StyleSheet in QT with QTCreator

[maurelio79]

Hi guys, i'm very, very, newbie in QT e C++ :p

I'm lerning changing some example in QTCreator; now i'm working on Imageviewer example.

I'd like to change some style, but i'm not able to apply StyleSheet, for example i write in imageviewer.cpp



QMenu { color : #ff0000 }


but i got an error:


/home/maurelio/pgm/qt-sdk/qt/examples/widgets/imageviewer/imageviewer.cpp:49: error: expected unqualified-id before ‘{’ token

but i red, for example here
http://doc.trolltech.com/4.3/stylesheet-syntax.html#style-rules
that the syntax is correct.

Can someone help me?
Thanks very much

[PaceyIV]

See http://doc.trolltech.com/4.3/stylesheet-examples.html

[maurelio79]

Oh Great!
Thanks very much!

I'm reading.
Now i'm able to apply a style to a single menu, for example:



void ImageViewer::createMenus()
//! [19] //! [20]
{
fileMenu = new QMenu(tr("&File"), this);
fileMenu->setStyleSheet("color : #ff0000; background-color : #0000ff");
fileMenu->addAction(openAct);
fileMenu->addAction(printAct);
fileMenu->addSeparator();
fileMenu->addAction(exitAct);

viewMenu = new QMenu(tr("&View"), this);
viewMenu->addAction(zoomInAct);
viewMenu->addAction(zoomOutAct);
viewMenu->addAction(normalSizeAct);
viewMenu->addSeparator();
}


Now i have to understand, how to apply the style to entire menu.
A question:
Why in a lot of example i read something like:



QPushButton { color: red }

also in QTCreator help??

In the link that you give me, i don't understand where put code like this:



QTextEdit, QListView {
background-color: white;
background-image: url(draft.png);
background-attachment: scroll;
}


in the *.cpp? Is it possible create a one file with all style (like css), so i don't need to look for style in all files?

[PaceyIV]

You have to create a stylesheet for all your application and use it.

Look at the Style Sheet Example in the qt dir (qt/examples/widgets/stylesheet)

You define all your style sheet and then apply this to your application with the command



qApp->setStyleSheet(styleSheet);


where styleSheet is a QString.

A stylesheet is like a CSS for an HTML page.

[nix]

Hi,

QTextEdit, QListView {
background-color: white;
background-image: url(draft.png);
background-attachment: scroll;
}
Looks as code to put in qtDesigner.
You can use stylesheet directly into the ui designer (right click on the dialog and choose "change stylesheet").
Using this method allow you to see the aspect of your ui without compile anything (a preview will show you the exact look of yours widgets in any style).

[maurelio79]

So, if i want to use StyleSheet, i need to use as well .ui file?
For example, just to learn i'm making a window with some QLabel, QLineEdit, QStatusBar (just to know elemnts), but i don't have a .ui file, i have:

- main.cpp
- MainWindow.cpp
- MainWIndow.h
- MainWindow.pro

i put elements on main window with code:
example:



firstStatusBar->setGeometry(0, 620, 480, 10);


So to use StyleSheet, i have to use .ui?

Thanks very much for helping me.

[profoX]

No, you don't have to use .ui files.
You can just use the setStyleSheet(QString) syntax in your C++ code.