[Qt-interest] How to remove the space around the edge of widget when using QGridLayout?

[Kermit Mei]

Hello,community!

I use QGridLayout to show some widgets in mywidget which inherited from
QWidget. And the other widgets are not mywidget's children.

I use QGridLayout in mywidget to show the others. But, there's always
some space around the edge of mywidget. I hope there's no space, between
the different widgets showed on mywidget, and also no space around the
edge of mywidget. 

How to do it? 

Thanks!
Kermit