//main.cpp



#include <QGuiApplication>
#include <QtQml>
#include <drop.hpp>

using namespace Qt;

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
    qmlRegisterType<Drop>("areaOfDrop", 1, 0, "AreaOfDrop");
    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    return app.exec();
}

//drop.hpp




#pragma once

#include <QtWidgets>

class Drop :public QLabel {
    Q_OBJECT
    Q_PROPERTY(QString style WRITE setStyle)
public:
    Drop(Drop* pp = nullptr);
    void setStyle(QString data);
protected:
    virtual void dragEnterEvent(QDragEnterEvent* pe) override;
    virtual void dropEvent(QDropEvent* pe) override;
};

//drop.cpp



#include "drop.hpp"

using namespace Qt;

Drop::Drop(Drop* pp) :QLabel(pp)
{
    setAcceptDrops(true);
}

void Drop::setStyle(QString data) {
    this->setStyleSheet(data);
}

void Drop::dragEnterEvent(QDragEnterEvent* pe) {
    if(pe->mimeData()->hasFormat("text/*")) {
        pe->acceptProposedAction();
    }
}

void Drop::dropEvent(QDropEvent* pe) {
    QList<QUrl> urlList = pe->mimeData()->urls();
    foreach(QUrl url, urlList) {
        QFile file(url.toString());
        QByteArray data = file.readAll();
    }
}