qt-everywhere-src-5.14.1/qtbase/src/corelib/doc/snippets/code/src_corelib_kernel_qmimedata.cpp

/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

//! [0]
void MyWidget::dragEnterEvent(QDragEnterEvent *event)
{
    if (event->mimeData()->hasUrls())
        event->acceptProposedAction();
}

void MyWidget::dropEvent(QDropEvent *event)
{
    if (event->mimeData()->hasUrls()) {
        foreach (QUrl url, event->mimeData()->urls()) {
            ...
        }
    }
}
//! [0]


//! [1]
QByteArray csvData = ...;

QMimeData *mimeData = new QMimeData;
mimeData->setData("text/csv", csvData);
//! [1]


//! [2]
void MyWidget::dropEvent(QDropEvent *event)
{
    const MyMimeData *myData =
            qobject_cast<const MyMimeData *>(event->mimeData());
    if (myData) {
        // access myData's data directly (not through QMimeData's API)
    }
}
//! [2]


//! [3]
application/x-qt-windows-mime;value="<custom type>"
//! [3]


//! [4]
application/x-qt-windows-mime;value="FileGroupDescriptor"
application/x-qt-windows-mime;value="FileContents"
//! [4]


//! [5]
if (event->mimeData()->hasImage()) {
    QImage image = qvariant_cast<QImage>(event->mimeData()->imageData());
    ...
}
//! [5]


//! [6]
mimeData->setImageData(QImage("beautifulfjord.png"));
//! [6]


//! [7]
if (event->mimeData()->hasColor()) {
    QColor color = qvariant_cast<QColor>(event->mimeData()->colorData());
    ...
}
//! [7]


//! [8]
application/x-qt-windows-mime;value="FileContents";index=0
application/x-qt-windows-mime;value="FileContents";index=1
//! [8]