I thought it would be simple like this
Qt Code: 
  1. void MessageForm::mouseMoveEvent(QMouseEvent *mme)
  2. {
  3.     if(mme->type() == QMouseEvent::MouseMove){
  4.         if(ui->actions->rect().contains(mme->pos())){
  5.             ui->actions->setVisible(true);
  6.         }
  7.         else{
  8.             ui->actions->setVisible(false);
  9.         }
  10.     }
  11. }
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i am not using mouse event of widget with buttons but from parent widget. The first problem was one overlay floating widget and one stretch widget. solved with
Qt Code: 
  1. void MessageForm::resizeEvent(QResizeEvent* re) {
  2.     Q_UNUSED(re);
  3.     ui->actions->move(width() - ui->actions->width() - 20,  20 );
  4.     ui->textEdit->resize(this->size());
  5. }
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in form constructor i have
Qt Code: 
  1. ui->setupUi(this);
  2.     setMouseTracking(true);
  3.     ui->textEdit->move(0,0);
  4.     ui->actions->setVisible(false);
  5.     resizeEvent(NULL);
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but, of course, there is QTextEdit that takes mouse events. It doesnt feel right to reimplement QTextEdit (it is not realy text editing function what am i reimplementing), but it takes away mouse events i intended from form.
So i thought that i just made a blunder, and that i am doing it wrong. Maybe someone here acomplished same thing.
Or, Is there a way for parent widget tho know the mouse position if the mouse is over the widget itself and/or its children widgets?