Qt Reference Documentation

- Qt 4.8
- ALL VERSIONS

- A
- A
- A
- Print

# window.cpp Example File

dialogs/findfiles/window.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #include <QtGui>

     #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->setSizeConstraint(QLayout::SetNoConstraint);
         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"));
     #if !defined(Q_OS_SYMBIAN) && !defined(Q_WS_MAEMO_5) && !defined(Q_WS_SIMULATOR)
         resize(700, 300);
     #endif
     }

     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()) +
     #if defined(Q_OS_SYMBIAN) || defined(Q_WS_MAEMO_5)
                                  (" (Select file to open it)"));
     #else
                                  (" (Double click on a file to open it)"));
     #endif
         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);
     #if defined(Q_OS_SYMBIAN) || defined(Q_WS_MAEMO_5) || defined(Q_WS_SIMULATOR)
         comboBox->setMinimumContentsLength(3);
     #endif
         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()->setResizeMode(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())));
     }