FileDropFrame.h

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#pragma once
#include <QFrame>
#include <QMimeData>
#include <QDragEnterEvent>
#include <QDropEvent>
namespace NDEVR
{
    /**--------------------------------------------------------------------------------------------------
    \brief A simple frame that allows the user to drag and drop a file into it.
    **/
    class FileDropFrame : public QFrame
    {
    public:
        FileDropFrame(QWidget* parent = nullptr)
            : QFrame(parent)
        {
            setAcceptDrops(true);
        }
        void dragEnterEvent(QDragEnterEvent* event)
        {
            if(m_drop_filter == nullptr)
                event->acceptProposedAction();
            else if (m_drop_filter(event->mimeData()))
                event->acceptProposedAction();
        }
        void dropEvent(QDropEvent* event)
        {
            if (m_drop_callback)
                m_drop_callback(event);
        }
        void setDropCallback(const std::function<void(QDropEvent* event)>& drop_callback)
        {
            m_drop_callback = drop_callback;
        }
        void setDropFilter(std::function<bool(const QMimeData* event)> filter)
        {
            m_drop_filter = filter;
        }
    protected:
        std::function<void(QDropEvent* event)> m_drop_callback;
        std::function<bool(const QMimeData* event)> m_drop_filter;
    };
}