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# findfiledialog.cpp Example File
help/simpletextviewer/findfiledialog.cpp

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     #include <QtCore/QDir>
     #include <QtGui/QLayout>
     #include <QtGui/QComboBox>
     #include <QtGui/QTreeWidget>
     #include <QtGui/QLayout>
     #include <QtGui/QFileDialog>
     #include <QtGui/QDialogButtonBox>
     #include <QtGui/QToolButton>
     #include <QtGui/QPushButton>
     #include <QtGui/QLabel>

     #include "findfiledialog.h"
     #include "assistant.h"
     #include "textedit.h"

     FindFileDialog::FindFileDialog(TextEdit *editor, Assistant *assistant)
         : QDialog(editor)
     {
         currentAssistant = 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()
     {
         currentAssistant->showDocumentation("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();

         currentEditor->setContents(path + fileName);
         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);
     }