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findfiledialog.cpp Example File
^{assistant/simpletextviewer/findfiledialog.cpp}

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 #include <QtGui>

 #include "findfiledialog.h"

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

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

     directoryComboBox->addItem(QDir::toNativeSeparators(QDir::currentPath()));
     fileNameComboBox->addItem("*");
     findFiles();

     setWindowTitle(tr("Find File"));
 }

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

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

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

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

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

         if (fileName.endsWith(".html"))
             currentEditor->setHtml(data);
         else
             currentEditor->setPlainText(data);
     }
     close();
 }

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

 void FindFileDialog::findFiles()
 {
     QRegExp filePattern(fileNameComboBox->currentText() + "*");
     filePattern.setPatternSyntax(QRegExp::Wildcard);

     QDir directory(directoryComboBox->currentText());

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

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

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

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

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

 void FindFileDialog::createButtons()
 {
     browseButton = new QToolButton;
     browseButton->setText(tr("..."));
     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->setEditable(true);
     fileNameComboBox->setSizePolicy(QSizePolicy::Expanding,
                                     QSizePolicy::Preferred);

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

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

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

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

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

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

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

     QVBoxLayout *mainLayout = new QVBoxLayout;
     mainLayout->addLayout(fileLayout);
     mainLayout->addLayout(directoryLayout);
     mainLayout->addWidget(foundFilesTree);
     mainLayout->addStretch();
     mainLayout->addWidget(buttonBox);
     setLayout(mainLayout);
 }