Change colors in menuBar()

PythonQTMarlem

Hello,
pyqt6. I simulate the high contrast:

def set_style(self, font_size=None, high_contrast=False):
    """
    This method allows customizing the application style (e.g. font size, high contrast).
    :param font_size: The font size.
    :param high_contrast: A flag to enable high contrast mode.
    """


    style = ''

    if font_size:
        style += f'font-size: {font_size}px;'

    if high_contrast:
        style += 'background-color: black; color: white;'
        # Add a white border to the QPushButton elements
        style += 'border: 2px solid white;'


    self.current_stylesheet = style
    self.setStyleSheet(style)

I would like to change the colors of a selected menu entry in high contrast:

self.menu_bar = self.menuBar()

# Main menu item "Program" with submenus
self.program_menu = self.menu_bar.addMenu("Program")

# “Execute command” submenu
self.run_action = self.program_menu.addAction("Execute command")
self.run_action.triggered.connect(self.execute_command)
self.run_action.setShortcut("F2")
self.run_action.setStatusTip("Execute command")

Ask:
Is that possible?

jsulm

@PythonQTMarlem Take a look at https://doc.qt.io/qt-6/stylesheet-examples.html
"Customizing QMenuBar"

PythonQTMarlem

Thank you,

PythonQTMarlem

I need help.
I tried:

    def set_style(self, font_size=None, high_contrast=False):
        style = ''

        if font_size:
            style += f'font-size: {font_size}px;'

        if high_contrast:
            # Füge das allgemeine Styling für den Hochkontrastmodus hinzu
            style += """
            QMenu {
                background-color: white;
                margin: 2px; /* some spacing around the menu */
            }

            QMenu::item {
                padding: 2px 25px 2px 20px;
                border: 1px solid transparent; /* reserve space for selection border */
            }

            QMenu::item:selected {
                border-color: darkblue;
                background: rgba(100, 100, 100, 150);
            }
            """

        # Anwendungs-Styling
        style += """
        QMainWindow {
            background-color: black; /* Hintergrundfarbe der Anwendung */
        }

        QMainWindow QLabel {
            color: white; /* Schriftfarbe der Anwendung */
        }

        QPushButton {
            background-color: yellow;
            color: black;
            border: 2px solid white;
        }
        """

        print(style)
        self.current_stylesheet = style
        self.setStyleSheet(style)

The entire CSS code is not implemented. I don't see any changes in my pyqt6 application. Question: what am I doing wrong?

jsulm

@PythonQTMarlem Start with a minimum style sheet and add one piece at a time until it stops working, then you know which part is wrong.

PythonQTMarlem

okay! thank you very much!

PythonQTMarlem

I'm confused.
this works:

style += "background-color: black; color: white;"

this works not:

style += "QMainWindow {background-color: black; color: white;}"

what is wrong?

jsulm

@PythonQTMarlem said in Change colors in menuBar():

QMainWindow

Are you applying this on a QMainWindow instance?

JonB

@PythonQTMarlem
When you show you do self.setStyleSheet(style), what widget is self?

QMainWindow only applies to a QMainWindow. Are you expecting it to apply to a menubar?

PythonQTMarlem

this code:

        if high_contrast:
            style += " QMainWindow {background-color: black; color: white;}"
            print(style)
            self.main_window.setStyleSheet(style)

output print: font-size: 30px; QMainWindow {background-color: black; color: white;}

but this works:

        if high_contrast:
            style = " QMainWindow {background-color: black; color: white;}"
            print(style)
            self.main_window.setStyleSheet(style)

output print:
QMainWindow {background-color: black; color: white;}

the problem just appears with += . (style += )