window.cpp Example File

dialogs/findfiles/window.cpp

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  #include <QtWidgets>

  #include "window.h"

  Window::Window(QWidget *parent)
      : QWidget(parent)
  {
      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("*"));
      textComboBox = createComboBox();
      directoryComboBox = createComboBox(QDir::currentPath());

      fileLabel = new QLabel(tr("Named:"));
      textLabel = new QLabel(tr("Containing text:"));
      directoryLabel = new QLabel(tr("In directory:"));
      filesFoundLabel = new QLabel;

      createFilesTable();

      QGridLayout *mainLayout = new QGridLayout;
      mainLayout->addWidget(fileLabel, 0, 0);
      mainLayout->addWidget(fileComboBox, 0, 1, 1, 2);
      mainLayout->addWidget(textLabel, 1, 0);
      mainLayout->addWidget(textComboBox, 1, 1, 1, 2);
      mainLayout->addWidget(directoryLabel, 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);
      setLayout(mainLayout);

      setWindowTitle(tr("Find Files"));
      resize(700, 300);
  }

  void Window::browse()
  {
      QString directory = 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 = directoryComboBox->currentText();

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

      currentDir = QDir(path);
      QStringList files;
      if (fileName.isEmpty())
          fileName = "*";
      files = currentDir.entryList(QStringList(fileName),
                                   QDir::Files | QDir::NoSymLinks);

      if (!text.isEmpty())
          files = findFiles(files, text);
      showFiles(files);
  }

  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"));

      QStringList foundFiles;

      for (int i = 0; i < files.size(); ++i) {
          progressDialog.setValue(i);
          progressDialog.setLabelText(tr("Searching file number %1 of %2...")
                                      .arg(i).arg(files.size()));
          qApp->processEvents();

          if (progressDialog.wasCanceled())
              break;

          QFile file(currentDir.absoluteFilePath(files[i]));

          if (file.open(QIODevice::ReadOnly)) {
              QString line;
              QTextStream in(&file);
              while (!in.atEnd()) {
                  if (progressDialog.wasCanceled())
                      break;
                  line = in.readLine();
                  if (line.contains(text)) {
                      foundFiles << files[i];
                      break;
                  }
              }
          }
      }
      return foundFiles;
  }

  void Window::showFiles(const QStringList &files)
  {
      for (int i = 0; i < files.size(); ++i) {
          QFile file(currentDir.absoluteFilePath(files[i]));
          qint64 size = QFileInfo(file).size();

          QTableWidgetItem *fileNameItem = new QTableWidgetItem(files[i]);
          fileNameItem->setFlags(fileNameItem->flags() ^ Qt::ItemIsEditable);
          QTableWidgetItem *sizeItem = new QTableWidgetItem(tr("%1 KB")
                                               .arg(int((size + 1023) / 1024)));
          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("%1 file(s) found").arg(files.size()) +
                               (" (Double click on a file to open it)"));
      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);

      connect(filesTable, &QTableWidget::cellActivated,
              this, &Window::openFileOfItem);
  }


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

      QDesktopServices::openUrl(QUrl::fromLocalFile(currentDir.absoluteFilePath(item->text())));
  }