QLabel set color of text and background

Question

How do I set color of text and background of a QLabel

User · Answer

I add this answer because I think it could be useful to anybody.

I step into the problem of setting RGBA colors (that is, RGB color with an Alpha value for transparency) for color display labels in my painting application.

As I came across the first answer, I was unable to set an RGBA color. I have also tried things like:

myLabel.setStyleSheet("QLabel { background-color : %s"%color.name())

where color is an RGBA color.

So, my dirty solution was to extend QLabel and override paintEvent() method filling its bounding rect.

Today, I've open up the qt-assistant and read the style reference properties list. Affortunately, it has an example that states the following:

QLineEdit { background-color: rgb(255, 0, 0) }

Thats open up my mind in doing something like the code below, as an example:

myLabel= QLabel()
myLabel.setAutoFillBackground(True) # This is important!!
color  = QtGui.QColor(233, 10, 150)
alpha  = 140
values = "{r}, {g}, {b}, {a}".format(r = color.red(),
                                     g = color.green(),
                                     b = color.blue(),
                                     a = alpha
                                     )
myLabel.setStyleSheet("QLabel { background-color: rgba("+values+"); }")

Note that setAutoFillBackground() set in False will not make it work.

Regards,

User · Answer

The best way to set any feature regarding the colors of any widget is to use QPalette    And the easiest way to find what you are looking for is to open Qt Designer and set the palette of a QLabel and check the generated code

User · Answer

You can use QPalette  however you must set setAutoFillBackground true   to enable background color  QPalette sample palette  sample palette setColor QPalette  Window  Qt  white   sample palette setColor QPalette  WindowText  Qt  blue    sample label- gt setAutoFillBackground true   sample label- gt setPalette sample palette   sample label- gt setText  What ever text      It works fine on Windows and Ubuntu  I haven t played with any other OS   Note  Please see QPalette  color role section for more details

User · Answer

The ONLY thing that worked for me was html    And I found it to be the far easier to do than any of the programmatic approaches   The following code changes the text color based on a parameter passed by a caller    enum  msg info  msg notify  msg alert       void bits  sendMessage QString amp  line  int level        QTextCursor cursor   ui- gt messages- gt textCursor        QString alertHtml      lt font color   DeepPink   gt        QString notifyHtml     lt font color   Lime   gt        QString infoHtml       lt font color   Aqua   gt        QString endHtml        lt  font gt  lt br gt         switch level                case msg alert   line   alertHtml   line  break          case msg notify  line   notifyHtml   line  break          case msg info    line   infoHtml   line  break          default          line   infoHtml   line  break             line   line   endHtml      ui- gt messages- gt insertHtml line       cursor movePosition QTextCursor  End       ui- gt messages- gt setTextCursor cursor

User · Answer

This one is working perfect  QColorDialog  dialog   new QColorDialog this   QColor color   dialog- gt getColor    QVariant variant  color  QString colcode   variant toString    ui- gt label- gt setStyleSheet  QLabel   background-color    colcode     color   blue         getColor   method returns the selected color  You can change label  color using stylesheet

User · Answer

The best and recommended way is to use Qt Style Sheet   To change the text color and background color of a QLabel  here is what I would do    QLabel  pLabel   new QLabel  pLabel- gt setStyleSheet  QLabel   background-color   red  color   blue         You could also avoid using Qt Style Sheets and change the QPalette colors of your QLabel  but you might get different results on different platforms and or styles   As Qt documentation states        Using a QPalette isn t guaranteed to work for all styles  because style authors are restricted by the different platforms  guidelines and by the native theme engine    But you could do something like this     QPalette palette   ui- gt pLabel- gt palette     palette setColor ui- gt pLabel- gt backgroundRole    Qt  yellow    palette setColor ui- gt pLabel- gt foregroundRole    Qt  yellow    ui- gt pLabel- gt setPalette palette     But as I said  I strongly suggest not to use the palette and go for Qt Style Sheet

[qt] QLabel: set color of text and background

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