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主程序:该程序演示,左右两个窗口可以互相拖动数据:文本数据的传递可以用下面的方法:
event->mimeData()->text();//取
mimeData->setText();//放
拖动时获取当前窗口的图像:QPixmap pixMap = QPixmap::grabWidget(this);
- #include <QApplication>
- #include <QHBoxLayout>
- #include "dragwidget.h"
- int main(int argc, char *argv[])
- {
- Q_INIT_RESOURCE(draggableicons);
- QApplication app(argc, argv);
- QWidget mainWidget;
- QHBoxLayout *horizontalLayout = new QHBoxLayout(&mainWidget);
- horizontalLayout->addWidget(new DragWidget);
- horizontalLayout->addWidget(new DragWidget);
- mainWidget.setWindowTitle(QObject::tr("Draggable Icons"));
- mainWidget.show();
- return app.exec();
- }
复制代码 支持拖出拖入的窗口:
- /****************************************************************************
- **
- ** Copyright (C) 2016 The Qt Company Ltd.
- ** Contact: https://www.qt.io/licensing/
- **
- ** This file is part of the examples 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."
- **
- ** $QT_END_LICENSE$
- **
- ****************************************************************************/
- #ifndef DRAGWIDGET_H
- #define DRAGWIDGET_H
- #include <QFrame>
- QT_BEGIN_NAMESPACE
- class QDragEnterEvent;
- class QDropEvent;
- QT_END_NAMESPACE
- //! [0]
- class DragWidget : public QFrame
- {
- public:
- explicit DragWidget(QWidget *parent = nullptr);
- protected:
- void dragEnterEvent(QDragEnterEvent *event) override;
- void dragMoveEvent(QDragMoveEvent *event) override;
- void dropEvent(QDropEvent *event) override;
- void mousePressEvent(QMouseEvent *event) override;
- };
- //! [0]
- #endif // DRAGWIDGET_H
- Cpp文件:
- /****************************************************************************
- **
- ** Copyright (C) 2016 The Qt Company Ltd.
- ** Contact: https://www.qt.io/licensing/
- **
- ** This file is part of the examples 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."
- **
- ** $QT_END_LICENSE$
- **
- ****************************************************************************/
- #include <QtWidgets>
- #include "dragwidget.h"
- #include <qdebug.h>
- //! [0]
- DragWidget::DragWidget(QWidget *parent)
- : QFrame(parent)
- {
- setMinimumSize(200, 200);
- setFrameStyle(QFrame::Sunken | QFrame::StyledPanel);
- setAcceptDrops(true);
- QLabel *boatIcon = new QLabel(this);
- boatIcon->setPixmap(QPixmap(":/images/boat.png"));
- boatIcon->move(10, 10);
- boatIcon->show();
- boatIcon->setAttribute(Qt::WA_DeleteOnClose);
- QLabel *carIcon = new QLabel(this);
- carIcon->setPixmap(QPixmap(":/images/car.png"));
- carIcon->move(100, 10);
- carIcon->show();
- carIcon->setAttribute(Qt::WA_DeleteOnClose);
- QLabel *houseIcon = new QLabel(this);
- houseIcon->setPixmap(QPixmap(":/images/house.png"));
- houseIcon->move(10, 80);
- houseIcon->show();
- houseIcon->setAttribute(Qt::WA_DeleteOnClose);
- }
- //! [0]
- void DragWidget::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 DragWidget::dragMoveEvent(QDragMoveEvent *event)
- {
- if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
- if (event->source() == this) {
- event->setDropAction(Qt::MoveAction);
- event->accept();
- qDebug()<<"dragMoveEvent\n";
- } else {
- event->acceptProposedAction();
- }
- } else {
- event->ignore();
- }
- }
- void DragWidget::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;
- QLabel *newIcon = new QLabel(this);
- newIcon->setPixmap(pixmap);
- newIcon->move(event->pos() - offset);
- newIcon->show();
- newIcon->setAttribute(Qt::WA_DeleteOnClose);
- if (event->source() == this) {
- event->setDropAction(Qt::MoveAction);
- event->accept();
- } else {
- event->acceptProposedAction();
- }
- } else {
- event->ignore();
- }
- }
- //! [1]
- void DragWidget::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());
- //! [1]
- //! [2]
- QMimeData *mimeData = new QMimeData;
- mimeData->setData("application/x-dnditemdata", itemData);
-
- //! [2]
- //! [3]
- QDrag *drag = new QDrag(this);
- drag->setMimeData(mimeData);
- drag->setPixmap(pixmap);
- drag->setHotSpot(event->pos() - child->pos());
- //! [3]
- 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);
- }
- }
复制代码
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