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 #include &lt;QtGui&gt;

 #include &quot;findfiledialog.h&quot;

 FindFileDialog::FindFileDialog(QTextEdit *editor, QAssistantClient *assistant,
                                QWidget *parent)
     : QDialog(parent)
 {
     currentAssistantClient = assistant;
     currentEditor = editor;

     createButtons();
     createComboBoxes();
     createFilesTree();
     createLabels();
     createLayout();

     directoryComboBox-&gt;addItem(QDir::toNativeSeparators(QDir::currentPath()));
     fileNameComboBox-&gt;addItem(&quot;*&quot;);
     findFiles();

     setWindowTitle(tr(&quot;Find File&quot;));
 }

 void FindFileDialog::browse()
 {
     QString currentDirectory = directoryComboBox-&gt;currentText();
     QString newDirectory = QFileDialog::getExistingDirectory(this,
                                tr(&quot;Select Directory&quot;), currentDirectory);
     if (!newDirectory.isEmpty()) {
         directoryComboBox-&gt;addItem(QDir::toNativeSeparators(newDirectory));
         directoryComboBox-&gt;setCurrentIndex(directoryComboBox-&gt;count() - 1);
         update();
     }
 }

 void FindFileDialog::help()
 {
     currentAssistantClient-&gt;showPage(QLibraryInfo::location(QLibraryInfo::ExamplesPath) +
             QDir::separator() +  &quot;assistant/simpletextviewer/documentation/filedialog.html&quot;);
 }

 void FindFileDialog::openFile(QTreeWidgetItem *item)
 {
     if (!item) {
         item = foundFilesTree-&gt;currentItem();
         if (!item)
             return;
     }

     QString fileName = item-&gt;text(0);
     QString path = directoryComboBox-&gt;currentText() + QDir::separator();

     QFile file(path + fileName);
     if (file.open(QIODevice::ReadOnly)) {
         QString data(file.readAll());

         if (fileName.endsWith(&quot;.html&quot;))
             currentEditor-&gt;setHtml(data);
         else
             currentEditor-&gt;setPlainText(data);
     }
     close();
 }

 void FindFileDialog::update()
 {
     findFiles();
     buttonBox-&gt;button(QDialogButtonBox::Open)-&gt;setEnabled(
             foundFilesTree-&gt;topLevelItemCount() &gt; 0);
 }

 void FindFileDialog::findFiles()
 {
     QRegExp filePattern(fileNameComboBox-&gt;currentText() + &quot;*&quot;);
     filePattern.setPatternSyntax(QRegExp::Wildcard);

     QDir directory(directoryComboBox-&gt;currentText());

     QStringList allFiles = directory.entryList(QDir::Files | QDir::NoSymLinks);
     QStringList matchingFiles;

     foreach (QString file, allFiles) {
         if (filePattern.exactMatch(file))
             matchingFiles &lt;&lt; file;
     }
     showFiles(matchingFiles);
 }

 void FindFileDialog::showFiles(const QStringList &amp;files)
 {
     foundFilesTree-&gt;clear();

     for (int i = 0; i &lt; files.count(); ++i) {
         QTreeWidgetItem *item = new QTreeWidgetItem(foundFilesTree);
         item-&gt;setText(0, files[i]);
     }

     if (files.count() &gt; 0)
         foundFilesTree-&gt;setCurrentItem(foundFilesTree-&gt;topLevelItem(0));
 }

 void FindFileDialog::createButtons()
 {
     browseButton = new QToolButton;
     browseButton-&gt;setText(tr(&quot;...&quot;));
     connect(browseButton, SIGNAL(clicked()), this, SLOT(browse()));

     buttonBox = new QDialogButtonBox(QDialogButtonBox::Open
                                      | QDialogButtonBox::Cancel
                                      | QDialogButtonBox::Help);
     connect(buttonBox, SIGNAL(accepted()), this, SLOT(openFile()));
     connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));
     connect(buttonBox, SIGNAL(helpRequested()), this, SLOT(help()));
 }

 void FindFileDialog::createComboBoxes()
 {
     directoryComboBox = new QComboBox;
     fileNameComboBox = new QComboBox;

     fileNameComboBox-&gt;setEditable(true);
     fileNameComboBox-&gt;setSizePolicy(QSizePolicy::Expanding,
                                     QSizePolicy::Preferred);

     directoryComboBox-&gt;setMinimumContentsLength(30);
     directoryComboBox-&gt;setSizeAdjustPolicy(
             QComboBox::AdjustToMinimumContentsLength);
     directoryComboBox-&gt;setSizePolicy(QSizePolicy::Expanding,
                                      QSizePolicy::Preferred);

     connect(fileNameComboBox, SIGNAL(editTextChanged(const QString &amp;)),
             this, SLOT(update()));
     connect(directoryComboBox, SIGNAL(currentIndexChanged(const QString &amp;)),
             this, SLOT(update()));
 }

 void FindFileDialog::createFilesTree()
 {
     foundFilesTree = new QTreeWidget;
     foundFilesTree-&gt;setColumnCount(1);
     foundFilesTree-&gt;setHeaderLabels(QStringList(tr(&quot;Matching Files&quot;)));
     foundFilesTree-&gt;setRootIsDecorated(false);
     foundFilesTree-&gt;setSelectionMode(QAbstractItemView::SingleSelection);

     connect(foundFilesTree, SIGNAL(itemActivated(QTreeWidgetItem *, int)),
             this, SLOT(openFile(QTreeWidgetItem *)));
 }

 void FindFileDialog::createLabels()
 {
     directoryLabel = new QLabel(tr(&quot;Search in:&quot;));
     fileNameLabel = new QLabel(tr(&quot;File name (including wildcards):&quot;));
 }

 void FindFileDialog::createLayout()
 {
     QHBoxLayout *fileLayout = new QHBoxLayout;
     fileLayout-&gt;addWidget(fileNameLabel);
     fileLayout-&gt;addWidget(fileNameComboBox);

     QHBoxLayout *directoryLayout = new QHBoxLayout;
     directoryLayout-&gt;addWidget(directoryLabel);
     directoryLayout-&gt;addWidget(directoryComboBox);
     directoryLayout-&gt;addWidget(browseButton);

     QVBoxLayout *mainLayout = new QVBoxLayout;
     mainLayout-&gt;addLayout(fileLayout);
     mainLayout-&gt;addLayout(directoryLayout);
     mainLayout-&gt;addWidget(foundFilesTree);
     mainLayout-&gt;addStretch();
     mainLayout-&gt;addWidget(buttonBox);
     setLayout(mainLayout);
 }</pre>
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