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# mainwindow.cpp Example File
draganddrop/puzzle/mainwindow.cpp

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     #include <QtGui>
     #include <stdlib.h>

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

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

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

     void MainWindow::openImage(const QString &path)
     {
         QString fileName = path;

         if (fileName.isNull())
             fileName = QFileDialog::getOpenFileName(this,
                 tr("Open Image"), "", "Image Files (*.png *.jpg *.bmp)");

         if (!fileName.isEmpty()) {
             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(400,
                 400, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);

         piecesList->clear();

         for (int y = 0; y < 5; ++y) {
             for (int x = 0; x < 5; ++x) {
                 QPixmap pieceImage = puzzleImage.copy(x*80, y*80, 80, 80);
                 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..."));
         openAction->setShortcut(QKeySequence(tr("Ctrl+O")));

         QAction *exitAction = fileMenu->addAction(tr("E&xit"));
         exitAction->setShortcut(QKeySequence(tr("Ctrl+Q")));

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

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

         connect(openAction, SIGNAL(triggered()), this, SLOT(openImage()));
         connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
         connect(restartAction, SIGNAL(triggered()), this, SLOT(setupPuzzle()));
     }

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

         piecesList = new PiecesList;
         puzzleWidget = new PuzzleWidget;

         connect(puzzleWidget, SIGNAL(puzzleCompleted()),
                 this, SLOT(setCompleted()), Qt::QueuedConnection);

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