mainwindow.cpp Example File | Qt Widgets 5.12.9

- Qt 5.12
- Qt Widgets
- Item Views Puzzle Example
- mainwindow.cpp Example File
- Qt 5.12.9 Reference Documentation

# mainwindow.cpp Example File

itemviews/puzzle/mainwindow.cpp

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     #include "mainwindow.h"
     #include "piecesmodel.h"
     #include "puzzlewidget.h"

     #include <QtWidgets>
     #include <stdlib.h>

     MainWindow::MainWindow(QWidget *parent)
         : QMainWindow(parent)
     {
         setupMenus();
         setupWidgets();
         model = new PiecesModel(puzzleWidget->pieceSize(), this);
         piecesList->setModel(model);

         setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed));
         setWindowTitle(tr("Puzzle"));
     }

     void MainWindow::openImage()
     {
         const QString directory =
             QStandardPaths::standardLocations(QStandardPaths::PicturesLocation).value(0, QDir::homePath());
         QFileDialog dialog(this, tr("Open Image"), directory);
         dialog.setAcceptMode(QFileDialog::AcceptOpen);
         dialog.setFileMode(QFileDialog::ExistingFile);
         QStringList mimeTypeFilters;
         for (const QByteArray &mimeTypeName : QImageReader::supportedMimeTypes())
             mimeTypeFilters.append(mimeTypeName);
         mimeTypeFilters.sort();
         dialog.setMimeTypeFilters(mimeTypeFilters);
         dialog.selectMimeTypeFilter("image/jpeg");
         if (dialog.exec() == QDialog::Accepted)
             loadImage(dialog.selectedFiles().constFirst());
     }

     void MainWindow::loadImage(const QString &fileName)
     {
         QPixmap newImage;
         if (!newImage.load(fileName)) {
             QMessageBox::warning(this, tr("Open Image"),
                                  tr("The image file could not be loaded."),
                                  QMessageBox::Close);
             return;
         }
         puzzleImage = newImage;
         setupPuzzle();
     }

     void MainWindow::setCompleted()
     {
         QMessageBox::information(this, tr("Puzzle Completed"),
                                  tr("Congratulations! You have completed the puzzle!\n"
                                     "Click OK to start again."),
                                  QMessageBox::Ok);

         setupPuzzle();
     }

     void MainWindow::setupPuzzle()
     {
         int size = qMin(puzzleImage.width(), puzzleImage.height());
         puzzleImage = puzzleImage.copy((puzzleImage.width() - size) / 2,
             (puzzleImage.height() - size) / 2, size, size).scaled(puzzleWidget->imageSize(),
                 puzzleWidget->imageSize(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);

         model->addPieces(puzzleImage);
         puzzleWidget->clear();
     }

     void MainWindow::setupMenus()
     {
         QMenu *fileMenu = menuBar()->addMenu(tr("&File"));

         QAction *openAction = fileMenu->addAction(tr("&Open..."), this, &MainWindow::openImage);
         openAction->setShortcuts(QKeySequence::Open);

         QAction *exitAction = fileMenu->addAction(tr("E&xit"), qApp, &QCoreApplication::quit);
         exitAction->setShortcuts(QKeySequence::Quit);

         QMenu *gameMenu = menuBar()->addMenu(tr("&Game"));

         gameMenu->addAction(tr("&Restart"), this, &MainWindow::setupPuzzle);
     }

     void MainWindow::setupWidgets()
     {
         QFrame *frame = new QFrame;
         QHBoxLayout *frameLayout = new QHBoxLayout(frame);

         puzzleWidget = new PuzzleWidget(400);

         piecesList = new QListView;
         piecesList->setDragEnabled(true);
         piecesList->setViewMode(QListView::IconMode);
         piecesList->setIconSize(QSize(puzzleWidget->pieceSize() - 20, puzzleWidget->pieceSize() - 20));
         piecesList->setGridSize(QSize(puzzleWidget->pieceSize(), puzzleWidget->pieceSize()));
         piecesList->setSpacing(10);
         piecesList->setMovement(QListView::Snap);
         piecesList->setAcceptDrops(true);
         piecesList->setDropIndicatorShown(true);

         PiecesModel *model = new PiecesModel(puzzleWidget->pieceSize(), this);
         piecesList->setModel(model);

         connect(puzzleWidget, &PuzzleWidget::puzzleCompleted,
                 this, &MainWindow::setCompleted, Qt::QueuedConnection);

         frameLayout->addWidget(piecesList);
         frameLayout->addWidget(puzzleWidget);
         setCentralWidget(frame);
     }