set background image filled all elements in my QWidget?

[qtpi]

folks, I have built a QWidget, which contains several QLabels and smaller re-painted QWidget.
I wanted to change the background-image of the big QWidget with setStyleSheet, which results in change of all elements background image...
I mean every QLabel and QWidget will be filled with its own background image(the image I've introduced in). how could this happen? is there is a way just fill the big QWidget background without changing the rest?

[the_]

@qtpi

As QLabel is also a QWidget it will get all stylesheets that apply to QWidget.

One way is to access the QWidget by its name

//cpp file
QWidget *bigwidget;
bigwidget->setObjectName("yourbigwidget");

//css file
#yourbigwidget {background-image: url(path/to/background-image); }

Another way could be by a given property

//cpp file
QWidget *bigwidget;
bigwidget->setProperty("fill","1");

//css file
QWidget[fill="1"] {background-image: url(path/to/background-image); }

See also
https://wiki.qt.io/Dynamic_Properties_and_Stylesheets

[qtpi]

@the_ it worked! thanks a lot!

[Ni.Sumi]

@qtpi
I have the sample code as @the_ said, if you want you van have look on it. downlaod it here

I have changed the SetObjectName in cppfile. you can do the same .ui form->rightclcik->changeObjectname.
Then I wrote all css's in the "setstylesheet". Go to "widget.ui" , right click on it and go "ChangeStyleSheet".

edit: you have already made it. Sorry, I commented in the same time.

[qtpi]

@Ni.Sumi lmao. thanks anyway.