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50
51#include <QtWidgets/QMessageBox>
52#include <QtWidgets/QFileDialog>
53#include <QtXmlPatterns>
54
55#include "querymainwindow.h"
56#include "xmlsyntaxhighlighter.h"
57
58//! [0]
59QueryMainWindow::QueryMainWindow()
60{
61 setupUi(this);
62
63 new XmlSyntaxHighlighter(findChild<QTextEdit*>(aName: "inputTextEdit")->document());
64 new XmlSyntaxHighlighter(findChild<QTextEdit*>(aName: "outputTextEdit")->document());
65
66 ui_defaultQueries = findChild<QComboBox*>(aName: "defaultQueries");
67 QMetaObject::connectSlotsByName(o: this);
68
69 connect(sender: ui_defaultQueries, signal: QOverload<int>::of(ptr: &QComboBox::currentIndexChanged),
70 receiver: this, slot: &QueryMainWindow::displayQuery);
71
72 loadInputFile();
73 const QStringList queries(QDir(":/files/", "*.xq").entryList());
74 for (const auto &query : queries)
75 ui_defaultQueries->addItem(atext: query);
76 if (queries.count() > 0)
77 displayQuery(index: 0);
78}
79//! [0]
80
81
82//! [1]
83void QueryMainWindow::displayQuery(int index)
84{
85 QFile queryFile(QString(":files/") + ui_defaultQueries->itemText(index));
86 queryFile.open(flags: QIODevice::ReadOnly);
87 const QString query(QString::fromLatin1(str: queryFile.readAll()));
88 findChild<QTextEdit*>(aName: "queryTextEdit")->setPlainText(query);
89
90 evaluate(str: query);
91}
92//! [1]
93
94
95void QueryMainWindow::loadInputFile()
96{
97 QFile forView;
98 forView.setFileName(":/files/cookbook.xml");
99 if (!forView.open(flags: QIODevice::ReadOnly)) {
100 QMessageBox::information(parent: this,
101 title: tr(s: "Unable to open file"), text: forView.errorString());
102 return;
103 }
104
105 QTextStream in(&forView);
106 QString inputDocument = in.readAll();
107 findChild<QTextEdit*>(aName: "inputTextEdit")->setPlainText(inputDocument);
108}
109
110
111//! [2]
112void QueryMainWindow::evaluate(const QString &str)
113{
114 QFile sourceDocument;
115 sourceDocument.setFileName(":/files/cookbook.xml");
116 sourceDocument.open(flags: QIODevice::ReadOnly);
117
118 QByteArray outArray;
119 QBuffer buffer(&outArray);
120 buffer.open(openMode: QIODevice::ReadWrite);
121
122 QXmlQuery query;
123 query.bindVariable(localName: "inputDocument", &sourceDocument);
124 query.setQuery(sourceCode: str);
125 if (!query.isValid())
126 return;
127
128 QXmlFormatter formatter(query, &buffer);
129 if (!query.evaluateTo(callback: &formatter))
130 return;
131
132 buffer.close();
133 findChild<QTextEdit*>(aName: "outputTextEdit")->setPlainText(QString::fromUtf8(str: outArray.constData()));
134
135}
136//! [2]
137
138

source code of qtxmlpatterns/examples/xmlpatterns/recipes/querymainwindow.cpp