mainwindow.cpp Example File

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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 fileName =
          QFileDialog::getOpenFileName(this,
                                       tr("Open Image"), QString(),
                                       tr("Image Files (*.png *.jpg *.bmp)"));
      if (!fileName.isEmpty())
          loadImage(fileName);
  }

  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::Cancel);
          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);

      qsrand(QCursor::pos().x() ^ QCursor::pos().y());

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

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

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

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

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

      QAction *restartAction = gameMenu->addAction(tr("&Restart"));

      connect(openAction, &QAction::triggered, this, &MainWindow::openImage);
      connect(exitAction, &QAction::triggered, qApp, &QCoreApplication::quit);
      connect(restartAction, &QAction::triggered, 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);
  }