mirror of
https://github.com/crystalidea/qt6windows7.git
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132 lines
3.5 KiB
C++
132 lines
3.5 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include <QtWidgets>
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#include "dragwidget.h"
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//! [0]
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DragWidget::DragWidget(QWidget *parent)
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: QFrame(parent)
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{
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setMinimumSize(200, 200);
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setFrameStyle(QFrame::Sunken | QFrame::StyledPanel);
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setAcceptDrops(true);
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QLabel *boatIcon = new QLabel(this);
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boatIcon->setPixmap(QPixmap(":/images/boat.png"));
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boatIcon->move(10, 10);
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boatIcon->show();
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boatIcon->setAttribute(Qt::WA_DeleteOnClose);
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QLabel *carIcon = new QLabel(this);
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carIcon->setPixmap(QPixmap(":/images/car.png"));
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carIcon->move(100, 10);
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carIcon->show();
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carIcon->setAttribute(Qt::WA_DeleteOnClose);
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QLabel *houseIcon = new QLabel(this);
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houseIcon->setPixmap(QPixmap(":/images/house.png"));
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houseIcon->move(10, 80);
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houseIcon->show();
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houseIcon->setAttribute(Qt::WA_DeleteOnClose);
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}
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//! [0]
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void DragWidget::dragEnterEvent(QDragEnterEvent *event)
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{
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if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
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if (event->source() == this) {
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event->setDropAction(Qt::MoveAction);
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event->accept();
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} else {
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event->acceptProposedAction();
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}
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} else {
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event->ignore();
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}
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}
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void DragWidget::dragMoveEvent(QDragMoveEvent *event)
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{
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if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
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if (event->source() == this) {
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event->setDropAction(Qt::MoveAction);
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event->accept();
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} else {
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event->acceptProposedAction();
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}
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} else {
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event->ignore();
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}
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}
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void DragWidget::dropEvent(QDropEvent *event)
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{
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if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
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QByteArray itemData = event->mimeData()->data("application/x-dnditemdata");
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QDataStream dataStream(&itemData, QIODevice::ReadOnly);
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QPixmap pixmap;
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QPoint offset;
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dataStream >> pixmap >> offset;
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QLabel *newIcon = new QLabel(this);
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newIcon->setPixmap(pixmap);
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newIcon->move(event->position().toPoint() - offset);
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newIcon->show();
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newIcon->setAttribute(Qt::WA_DeleteOnClose);
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if (event->source() == this) {
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event->setDropAction(Qt::MoveAction);
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event->accept();
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} else {
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event->acceptProposedAction();
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}
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} else {
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event->ignore();
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}
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}
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//! [1]
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void DragWidget::mousePressEvent(QMouseEvent *event)
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{
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QLabel *child = static_cast<QLabel*>(childAt(event->position().toPoint()));
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if (!child)
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return;
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QPixmap pixmap = child->pixmap();
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QByteArray itemData;
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QDataStream dataStream(&itemData, QIODevice::WriteOnly);
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dataStream << pixmap << QPoint(event->position().toPoint() - child->pos());
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//! [1]
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//! [2]
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QMimeData *mimeData = new QMimeData;
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mimeData->setData("application/x-dnditemdata", itemData);
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//! [2]
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//! [3]
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QDrag *drag = new QDrag(this);
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drag->setMimeData(mimeData);
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drag->setPixmap(pixmap);
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drag->setHotSpot(event->position().toPoint() - child->pos());
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//! [3]
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QPixmap tempPixmap = pixmap;
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QPainter painter;
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painter.begin(&tempPixmap);
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painter.fillRect(pixmap.rect(), QColor(127, 127, 127, 127));
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painter.end();
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child->setPixmap(tempPixmap);
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if (drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction) == Qt::MoveAction) {
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child->close();
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} else {
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child->show();
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child->setPixmap(pixmap);
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}
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}
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