Hi,

Please provide the following information:

Qt kit you are using. Qt Creator version. OS, and if Linux, what desktop environment?

I tested that stylesheet on Fedora KDE spin, using Qt 5.15.2/6.2.4/6.6.1, Qt Creator 12, and this MRE:

int main(int argc, char *argv[]) { QApplication a(argc, argv); QTabWidget t; t.setStyleSheet(R"(QTabWidget::pane { border: 3px solid rgb(68, 76, 94); } /*======TAB*========*/ QTabBar::tab { /*color: rgb(68, 76, 94);*/ border: 2px solid rgb(68, 76, 94); } QTabWidget::tab-bar:top { top: 3px; } QTabWidget::tab-bar:bottom { bottom: 2px; } QTabWidget::tab-bar:left { right: 2px; } QTabWidget::tab-bar:right { left: 2px; } QTabBar::tab:left:last, QTabBar::tab:right:last, QTabBar::tab:left:only-one, QTabBar::tab:right:only-one { margin-bottom: 0px; } QTabBar::tab:first { border-top-left-radius: 10px; border-top-right-radius: 10px; } QTabBar::tab:last { border-top-left-radius: 10px; border-top-right-radius: 10px; } QTabBar::tab:middle { border-top-left-radius: 10px; border-top-right-radius: 10px; } QTabBar::tab:top, QTabBar::tab:bottom { min-width: 8ex; margin-right: -1px; padding: 5px 10px 5px 10px; } QTabBar::tab:top:last, QTabBar::tab:bottom:last, QTabBar::tab:top:only-one, QTabBar::tab:bottom:only-one { margin-right: 0; } QTabBar::tab:left, QTabBar::tab:right { min-height: 8ex; margin-bottom: -1px; padding: 10px 5px 10px 5px; } /*TAB:SELECTED*/ QTabBar::tab:selected { background: white; color: rgb(68, 76, 94); border-color: rgb(68, 76, 94); border-bottom-color: transparent; margin-top: 0; } QTabBar::tab:top:selected { border-bottom-color: none; } QTabBar::tab:bottom:selected { border-top-color: none; } QTabBar::tab:left:selected { border-left-color: none; } QTabBar::tab:right:selected { border-right-color: none; } /*TAB !SELECTED*/ QTabBar::tab:!selected { color: white; background-color: rgb(68, 76, 94); border-color: rgb(68, 76, 94); border-width: 3px; } QTabBar::tab:top:!selected { margin-top: 4px; } QTabBar::tab:bottom:!selected { margin-bottom: 3px; } QTabBar::tab:left:!selected { margin-right: 3px; } QTabBar::tab:right:!selected { margin-left: 3px; })"); t.addTab(new QWidget, "Variable fisicas"); t.addTab(new QWidget, "Variable fisiologicas"); t.addTab(new QWidget, "Unidad de Control de Agua"); t.show(); return a.exec(); }

and I get this:

QTabWidgetStyleSheetIsNormal.gif

Which looks normal.

I also tried it on in Qt Designer, just slapped a QTabWidget on a QMainWindow and applied the stylesheet on it, and got this:

QTabWidgetStyleSheetIsNormalInQtDesigner.gif

I also tried to apply the stylesheet on the main window, and the QApplication just to be sure, but same result.

The size of the CheckBox is on controlled by the style/theme. See: https://doc.qt.io/qt-6/qtquickcontrols2-styles.html

@Dariusz said in QtCreator - some basics questions...:

maybe how to change initial type of file from QWidget to QDialog/etc/etc?

If you mean how to change the .h, cpp and UI file to be other type ?

You will have to change in 3 places

.h

class MainWindow : public QMainWindow <<< change here

.cpp
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent) <<<< change here to new type

.ui
This you have to do outside creator, and its best if you close it.
Open the ui file in other editor. ( its text)
alt text

@Bonnie said in UI Stretch with QtCreator:

Because the three layout widgets are not added to any layout. They are child widgets of centralWidget, but they are not added to its layout.
A widget will only be resized and moved to fit the window when it is added to a layout whose parent widget is either the window or also added to an layout whose.....

Thanks for help me, that works