Setting padding and margin to 0 doesn´t work

Question

It´s just a container and i want to put widgets inside and hide them and show them. I don´t want it to have any margins or paddings, and it will be invisible (no border, no background)

I set the QWidget#container to margin:0px, padding:0px through a stylesheet. And setObjectName("container") to all the widgets that contain.

Nothing happens. But setting a background color works, so it is executed.

In which cases does this happen? How to fix this?

Answer 1

QWidget does not support box model, so it does not understand padding/margin CSS directives. Use QFrame as container. To see which widgets support box model take a look at list of stylable widgets

Answer 2

Given there was no concise answer I'll sum up the above:

To create a container with no margins and padding, instead of QWidget, use QFrame, and set a layout on it. Then set the spacing to 0 and set the content margins to 0 as well on the layout. Using a stylesheet setting padding/margin to 0 will have no effect.

Code:

QFrame* containerFrame = new QFrame();
QVBoxLayout* layout = new QVBoxLayout;
layout->setSpacing(0);
layout->setContentsMargins(0, 0, 0, 0);
// add some widgets to the layout
containerFrame->setLayout(layout);