mainwindow.cpp Example File

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  #include "mainwindow.h"
  #include "pieceslist.h"
  #include "puzzlewidget.h"

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

  MainWindow::MainWindow(QWidget *parent)
      : QMainWindow(parent)
  {
      setupMenus();
      setupWidgets();

      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::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->width(),
              puzzleWidget->height(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);

      piecesList->clear();

      for (int y = 0; y < 5; ++y) {
          for (int x = 0; x < 5; ++x) {
              int pieceSize = puzzleWidget->pieceSize();
              QPixmap pieceImage = puzzleImage.copy(x * pieceSize, y * pieceSize, pieceSize, pieceSize);
              piecesList->addPiece(pieceImage, QPoint(x, y));
          }
      }

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

      for (int i = 0; i < piecesList->count(); ++i) {
          if (int(2.0*qrand()/(RAND_MAX+1.0)) == 1) {
              QListWidgetItem *item = piecesList->takeItem(i);
              piecesList->insertItem(0, item);
          }
      }

      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 PiecesList(puzzleWidget->pieceSize(), this);

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

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