querymainwindow.cpp Example File

recipes/querymainwindow.cpp
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#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())); }