[PyQt] QScrollArea does not work

[HeinKurz]

Hi!
What's wrong with my code? QScrollArea is shown but scrolling doesn't work.

import sys
import datetime
import xml.etree.ElementTree as ET
from PyQt5.QtWidgets import *  #QApplication, QDialog, QMainWindow, QMessageBox, QPushButton
from PyQt5 import QtWidgets
from PyQt5.QtCore import *
from PyQt5 import QtCore
from PyQt5.QtGui import *
from PyQt5 import QtGui
#from PyQt5 import uic

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

        self.resize(900, 600)
        self.setMinimumSize(900, 600)
        self.setWindowTitle("Gewicht")
        self.setWindowIcon(QIcon("Gewicht.png"))

        # Tab
        tabWidget = QTabWidget(self)
        tabWidget.setContextMenuPolicy(Qt.DefaultContextMenu)
        self.setCentralWidget(tabWidget)
        
        # Tab Daten
        tabDaten = QWidget()
        # ...

        # Tab Grafik
        tabGrafik = QWidget()
        tabWidget.addTab(tabGrafik, "Grafik")

        scrollArea = QScrollArea(tabGrafik)
        scrollArea.setGeometry(10, 100, 870, 430)
        sp2 = QSizePolicy(QSizePolicy.Expanding, QSizePolicy.Fixed)
        sp2.setHorizontalStretch(0)
        sp2.setVerticalStretch(0)
        sp2.setHeightForWidth(scrollArea.sizePolicy().hasHeightForWidth())  # ???
        scrollArea.setSizePolicy(sp2)
        scrollArea.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        scrollArea.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
        scrollArea.setWidgetResizable(False)   # !?!?!?!
        scrollArea.setAutoFillBackground(False)
        sawc = QWidget(scrollArea)   # scrollAreaWidgetContents
        sawc.setGeometry(QRect(1, 1, 1200, 405))
        sp3 = QSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)  # Preferred  !?!?!?
        sp3.setHorizontalStretch(0)
        sp3.setVerticalStretch(0)
        sp3.setHeightForWidth(sawc.sizePolicy().hasHeightForWidth())  # ???
        sawc.setSizePolicy(sp3)
        sawc.setMinimumSize(QSize(1200, 405))    # !?!?!?
        sawc.setStyleSheet("background-color:aquamarine;")
        pushButtonNeu = QPushButton(sawc)
        pushButtonNeu.setText("Neu")
        pushButtonNeu.setGeometry(QRect(10, 20, 1040, 90))
        pushButtonNeu.setStyleSheet("background-color:gray;")

        # Tab Infos
        tabInfos = QWidget()
        tabWidget.addTab(tabInfos, "Infos, Statistik")


        def tabChange(seltab):
            if seltab == 1:
                # ...
            if seltab == 2:
                # ...

        # Actions
        tabWidget.currentChanged.connect(tabChange)


app = QApplication(sys.argv)
window = MainWindow()
window.show()
app.exec()

[Axel_Erfurt]

There is nothing to scroll and your imports are a disaster. Don't use import *. Don't use setGeometry for widgets. Use a layout.

[deanhystad]

You added a widget to the scroll widget window, but not in the correct way. Use scroll_area.setWidget(scrolled_widget).

You should also use layout managers instead of setGeometry. Run the attached program and see how easily it adapts to changes in window size. This would be very difficult if you placed and resized all the widgets yourself, but it happens automatically when you use a layout manager.

import sys
from PySide6.QtWidgets import (
    QApplication,
    QWidget,
    QScrollArea,
    QLabel,
    QVBoxLayout,
    QPushButton,
)


text = (
    "The scroll bars appearance depends on the currently set scroll bar policies.  "
    "You can control the appearance of the scroll bars using the inherited functionality "
    "from QAbstractScrollArea.\n"
    "\n"
    "For example, you can set the horizontalScrollBarPolicy and verticalScrollBarPolicyproperties. "
    "Or if you want the scroll bars to adjust dynamically when the contents of the scroll area "
    "changes, you can use the horizontalScrollBar() and verticalScrollBar() functions "
    "(which enable you to access the scroll bars) and set the scroll bars’ values whenever the "
    "scroll area’s contents change, using the setValue() function.\n"
    "\n"
    "You can retrieve the child widget using the widget() function. The view can be made to be "
    "resizable with the setWidgetResizable() function. The alignment of the widget can be "
    "specified with setAlignment().\n"
)


class MainWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.pane = QWidget()
        self.view = QScrollArea()
        self.view.setWidget(self.pane)
        self.view.setWidgetResizable(True)
        layout = QVBoxLayout(self)
        layout.addWidget(self.view)

        self.text = QLabel(text)
        self.text.setWordWrap(True)
        self.text.setMinimumWidth(300)
        self.button = QPushButton(text="Push Me")
        layout = QVBoxLayout(self.pane)
        layout.addWidget(self.text)
        layout.addWidget(self.button)


app = QApplication(sys.argv)
window = MainWindow()
window.show()
app.exec()

[HeinKurz]

Thanks deanhystad, that's great.