maximizing own widget on parent

[masoroso]

Hi all,

I've made a class based on QWidget and it needs another QWidget as parent.

Map::Map( QWidget *parent ) : QWidget(parent)

Map::Map( QWidget *parent ) : QWidget(parent)

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Now I designed a window in QtDesigner and I subclassed the ui code and on a frame that I placed using QtDesigner the map is placed:

map = new Map(ui.frameMain);

map = new Map(ui.frameMain);

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Next step would be to draw on the map using the paint event. However.. if I draw a line from the topleft to bottomright corner of the map it only takes up a small part of the parent (the frame).

How can I make the map always use the available space of the frame?

Thanks in advance!
Rob

ps. I tried setSizePolicy(QSizePolicy::Expanding,QSizePolicy:: Expanding); in the constructor but that didn't work