- Qt 5.5
- Qt Widgets
- Find Files Example
- window.cpp Example File
- Qt 5.5.1 Reference Documentation

# window.cpp Example File

dialogs/findfiles/window.cpp

    /****************************************************************************
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    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    #include <QtWidgets>

    #include "window.h"

    Window::Window(QWidget *parent)
        : QWidget(parent)
    {
        browseButton = createButton(tr("&Browse..."), SLOT(browse()));
        findButton = createButton(tr("&Find"), SLOT(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);
    }

    QPushButton *Window::createButton(const QString &text, const char *member)
    {
        QPushButton *button = new QPushButton(text);
        connect(button, SIGNAL(clicked()), this, member);
        return button;
    }

    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, SIGNAL(cellActivated(int,int)),
                this, SLOT(openFileOfItem(int,int)));
    }

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

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