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#include "UBDragableThumbnail.h"
#include <QPainter>
#include <QMimeData>
#include <QDrag>
UBDraggableThumbnail::UBDraggableThumbnail(QWidget* parent, const QPixmap& pixmap) :
QFrame(parent)
, mThumbnail(new QLabel(this))
, mHBoxLayout(new QHBoxLayout(this))
{
setFrameStyle(QFrame::Sunken | QFrame::StyledPanel);
setAcceptDrops(true);
//set stylesheet
setObjectName("DockPaletteWidgetBox");
setStyleSheet("background:white");
mHBoxLayout->setAlignment(Qt::AlignHCenter);
setThumbnail(pixmap);
setLayout(mHBoxLayout);
}
void UBDraggableThumbnail::setThumbnail(const QPixmap& pixmap)
{
mThumbnail->setAttribute(Qt::WA_DeleteOnClose);
setPixmap(pixmap);
mHBoxLayout->addWidget(mThumbnail);
}
void UBDraggableThumbnail::setPixmap(const QPixmap& pixmap)
{
mThumbnail->setPixmap(pixmap);
}
void UBDraggableThumbnail::dragEnterEvent(QDragEnterEvent *event)
{
if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
if (event->source() == this) {
event->setDropAction(Qt::MoveAction);
event->accept();
} else {
event->acceptProposedAction();
}
} else {
event->ignore();
}
}
void UBDraggableThumbnail::dragMoveEvent(QDragMoveEvent *event)
{
if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
if (event->source() == this) {
event->setDropAction(Qt::MoveAction);
event->accept();
} else {
event->acceptProposedAction();
}
} else {
event->ignore();
}
}
void UBDraggableThumbnail::dropEvent(QDropEvent *event)
{
if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
QByteArray itemData = event->mimeData()->data("application/x-dnditemdata");
QDataStream dataStream(&itemData, QIODevice::ReadOnly);
QPixmap pixmap;
QPoint offset;
dataStream >> pixmap >> offset;
//don't have to delete previous Thumbnail (Drag'n'Drop behavior with WA_DeleteOnClose attribute will do it)
mThumbnail = new QLabel(this);
setThumbnail(pixmap);
if (event->source() == this) {
event->setDropAction(Qt::MoveAction);
event->accept();
} else {
event->acceptProposedAction();
}
} else {
event->ignore();
}
}
void UBDraggableThumbnail::mousePressEvent(QMouseEvent *event)
{
QLabel *child = static_cast<QLabel*>(childAt(event->pos()));
if (!child)
return;
QPixmap pixmap = *child->pixmap();
QByteArray itemData;
QDataStream dataStream(&itemData, QIODevice::WriteOnly);
dataStream << pixmap << QPoint(event->pos() - child->pos());
QMimeData *mimeData = new QMimeData;
mimeData->setData("application/x-dnditemdata", itemData);
QDrag *drag = new QDrag(this);
drag->setMimeData(mimeData);
drag->setPixmap(pixmap);
drag->setHotSpot(event->pos() - child->pos());
QPixmap tempPixmap = pixmap;
QPainter painter;
painter.begin(&tempPixmap);
painter.fillRect(pixmap.rect(), QColor(127, 127, 127, 127));
painter.end();
child->setPixmap(tempPixmap);
if (drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction) == Qt::MoveAction)
child->close();
else {
child->show();
child->setPixmap(pixmap);
}
}