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mainwindow.cpp Example File
^{widgets/icons/mainwindow.cpp}

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 #include <QtGui>

 #include "iconpreviewarea.h"
 #include "iconsizespinbox.h"
 #include "imagedelegate.h"
 #include "mainwindow.h"

 MainWindow::MainWindow()
 {
     centralWidget = new QWidget;
     setCentralWidget(centralWidget);

     createPreviewGroupBox();
     createImagesGroupBox();
     createIconSizeGroupBox();

     createActions();
     createMenus();
     createContextMenu();

     QGridLayout *mainLayout = new QGridLayout;
     mainLayout->addWidget(previewGroupBox, 0, 0, 1, 2);
     mainLayout->addWidget(imagesGroupBox, 1, 0);
     mainLayout->addWidget(iconSizeGroupBox, 1, 1);
     centralWidget->setLayout(mainLayout);

     setWindowTitle(tr("Icons"));
     checkCurrentStyle();
     otherRadioButton->click();

     resize(minimumSizeHint());
 }

 void MainWindow::about()
 {
     QMessageBox::about(this, tr("About Icons"),
             tr("The <b>Icons</b> example illustrates how Qt renders an icon in "
                "different modes (active, normal, disabled, and selected) and "
                "states (on and off) based on a set of images."));
 }

 void MainWindow::changeStyle(bool checked)
 {
     if (!checked)
         return;

     QAction *action = qobject_cast<QAction *>(sender());
     QStyle *style = QStyleFactory::create(action->data().toString());
     Q_ASSERT(style);
     QApplication::setStyle(style);

     smallRadioButton->setText(tr("Small (%1 x %1)")
             .arg(style->pixelMetric(QStyle::PM_SmallIconSize)));
     largeRadioButton->setText(tr("Large (%1 x %1)")
             .arg(style->pixelMetric(QStyle::PM_LargeIconSize)));
     toolBarRadioButton->setText(tr("Toolbars (%1 x %1)")
             .arg(style->pixelMetric(QStyle::PM_ToolBarIconSize)));
     listViewRadioButton->setText(tr("List views (%1 x %1)")
             .arg(style->pixelMetric(QStyle::PM_ListViewIconSize)));
     iconViewRadioButton->setText(tr("Icon views (%1 x %1)")
             .arg(style->pixelMetric(QStyle::PM_IconViewIconSize)));
     tabBarRadioButton->setText(tr("Tab bars (%1 x %1)")
             .arg(style->pixelMetric(QStyle::PM_TabBarIconSize)));

     changeSize();
 }

 void MainWindow::changeSize(bool checked)
 {
     if (!checked)
         return;

     int extent;

     if (otherRadioButton->isChecked()) {
         extent = otherSpinBox->value();
     } else {
         QStyle::PixelMetric metric;

         if (smallRadioButton->isChecked()) {
             metric = QStyle::PM_SmallIconSize;
         } else if (largeRadioButton->isChecked()) {
             metric = QStyle::PM_LargeIconSize;
         } else if (toolBarRadioButton->isChecked()) {
             metric = QStyle::PM_ToolBarIconSize;
         } else if (listViewRadioButton->isChecked()) {
             metric = QStyle::PM_ListViewIconSize;
         } else if (iconViewRadioButton->isChecked()) {
             metric = QStyle::PM_IconViewIconSize;
         } else {
             metric = QStyle::PM_TabBarIconSize;
         }
         extent = QApplication::style()->pixelMetric(metric);
     }
     previewArea->setSize(QSize(extent, extent));
     otherSpinBox->setEnabled(otherRadioButton->isChecked());
 }

 void MainWindow::changeIcon()
 {
     QIcon icon;

     for (int row = 0; row < imagesTable->rowCount(); ++row) {
         QTableWidgetItem *item0 = imagesTable->item(row, 0);
         QTableWidgetItem *item1 = imagesTable->item(row, 1);
         QTableWidgetItem *item2 = imagesTable->item(row, 2);

         if (item0->checkState() == Qt::Checked) {
             QIcon::Mode mode;
             if (item1->text() == tr("Normal")) {
                 mode = QIcon::Normal;
             } else if (item1->text() == tr("Active")) {
                 mode = QIcon::Active;
             } else if (item1->text() == tr("Disabled")) {
                 mode = QIcon::Disabled;
             } else {
                 mode = QIcon::Selected;
             }

             QIcon::State state;
             if (item2->text() == tr("On")) {
                 state = QIcon::On;
             } else {
                 state = QIcon::Off;
             }

             QString fileName = item0->data(Qt::UserRole).toString();
             QImage image(fileName);
             if (!image.isNull())
                 icon.addPixmap(QPixmap::fromImage(image), mode, state);
         }
     }

     previewArea->setIcon(icon);
 }

 void MainWindow::addImages()
 {
     QStringList fileNames = QFileDialog::getOpenFileNames(this,
                                     tr("Open Images"), "",
                                     tr("Images (*.png *.xpm *.jpg);;"
                                        "All Files (*)"));
     if (!fileNames.isEmpty()) {
         foreach (QString fileName, fileNames) {
             int row = imagesTable->rowCount();
             imagesTable->setRowCount(row + 1);

             QString imageName = QFileInfo(fileName).baseName();
             QTableWidgetItem *item0 = new QTableWidgetItem(imageName);
             item0->setData(Qt::UserRole, fileName);
             item0->setFlags(item0->flags() & ~Qt::ItemIsEditable);

             QTableWidgetItem *item1 = new QTableWidgetItem(tr("Normal"));
             QTableWidgetItem *item2 = new QTableWidgetItem(tr("Off"));

             if (guessModeStateAct->isChecked()) {
                 if (fileName.contains("_act")) {
                     item1->setText(tr("Active"));
                 } else if (fileName.contains("_dis")) {
                     item1->setText(tr("Disabled"));
                 } else if (fileName.contains("_sel")) {
                     item1->setText(tr("Selected"));
                 }

                 if (fileName.contains("_on"))
                     item2->setText(tr("On"));
             }

             imagesTable->setItem(row, 0, item0);
             imagesTable->setItem(row, 1, item1);
             imagesTable->setItem(row, 2, item2);
             imagesTable->openPersistentEditor(item1);
             imagesTable->openPersistentEditor(item2);

             item0->setCheckState(Qt::Checked);
         }
     }
 }

 void MainWindow::removeAllImages()
 {
     imagesTable->setRowCount(0);
     changeIcon();
 }

 void MainWindow::createPreviewGroupBox()
 {
     previewGroupBox = new QGroupBox(tr("Preview"));

     previewArea = new IconPreviewArea;

     QVBoxLayout *layout = new QVBoxLayout;
     layout->addWidget(previewArea);
     previewGroupBox->setLayout(layout);
 }

 void MainWindow::createImagesGroupBox()
 {
     imagesGroupBox = new QGroupBox(tr("Images"));

     imagesTable = new QTableWidget;
     imagesTable->setSelectionMode(QAbstractItemView::NoSelection);
     imagesTable->setItemDelegate(new ImageDelegate(this));

     QStringList labels;
     labels << tr("Image") << tr("Mode") << tr("State");

     imagesTable->horizontalHeader()->setDefaultSectionSize(90);
     imagesTable->setColumnCount(3);
     imagesTable->setHorizontalHeaderLabels(labels);
     imagesTable->horizontalHeader()->setResizeMode(0, QHeaderView::Stretch);
     imagesTable->horizontalHeader()->setResizeMode(1, QHeaderView::Fixed);
     imagesTable->horizontalHeader()->setResizeMode(2, QHeaderView::Fixed);
     imagesTable->verticalHeader()->hide();

     connect(imagesTable, SIGNAL(itemChanged(QTableWidgetItem *)),
             this, SLOT(changeIcon()));

     QVBoxLayout *layout = new QVBoxLayout;
     layout->addWidget(imagesTable);
     imagesGroupBox->setLayout(layout);
 }

 void MainWindow::createIconSizeGroupBox()
 {
     iconSizeGroupBox = new QGroupBox(tr("Icon Size"));

     smallRadioButton = new QRadioButton;
     largeRadioButton = new QRadioButton;
     toolBarRadioButton = new QRadioButton;
     listViewRadioButton = new QRadioButton;
     iconViewRadioButton = new QRadioButton;
     tabBarRadioButton = new QRadioButton;
     otherRadioButton = new QRadioButton(tr("Other:"));

     otherSpinBox = new IconSizeSpinBox;
     otherSpinBox->setRange(8, 128);
     otherSpinBox->setValue(64);

     connect(smallRadioButton, SIGNAL(toggled(bool)),
             this, SLOT(changeSize(bool)));
     connect(largeRadioButton, SIGNAL(toggled(bool)),
             this, SLOT(changeSize(bool)));
     connect(toolBarRadioButton, SIGNAL(toggled(bool)),
             this, SLOT(changeSize(bool)));
     connect(listViewRadioButton, SIGNAL(toggled(bool)),
             this, SLOT(changeSize(bool)));
     connect(iconViewRadioButton, SIGNAL(toggled(bool)),
             this, SLOT(changeSize(bool)));
     connect(tabBarRadioButton, SIGNAL(toggled(bool)),
             this, SLOT(changeSize(bool)));
     connect(otherRadioButton, SIGNAL(toggled(bool)),
             this, SLOT(changeSize(bool)));
     connect(otherSpinBox, SIGNAL(valueChanged(int)), this, SLOT(changeSize()));

     QHBoxLayout *otherSizeLayout = new QHBoxLayout;
     otherSizeLayout->addWidget(otherRadioButton);
     otherSizeLayout->addWidget(otherSpinBox);
     otherSizeLayout->addStretch();

     QGridLayout *layout = new QGridLayout;
     layout->addWidget(smallRadioButton, 0, 0);
     layout->addWidget(largeRadioButton, 1, 0);
     layout->addWidget(toolBarRadioButton, 2, 0);
     layout->addWidget(listViewRadioButton, 0, 1);
     layout->addWidget(iconViewRadioButton, 1, 1);
     layout->addWidget(tabBarRadioButton, 2, 1);
     layout->addLayout(otherSizeLayout, 3, 0, 1, 2);
     layout->setRowStretch(4, 1);
     iconSizeGroupBox->setLayout(layout);
 }

 void MainWindow::createActions()
 {
     addImagesAct = new QAction(tr("&Add Images..."), this);
     addImagesAct->setShortcut(tr("Ctrl+A"));
     connect(addImagesAct, SIGNAL(triggered()), this, SLOT(addImages()));

     removeAllImagesAct = new QAction(tr("&Remove All Images"), this);
     removeAllImagesAct->setShortcut(tr("Ctrl+R"));
     connect(removeAllImagesAct, SIGNAL(triggered()),
             this, SLOT(removeAllImages()));

     exitAct = new QAction(tr("&Quit"), this);
     exitAct->setShortcut(tr("Ctrl+Q"));
     connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

     styleActionGroup = new QActionGroup(this);
     foreach (QString styleName, QStyleFactory::keys()) {
         QAction *action = new QAction(styleActionGroup);
         action->setText(tr("%1 Style").arg(styleName));
         action->setData(styleName);
         action->setCheckable(true);
         connect(action, SIGNAL(triggered(bool)), this, SLOT(changeStyle(bool)));
     }

     guessModeStateAct = new QAction(tr("&Guess Image Mode/State"), this);
     guessModeStateAct->setCheckable(true);
     guessModeStateAct->setChecked(true);

     aboutAct = new QAction(tr("&About"), this);
     connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

     aboutQtAct = new QAction(tr("About &Qt"), this);
     connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
 }

 void MainWindow::createMenus()
 {
     fileMenu = menuBar()->addMenu(tr("&File"));
     fileMenu->addAction(addImagesAct);
     fileMenu->addAction(removeAllImagesAct);
     fileMenu->addSeparator();
     fileMenu->addAction(exitAct);

     viewMenu = menuBar()->addMenu(tr("&View"));
     foreach (QAction *action, styleActionGroup->actions())
         viewMenu->addAction(action);
     viewMenu->addSeparator();
     viewMenu->addAction(guessModeStateAct);

     menuBar()->addSeparator();

     helpMenu = menuBar()->addMenu(tr("&Help"));
     helpMenu->addAction(aboutAct);
     helpMenu->addAction(aboutQtAct);
 }

 void MainWindow::createContextMenu()
 {
     imagesTable->setContextMenuPolicy(Qt::ActionsContextMenu);
     imagesTable->addAction(addImagesAct);
     imagesTable->addAction(removeAllImagesAct);
 }

 void MainWindow::checkCurrentStyle()
 {
     foreach (QAction *action, styleActionGroup->actions()) {
         QString styleName = action->data().toString();
         QStyle *candidate = QStyleFactory::create(styleName);
         Q_ASSERT(candidate);
         if (candidate->metaObject()->className()
                 == QApplication::style()->metaObject()->className()) {
             action->trigger();
             return;
         }
         delete candidate;
     }
 }