2b75c156b6
Change-Id: I6441ff931dbd33b698d762e6f6784898f3f60fe7 Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
213 lines
6.3 KiB
C++
213 lines
6.3 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "draglabel.h"
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#include "dragwidget.h"
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#include <QtWidgets>
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//! [0]
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DragWidget::DragWidget(QWidget *parent)
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: QWidget(parent)
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{
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QFile dictionaryFile(":/dictionary/words.txt");
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dictionaryFile.open(QFile::ReadOnly);
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QTextStream inputStream(&dictionaryFile);
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//! [0]
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//! [1]
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int x = 5;
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int y = 5;
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while (!inputStream.atEnd()) {
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QString word;
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inputStream >> word;
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if (!word.isEmpty()) {
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DragLabel *wordLabel = new DragLabel(word, this);
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wordLabel->move(x, y);
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wordLabel->show();
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wordLabel->setAttribute(Qt::WA_DeleteOnClose);
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x += wordLabel->width() + 2;
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if (x >= 245) {
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x = 5;
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y += wordLabel->height() + 2;
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}
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}
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}
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//! [1]
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//! [2]
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//Fridge magnets is used for demoing Qt on S60 and themed backgrounds look better than white
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QPalette newPalette = palette();
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newPalette.setColor(QPalette::Window, Qt::white);
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setPalette(newPalette);
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setMinimumSize(400, qMax(200, y));
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setWindowTitle(tr("Fridge Magnets"));
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//! [2] //! [3]
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setAcceptDrops(true);
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}
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//! [3]
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//! [4]
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void DragWidget::dragEnterEvent(QDragEnterEvent *event)
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{
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//! [4] //! [5]
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if (event->mimeData()->hasFormat("application/x-fridgemagnet")) {
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if (children().contains(event->source())) {
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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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//! [5] //! [6]
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}
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//! [6] //! [7]
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} else if (event->mimeData()->hasText()) {
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event->acceptProposedAction();
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} else {
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event->ignore();
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}
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}
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//! [7]
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//! [8]
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void DragWidget::dragMoveEvent(QDragMoveEvent *event)
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{
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if (event->mimeData()->hasFormat("application/x-fridgemagnet")) {
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if (children().contains(event->source())) {
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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 if (event->mimeData()->hasText()) {
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event->acceptProposedAction();
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} else {
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event->ignore();
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}
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}
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//! [8]
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//! [9]
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void DragWidget::dropEvent(QDropEvent *event)
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{
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if (event->mimeData()->hasFormat("application/x-fridgemagnet")) {
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const QMimeData *mime = event->mimeData();
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//! [9] //! [10]
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QByteArray itemData = mime->data("application/x-fridgemagnet");
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QDataStream dataStream(&itemData, QIODevice::ReadOnly);
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QString text;
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QPoint offset;
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dataStream >> text >> offset;
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//! [10]
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//! [11]
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DragLabel *newLabel = new DragLabel(text, this);
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newLabel->move(event->pos() - offset);
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newLabel->show();
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newLabel->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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//! [11] //! [12]
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} else if (event->mimeData()->hasText()) {
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QStringList pieces = event->mimeData()->text().split(QRegExp("\\s+"),
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QString::SkipEmptyParts);
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QPoint position = event->pos();
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foreach (QString piece, pieces) {
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DragLabel *newLabel = new DragLabel(piece, this);
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newLabel->move(position);
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newLabel->show();
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newLabel->setAttribute(Qt::WA_DeleteOnClose);
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position += QPoint(newLabel->width(), 0);
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}
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event->acceptProposedAction();
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} else {
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event->ignore();
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}
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}
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//! [12]
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//! [13]
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void DragWidget::mousePressEvent(QMouseEvent *event)
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{
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//! [13]
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//! [14]
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DragLabel *child = static_cast<DragLabel*>(childAt(event->pos()));
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if (!child)
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return;
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QPoint hotSpot = event->pos() - child->pos();
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QByteArray itemData;
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QDataStream dataStream(&itemData, QIODevice::WriteOnly);
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dataStream << child->labelText() << QPoint(hotSpot);
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//! [14]
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//! [15]
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QMimeData *mimeData = new QMimeData;
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mimeData->setData("application/x-fridgemagnet", itemData);
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mimeData->setText(child->labelText());
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//! [15]
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//! [16]
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QDrag *drag = new QDrag(this);
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drag->setMimeData(mimeData);
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drag->setPixmap(*child->pixmap());
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drag->setHotSpot(hotSpot);
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child->hide();
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//! [16]
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//! [17]
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if (drag->exec(Qt::MoveAction | Qt::CopyAction, 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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}
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//! [17]
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