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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#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
{
QPoint topLeft = QPoint(position.x() / pieceSize(), position.y() / pieceSize()) * pieceSize();
return QRect(topLeft, QSize(pieceSize(), pieceSize()));
}
int PuzzleWidget::pieceSize() const
{
return m_ImageSize / 5;
}
int PuzzleWidget::imageSize() const
{
return m_ImageSize;
}
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