[2] | 1 | /****************************************************************************
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| 2 | **
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| 3 | ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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[561] | 4 | ** All rights reserved.
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| 5 | ** Contact: Nokia Corporation ([email protected])
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[2] | 6 | **
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| 7 | ** This file is part of the examples of the Qt Toolkit.
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| 8 | **
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| 9 | ** $QT_BEGIN_LICENSE:LGPL$
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| 10 | ** Commercial Usage
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| 11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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| 12 | ** accordance with the Qt Commercial License Agreement provided with the
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| 13 | ** Software or, alternatively, in accordance with the terms contained in
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| 14 | ** a written agreement between you and Nokia.
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| 15 | **
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| 16 | ** GNU Lesser General Public License Usage
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| 17 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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| 18 | ** General Public License version 2.1 as published by the Free Software
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| 19 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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| 20 | ** packaging of this file. Please review the following information to
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| 21 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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| 22 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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| 23 | **
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[561] | 24 | ** In addition, as a special exception, Nokia gives you certain additional
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| 25 | ** rights. These rights are described in the Nokia Qt LGPL Exception
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| 26 | ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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[2] | 27 | **
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| 28 | ** GNU General Public License Usage
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| 29 | ** Alternatively, this file may be used under the terms of the GNU
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| 30 | ** General Public License version 3.0 as published by the Free Software
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| 31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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| 32 | ** packaging of this file. Please review the following information to
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| 33 | ** ensure the GNU General Public License version 3.0 requirements will be
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| 34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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| 35 | **
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[561] | 36 | ** If you have questions regarding the use of this file, please contact
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| 37 | ** Nokia at [email protected].
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[2] | 38 | ** $QT_END_LICENSE$
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| 39 | **
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| 40 | ****************************************************************************/
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| 41 |
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| 42 | #include <QtGui>
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| 43 |
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| 44 | #include "dragwidget.h"
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| 45 |
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| 46 | //! [0]
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| 47 | DragWidget::DragWidget(QWidget *parent)
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| 48 | : QFrame(parent)
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| 49 | {
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| 50 | setMinimumSize(200, 200);
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| 51 | setFrameStyle(QFrame::Sunken | QFrame::StyledPanel);
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| 52 | setAcceptDrops(true);
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| 53 |
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| 54 | QLabel *boatIcon = new QLabel(this);
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| 55 | boatIcon->setPixmap(QPixmap(":/images/boat.png"));
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| 56 | boatIcon->move(20, 20);
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| 57 | boatIcon->show();
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| 58 | boatIcon->setAttribute(Qt::WA_DeleteOnClose);
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| 59 |
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| 60 | QLabel *carIcon = new QLabel(this);
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| 61 | carIcon->setPixmap(QPixmap(":/images/car.png"));
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| 62 | carIcon->move(120, 20);
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| 63 | carIcon->show();
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| 64 | carIcon->setAttribute(Qt::WA_DeleteOnClose);
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| 65 |
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| 66 | QLabel *houseIcon = new QLabel(this);
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| 67 | houseIcon->setPixmap(QPixmap(":/images/house.png"));
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| 68 | houseIcon->move(20, 120);
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| 69 | houseIcon->show();
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| 70 | houseIcon->setAttribute(Qt::WA_DeleteOnClose);
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| 71 | }
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| 72 | //! [0]
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| 73 |
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| 74 | void DragWidget::dragEnterEvent(QDragEnterEvent *event)
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| 75 | {
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| 76 | if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
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| 77 | if (event->source() == this) {
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| 78 | event->setDropAction(Qt::MoveAction);
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| 79 | event->accept();
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| 80 | } else {
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| 81 | event->acceptProposedAction();
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| 82 | }
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| 83 | } else {
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| 84 | event->ignore();
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| 85 | }
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| 86 | }
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| 87 |
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| 88 | void DragWidget::dragMoveEvent(QDragMoveEvent *event)
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| 89 | {
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| 90 | if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
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| 91 | if (event->source() == this) {
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| 92 | event->setDropAction(Qt::MoveAction);
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| 93 | event->accept();
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| 94 | } else {
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| 95 | event->acceptProposedAction();
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| 96 | }
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| 97 | } else {
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| 98 | event->ignore();
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| 99 | }
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| 100 | }
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| 101 |
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| 102 | void DragWidget::dropEvent(QDropEvent *event)
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| 103 | {
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| 104 | if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
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| 105 | QByteArray itemData = event->mimeData()->data("application/x-dnditemdata");
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| 106 | QDataStream dataStream(&itemData, QIODevice::ReadOnly);
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| 107 |
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| 108 | QPixmap pixmap;
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| 109 | QPoint offset;
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| 110 | dataStream >> pixmap >> offset;
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| 111 |
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| 112 | QLabel *newIcon = new QLabel(this);
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| 113 | newIcon->setPixmap(pixmap);
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| 114 | newIcon->move(event->pos() - offset);
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| 115 | newIcon->show();
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| 116 | newIcon->setAttribute(Qt::WA_DeleteOnClose);
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| 117 |
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| 118 | if (event->source() == this) {
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| 119 | event->setDropAction(Qt::MoveAction);
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| 120 | event->accept();
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| 121 | } else {
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| 122 | event->acceptProposedAction();
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| 123 | }
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| 124 | } else {
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| 125 | event->ignore();
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| 126 | }
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| 127 | }
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| 128 |
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| 129 | //! [1]
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| 130 | void DragWidget::mousePressEvent(QMouseEvent *event)
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| 131 | {
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| 132 | QLabel *child = static_cast<QLabel*>(childAt(event->pos()));
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| 133 | if (!child)
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| 134 | return;
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| 135 |
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| 136 | QPixmap pixmap = *child->pixmap();
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| 137 |
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| 138 | QByteArray itemData;
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| 139 | QDataStream dataStream(&itemData, QIODevice::WriteOnly);
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| 140 | dataStream << pixmap << QPoint(event->pos() - child->pos());
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| 141 | //! [1]
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| 142 |
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| 143 | //! [2]
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| 144 | QMimeData *mimeData = new QMimeData;
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| 145 | mimeData->setData("application/x-dnditemdata", itemData);
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| 146 | //! [2]
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| 147 |
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| 148 | //! [3]
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| 149 | QDrag *drag = new QDrag(this);
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| 150 | drag->setMimeData(mimeData);
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| 151 | drag->setPixmap(pixmap);
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| 152 | drag->setHotSpot(event->pos() - child->pos());
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| 153 | //! [3]
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| 154 |
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| 155 | QPixmap tempPixmap = pixmap;
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| 156 | QPainter painter;
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| 157 | painter.begin(&tempPixmap);
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| 158 | painter.fillRect(pixmap.rect(), QColor(127, 127, 127, 127));
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| 159 | painter.end();
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| 160 |
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| 161 | child->setPixmap(tempPixmap);
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| 162 |
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| 163 | if (drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction) == Qt::MoveAction)
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| 164 | child->close();
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| 165 | else {
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| 166 | child->show();
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| 167 | child->setPixmap(pixmap);
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| 168 | }
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| 169 | }
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