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# mainwindow.cpp Example File
widgets/icons/mainwindow.cpp

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        ** This file is part of the documentation of the Qt Toolkit.
        **
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    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
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    ** packaging of this file.
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    **   information about Qt Commercial License Agreements.
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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(imagesGroupBox, 0, 0);
            mainLayout->addWidget(iconSizeGroupBox, 1, 0);
            mainLayout->addWidget(previewGroupBox, 0, 1, 2, 1);
            centralWidget->setLayout(mainLayout);

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

            resize(860, 400);
        }

        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, and disabled) 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 × %1)")
                    .arg(style->pixelMetric(QStyle::PM_SmallIconSize)));
            largeRadioButton->setText(tr("Large (%1 × %1)")
                    .arg(style->pixelMetric(QStyle::PM_LargeIconSize)));
            toolBarRadioButton->setText(tr("Toolbars (%1 × %1)")
                    .arg(style->pixelMetric(QStyle::PM_ToolBarIconSize)));
            listViewRadioButton->setText(tr("List views (%1 × %1)")
                    .arg(style->pixelMetric(QStyle::PM_ListViewIconSize)));
            iconViewRadioButton->setText(tr("Icon views (%1 × %1)")
                    .arg(style->pixelMetric(QStyle::PM_IconViewIconSize)));

            changeSize();
        }

        void MainWindow::changeSize()
        {
            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 {
                    metric = QStyle::PM_IconViewIconSize;
                }
                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 {
                        mode = QIcon::Disabled;
                    }

                    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::addImage()
        {
            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"));
                        }

                        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"));
            imagesGroupBox->setSizePolicy(QSizePolicy::Expanding,
                                          QSizePolicy::Expanding);

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

            imagesTable = new QTableWidget;
            imagesTable->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Ignored);
            imagesTable->setSelectionMode(QAbstractItemView::NoSelection);
            imagesTable->setColumnCount(3);
            imagesTable->setHorizontalHeaderLabels(labels);
            imagesTable->setItemDelegate(new ImageDelegate(this));

            imagesTable->horizontalHeader()->resizeSection(0, 160);
            imagesTable->horizontalHeader()->resizeSection(1, 80);
            imagesTable->horizontalHeader()->resizeSection(2, 80);
            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;
            otherRadioButton = new QRadioButton(tr("Other:"));

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

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

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

            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->addLayout(otherSizeLayout, 2, 1);
            iconSizeGroupBox->setLayout(layout);
        }

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

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

            exitAct = new QAction(tr("&Exit"), 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(addImageAct);
            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(addImageAct);
            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;
            }
        }