/**************************************************************************** ** ** Copyright (C) 2010 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 #include "puzzlewidget.h" PuzzleWidget::PuzzleWidget(QWidget *parent) : QWidget(parent) { setAcceptDrops(true); setMinimumSize(400, 400); setMaximumSize(400, 400); } 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()/80, square.y()/80)) { 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()/80, square.y()/80)) 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()/80, square.y()/80)) 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()/80 * 80, position.y()/80 * 80, 80, 80); }