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diff --git a/examples/widgets/draganddrop/puzzle/mainwindow.cpp b/examples/widgets/draganddrop/puzzle/mainwindow.cpp
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--- a/examples/widgets/draganddrop/puzzle/mainwindow.cpp
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-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the examples of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:BSD$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** BSD License Usage
-** Alternatively, you may use this file under the terms of the BSD license
-** as follows:
-**
-** "Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-** * Redistributions of source code must retain the above copyright
-** notice, this list of conditions and the following disclaimer.
-** * Redistributions in binary form must reproduce the above copyright
-** notice, this list of conditions and the following disclaimer in
-** the documentation and/or other materials provided with the
-** distribution.
-** * Neither the name of The Qt Company Ltd nor the names of its
-** contributors may be used to endorse or promote products derived
-** from this software without specific prior written permission.
-**
-**
-** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#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 directory =
- QStandardPaths::standardLocations(QStandardPaths::PicturesLocation).value(0, QDir::homePath());
- QFileDialog dialog(this, tr("Open Image"), directory);
- dialog.setAcceptMode(QFileDialog::AcceptOpen);
- dialog.setFileMode(QFileDialog::ExistingFile);
- QStringList mimeTypeFilters;
- for (const QByteArray &mimeTypeName : QImageReader::supportedMimeTypes())
- mimeTypeFilters.append(mimeTypeName);
- mimeTypeFilters.sort();
- dialog.setMimeTypeFilters(mimeTypeFilters);
- dialog.selectMimeTypeFilter("image/jpeg");
- if (dialog.exec() == QDialog::Accepted)
- loadImage(dialog.selectedFiles().constFirst());
-}
-
-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));
- }
- }
-
- for (int i = 0; i < piecesList->count(); ++i) {
- if (QRandomGenerator::global()->bounded(2) == 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);
-}