DragAndDropHandler.h

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/*-
 * Copyright (c) 2022-23 Simon Peter <probono@puredarwin.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */
 
#ifndef DRAGANDDROPHANDLER_H
#define DRAGANDDROPHANDLER_H
 
#include <QObject>
#include <QAbstractItemView>
#include <QTimer>
 
// This is a friend class of QAbstractItemView
class QAbstractItemView;
 
class DragAndDropHandler : public QObject {
Q_OBJECT
public:
    explicit DragAndDropHandler(QAbstractItemView *view, QObject *parent = nullptr);
 
public slots:
    void handleDragEnterEvent(QDragEnterEvent* event);
 
    void handleDragMoveEvent(QDragMoveEvent* event);
 
    void handleDropEvent(QDropEvent* event);
 
    void handleDragLeaveEvent(QDragLeaveEvent *event);
 
private slots:
    void mouseHoversOver();
 
private:
    QAbstractItemView *m_view;
 
    // For spring-loaded folders
    QTimer m_springTimer;
    QModelIndex m_potentialTargetIndex;
 
    void showDropMenu(QDropEvent *event, QList<QUrl> &urls, const QString &targetPath) const;
};
 
#endif // DRAGANDDROPHANDLER_H