Qt:Документация 4.3.2/draganddrop-puzzle-puzzlewidget-cpp
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[править] puzzlewidget.cpp Example File
draganddrop/puzzle/puzzlewidget.cpp
/**************************************************************************** ** ** Copyright (C) 2005-2007 Trolltech ASA. All rights reserved. ** ** This file is part of the example classes of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License version 2.0 as published by the Free Software Foundation ** and appearing in the file LICENSE.GPL included in the packaging of ** this file. Please review the following information to ensure GNU ** General Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/ ** ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** In addition, as a special exception, Trolltech gives you certain ** additional rights. These rights are described in the Trolltech GPL ** Exception version 1.0, which can be found at ** http://www.trolltech.com/products/qt/gplexception/ and in the file ** GPL_EXCEPTION.txt in this package. ** ** In addition, as a special exception, Trolltech, as the sole copyright ** holder for Qt Designer, grants users of the Qt/Eclipse Integration ** plug-in the right for the Qt/Eclipse Integration to link to ** functionality provided by Qt Designer and its related libraries. ** ** Trolltech reserves all rights not expressly granted herein. ** ** Trolltech ASA (c) 2007 ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ****************************************************************************/ #include <QtGui> #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 dataStream(&pieceData, QIODevice::ReadOnly); QRect square = targetSquare(event->pos()); QPixmap pixmap; QPoint location; dataStream >> 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->exec(Qt::MoveAction) == Qt::MoveAction)) { 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); }
Copyright © 2007 Trolltech | Trademarks | Qt 4.3.2
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