puzzlewidget.cpp Example File

itemviews/puzzle/puzzlewidget.cpp
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#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() { 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.united(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; }