Qt 4.3: window.cpp Example File (dialogs/findfiles/window.cpp)

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

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     #include <QtGui>

     #include "window.h"

     Window::Window(QWidget *parent)
         : QDialog(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();

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

         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());
         if (!directory.isEmpty()) {
             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.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(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.size(); ++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(tr("%1 KB")
                                                  .arg(int((size + 1023) / 1024)));
             sizeItem->setTextAlignment(Qt::AlignRight | Qt::AlignVCenter);
             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.size()));
     }

     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);
     }