Change background color of a Qlayout containing QButtons

user_5976895 0
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I have this Qt code:

QHBoxLayout *taggerBox = new QHBoxLayout;
falseBtn = new QToolButton;
falseBtn->setText(tr("False"));
voidBtn = new QToolButton;
voidBtn->setText(tr("Void"));
taggerBox->addWidget(falseBtn);
taggerBox->addWidget(voidBtn);

I would like to change the background of the QHBoxLayout (NOT the background of each button). I didn't find any way to change the background color of a QLayout.

How can I do this ?

Thanks!

qt5 qt c++
3 Answers

QLayout is not a visual element, it's a container that adjust location of contained widgets. You can change background of QFrame or other widgets you included QLayout into.

user_27427170

Since QHBoxLayout is not a QWidget it hasn't its own appearance. So you can't change its color.

user_68530900

You'll have to add an intervening widget that you set the layout on, and change that widget's background. E.g.

auto *taggerBox = new QWidget;
auto *layout = new QHBoxLayout(taggerbox);
falseBtn = new QToolButton(tr("False"));
voidBtn = new QToolButton(tr("Void"));
layout->addWidget(falseBtn);
layout->addWidget(voidBtn);
auto palette = taggerBox->palette();
palette.setColor(QPalette::Window, Qt::blue);
taggerBox->setPalette(palette);

If you're doing this in the constructor of some class, then likely the objects have the same lifetime as the class as there's no point to dynamically allocate them. In such circumstances, the widgets and layouts should be class members instead:

class MyClass : ... {
  QWidget taggerBox;
  QHBoxLayout taggerLayout{&taggerBox};
  QToolButton falseBtn{tr("False")};
  QToolButton voidBtn{tr("Void")};
public:
  MyClass(...);
};

MyClass::MyClass(...) : ... {
    taggerLayout.addWidget(&falseBtn);
    taggerLayout.addWidget(&voidBtn);
    auto palette = taggerBox.palette();
    palette.setColor(QPalette::Window, Qt::blue);
    taggerBox.setPalette(palette);
    ...
}
user_13296520
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