qt QEvent

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Вот пример кода

Widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private:
    Ui::Widget *ui;

    // QWidget interface
protected:
    void mousePressEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *event);
};

#endif // WIDGET_H

Widget.cpp

#include "Widget.h"
#include "ui_Widget.h"

#include <QApplication>
#include <QDebug>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
}

Widget::~Widget()
{
    delete ui;
}

void Widget::mousePressEvent(QMouseEvent *event)
{
    switch (QApplication::keyboardModifiers())
    {
        case Qt::KeyboardModifier::ShiftModifier:
        {
            qDebug() << "Mouse press event with Shift";
            break;
        }
        case Qt::KeyboardModifier::ControlModifier:
        {
            qDebug() << "Mouse press event with Ctrl";
            break;
        }
        case Qt::KeyboardModifier::AltModifier:
        {
            qDebug() << "Mouse press event with Alt";
            break;
        }
        default:
            qDebug() << "Without modifier";
    }
}

void Widget::mouseReleaseEvent(QMouseEvent *event)
{
    switch (QApplication::keyboardModifiers())
    {
        case Qt::KeyboardModifier::ShiftModifier:
        {
            qDebug() << "Mouse release event with Shift";
            break;
        }
        case Qt::KeyboardModifier::ControlModifier:
        {
            qDebug() << "Mouse press event with Ctrl";
            break;
        }
        case Qt::KeyboardModifier::AltModifier:
        {
            qDebug() << "Mouse press event with Alt";
            break;
        }
        default:
            qDebug() << "Without modifier";
    }
}

Вывод qDebug

Without modifier
Without modifier
Mouse press event with Ctrl
Mouse press event with Ctrl
Mouse press event with Ctrl
Mouse release event with Shift
Without modifier
Mouse press event with Alt
Mouse press event with Shift
Mouse release event with Shift
Without modifier
Without modifier

Спасибо.Это то самое-что надо.