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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->setShortcuts(QKeySequence::Quit);
         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;
         }
     }