[SOLVED] How to resize a window to it's minimum when launched?

Leon · wrote on 4 Oct 2012, 13:43

So i have this ui in my designer:

!http://i.imgur.com/mlGg5.png(ui)!

But because as you know Ubuntu menubar of applications doesn't appear in the window of the application but in the panel..
So i am able after the launch of the application to make the window smaller:

!http://i.imgur.com/Xhhb4.png(height)!
!http://i.imgur.com/ypj9j.png(width)!

I would like my window after the launch to be at it's minimum.. one solution i could only think is like say resize (1x1) and because obviously the minimum is bigger than 1x1 it will then resize it to it's minimum.. What do you say?

Leon · wrote on 7 Oct 2012, 10:20

Anyone? :/

marsupial · wrote on 7 Oct 2012, 15:01

You can use QWidget::minimumSizeHint() to receive the minimum size and then set this size manually, but it should come down to the same result as setting a size of 1x1 :)

MuldeR · wrote on 7 Oct 2012, 15:19

Yeah, simple put this code into your constructor after setupUi() or put it into the showEvent():
@resize(this->minimumSize());@

Leon · 10 Jul 2024, 10:39

Thank you

@ resize(this->minimumSize());@

works for me :)

RokeJulianLockhart · 10 Jul 2024, 11:46

@Leon said in [SOLVED] How to resize a window to it's minimum when launched?:

Thank you
@    resize(this->minimumSize());@
works for me :)

Per this Discourse post, I've tried to use that solution in PyQt6 as

self.resize(self.minimumSizeHint())

but it causes

The Wayland connection experienced a fatal error: Protocol error

to appear when the window is resized by the user.

Is there anything special that needs to be done that's missing from this thread, like a specific part of the code it needs to be placed in, for it to work properly?

JonB · 7 Oct 2024, 13:36

@RokeJulianLockhart
There are a lot of restrictions on what you can do to (top-level) windows under Wayland. Try a resize() with some fixed size somewhere and see whether just that works.

RokeJulianLockhart · 8 Feb 2024, 22:14

@JonB, it actually appears that it works on one (example) script:

#!/usr/bin/env -S python3

import sys
from PyQt6.QtWidgets import QApplication, QMainWindow, QPushButton


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setWindowTitle("My App")

        self.button = QPushButton("Press Me!")
        self.button.clicked.connect(self.the_button_was_clicked)

        self.resize(self.minimumSizeHint())

        self.setCentralWidget(self.button)

    def the_button_was_clicked(self):
        self.button.setText("You already clicked me.")
        self.button.setEnabled(False)

        # Also change the window title.
        self.setWindowTitle("My Oneshot App")


app = QApplication(sys.argv)

window = MainWindow()
window.show()

app.exec()

...but not another, (more) complex one:

#!/usr/bin/env -S python3

##### **Description**

"""
This allows management of the brightness of a monitor.

It features multiple methods of interaction, and operates upon Windows and traditional Linux distributions (Fedora and OpenSUSE).
"""

##### **Dependency Importation**

import calendar
import time
from rich.console import Console
from rich.markdown import Markdown
    #**Origin(s)**: [Stack Overflow](https://stackoverflow.com/revisions/76833666/1#:~:text=from%20rich.console%20import%20Console,%20%20%20%20console.print(md))

##### **Metadata Definition**

__LICENSE__:     str =  ["MIT"]
__COPYRIGHT__:   str =  ["Copyright 2024 Roke Julian Lockhart Beedell"]
__STATUS__:      list = ["alpha"]
__VERSION__:     list = ["1720556480"]
__MAINTAINERS__: list = ["[`RokeJulianLockhart`](https://dub.sh/jga)"]
__CREDITS__:     list = ["[`RokeJulianLockhart`](https://dub.sh/jga)"]

if __name__ == "__main__":
    #**Information**: As [this](https://realpython.com/if-name-main-python/#:~:text=What%20Does%20if%20__name__%20==%20%22__main__%22%20Do%20in%20Python?) explains, this prevents invocation as a module, restricting it to run solely as a script.

    import sys
    if sys.version_info[0] != 3 or sys.version_info[1] < 7:
        #**Origin(s)**: [Avoiding `__init__.py` for Initial Imports](https://stackoverflow.com/revisions/6224814/2#:~:text=You%20should%20not%20use%20any,including%20real%20initial%20imports%2C%20here)

        logging.getLogger().debug(
            Console().print(Markdown(
                'This script requires Python version 3.')))
        raise SystemExit(-1)
            #**Information**: [Understanding `sys.exit(n)` in Python](https://stackoverflow.com/revisions/44894090/2#:~:text=The%20call%20sys.exit(n)%20tells%20the,answered)

    #**Task(s)**: convert to `wxwidgets`/`wxpython`?: \
    #1.  [wxWidgets Issue 19352: Migrated from Trac Ticket](https://github.com/wxWidgets/wxWidgets/issues/19352#issue-1100648687:~:text=Issue%20migrated%20from%20trac%20ticket,Thanks%20a%20lot!)
    #1.  [wxWidgets: wxQt Project Information](https://www.wxwidgets.org/about/#:~:text=10%20and%0Aabove.-,wxqt,-%3A%20wxQt%20is%20a)

    ##### **Dependency Importation**

    import platform
    import subprocess
    import logging
    import shutil

    #```py
    #logging.basicConfig(level=logging.DEBUG)
    #    #**Task(s)**: fix [*Placeholder*](https://github.com/Crozzers/screen_brightness_control/discussions/30#discussion-5041474) \.
    #    #**Origin(s)**: [*Placeholder*](https://stackoverflow.com/revisions/41797120/1#:~:text=Try%20this-,logging.basicConfig(level=logging.DEBUG),-answered%20Jan%2022%2C)
    #```

    ##### **Dependency Management**

    def which(package):
        """
        A function that takes a package name as input, tries to import the package, and if it fails, installs the package using pip.

        Parameters:
            package (str): The name of the package to import or install.

        Returns:
            None
        """

        try:
            return __import__(package)
        except ImportError:
            subprocess.check_call([sys.executable, "-m", "pip", "install", package])
                #**Origin(s)**: [Installing Python Packages with `pip` from Script](https://stackoverflow.com/revisions/50255019/2#:~:text=The%20officially%20recommended%20way%20to,subprocess.check_call(%5Bsys.executable%2C%20%22%2Dm%22%2C%20%22pip%22%2C%20%22install%22%2C%20package%5D))

            #**Origin(s): [*Placeholder*](https://stackoverflow.com/revisions/4527622/3#:~:text=package%20=%20'package_name',%20%20%20%20return%20None)
        logging.getLogger().debug(
            Console().print(Markdown(
                package, 'exists.')))

    which(package='screen_brightness_control')
    which(package='PyQt5')
    which(package='rich')

    #```py
    #subprocess.check_call([sys.executable, "-m", "pip", "install", 'PySide6'])  #**Task(s)**: ascertain whether this should be used instead, since it is official. https://www.pythonguis.com/faq/pyqt6-vs-pyside6/#:~:text=PySide2-,PyQt6%20vs%20PySide6,-What's%20the%20difference
    #```

    ##### **Dependency Importation**

    import screen_brightness_control as sbc
    from PyQt5.QtWidgets import QMenu, QMenuBar, QApplication, QMainWindow, QVBoxLayout, QWidget, QSlider, QLineEdit, QPushButton, QTreeWidget, QTreeWidgetItem
        #**Task(s)**: replace with PyQt6.

    from PyQt5 import QtCore
        #**Task(s)**: replace with PyQt6.

    from PyQt5.QtCore import Qt
        #**Task(s)**: replace with PyQt6.

    ##### **Security**

    if platform.system() == 'Linux':

        import getpass
        import grp
        import os

        if getpass.getuser() not in str(
            subprocess.call(["powershell", "".join(
                [os.path.dirname(os.path.realpath(__file__)), ''])])): # <code>../  [-]	`{title: "Configurator",	id: "s3wrcl"}`{.JSON5}.dir/  [-]	`{title: "Code",	id: ""}`{.JSON5}.dir/  [x]	``{title: "`Get-SuperuserUsername`{.PS1}",	id: "settlu"}``{.JSON5}.txt.PS1</code>

            #**Origin(s)**: \
            #1.  [*Placeholder*](https://stackoverflow.com/revisions/842096/4#:~:text=Look%20at%20getpass%20module,May%208%2C%202009%20at%2022:30)
            #1.  [`in`](https://stackoverflow.com/revisions/3437070/7#:~:text=Use%20the%20in%20operator:,Note:%20This%20is%20case%2Dsensitive.)
            #1.  [*Placeholder*](https://stackoverflow.com/revisions/3430395/13#:~:text=The%20special%20variable%20__file__%20contains,does%20the%20__file__%20variable%20mean/do?)
            #1.  [*Placeholder*](https://stackoverflow.com/revisions/40311142/3#:~:text=For%20your%20stated%20scenario%2C%20there,Oct%2028%2C%202016%20at%2018:29)

            logging.getLogger().debug(
                logging.getLogger().debug(
                    Console().print(Markdown(
                        getpass.getuser(), 'is not the superuser.'))))
                #**Task(s)**: Fix concatenation problems: `.debug("Houston, we have a %s", "thorny problem", exc_info=1)` works.

            try:
                grp.getgrnam('i2c')
            except Exception:
                try:
                    subprocess.call(['sudo', 'groupadd', '--system', 'i2c'])
                    grp.getgrnam('i2c')
                except Exception:
                    logging.exception('Unable to create group i2c.')
                    raise SystemExit(-1)
            else:
                logging.getLogger().debug(
                    Console().print(Markdown(
                        'i2c exists.')))

            if not [match for match in grp.getgrnam('i2c').gr_mem if getpass.getuser() in match]:
                #**Information**: [*Placeholder*](https://www.ddcutil.com/i2c_permissions/#:~:text=I2C%20Device%20Permissions-,I2C%20Device%20Permissions,$%20sudo%20chmod%20a+rw%20/dev/i2c%2D*,-Previous) \
                #**Origin(s)**:   [*Placeholder*](https://stackoverflow.com/revisions/15168560/2#:~:text=This%20answer%20builds%20upon%20the,print('Group%20somegrp%20does%20not%20exist.'))

                logging.exception(getpass.getuser(), 'is not part of the i2c group.')
                if subprocess.call(['sudo', 'usermod', getpass.getuser(), '-aG', 'i2c']) != 0:
                    logging.exception('Unable to add user to i2c.')
                    raise SystemExit(-1)
                else:
                    logging.getLogger().debug(
                        Console().print(Markdown(
                            getpass.getuser(), 'added to i2c.')))
            else:
                logging.getLogger().debug(
                    Console().print(Markdown(
                        getpass.getuser(), 'is part of i2c.')))

    import shutil
    ddcutil_available = False
    logging.getLogger().debug(
        Console().print(Markdown(
            '0: ddcutil_available = False')))

    if shutil.which('ddcutil') is None:
        logging.getLogger().error(
            Console().print(Markdown(
                'Code RSJQ4A: the ddcutils binary is unavailable.')))
        ddcutil_available = False
        logging.getLogger().debug(
            Console().print(Markdown(
                '1: ddcutil_available = False')))
    elif os.path.exists(shutil.which('ddcutil')):
        ddcutil_available = True
        logging.getLogger().debug(
            Console().print(Markdown(
                '2: ddcutil_available = True')))
    else:
        ddcutil_available = False
        logging.getLogger().error(
            Console().print(Markdown(
                'Invalid output of shutil. Defaulting to assumption that ddcutil is unavailable.')))
        if (sbc.list_monitors(method='ddcutil') == sbc.list_monitors()) == False:
            logging.getLogger().error(
                Console().print(Markdown(
                    'Code RSJPK5: ddcutils is unable to acquire the list of monitors. Operations may become slow.')))
            ddcutil_available = False
            logging.getLogger().debug(
                Console().print(Markdown(
                    '3: ddcutil_available = False')))
        elif (sbc.list_monitors(method='ddcutil') == sbc.list_monitors()) == True:
            logging.getLogger().debug(
                Console().print(Markdown(
                    '4: ddcutil is available.')))
            ddcutil_available = True
            logging.getLogger().debug(
                Console().print(Markdown(
                    '5: ddcutil_available = True')))
        else:
            logging.exception(
                Console().print(Markdown(
                    'ddcutil_available contains invalid value.')))
            raise Exception(1)

    ##### **GUI**

    class MainWindow(QMainWindow):
        """
        *   The class `MainWindow` inherits from `QMainWindow` and sets up a main window layout with monitor information.
        *   `__init__`: Initializes the main window layout, sets up monitor list, slider, input area, and apply configuration button.
        *   `on_click`: Handles the logic for applying the configuration to every checked monitor in the list.
        """

        def __init__(self, *args, **kwargs):
            """
            Initializes the MainWindow class.

            Args:
                *args: Variable length argument list.
                **kwargs: Arbitrary keyword arguments.

            Returns:
                None
            """

            super(MainWindow, self).__init__(*args, **kwargs)

            layout_1 = QVBoxLayout()
            layout_1.setAlignment(QtCore.Qt.AlignTop)
            widget_1 = QWidget()
            widget_1.setLayout(layout_1)
            self.setCentralWidget(widget_1)

            self.resize(self.minimumSizeHint())

            monitor_list = QTreeWidget()
            layout_1.addWidget(monitor_list)

            #```py
            #monitor_list.setWindowTitle('Monitors')
            #    #**Task(s)**: ascertain what this does.
            #```

            headers = (['Model', 'Brightness'])
            monitor_list.setColumnCount(len(headers))
            monitor_list.setHeaderLabels(headers)

            counter = 0

            if ddcutil_available == True:
                #**Origin(s)**: [*Placeholder*](https://stackoverflow.com/revisions/11269627/7#:~:text=For%20python%20%3E=%203.3%2C%20Redirect,=%20os.system(%22echo%20'foo'%20%26%3E%20/dev/null%22))

                while counter < len(sbc.list_monitors(method='ddcutil')):
                    #**Task(s)**: this doesn't operate with more than 1 monitor attached.

                    rowcount = monitor_list.topLevelItemCount()
                    monitor_list.addTopLevelItem(QTreeWidgetItem(rowcount))
                    monitor_list.topLevelItem(rowcount).setText(rowcount, sbc.list_monitors(method='ddcutil')[counter])
                    if sbc.list_monitors(method='ddcutil')[rowcount] == sbc.list_monitors(method='ddcutil')[0]:
                        monitor_list.topLevelItem(rowcount).setSelected(True)
                            #**Origin(s)**: [*Placeholder*](https://stackoverflow.com/posts/30213421/revisions#:~:text=You%20can%20interact%20with%20the,%7D)

                    else:
                        monitor_list.topLevelItem(rowcount).setSelected(False)
                    monitor_list.topLevelItem(rowcount).setCheckState(rowcount, QtCore.Qt.Unchecked)
                    monitor_list.topLevelItem(rowcount).setFlags(monitor_list.topLevelItem(rowcount).flags() | QtCore.Qt.ItemIsUserCheckable)
                    counter = counter + 1
            if ddcutil_available == False:
                while counter < len(sbc.list_monitors()):
                    #**Task(s)**: this doesn't operate with more than 1 monitor attached.

                    rowcount = monitor_list.topLevelItemCount()
                    monitor_list.addTopLevelItem(QTreeWidgetItem(rowcount))
                    monitor_list.topLevelItem(rowcount).setText(rowcount, sbc.list_monitors()[counter])
                    if sbc.list_monitors()[rowcount] == sbc.list_monitors()[0]:
                        monitor_list.topLevelItem(rowcount).setSelected(True)
                            #**Origin(s)**: [*Placeholder*](https://stackoverflow.com/posts/30213421/revisions#:~:text=You%20can%20interact%20with%20the,%7D)

                        monitor_list.topLevelItem(rowcount).setCheckState(rowcount, QtCore.Qt.Checked)
                    else:
                        monitor_list.topLevelItem(rowcount).setSelected(False)
                        monitor_list.topLevelItem(rowcount).setCheckState(rowcount, QtCore.Qt.Unchecked)
                    monitor_list.topLevelItem(rowcount).setFlags(monitor_list.topLevelItem(rowcount).flags() | QtCore.Qt.ItemIsUserCheckable)
                    counter = counter + 1
                if not platform.system() == 'Windows' and not platform.system() == 'Darwin':
                    logging.getLogger().debug(
                        Console().print(Markdown(
                            "Unknown and consequently unsupported platform.")))

        #```py
        #for monitor in sbc.list_monitors():
        #    logging.getLogger().debug(
        #        Console().print(Markdown(
        #            monitor, ':', sbc.get_brightness(display=monitor), '%'))
        #```

            chosen_display = 0

            slider = QSlider(Qt.Orientation.Horizontal, self)
            layout_1.addWidget(slider)
            slider.setRange(0, 100)

        #**Task(s)**: add checkbox to override chosen colour with value provided by external device (brightness sensor)

        #```py
        #label = QLabel(sbc.list_monitors()[chosen_display], self)
        #layout_1.addWidget(label)
        #    #**Task(s)**: this should be to the left of the input box.
        #```

            if ddcutil_available == True:
                #**Origin(s)**: [Redirecting Output to `/dev/null` in Python 3.3+](https://stackoverflow.com/revisions/11269627/7#:~:text=For%20python%20%3E=%203.3%2C%20Redirect,=%20os.system(%22echo%20'foo'%20%26%3E%20/dev/null%22))

                slider.setValue(sbc.get_brightness(method='ddcutil')[0])
                    #**Task(s)**: discover whether specification of a method is necessary, and if so, which to utilize.

            elif ddcutil_available == False:
                slider.setValue(sbc.get_brightness()[0])
                    #**Information**: `sbc.get_brightness(method='ddcutil')` is significantly more quick.

                if not platform.system() == 'Windows' and not platform.system() == 'Darwin':
                    logging.getLogger().debug(
                        Console().print(Markdown(
                            "Unknown and consequently unsupported platform.")))

            input_area = QLineEdit(self)
            layout_1.addWidget(input_area)

            if ddcutil_available == True:
                #**Information**: [Pylint Singleton Comparison Convention](https://pylint.pycqa.org/en/latest/user_guide/messages/convention/singleton-comparison.html)

                input_area.setPlaceholderText(str(sbc.get_brightness(method='ddcutil')[chosen_display]))
                    #**Task(s)**: discover whether specification of a method is necessary, and if so, which to utilize.

            else:
                input_area.setPlaceholderText(str(sbc.get_brightness()[chosen_display]))
                    #**Task(s)**: discover whether specification of a method is necessary, and if so, which to utilize.
                if not platform.system() == 'Windows' and not platform.system() == 'Darwin':
                    logging.getLogger().debug(
                        Console().print(Markdown(
                            "Unknown and consequently unsupported platform.")))

            application = QPushButton('Apply configuration', self)
            layout_1.addWidget(application)

            #```py
            #def onSlide(slider):
            #  input_area.setPlaceholderText(slider.value())
            #slider.valueChanged.connect(slider.valueChanged)
            #```

            #**Information**: [*Placeholder*](https://www.reddit.com/r/QtFramework/comments/10ac5kg/comment/j4734je/?utm_source=share&utm_medium=web2x&context=3)

            def on_click():
                #**Task(s)**: Use [*Placeholder*](https://stackoverflow.com/a/60785652/9731176) to apply to every checked monitor in list.

                if ddcutil_available == True:
                    #**Information**: [*Placeholder*](https://pylint.pycqa.org/en/latest/user_guide/messages/convention/singleton-comparison.html)

                    sbc.set_brightness(slider.value(), method='ddcutil')
                        #**Origin(s)**: [*Placeholder*](https://stackoverflow.com/a/15765621/9731176)

                    input_area.setPlaceholderText(str(sbc.get_brightness(method='ddcutil')[chosen_display]))

                elif ddcutil_available == False:
                    sbc.set_brightness(slider.value())
                    input_area.setPlaceholderText(str(sbc.get_brightness()[chosen_display]))
                    if not platform.system() == 'Windows' and not platform.system() == 'Darwin':
                        logging.getLogger().debug(
                            Console().print(Markdown(
                                "Unknown and consequently unsupported platform.")))

            application.clicked.connect(on_click)
            application.click()

    #**Information**: [*Placeholder*](https://forum.qt.io/topic/94834/differences-between-qapplication-qguiappication-qcoreapplication-classes?_=1720556789808&lang=en-GB#:~:text=QCoreApplication%20%2D%20base%20class.%20Use,starts%20when%20you%20call%20app.exec();.)

    app = QApplication

        #**Information**: \
        #1.  Set attributes before `sys.argv` is passed to `QApplication` constructor.
        #1.  [*Placeholder*](https://medium.com/analytics-vidhya/how-to-build-your-first-desktop-application-in-python-7568c7d74311#:~:text=the%20qquickwindow.setscenegraphbackend('software')%20should%20be%20included%20in%20your%20code%20as%20a%20fallback%20option%20for%20uses%20with%20old%20hardware%20specs%2C%20other%20than%20that%20they%20would%20see%20an%20error%20information%20as%20seen%20below%3A)

    from PyQt6.QtQuick import QQuickWindow
    QQuickWindow.setTextRenderType(
        QQuickWindow.TextRenderType.NativeTextRendering)
        #**Information**: Should enable High DPI scaling, but isn't necesssary for Qt6.

    app.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling, True)
        #**Information**: [Ensures that widgets have native windows.](https://doc.qt.io/qt-6/qt.html#:~:text=qt%3A%3Aaa_nativewindows)

    app.setAttribute(QtCore.Qt.AA_NativeWindows, True)
    app = QApplication(sys.argv)
    main_window = MainWindow()
    main_window.show()
        #**Information**: Hardcoded exit code unnecessary because `sys.exit()` provides it.

    sys.exit(app.exec())
        #**Information**: [`exec()` rather than `exec_()` is due to non-backward compatbility.](https://stackoverflow.com/revisions/22614643/4#:~:text=That's%20because%20until%20Python%203%2C,methods%20have%20been%20removed.%20...)

raise SystemExit(-1)

...per:

I suppose that that means that I'm doing something in one of the scripts that is incompatible with the command, rather than the operation itself being unsupported. Apologies if so.