path: root/src/gui/doc/snippets/draganddrop/dragwidget.cpp

// Copyright (C) 2016 The Qt Company Ltd.// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause#include <QtGui>#include <QLabel>#include <QHBoxLayout>#include <QApplication>#include"dragwidget.h"DragWidget::DragWidget(QWidget *parent):QFrame(parent){setFrameStyle(QFrame::StyledPanel |QFrame::Sunken); dragDropLabel =newQLabel("",this); dragDropLabel->setAlignment(Qt::AlignHCenter); QHBoxLayout *layout =newQHBoxLayout(this); layout->addStretch(0); layout->addWidget(dragDropLabel); layout->addStretch(0);setAcceptDrops(true);}// Accept all actions, but deal with them separately later.//! [0]voidDragWidget::dragEnterEvent(QDragEnterEvent *event){ event->acceptProposedAction();}//! [0]//! [1]voidDragWidget::dropEvent(QDropEvent *event){if(event->source() ==this&& event->possibleActions() &Qt::MoveAction)return;//! [1]//! [2]if(event->proposedAction() ==Qt::MoveAction) { event->acceptProposedAction();// Process the data from the event.//! [2] emit dragResult(tr("The data was moved here."));//! [3]}else if(event->proposedAction() ==Qt::CopyAction) { event->acceptProposedAction();// Process the data from the event.//! [3] emit dragResult(tr("The data was copied here."));//! [4]}else{// Ignore the drop.return;}//! [4]// End of quote emit mimeTypes(event->mimeData()->formats());setData(event->mimeData()->formats()[0], event->mimeData()->data(event->mimeData()->formats()[0]));//! [5]}//! [5]//! [6]voidDragWidget::mousePressEvent(QMouseEvent *event){if(event->button() ==Qt::LeftButton) dragStartPosition = event->pos();}//! [6]//! [7]voidDragWidget::mouseMoveEvent(QMouseEvent *event){if(!(event->buttons() &Qt::LeftButton))return;if((event->pos() - dragStartPosition).manhattanLength()<QApplication::startDragDistance())return; QDrag *drag =newQDrag(this); QMimeData *mimeData =new QMimeData; mimeData->setData(mimeType, data); drag->setMimeData(mimeData);Qt::DropAction dropAction = drag->exec(Qt::CopyAction |Qt::MoveAction);//! [7]switch(dropAction) {caseQt::CopyAction: emit dragResult(tr("The text was copied."));break;caseQt::MoveAction: emit dragResult(tr("The text was moved."));break;default: emit dragResult(tr("Unknown action."));break;}//! [8]}//! [8]voidDragWidget::setData(const QString &mimetype,const QByteArray &newData){ mimeType = mimetype; data =QByteArray(newData); dragDropLabel->setText(tr("%1 bytes").arg(data.size())); QStringList formats; formats << mimetype; emit mimeTypes(formats);}