/*
  This file is part of KDDockWidgets.

  SPDX-FileCopyrightText: 2019-2022 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
  Author: Sérgio Martins <sergio.martins@kdab.com>

  SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only

  Contact KDAB at <info@kdab.com> for commercial licensing options.
*/

#ifndef KD_DROPINDICATOROVERLAYINTERFACE_P_H
#define KD_DROPINDICATOROVERLAYINTERFACE_P_H

#include "kddockwidgets/docks_export.h"
#include "kddockwidgets/QWidgetAdapter.h"
#include "Frame_p.h"
#include "kddockwidgets/KDDockWidgets.h"

namespace KDDockWidgets {

class DropArea;

class DOCKS_EXPORT DropIndicatorOverlayInterface : public QWidgetAdapter
{
    Q_OBJECT
    Q_PROPERTY(QRect hoveredFrameRect READ hoveredFrameRect NOTIFY hoveredFrameRectChanged)
    Q_PROPERTY(KDDockWidgets::DropLocation currentDropLocation READ currentDropLocation NOTIFY currentDropLocationChanged)
public:
    explicit DropIndicatorOverlayInterface(DropArea *dropArea);
    void setHoveredFrame(Frame *);
    void setWindowBeingDragged(bool);
    QRect hoveredFrameRect() const;
    bool isHovered() const;
    DropLocation currentDropLocation() const;
    Frame *hoveredFrame() const
    {
        return m_hoveredFrame;
    }
    void setCurrentDropLocation(DropLocation location);

    KDDockWidgets::DropLocation hover(QPoint globalPos);

    /// Clears and hides drop indicators
    void removeHover();

    /// @brief returns the position of the specified drop location
    /// The return is in global coordinates
    virtual QPoint posForIndicator(DropLocation) const = 0;

    /// @brief Returns whether the specified drop indicator should be visible
    virtual bool dropIndicatorVisible(DropLocation) const;

    static KDDockWidgets::Location multisplitterLocationFor(DropLocation);

Q_SIGNALS:
    void hoveredFrameChanged(KDDockWidgets::Frame *);
    void hoveredFrameRectChanged();
    void currentDropLocationChanged();

private:
    void onFrameDestroyed();
    void setHoveredFrameRect(QRect);
    QRect m_hoveredFrameRect;
    DropLocation m_currentDropLocation = DropLocation_None;

protected:
    virtual DropLocation hover_impl(QPoint globalPos) = 0;
    virtual void onHoveredFrameChanged(Frame *);
    virtual void updateVisibility()
    {
    }

    Frame *m_hoveredFrame = nullptr;
    DropArea *const m_dropArea;
    bool m_draggedWindowIsHovering = false;
};

}

#endif