如何在Qt（Windows XP）中禁用禁用QScrollbar上下文菜单

Question

I have a Qt application running on a windows XP machine and i am trying to finally disable the context menu which pops up when right clicking on a scroll bar (with the "scroll down" and "page up" etc. .. ) inside this application.

I tried the following things, which didn't work:

ui->scrollArea->setContextMenuPolicy(Qt::NoContextMenu);
ui->scrollAreaWidgetContents->setContextMenuPolicy(Qt::NoContextMenu);            
ui->scrollArea->horizontalScrollBar()->setContextMenuPolicy(Qt::NoContextMenu);

ui->scrollArea->setContextMenuPolicy(Qt::PreventContextMenu);
ui->scrollAreaWidgetContents->setContextMenuPolicy(Qt::PreventContextMenu);       
ui->scrollArea->horizontalScrollBar()->setContextMenuPolicy(Qt::PreventContextMenu);

Answer 1

I never found out why it didn't really worked in my context (it seems it has to do with nested widgets and objects) but I found a solution which is something like a sledge-hammer method but works for me:

foreach(QObject *widget, qApp->allWidgets())
{
    QScrollBar *scrollBar = dynamic_cast<QScrollBar*>(widget);
    if(scrollBar)
    {
        scrollBar->setContextMenuPolicy(Qt::NoContextMenu);
    }
}

This disables context menus of scrollbars (or other objects if modified) in the whole application once at startup.