qt5base-lts/examples/itemviews/puzzle/puzzlewidget.cpp

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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 Nokia Corporation and its Subsidiary(-ies) 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 <QtWidgets>
#include "puzzlewidget.h"
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()
{
pieceLocations.clear();
piecePixmaps.clear();
pieceRects.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.unite(targetSquare(event->pos()));
if (event->mimeData()->hasFormat("image/x-puzzle-piece")
&& findPiece(targetSquare(event->pos())) == -1) {
highlightedRect = targetSquare(event->pos());
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->pos())) == -1) {
QByteArray pieceData = event->mimeData()->data("image/x-puzzle-piece");
QDataStream stream(&pieceData, QIODevice::ReadOnly);
QRect square = targetSquare(event->pos());
QPixmap pixmap;
QPoint location;
stream >> pixmap >> location;
pieceLocations.append(location);
piecePixmaps.append(pixmap);
pieceRects.append(square);
highlightedRect = QRect();
update(square);
event->setDropAction(Qt::MoveAction);
event->accept();
if (location == QPoint(square.x()/pieceSize(), square.y()/pieceSize())) {
inPlace++;
if (inPlace == 25)
emit puzzleCompleted();
}
} else {
highlightedRect = QRect();
event->ignore();
}
}
int PuzzleWidget::findPiece(const QRect &pieceRect) const
{
for (int i = 0; i < pieceRects.size(); ++i) {
if (pieceRect == pieceRects[i]) {
return i;
}
}
return -1;
}
void PuzzleWidget::mousePressEvent(QMouseEvent *event)
{
QRect square = targetSquare(event->pos());
int found = findPiece(square);
if (found == -1)
return;
QPoint location = pieceLocations[found];
QPixmap pixmap = piecePixmaps[found];
pieceLocations.removeAt(found);
piecePixmaps.removeAt(found);
pieceRects.removeAt(found);
if (location == QPoint(square.x()/pieceSize(), square.y()/pieceSize()))
inPlace--;
update(square);
QByteArray itemData;
QDataStream dataStream(&itemData, QIODevice::WriteOnly);
dataStream << pixmap << location;
QMimeData *mimeData = new QMimeData;
mimeData->setData("image/x-puzzle-piece", itemData);
QDrag *drag = new QDrag(this);
drag->setMimeData(mimeData);
drag->setHotSpot(event->pos() - square.topLeft());
drag->setPixmap(pixmap);
if (drag->start(Qt::MoveAction) == 0) {
pieceLocations.insert(found, location);
piecePixmaps.insert(found, pixmap);
pieceRects.insert(found, square);
update(targetSquare(event->pos()));
if (location == QPoint(square.x()/pieceSize(), square.y()/pieceSize()))
inPlace++;
}
}
void PuzzleWidget::paintEvent(QPaintEvent *event)
{
QPainter painter;
painter.begin(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 (int i = 0; i < pieceRects.size(); ++i) {
painter.drawPixmap(pieceRects[i], piecePixmaps[i]);
}
painter.end();
}
const QRect PuzzleWidget::targetSquare(const QPoint &position) const
{
return QRect(position.x()/pieceSize() * pieceSize(), position.y()/pieceSize() * pieceSize(), pieceSize(), pieceSize());
}
int PuzzleWidget::pieceSize() const
{
return m_ImageSize / 5;
}
int PuzzleWidget::imageSize() const
{
return m_ImageSize;
}