window.cpp Example File

dialogs/findfiles/window.cpp 
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 #include <QtWidgets>

 #include "window.h"

 enum { absoluteFileNameRole = Qt::UserRole + 1 };

 static inline QString fileNameOfItem(const QTableWidgetItem *item)
 {
     return item->data(absoluteFileNameRole).toString();
 }

 static inline void openFile(const QString &fileName)
 {
     QDesktopServices::openUrl(QUrl::fromLocalFile(fileName));
 }

 Window::Window(QWidget *parent)
     : QWidget(parent)
 {
     setWindowTitle(tr("Find Files"));
     QPushButton *browseButton = new QPushButton(tr("&Browse..."), this);
     connect(browseButton, &QAbstractButton::clicked, this, &Window::browse);
     findButton = new QPushButton(tr("&Find"), this);
     connect(findButton, &QAbstractButton::clicked, this, &Window::find);

     fileComboBox = createComboBox(tr("*"));
     connect(fileComboBox->lineEdit(), &QLineEdit::returnPressed,
             this, &Window::animateFindClick);
     textComboBox = createComboBox();
     connect(textComboBox->lineEdit(), &QLineEdit::returnPressed,
             this, &Window::animateFindClick);
     directoryComboBox = createComboBox(QDir::toNativeSeparators(QDir::currentPath()));
     connect(directoryComboBox->lineEdit(), &QLineEdit::returnPressed,
             this, &Window::animateFindClick);

     filesFoundLabel = new QLabel;

     createFilesTable();

     QGridLayout *mainLayout = new QGridLayout(this);
     mainLayout->addWidget(new QLabel(tr("Named:")), 0, 0);
     mainLayout->addWidget(fileComboBox, 0, 1, 1, 2);
     mainLayout->addWidget(new QLabel(tr("Containing text:")), 1, 0);
     mainLayout->addWidget(textComboBox, 1, 1, 1, 2);
     mainLayout->addWidget(new QLabel(tr("In directory:")), 2, 0);
     mainLayout->addWidget(directoryComboBox, 2, 1);
     mainLayout->addWidget(browseButton, 2, 2);
     mainLayout->addWidget(filesTable, 3, 0, 1, 3);
     mainLayout->addWidget(filesFoundLabel, 4, 0, 1, 2);
     mainLayout->addWidget(findButton, 4, 2);

     connect(new QShortcut(QKeySequence::Quit, this), &QShortcut::activated,
         qApp, &QApplication::quit);
 }

 void Window::browse()
 {
     QString directory =
         QDir::toNativeSeparators(QFileDialog::getExistingDirectory(this, tr("Find Files"), QDir::currentPath()));

     if (!directory.isEmpty()) {
         if (directoryComboBox->findText(directory) == -1)
             directoryComboBox->addItem(directory);
         directoryComboBox->setCurrentIndex(directoryComboBox->findText(directory));
     }
 }

 static void updateComboBox(QComboBox *comboBox)
 {
     if (comboBox->findText(comboBox->currentText()) == -1)
         comboBox->addItem(comboBox->currentText());
 }

 void Window::find()
 {
     filesTable->setRowCount(0);

     QString fileName = fileComboBox->currentText();
     QString text = textComboBox->currentText();
     QString path = QDir::cleanPath(directoryComboBox->currentText());
     currentDir = QDir(path);

     updateComboBox(fileComboBox);
     updateComboBox(textComboBox);
     updateComboBox(directoryComboBox);

     QStringList filter;
     if (!fileName.isEmpty())
         filter << fileName;
     QDirIterator it(path, filter, QDir::AllEntries | QDir::NoSymLinks | QDir::NoDotAndDotDot, QDirIterator::Subdirectories);
     QStringList files;
     while (it.hasNext())
         files << it.next();
     if (!text.isEmpty())
         files = findFiles(files, text);
     files.sort();
     showFiles(files);
 }

 void Window::animateFindClick()
 {
     findButton->animateClick();
 }

 QStringList Window::findFiles(const QStringList &files, const QString &text)
 {
     QProgressDialog progressDialog(this);
     progressDialog.setCancelButtonText(tr("&Cancel"));
     progressDialog.setRange(0, files.size());
     progressDialog.setWindowTitle(tr("Find Files"));

     QMimeDatabase mimeDatabase;
     QStringList foundFiles;

     for (int i = 0; i < files.size(); ++i) {
         progressDialog.setValue(i);
         progressDialog.setLabelText(tr("Searching file number %1 of %n...", 0, files.size()).arg(i));
         QCoreApplication::processEvents();

         if (progressDialog.wasCanceled())
             break;

         const QString fileName = files.at(i);
         const QMimeType mimeType = mimeDatabase.mimeTypeForFile(fileName);
         if (mimeType.isValid() && !mimeType.inherits(QStringLiteral("text/plain"))) {
             qWarning() << "Not searching binary file " << QDir::toNativeSeparators(fileName);
             continue;
         }
         QFile file(fileName);
         if (file.open(QIODevice::ReadOnly)) {
             QString line;
             QTextStream in(&file);
             while (!in.atEnd()) {
                 if (progressDialog.wasCanceled())
                     break;
                 line = in.readLine();
                 if (line.contains(text, Qt::CaseInsensitive)) {
                     foundFiles << files[i];
                     break;
                 }
             }
         }
     }
     return foundFiles;
 }

 void Window::showFiles(const QStringList &paths)
 {
     for (const QString &filePath : paths) {
         const QString toolTip = QDir::toNativeSeparators(filePath);
         const QString relativePath = QDir::toNativeSeparators(currentDir.relativeFilePath(filePath));
         const qint64 size = QFileInfo(filePath).size();
         QTableWidgetItem *fileNameItem = new QTableWidgetItem(relativePath);
         fileNameItem->setData(absoluteFileNameRole, QVariant(filePath));
         fileNameItem->setToolTip(toolTip);
         fileNameItem->setFlags(fileNameItem->flags() ^ Qt::ItemIsEditable);
         QTableWidgetItem *sizeItem = new QTableWidgetItem(QLocale().formattedDataSize(size));
         sizeItem->setData(absoluteFileNameRole, QVariant(filePath));
         sizeItem->setToolTip(toolTip);
         sizeItem->setTextAlignment(Qt::AlignRight | Qt::AlignVCenter);
         sizeItem->setFlags(sizeItem->flags() ^ Qt::ItemIsEditable);

         int row = filesTable->rowCount();
         filesTable->insertRow(row);
         filesTable->setItem(row, 0, fileNameItem);
         filesTable->setItem(row, 1, sizeItem);
     }
     filesFoundLabel->setText(tr("%n file(s) found (Double click on a file to open it)", 0, paths.size()));
     filesFoundLabel->setWordWrap(true);
 }

 QComboBox *Window::createComboBox(const QString &text)
 {
     QComboBox *comboBox = new QComboBox;
     comboBox->setEditable(true);
     comboBox->addItem(text);
     comboBox->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
     return comboBox;
 }

 void Window::createFilesTable()
 {
     filesTable = new QTableWidget(0, 2);
     filesTable->setSelectionBehavior(QAbstractItemView::SelectRows);

     QStringList labels;
     labels << tr("Filename") << tr("Size");
     filesTable->setHorizontalHeaderLabels(labels);
     filesTable->horizontalHeader()->setSectionResizeMode(0, QHeaderView::Stretch);
     filesTable->verticalHeader()->hide();
     filesTable->setShowGrid(false);
     filesTable->setContextMenuPolicy(Qt::CustomContextMenu);
     connect(filesTable, &QTableWidget::customContextMenuRequested,
             this, &Window::contextMenu);
     connect(filesTable, &QTableWidget::cellActivated,
             this, &Window::openFileOfItem);
 }


 void Window::openFileOfItem(int row, int /* column */)
 {
     const QTableWidgetItem *item = filesTable->item(row, 0);
     openFile(fileNameOfItem(item));
 }


 void Window::contextMenu(const QPoint &pos)
 {
     const QTableWidgetItem *item = filesTable->itemAt(pos);
     if (!item)
         return;
     QMenu menu;
 #ifndef QT_NO_CLIPBOARD
     QAction *copyAction = menu.addAction("Copy Name");
 #endif
     QAction *openAction = menu.addAction("Open");
     QAction *action = menu.exec(filesTable->mapToGlobal(pos));
     if (!action)
         return;
     const QString fileName = fileNameOfItem(item);
     if (action == openAction)
         openFile(fileName);
 #ifndef QT_NO_CLIPBOARD
     else if (action == copyAction)
         QGuiApplication::clipboard()->setText(QDir::toNativeSeparators(fileName));
 #endif
 }

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