Need to know how many pixels are from top-left to the first character showed at QText

[tonnot]

I think that there is some pixels from the left-top of the QTextEdit to the left-top of the first character showed at QTextEdit.
I dont find how to get it... In addition I apply a style with 0 px for margin, padding and border but I see the same.
Any idea ? Thanks

[tonnot]

SOLVED :
->document->documentmargin() .......