QComboBox width would changed when it setstylesheet

[Hanson]

When i do not setstylesheet to the widget the qcombobox looks ok.like this.

This is the designer picture.

The code:

QtGuiApplication::QtGuiApplication(QWidget *parent)
	: QWidget(parent)
{
	ui.setupUi(this);

    ui.comboBox->addItem("xxxxxxxxxxxxxxxxxxxxxyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy");
    ui.comboBox->setCurrentIndex(-1);
}

But if I setstylesheet, it will change.

QtGuiApplication::QtGuiApplication(QWidget *parent)
	: QWidget(parent)
{
	ui.setupUi(this);

    ui.comboBox->addItem("xxxxxxxxxxxxxxxxxxxxxyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy");
    ui.comboBox->setCurrentIndex(-1);
    setStyleSheet("QPushButton {background-color:black;}");
}

The qcombobox width change to fit the item text width.
The Qt version I used is 5.9.7.
Any help is apprecitate！

[Abderrahmene_Rayene]

Hi,

Try QComboBox::AdjustToMinimumContentsLengthWithIcon, because the default value is AdjustToContentsOnFirstShow, so the combo box stretching that way, is expected.

You can do that using code, or through Qt Designer:

[JoeCFD]

@Hanson It may trigger adjustSize() call. Try to set fixed size to ui.comboBox if its size is known. And 5.9.7 is too old.

[SimonSchroeder]

QComboBox has a SizeAdjustPolicy. But, I haven't found any value for this policy I would expect to help.

In this very specific case you might want to set the style sheet only on the push button: ui.pushButton->setStyleSheet("background-color:black;");. It doesn't help, though, if you plan on adjusting more things globally with a stylesheet.

[Abderrahmene_Rayene]

Hi,

Try QComboBox::AdjustToMinimumContentsLengthWithIcon, because the default value is AdjustToContentsOnFirstShow, so the combo box stretching that way, is expected.

You can do that using code, or through Qt Designer:

[Hanson]

@SimonSchroeder Hi, this example is used to simulate my actual usage scenario.

[Hanson]

@Abderrahmene_Rayene Oh!!!!It works!!!Thank you so much!!!