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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">dragwidget.cpp Example File<br /><small><small>draganddrop/fridgemagnets/dragwidget.cpp</small></small></h1>

<pre>  /****************************************************************************

** This file is part of the documentation of the Qt Toolkit.

** This file may be distributed under the terms of the Q Public License

** as defined by Trolltech AS of Norway and appearing in the file

** LICENSE.QPL included in the packaging of this file.

** This file may be distributed and/or modified under the terms of the

** GNU General Public License version 2 as published by the Free Software

** Foundation and appearing in the file LICENSE.GPL included in the

** packaging of this file.

** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for

** information about Qt Commercial License Agreements.

** See http://www.trolltech.com/qpl/ for QPL licensing information.

** See http://www.trolltech.com/gpl/ for GPL licensing information.

** Contact info@trolltech.com if any conditions of this licensing are

** not clear to you.

** 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::Background, Qt::white);

setPalette(newPalette);

setAcceptDrops(true);

setMinimumSize(400, qMax(200, y));

setWindowTitle(tr("Fridge Magnets"));

}

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();

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}

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}

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void DragWidget::dragMoveEvent(QDragMoveEvent *event)

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{

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if (event->mimeData()->hasFormat("application/x-fridgemagnet")) {

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if (children().contains(event->source())) {

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event->setDropAction(Qt::MoveAction);

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event->accept();

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} else {

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event->acceptProposedAction();

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}

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} else if (event->mimeData()->hasText()) {

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event->acceptProposedAction();

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} else {

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event->ignore();

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}

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}

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void DragWidget::dropEvent(QDropEvent *event)

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{

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if (event->mimeData()->hasFormat("application/x-fridgemagnet")) {

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QByteArray itemData = event->mimeData()->data("application/x-fridgemagnet");

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QDataStream dataStream(&itemData, QIODevice::ReadOnly);

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QString text;

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QPoint offset;

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dataStream >> text >> offset;

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DragLabel *newLabel = new DragLabel(text, this);

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newLabel->move(event->pos() - offset);

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newLabel->show();

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if (children().contains(event->source())) {

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event->setDropAction(Qt::MoveAction);

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event->accept();

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} else {

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event->acceptProposedAction();

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}

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} else if (event->mimeData()->hasText()) {

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QStringList pieces = event->mimeData()->text().split(QRegExp("\\s+"),

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QString::SkipEmptyParts);

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QPoint position = event->pos();

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foreach (QString piece, pieces) {

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DragLabel *newLabel = new DragLabel(piece, this);

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newLabel->move(position);

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newLabel->show();

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position += QPoint(newLabel->width(), 0);

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}

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event->acceptProposedAction();

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} else {

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event->ignore();

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}

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}</pre>

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