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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">mainwindow.cpp Example File<br /><small><small>draganddrop/puzzle/mainwindow.cpp</small></small></h1>

<pre>  /****************************************************************************

** This file is part of the documentation of the Qt Toolkit.

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** 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

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** not clear to you.

** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE

** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

****************************************************************************/

#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,

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(puzzleImage.height() - size)/2, size, size).scaled(400,

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400, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);

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piecesList->clear();

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for (int y = 0; y < 5; ++y) {

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for (int x = 0; x < 5; ++x) {

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QPixmap pieceImage = puzzleImage.copy(x*80, y*80, 80, 80);

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piecesList->addPiece(pieceImage, QPoint(x, y));

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}

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}

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

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for (int i = 0; i < piecesList->count(); ++i) {

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if (int(2.0*rand()/(RAND_MAX+1.0)) == 1) {

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QListWidgetItem *item = piecesList->takeItem(i);

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piecesList->insertItem(0, item);

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}

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}

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puzzleWidget->clear();

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}

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void MainWindow::setupMenus()

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{

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QMenu *fileMenu = menuBar()->addMenu(tr("&File"));

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

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openAction->setShortcut(QKeySequence(tr("Ctrl+O")));

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

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exitAction->setShortcut(QKeySequence(tr("Ctrl+Q")));

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

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

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connect(openAction, SIGNAL(triggered()), this, SLOT(openImage()));

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connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

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connect(restartAction, SIGNAL(triggered()), this, SLOT(setupPuzzle()));

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}

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void MainWindow::setupWidgets()

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{

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QFrame *frame = new QFrame;

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QHBoxLayout *frameLayout = new QHBoxLayout(frame);

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piecesList = new PiecesList;

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puzzleWidget = new PuzzleWidget;

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connect(puzzleWidget, SIGNAL(puzzleCompleted()),

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this, SLOT(setCompleted()), Qt::QueuedConnection);

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frameLayout->addWidget(piecesList);

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frameLayout->addWidget(puzzleWidget);

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setCentralWidget(frame);

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}</pre>

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