Please check the pictures I attached to this post.
I added 4 grid layouts to Form. I did grid lay out and I got 4 squares.
Then I added three push button widgets - up to here everything is fine(PIC 1) but when I added itemlistwidget(PIC 2), the whole thing broke up as you can see. Itemlistwidget would take most of the screen. Now my question is how to fix the ratios in Qt designer to have each widget the size for which grid layout was prepared. Thanks.
I think that situation happened because four widgets' sizePolices were different.
Default sizePolicy of pushButton : h - Minimum, v - Fixed
Default sizePolicy of listWidget : h - Expending, v - Expending
read about sizePolicy detail : http://doc.qt.io/qt-5/qsizepolicy.html
When I have to make fix ratio, use empty widget with same default size Polices