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<h1 class="title">querymainwindow.cpp Example File</h1>
<span class="subtitle">recipes/querymainwindow.cpp</span>
<!-- $$$recipes/querymainwindow.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
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** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
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<span class="preprocessor">#include <QtWidgets/QMessageBox></span>
<span class="preprocessor">#include <QtWidgets/QFileDialog></span>
<span class="preprocessor">#include <QtXmlPatterns></span>
<span class="preprocessor">#include "querymainwindow.h"</span>
<span class="preprocessor">#include "xmlsyntaxhighlighter.h"</span>
QueryMainWindow<span class="operator">::</span>QueryMainWindow()
{
setupUi(<span class="keyword">this</span>);
<span class="keyword">new</span> XmlSyntaxHighlighter(findChild<span class="operator"><</span><span class="type">QTextEdit</span><span class="operator">*</span><span class="operator">></span>(<span class="string">"inputTextEdit"</span>)<span class="operator">-</span><span class="operator">></span>document());
<span class="keyword">new</span> XmlSyntaxHighlighter(findChild<span class="operator"><</span><span class="type">QTextEdit</span><span class="operator">*</span><span class="operator">></span>(<span class="string">"outputTextEdit"</span>)<span class="operator">-</span><span class="operator">></span>document());
ui_defaultQueries <span class="operator">=</span> findChild<span class="operator"><</span><span class="type">QComboBox</span><span class="operator">*</span><span class="operator">></span>(<span class="string">"defaultQueries"</span>);
<span class="type">QMetaObject</span><span class="operator">::</span>connectSlotsByName(<span class="keyword">this</span>);
connect(ui_defaultQueries<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type">QComboBox</span><span class="operator">::</span>currentIndexChanged)<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>QueryMainWindow<span class="operator">::</span>displayQuery);
loadInputFile();
<span class="keyword">const</span> <span class="type">QStringList</span> queries(<span class="type">QDir</span>(<span class="string">":/files/"</span><span class="operator">,</span> <span class="string">"*.xq"</span>)<span class="operator">.</span>entryList());
<span class="keyword">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span> <span class="operator">&</span>query : queries)
ui_defaultQueries<span class="operator">-</span><span class="operator">></span>addItem(query);
<span class="keyword">if</span> (queries<span class="operator">.</span>count() <span class="operator">></span> <span class="number">0</span>)
displayQuery(<span class="number">0</span>);
}
<span class="type">void</span> QueryMainWindow<span class="operator">::</span>displayQuery(<span class="type">int</span> index)
{
<span class="type">QFile</span> queryFile(<span class="type">QString</span>(<span class="string">":files/"</span>) <span class="operator">+</span> ui_defaultQueries<span class="operator">-</span><span class="operator">></span>itemText(index));
queryFile<span class="operator">.</span>open(<span class="type">QIODevice</span><span class="operator">::</span>ReadOnly);
<span class="keyword">const</span> <span class="type">QString</span> query(<span class="type">QString</span><span class="operator">::</span>fromLatin1(queryFile<span class="operator">.</span>readAll()));
findChild<span class="operator"><</span><span class="type">QTextEdit</span><span class="operator">*</span><span class="operator">></span>(<span class="string">"queryTextEdit"</span>)<span class="operator">-</span><span class="operator">></span>setPlainText(query);
evaluate(query);
}
<span class="type">void</span> QueryMainWindow<span class="operator">::</span>loadInputFile()
{
<span class="type">QFile</span> forView;
forView<span class="operator">.</span>setFileName(<span class="string">":/files/cookbook.xml"</span>);
<span class="keyword">if</span> (<span class="operator">!</span>forView<span class="operator">.</span>open(<span class="type">QIODevice</span><span class="operator">::</span>ReadOnly)) {
<span class="type">QMessageBox</span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span>
tr(<span class="string">"Unable to open file"</span>)<span class="operator">,</span> forView<span class="operator">.</span>errorString());
<span class="keyword">return</span>;
}
<span class="type">QTextStream</span> in(<span class="operator">&</span>forView);
<span class="type">QString</span> inputDocument <span class="operator">=</span> in<span class="operator">.</span>readAll();
findChild<span class="operator"><</span><span class="type">QTextEdit</span><span class="operator">*</span><span class="operator">></span>(<span class="string">"inputTextEdit"</span>)<span class="operator">-</span><span class="operator">></span>setPlainText(inputDocument);
}
<span class="type">void</span> QueryMainWindow<span class="operator">::</span>evaluate(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>str)
{
<span class="type">QFile</span> sourceDocument;
sourceDocument<span class="operator">.</span>setFileName(<span class="string">":/files/cookbook.xml"</span>);
sourceDocument<span class="operator">.</span>open(<span class="type">QIODevice</span><span class="operator">::</span>ReadOnly);
<span class="type">QByteArray</span> outArray;
<span class="type">QBuffer</span> buffer(<span class="operator">&</span>outArray);
buffer<span class="operator">.</span>open(<span class="type">QIODevice</span><span class="operator">::</span>ReadWrite);
<span class="type"><a href="qxmlquery.html">QXmlQuery</a></span> query;
query<span class="operator">.</span>bindVariable(<span class="string">"inputDocument"</span><span class="operator">,</span> <span class="operator">&</span>sourceDocument);
query<span class="operator">.</span>setQuery(str);
<span class="keyword">if</span> (<span class="operator">!</span>query<span class="operator">.</span>isValid())
<span class="keyword">return</span>;
<span class="type"><a href="qxmlformatter.html">QXmlFormatter</a></span> formatter(query<span class="operator">,</span> <span class="operator">&</span>buffer);
<span class="keyword">if</span> (<span class="operator">!</span>query<span class="operator">.</span>evaluateTo(<span class="operator">&</span>formatter))
<span class="keyword">return</span>;
buffer<span class="operator">.</span>close();
findChild<span class="operator"><</span><span class="type">QTextEdit</span><span class="operator">*</span><span class="operator">></span>(<span class="string">"outputTextEdit"</span>)<span class="operator">-</span><span class="operator">></span>setPlainText(<span class="type">QString</span><span class="operator">::</span>fromUtf8(outArray<span class="operator">.</span>constData()));
}
</pre>
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<!-- @@@recipes/querymainwindow.cpp -->
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