<?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>Qt 4.6: dragwidget.cpp Example File (draganddrop/draggabletext/dragwidget.cpp)</title> <link href="classic.css" rel="stylesheet" type="text/css" /> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td align="left" valign="top" width="32"><a href="http://qt.nokia.com/"><img src="images/qt-logo.png" align="left" border="0" /></a></td> <td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">dragwidget.cpp Example File<br /><span class="small-subtitle">draganddrop/draggabletext/dragwidget.cpp</span> </h1> <pre><span class="comment"> /**************************************************************************** ** ** 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. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial Usage ** Licensees holding valid Qt Commercial licenses may use this file in ** accordance with the Qt Commercial License Agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and Nokia. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain additional ** rights. These rights are described in the Nokia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** $QT_END_LICENSE$ ** ****************************************************************************/</span> #include <QtGui> #include "draglabel.h" #include "dragwidget.h" DragWidget::DragWidget(QWidget *parent) : QWidget(parent) { QFile dictionaryFile(":/dictionary/words.txt"); dictionaryFile.open(QIODevice::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(); wordLabel->setAttribute(Qt::WA_DeleteOnClose); x += wordLabel->width() + 2; if (x >= 195) { x = 5; y += wordLabel->height() + 2; } } } QPalette newPalette = palette(); newPalette.setColor(QPalette::Window, Qt::white); setPalette(newPalette); setAcceptDrops(true); setMinimumSize(400, qMax(200, y)); setWindowTitle(tr("Draggable Text")); } void DragWidget::dragEnterEvent(QDragEnterEvent *event) { if (event->mimeData()->hasText()) { if (children().contains(event->source())) { event->setDropAction(Qt::MoveAction); event->accept(); } else { event->acceptProposedAction(); } } else { event->ignore(); } } void DragWidget::dropEvent(QDropEvent *event) { if (event->mimeData()->hasText()) { const QMimeData *mime = event->mimeData(); QStringList pieces = mime->text().split(QRegExp("\\s+"), QString::SkipEmptyParts); QPoint position = event->pos(); QPoint hotSpot; QList<QByteArray> hotSpotPos = mime->data("application/x-hotspot").split(' '); if (hotSpotPos.size() == 2) { hotSpot.setX(hotSpotPos.first().toInt()); hotSpot.setY(hotSpotPos.last().toInt()); } foreach (QString piece, pieces) { DragLabel *newLabel = new DragLabel(piece, this); newLabel->move(position - hotSpot); newLabel->show(); newLabel->setAttribute(Qt::WA_DeleteOnClose); position += QPoint(newLabel->width(), 0); } if (event->source() == this) { event->setDropAction(Qt::MoveAction); event->accept(); } else { event->acceptProposedAction(); } } else { event->ignore(); } foreach (QObject *child, children()) { if (child->inherits("QWidget")) { QWidget *widget = static_cast<QWidget *>(child); if (!widget->isVisible()) widget->deleteLater(); } } } void DragWidget::mousePressEvent(QMouseEvent *event) { QLabel *child = static_cast<QLabel*>(childAt(event->pos())); if (!child) return; QPoint hotSpot = event->pos() - child->pos(); QMimeData *mimeData = new QMimeData; mimeData->setText(child->text()); mimeData->setData("application/x-hotspot", QByteArray::number(hotSpot.x()) + " " + QByteArray::number(hotSpot.y())); QPixmap pixmap(child->size()); child->render(&pixmap); QDrag *drag = new QDrag(this); drag->setMimeData(mimeData); drag->setPixmap(pixmap); drag->setHotSpot(hotSpot); Qt::DropAction dropAction = drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction); if (dropAction == Qt::MoveAction) child->close(); }</pre> <p /><address><hr /><div align="center"> <table width="100%" cellspacing="0" border="0"><tr class="address"> <td width="40%" align="left">Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies)</td> <td width="20%" align="center"><a href="trademarks.html">Trademarks</a></td> <td width="40%" align="right"><div align="right">Qt 4.6.3</div></td> </tr></table></div></address></body> </html>