadOnly);
const QString query(QString::fromLatin1(queryFile.readAll()));
findChild<QTextEdit*>("queryTextEdit")->setPlainText(query);
evaluate(query);
}
void QueryMainWindow::loadInputFile()
{
QFile forView;
forView.setFileName(":/files/cookbook.xml");
if (!forView.open(QIODevice::ReadOnly)) {
QMessageBox::information(this,
tr("Unable to open file"), forView.errorString());
return;
}
QTextStream in(&forView);
QString inputDocument = in.readAll();
findChild<QTextEdit*>("inputTextEdit")->setPlainText(inputDocument);
}
void QueryMainWindow::evaluate(const QString &str)
{
QFile sourceDocument;
sourceDocument.setFileName(":/files/cookbook.xml");
sourceDocument.open(QIODevice::ReadOnly);
QByteArray outArray;
QBuffer buffer(&outArray);
buffer.open(QIODevice::ReadWrite);
QXmlQuery query;
query.bindVariable("inputDocument", &sourceDocument);
query.setQuery(str);
if (!query.isValid())
return;
QXmlFormatter formatter(query, &buffer);
if (!query.evaluateTo(&formatter))
return;
buffer.close();
findChild<QTextEdit*>("outputTextEdit")->setPlainText(QString::fromUtf8(outArray.constData()));
}