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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
/*
finalwidget.cpp
A widget to display an image and a label containing a description.
*/
#include "finalwidget.h"
#include <QApplication>
#include <QBuffer>
#include <QDrag>
#include <QLabel>
#include <QMimeData>
#include <QMouseEvent>
#include <QVBoxLayout>
FinalWidget::FinalWidget(QWidget *parent, const QString &name,
const QSize &labelSize)
: QFrame(parent)
{
hasImage = false;
imageLabel = new QLabel;
imageLabel->setFrameShadow(QFrame::Sunken);
imageLabel->setFrameShape(QFrame::StyledPanel);
imageLabel->setMinimumSize(labelSize);
nameLabel = new QLabel(name);
QVBoxLayout *layout = new QVBoxLayout(this);
layout->addWidget(imageLabel, 1);
layout->addWidget(nameLabel, 0);
}
/*!
If the mouse moves far enough when the left mouse button is held down,
start a drag and drop operation.
*/
void FinalWidget::mouseMoveEvent(QMouseEvent *event)
{
if (!(event->buttons() & Qt::LeftButton))
return;
if ((event->pos() - dragStartPosition).manhattanLength()
< QApplication::startDragDistance())
return;
if (!hasImage)
return;
QDrag *drag = new QDrag(this);
QMimeData *mimeData = new QMimeData;
//! [0]
QByteArray output;
QBuffer outputBuffer(&output);
outputBuffer.open(QIODevice::WriteOnly);
imageLabel->pixmap().toImage().save(&outputBuffer, "PNG");
mimeData->setData("image/png", output);
//! [0]
/*
//! [1]
mimeData->setImageData(QVariant(*imageLabel->pixmap()));
//! [1]
*/
drag->setMimeData(mimeData);
drag->setPixmap(imageLabel->pixmap().scaled(64, 64, Qt::KeepAspectRatio));
//! [2]
drag->setHotSpot(QPoint(drag->pixmap().width()/2,
drag->pixmap().height()));
//! [2]
}
/*!
Check for left mouse button presses in order to enable drag and drop.
*/
void FinalWidget::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton)
dragStartPosition = event->pos();
}
QPixmap FinalWidget::pixmap() const
{
return imageLabel->pixmap();
}
void FinalWidget::setPixmap(const QPixmap &pixmap)
{
imageLabel->setPixmap(pixmap);
hasImage = true;
}