How to set Font for widgets in the parent from a child widget

[ramsailesh]

Dear all,

I've a mainwindow M with some widgets L and a Custom-dropdown D which contains list of Fonts.
I need to set font for all the widgets in M if dropdown D is changed.
I tried to set the font which resulted in Segmentation fault.

void UpdateFont()
{
    QObject *obj = this->parent();
    QObjectList objlistChildren = obj->children();
    int iCount = objlistChildren.count();
 
    for(int iIndex = 0; iIndex < iCount; iIndex++)
    {
        QObject *temp = objlistChildren[iIndex];
        ( (QWidget*)objlistChildren[iIndex] )->setFont(font);
    }
}

void UpdateFont()
{
    QObject *obj = this->parent();
    QObjectList objlistChildren = obj->children();
    int iCount = objlistChildren.count();

    for(int iIndex = 0; iIndex < iCount; iIndex++)
    {
        QObject *temp = objlistChildren[iIndex];
        ( (QWidget*)objlistChildren[iIndex] )->setFont(font);
    }
}

To copy to clipboard, switch view to plain text mode 

How can i access the parent widgets and set its font from the child control.

Thanks in advance for your suggestions.