window.cpp Example File

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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)
  {
      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);

      setWindowTitle(tr("Find Files"));
      const QRect screenGeometry = QApplication::desktop()->screenGeometry(this);
      resize(screenGeometry.width() / 2, screenGeometry.height() / 3);
  }

  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());
  }


  static void findRecursion(const QString &path, const QString &pattern, QStringList *result)
  {
      QDir currentDir(path);
      const QString prefix = path + QLatin1Char('/');
      foreach (const QString &match, currentDir.entryList(QStringList(pattern), QDir::Files | QDir::NoSymLinks))
          result->append(prefix + match);
      foreach (const QString &dir, currentDir.entryList(QDir::Dirs | QDir::NoSymLinks | QDir::NoDotAndDotDot))
          findRecursion(prefix + dir, pattern, result);
  }


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

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

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


      currentDir = QDir(path);
      QStringList files;
      findRecursion(path, fileName.isEmpty() ? QStringLiteral("*") : fileName, &files);
      if (!text.isEmpty())
          files = findFiles(files, text);
      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 &files)
  {
      for (int i = 0; i < files.size(); ++i) {
          const QString &fileName = files.at(i);
          const QString toolTip = QDir::toNativeSeparators(fileName);
          const QString relativePath = QDir::toNativeSeparators(currentDir.relativeFilePath(fileName));
          const qint64 size = QFileInfo(fileName).size();
          QTableWidgetItem *fileNameItem = new QTableWidgetItem(relativePath);
          fileNameItem->setData(absoluteFileNameRole, QVariant(fileName));
          fileNameItem->setToolTip(toolTip);
          fileNameItem->setFlags(fileNameItem->flags() ^ Qt::ItemIsEditable);
          QTableWidgetItem *sizeItem = new QTableWidgetItem(tr("%1 KB")
                                               .arg(int((size + 1023) / 1024)));
          sizeItem->setData(absoluteFileNameRole, QVariant(fileName));
          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, files.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
  }