How to set margin of content of QScrollArea

Niagarer

Hi,
I am struggling to set the margin of the widgets inside a QScrollArea.
This is what I tried:

class NodeWidget(QWidget):
    def __init__(self):
        super(NodeWidget, self).__init__()

        # UI
        main_layout = QGridLayout()

        name_label = QLabel('label 1')
        name_label.setFont(QFont('Poppins', 12))
        package_name_label = QLabel('label 1')
        package_name_label.setFont(QFont('Poppins', 12))

        main_layout.addWidget(name_label, 0, 0)
        main_layout.addWidget(package_name_label, 1, 0)

        self.setLayout(main_layout)


        main_layout.setVerticalSpacing(0)
        main_layout.setSpacing(0)
        self.setContentsMargins(-6, -6, -6, -6)
        main_layout.setContentsMargins(-6, -6, -6, -6)

        self.setStyleSheet('margin: 0px;')  # doen't work


class MyWidget(QScrollArea):
    def __init__(self):
        super(MyWidget, self).__init__()
        self.setWidgetResizable(True)
        self.list_scroll_area_widget = QWidget()
        self.setWidget(self.list_scroll_area_widget)

        self.list_layout = QVBoxLayout()
        self.list_layout.setAlignment(Qt.AlignTop)
        self.list_scroll_area_widget.setLayout(self.list_layout)


        nw1 = NodeWidget()
        self.list_layout.addWidget(nw1)
        nw2 = NodeWidget()
        self.list_layout.addWidget(nw2)

        self.setStyleSheet('background-color: #5555aa; border: 1px solid grey;')

        self.setContentsMargins(0, 0, 0, 0)  # doesn't work either

Result:
Qt 58.png
I actually want the space between the label boxes and the border of the scroll area to be smaller.
How can i do this?
Thanks for answers!

mrjj

@Niagarer said in How to set margin of content of QScrollArea:

self.setContentsMargins(0, 0, 0, 0) # doesn't work either

Hi
It has to be on the inner most layout that holds the widgets.

Niagarer

@mrjj Hi,
thank you, that was an improvement.
I now call

        self.list_layout.setContentsMargins(0, 0, 0, 0)

too.
Qt 59.png
But still there is some space I don't get rid of.
Setting spacing of the list_layout to 0 also has no effect on the space between the two boxes...

mrjj

@Niagarer
hi
I think we still have some ContentsMargins on one of the layouts
It does look like the default size. on left / right side.

The space between the two boxes might be normal as it just how the layout divide the space
even if spacing is set to zero , it will do like this unless you insert a spacer to press them upwards.

Niagarer

@mrjj
Also thought about that but adding a spacer as third item to main_layout has no effect at all on the space between them.
So it seems like it's just the margin of these NodeWidgets although their margins actually should be 0

mrjj

@Niagarer
Im not really sure where space comes from
but its possible to have ScrollArea margin/borderless

alt text

So maybe it does come from the NodeWidgets for some reason
but you should be able to get rid of it.

Niagarer

@mrjj
Ok. Strange, but thanks for the input I will see if I find what's missing

Niagarer

Thank you, you are right, I made a mistake:
I applied negative content margins on a layout which seems to result in positive minus border:

Qt 61.png
left: main_layout.setContentsMargins(6, 6, 6, 6)
right: main_layout.setContentsMargins(-6, -6, -6, -6)
I actually could have seen this in @mrjj's post... my bad

So, all I needed to do is to call

layout.setSpacing(0)
layout.setContentMargins(0, 0, 0, 0)

on every layout in the extreme case.

Qt 62.png

I still haven't found a way to do all this through a stylesheet for the scrollarea though but at least this is one way of doing it.