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>
135 lines
4.8 KiB
C++
135 lines
4.8 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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** 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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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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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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** * Redistributions of source code must retain the above copyright
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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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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "pieceslist.h"
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#include <QDrag>
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#include <QDragEnterEvent>
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#include <QMimeData>
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PiecesList::PiecesList(int pieceSize, QWidget *parent)
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: QListWidget(parent), m_PieceSize(pieceSize)
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{
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setDragEnabled(true);
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setViewMode(QListView::IconMode);
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setIconSize(QSize(m_PieceSize, m_PieceSize));
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setSpacing(10);
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setAcceptDrops(true);
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setDropIndicatorShown(true);
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}
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void PiecesList::dragEnterEvent(QDragEnterEvent *event)
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{
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if (event->mimeData()->hasFormat(PiecesList::puzzleMimeType()))
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event->accept();
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else
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event->ignore();
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}
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void PiecesList::dragMoveEvent(QDragMoveEvent *event)
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{
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if (event->mimeData()->hasFormat(PiecesList::puzzleMimeType())) {
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event->setDropAction(Qt::MoveAction);
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event->accept();
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} else {
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event->ignore();
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}
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}
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void PiecesList::dropEvent(QDropEvent *event)
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{
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if (event->mimeData()->hasFormat(PiecesList::puzzleMimeType())) {
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QByteArray pieceData = event->mimeData()->data(PiecesList::puzzleMimeType());
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QDataStream dataStream(&pieceData, QIODevice::ReadOnly);
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QPixmap pixmap;
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QPoint location;
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dataStream >> pixmap >> location;
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addPiece(pixmap, location);
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event->setDropAction(Qt::MoveAction);
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event->accept();
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} else {
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event->ignore();
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}
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}
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void PiecesList::addPiece(const QPixmap &pixmap, const QPoint &location)
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{
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QListWidgetItem *pieceItem = new QListWidgetItem(this);
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pieceItem->setIcon(QIcon(pixmap));
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pieceItem->setData(Qt::UserRole, QVariant(pixmap));
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pieceItem->setData(Qt::UserRole+1, location);
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pieceItem->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsDragEnabled);
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}
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void PiecesList::startDrag(Qt::DropActions /*supportedActions*/)
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{
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QListWidgetItem *item = currentItem();
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QByteArray itemData;
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QDataStream dataStream(&itemData, QIODevice::WriteOnly);
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QPixmap pixmap = qvariant_cast<QPixmap>(item->data(Qt::UserRole));
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QPoint location = item->data(Qt::UserRole+1).toPoint();
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dataStream << pixmap << location;
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QMimeData *mimeData = new QMimeData;
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mimeData->setData(PiecesList::puzzleMimeType(), itemData);
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QDrag *drag = new QDrag(this);
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drag->setMimeData(mimeData);
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drag->setHotSpot(QPoint(pixmap.width()/2, pixmap.height()/2));
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drag->setPixmap(pixmap);
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if (drag->exec(Qt::MoveAction) == Qt::MoveAction)
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delete takeItem(row(item));
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}
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