A bug when show menu and then moving fast the widget?

AA130

the code is very easy:
1.right click show the menu
2.left click move the widget

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {class MainWindow;}

class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = 0);
    void contextMenuEvent(QContextMenuEvent *);
    ~MainWindow();
protected:
    virtual void mousePressEvent(QMouseEvent *event);
    virtual void mouseMoveEvent(QMouseEvent *event);
    virtual void mouseReleaseEvent(QMouseEvent *event);
private:
    Ui::MainWindow *ui;
    bool		mMoveing;
    QPoint	    mMovePosition;
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtGui/QMouseEvent>
#include <QMenu>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    resize(100,100);
}

void MainWindow::contextMenuEvent(QContextMenuEvent *e)
{
    QMenu *m =new  QMenu(this);
    m->addAction("item1");

    m->exec(e->globalPos());
}

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

void MainWindow::mousePressEvent(QMouseEvent *event)
{
    mMoveing = true;
    mMovePosition = event->globalPos() - pos();
    return QWidget::mousePressEvent(event);
}


void MainWindow::mouseMoveEvent(QMouseEvent *event)
{
    if (mMoveing && (event->buttons() && Qt::LeftButton))
    {
        move(event->globalPos()-mMovePosition);
        mMovePosition = event->globalPos() - pos();
    }
    return QWidget::mouseMoveEvent(event);
}
void MainWindow::mouseReleaseEvent(QMouseEvent *event)
{
    mMoveing = false;
}

but, when I show the menu and then moving the widget fast, the widget would not follow the mouse
like this:

however, if no right click, its OK

what problem here is? the problem same show in pyqt too

SGaist

Hi and welcome to devnet,

What version of Qt ?
On what platform ?

AA130

This post is deleted!

AA130

@SGaist Win7 64 and QT 5.10.1/pyqt 5.11.2