Qt 5.6 | Qt Widgets | Drag and Drop Puzzle Example | mainwindow.cpp Example File

Qt 5.6.2 Reference Documentation

# mainwindow.cpp Example File

draganddrop/puzzle/mainwindow.cpp

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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);
      }