879f98106d
Introduce nullptr and replace foreach with new C++11 range based for loops. Minor fixups of signals, file dialog usage. Apply the same changes to the ItemViews/puzzle example since it shares parts of the code with DragAndDrop/puzzle. Make some changes to both examples to that the diff of the two becomes small for easier comparison. Task-number: QTBUG-60635 Change-Id: I8af824229ebac24d6ec151eae92176d227695490 Reviewed-by: Venugopal Shivashankar <Venugopal.Shivashankar@qt.io> Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
178 lines
6.0 KiB
C++
178 lines
6.0 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://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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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** 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 <QtWidgets>
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#include "dragwidget.h"
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static QLabel *createDragLabel(const QString &text, QWidget *parent)
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{
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QLabel *label = new QLabel(text, parent);
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label->setAutoFillBackground(true);
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label->setFrameShape(QFrame::Panel);
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label->setFrameShadow(QFrame::Raised);
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return label;
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}
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static QString hotSpotMimeDataKey() { return QStringLiteral("application/x-hotspot"); }
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DragWidget::DragWidget(QWidget *parent)
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: QWidget(parent)
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{
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QFile dictionaryFile(QStringLiteral(":/dictionary/words.txt"));
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dictionaryFile.open(QIODevice::ReadOnly);
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QTextStream inputStream(&dictionaryFile);
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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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QLabel *wordLabel = createDragLabel(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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setAcceptDrops(true);
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setMinimumSize(400, qMax(200, y));
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setWindowTitle(tr("Draggable Text"));
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}
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void DragWidget::dragEnterEvent(QDragEnterEvent *event)
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{
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if (event->mimeData()->hasText()) {
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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()->hasText()) {
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const QMimeData *mime = event->mimeData();
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QStringList pieces = mime->text().split(QRegularExpression(QStringLiteral("\\s+")),
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QString::SkipEmptyParts);
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QPoint position = event->pos();
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QPoint hotSpot;
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QByteArrayList hotSpotPos = mime->data(hotSpotMimeDataKey()).split(' ');
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if (hotSpotPos.size() == 2) {
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hotSpot.setX(hotSpotPos.first().toInt());
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hotSpot.setY(hotSpotPos.last().toInt());
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}
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for (const QString &piece : pieces) {
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QLabel *newLabel = createDragLabel(piece, this);
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newLabel->move(position - hotSpot);
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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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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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for (QWidget *widget : findChildren<QWidget *>()) {
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if (!widget->isVisible())
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widget->deleteLater();
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}
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}
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void DragWidget::mousePressEvent(QMouseEvent *event)
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{
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QLabel *child = qobject_cast<QLabel*>(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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QMimeData *mimeData = new QMimeData;
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mimeData->setText(child->text());
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mimeData->setData(hotSpotMimeDataKey(),
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QByteArray::number(hotSpot.x()) + ' ' + QByteArray::number(hotSpot.y()));
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qreal dpr = window()->windowHandle()->devicePixelRatio();
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QPixmap pixmap(child->size() * dpr);
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pixmap.setDevicePixelRatio(dpr);
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child->render(&pixmap);
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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(hotSpot);
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Qt::DropAction dropAction = drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction);
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if (dropAction == Qt::MoveAction)
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child->close();
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}
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