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diff --git a/examples/widgets/itemviews/puzzle/puzzlewidget.cpp b/examples/widgets/itemviews/puzzle/puzzlewidget.cpp
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--- a/examples/widgets/itemviews/puzzle/puzzlewidget.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 "puzzlewidget.h"
-
-#include <QtWidgets>
-
-PuzzleWidget::PuzzleWidget(int imageSize, QWidget *parent)
- : QWidget(parent), m_ImageSize(imageSize)
-{
- setAcceptDrops(true);
- setMinimumSize(m_ImageSize, m_ImageSize);
- setMaximumSize(m_ImageSize, m_ImageSize);
-}
-
-void PuzzleWidget::clear()
-{
- pieces.clear();
- highlightedRect = QRect();
- inPlace = 0;
- update();
-}
-
-void PuzzleWidget::dragEnterEvent(QDragEnterEvent *event)
-{
- if (event->mimeData()->hasFormat("image/x-puzzle-piece"))
- event->accept();
- else
- event->ignore();
-}
-
-void PuzzleWidget::dragLeaveEvent(QDragLeaveEvent *event)
-{
- QRect updateRect = highlightedRect;
- highlightedRect = QRect();
- update(updateRect);
- event->accept();
-}
-
-void PuzzleWidget::dragMoveEvent(QDragMoveEvent *event)
-{
- QRect updateRect = highlightedRect.united(targetSquare(event->position().toPoint()));
-
- if (event->mimeData()->hasFormat("image/x-puzzle-piece")
- && findPiece(targetSquare(event->position().toPoint())) == -1) {
-
- highlightedRect = targetSquare(event->position().toPoint());
- event->setDropAction(Qt::MoveAction);
- event->accept();
- } else {
- highlightedRect = QRect();
- event->ignore();
- }
-
- update(updateRect);
-}
-
-void PuzzleWidget::dropEvent(QDropEvent *event)
-{
- if (event->mimeData()->hasFormat("image/x-puzzle-piece")
- && findPiece(targetSquare(event->position().toPoint())) == -1) {
-
- QByteArray pieceData = event->mimeData()->data("image/x-puzzle-piece");
- QDataStream dataStream(&pieceData, QIODevice::ReadOnly);
- Piece piece;
- piece.rect = targetSquare(event->position().toPoint());
- dataStream >> piece.pixmap >> piece.location;
-
- pieces.append(piece);
-
- highlightedRect = QRect();
- update(piece.rect);
-
- event->setDropAction(Qt::MoveAction);
- event->accept();
-
- if (piece.location == piece.rect.topLeft() / pieceSize()) {
- inPlace++;
- if (inPlace == 25)
- emit puzzleCompleted();
- }
- } else {
- highlightedRect = QRect();
- event->ignore();
- }
-}
-
-int PuzzleWidget::findPiece(const QRect &pieceRect) const
-{
- for (int i = 0, size = pieces.size(); i < size; ++i) {
- if (pieces.at(i).rect == pieceRect)
- return i;
- }
- return -1;
-}
-
-void PuzzleWidget::mousePressEvent(QMouseEvent *event)
-{
- QRect square = targetSquare(event->position().toPoint());
- int found = findPiece(square);
-
- if (found == -1)
- return;
-
- Piece piece = pieces.takeAt(found);
-
- if (piece.location == square.topLeft() / pieceSize())
- inPlace--;
-
- update(square);
-
- QByteArray itemData;
- QDataStream dataStream(&itemData, QIODevice::WriteOnly);
-
- dataStream << piece.pixmap << piece.location;
-
- QMimeData *mimeData = new QMimeData;
- mimeData->setData("image/x-puzzle-piece", itemData);
-
- QDrag *drag = new QDrag(this);
- drag->setMimeData(mimeData);
- drag->setHotSpot(event->position().toPoint() - square.topLeft());
- drag->setPixmap(piece.pixmap);
-
- if (drag->exec(Qt::MoveAction) == Qt::IgnoreAction) {
- pieces.insert(found, piece);
- update(targetSquare(event->position().toPoint()));
-
- if (piece.location == QPoint(square.x() / pieceSize(), square.y() / pieceSize()))
- inPlace++;
- }
-}
-
-void PuzzleWidget::paintEvent(QPaintEvent *event)
-{
- QPainter painter(this);
- painter.fillRect(event->rect(), Qt::white);
-
- if (highlightedRect.isValid()) {
- painter.setBrush(QColor("#ffcccc"));
- painter.setPen(Qt::NoPen);
- painter.drawRect(highlightedRect.adjusted(0, 0, -1, -1));
- }
-
- for (const Piece &piece : pieces)
- painter.drawPixmap(piece.rect, piece.pixmap);
-}
-
-const QRect PuzzleWidget::targetSquare(const QPoint &position) const
-{
- return QRect(position / pieceSize() * pieceSize(),
- QSize(pieceSize(), pieceSize()));
-}
-
-int PuzzleWidget::pieceSize() const
-{
- return m_ImageSize / 5;
-}
-
-int PuzzleWidget::imageSize() const
-{
- return m_ImageSize;
-}