Qt:Документация 4.3.2/draganddrop-fridgemagnets-dragwidget-cpp
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[править] dragwidget.cpp Example File
draganddrop/fridgemagnets/dragwidget.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 "draglabel.h" #include "dragwidget.h" DragWidget::DragWidget(QWidget *parent) : QWidget(parent) { QFile dictionaryFile(":/dictionary/words.txt"); dictionaryFile.open(QFile::ReadOnly); QTextStream inputStream(&dictionaryFile); int x = 5; int y = 5; while (!inputStream.atEnd()) { QString word; inputStream >> word; if (!word.isEmpty()) { DragLabel *wordLabel = new DragLabel(word, this); wordLabel->move(x, y); wordLabel->show(); x += wordLabel->width() + 2; if (x >= 245) { x = 5; y += wordLabel->height() + 2; } } } QPalette newPalette = palette(); newPalette.setColor(QPalette::Window, Qt::white); setPalette(newPalette); setMinimumSize(400, qMax(200, y)); setWindowTitle(tr("Fridge Magnets")); setAcceptDrops(true); } void DragWidget::dragEnterEvent(QDragEnterEvent *event) { if (event->mimeData()->hasFormat("application/x-fridgemagnet")) { if (children().contains(event->source())) { event->setDropAction(Qt::MoveAction); event->accept(); } else { event->acceptProposedAction(); } } else if (event->mimeData()->hasText()) { event->acceptProposedAction(); } else { event->ignore(); } } void DragWidget::dragMoveEvent(QDragMoveEvent *event) { if (event->mimeData()->hasFormat("application/x-fridgemagnet")) { if (children().contains(event->source())) { event->setDropAction(Qt::MoveAction); event->accept(); } else { event->acceptProposedAction(); } } else if (event->mimeData()->hasText()) { event->acceptProposedAction(); } else { event->ignore(); } } void DragWidget::dropEvent(QDropEvent *event) { if (event->mimeData()->hasFormat("application/x-fridgemagnet")) { const QMimeData *mime = event->mimeData(); QByteArray itemData = mime->data("application/x-fridgemagnet"); QDataStream dataStream(&itemData, QIODevice::ReadOnly); QString text; QPoint offset; dataStream >> text >> offset; DragLabel *newLabel = new DragLabel(text, this); newLabel->move(event->pos() - offset); newLabel->show(); if (children().contains(event->source())) { event->setDropAction(Qt::MoveAction); event->accept(); } else { event->acceptProposedAction(); } } else if (event->mimeData()->hasText()) { QStringList pieces = event->mimeData()->text().split(QRegExp("\\s+"), QString::SkipEmptyParts); QPoint position = event->pos(); foreach (QString piece, pieces) { DragLabel *newLabel = new DragLabel(piece, this); newLabel->move(position); newLabel->show(); position += QPoint(newLabel->width(), 0); } event->acceptProposedAction(); } else { event->ignore(); } }
Copyright © 2007 Trolltech | Trademarks | Qt 4.3.2
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