window.cpp Example File | Qt Widgets 5.12.11

- Qt 5.12
- Qt Widgets
- Find Files Example
- window.cpp Example File
- Qt 5.12.11 Reference Documentation

# 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
     }