cannot change the QWidget background image.

[qtpi]

Hey fellas, I've tried to change the background image of a QWidget, so I simply subclass-ed QWidget, and call this->setStyleSheet("QWidget {background-image: url(c:/mybackground.png) }"); in the initializaiton function. it seems nothing has happened.

But then I found out accidentally that if I deleted the declaration of Macro Q_OBJECT in the declaration of the class, the background will be actually replaced by the desired image. But I need this Macro in a normal QApplication.

how could it happen? is there any possibility to change the background image via the "this pointer"?

thnx in advance!

[mrjj]

hi
You dont need to subclass QWidget to set stylesheet
ui->somewidget->setStyleSheet will do 100% the same
as
this->setStyleSheet inside a subclass.

What is wrong is most likely the path "c:/"
You are pointing to c:. not sure it will load it.
Normally you would add a qresource file
using
New->Qt->Qt resource file
To that new file via right click and Add existing file you add your bg image.
then syntax is then
background-image: url(:/bg.png);
( with rest as is.) notice the ":/"

please see this sample
https://www.dropbox.com/s/d06k4tpmwgapajc/bg.zip?dl=0

right click the widget to see the stylesheet. There is menu when in
Designer.

[qtpi]

@mrjj hey, thnx for the reply. not familiar with qt designer though, i'll have a look.

[mrjj]

@qtpi
Well I hope your version have the StyleSheet editor. very handy for
crafting stylesheets and see the effect at once.

[qtpi]

@mrjj said:

hi I tried to add qt source file. oddly enough the same thing happened, once I deleted the Q_OBJECT Macro, the background will be set correctly, if this Macro is declared the background will not be changed.

I'll try the qt designer afterwards. I'll give a feed back afterwards.

[mrjj]

@qtpi said:

Q_OBJECT

You will most likely want this so i hope the qrc works for you.