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

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        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be distributed under the terms of the Q Public License
    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
    **
    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.
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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, QMessageBox::NoButton);
                    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));
                }
            }

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

            for (int i = 0; i < piecesList->count(); ++i) {
                if (int(2.0*rand()/(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);
        }