Home · All Namespaces · All Classes · Main Classes · Grouped Classes · Modules · Functions

droparea.cpp Example File
draganddrop/dropsite/droparea.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: Qt Software Information ([email protected])
 **
 ** 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 1.0, 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 are unsure which license is appropriate for your use, please
 ** contact the sales department at [email protected].
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include <QtGui>

 #include "droparea.h"

 DropArea::DropArea(QWidget *parent)
     : QLabel(parent)
 {
     setMinimumSize(200, 200);
     setFrameStyle(QFrame::Sunken | QFrame::StyledPanel);
     setAlignment(Qt::AlignCenter);
     setAcceptDrops(true);
     setAutoFillBackground(true);
     clear();
 }

 void DropArea::dragEnterEvent(QDragEnterEvent *event)
 {
     setText(tr("<drop content>"));
     setBackgroundRole(QPalette::Highlight);

     event->acceptProposedAction();
     emit changed(event->mimeData());
 }

 void DropArea::dragMoveEvent(QDragMoveEvent *event)
 {
     event->acceptProposedAction();
 }

 void DropArea::dropEvent(QDropEvent *event)
 {
     const QMimeData *mimeData = event->mimeData();

     if (mimeData->hasImage()) {
         setPixmap(qvariant_cast<QPixmap>(mimeData->imageData()));
     } else if (mimeData->hasHtml()) {
         setText(mimeData->html());
         setTextFormat(Qt::RichText);
     } else if (mimeData->hasText()) {
         setText(mimeData->text());
         setTextFormat(Qt::PlainText);
     } else if (mimeData->hasUrls()) {
         QList<QUrl> urlList = mimeData->urls();
         QString text;
         for (int i = 0; i < urlList.size() && i < 32; ++i) {
             QString url = urlList.at(i).path();
             text += url + QString("\n");
         }
         setText(text);
     } else {
         setText(tr("Cannot display data"));
     }

     setBackgroundRole(QPalette::Dark);
     event->acceptProposedAction();
 }

 void DropArea::dragLeaveEvent(QDragLeaveEvent *event)
 {
     clear();
     event->accept();
 }

 void DropArea::clear()
 {
     setText(tr("<drop content>"));
     setBackgroundRole(QPalette::Dark);

     emit changed();
 }