Qt 4.0: window.cpp Example File (dialogs/findfiles/window.cpp)

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# window.cpp Example File
dialogs/findfiles/window.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
    ** General Public Licensing requirements will be met:
    ** http://www.trolltech.com/products/qt/opensource.html
    **
    ** If you are unsure which license is appropriate for your use, please
    ** review the following information:
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        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        **
        ****************************************************************************/

        #include <QtGui>

        #include "window.h"

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

            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();

            QHBoxLayout *buttonsLayout = new QHBoxLayout;
            buttonsLayout->addStretch();
            buttonsLayout->addWidget(findButton);
            buttonsLayout->addWidget(quitButton);

            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);
            mainLayout->addLayout(buttonsLayout, 5, 0, 1, 3);
            setLayout(mainLayout);

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

        void Window::browse()
        {
            QString directory = QFileDialog::getExistingDirectory(this,
                                       tr("Find Files"), QDir::currentPath());
            directoryComboBox->addItem(directory);
            directoryComboBox->setCurrentIndex(directoryComboBox->currentIndex() + 1);
        }

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

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

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

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

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

            QStringList foundFiles;

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

                if (progressDialog.wasCanceled())
                    break;

                QFile file(directory.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 QDir &directory, const QStringList &files)
        {
            for (int i = 0; i < files.count(); ++i) {
                QFile file(directory.absoluteFilePath(files[i]));
                qint64 size = QFileInfo(file).size();

                QTableWidgetItem *fileNameItem = new QTableWidgetItem(files[i]);
                fileNameItem->setFlags(Qt::ItemIsEnabled);
                QTableWidgetItem *sizeItem = new QTableWidgetItem(QString("%1 KB")
                                                     .arg(int((size + 1023) / 1024)));
                sizeItem->setTextAlignment(Qt::AlignVCenter | Qt::AlignRight);
                sizeItem->setFlags(Qt::ItemIsEnabled);

                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.count()));
        }

        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);
            QStringList labels;
            labels << tr("File Name") << tr("Size");
            filesTable->setHorizontalHeaderLabels(labels);
            filesTable->horizontalHeader()->setResizeMode(0, QHeaderView::Stretch);
            filesTable->verticalHeader()->hide();
            filesTable->setShowGrid(false);
        }