/* Copyright (C) 2015
 * swift project Community / Contributors
 *
 * This file is part of swift Project. It is subject to the license terms in the LICENSE file found in the top-level
 * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
 * including this file, may be copied, modified, propagated, or distributed except according to the terms
 * contained in the LICENSE file.
 */

#ifndef BLACKGUI_DROPSITE_H
#define BLACKGUI_DROPSITE_H

#include "blackgui/blackguiexport.h"
#include "blackgui/dropbase.h"
#include "blackmisc/variant.h"

#include <QLabel>
#include <QList>
#include <QObject>
#include <QString>

class QDragEnterEvent;
class QDragLeaveEvent;
class QDragMoveEvent;
class QDropEvent;
class QPaintEvent;
class QWidget;

namespace BlackGui
{
    /*!
     * Area where items can be dropped
     * \remark inspired by Qt example: http://doc.qt.io/qt-4.8/qt-draganddrop-dropsite-example.html
     */
    class BLACKGUI_EXPORT CDropSite :
        public QLabel,
        public CDropBase
    {
        Q_OBJECT

    public:
        //! Constructor
        CDropSite(QWidget *parent = nullptr);

        //! Set text for drop site
        void setInfoText(const QString &dropSiteText);

        //! Drop allowed
        void allowDrop(bool allowed) override;

    signals:
        //! Dropped value object
        void droppedValueObject(const BlackMisc::CVariant &droppedObject);

    protected:
        //! \copydoc QWidget::dragEnterEvent
        virtual void dragEnterEvent(QDragEnterEvent *event) override;

        //! \copydoc QWidget::dragMoveEvent
        virtual void dragMoveEvent(QDragMoveEvent *event) override;

        //! \copydoc QWidget::dragLeaveEvent
        virtual void dragLeaveEvent(QDragLeaveEvent *event) override;

        //! \copydoc QWidget::dropEvent
        virtual void dropEvent(QDropEvent *event) override;

    private slots:
        //! Style has been changed
        void ps_onStyleSheetsChanged();

    private:
        //! Clear
        void resetText();

        QString    m_infoText;           //!< text displayed for drop site
        bool       m_allowDrop = true;   //!< dropping allowed?
        QList<int> m_acceptedMetaTypes;  //!< accepted meta types
    };

} // ns

#endif // guard