Expanding Weirdness

Hexrin

Hi,
So I'm having an issue where a QTextBox is getting cut off after a certain point of expanding. It seems to be acting like it has some kind of maximum width despite me never setting a maximum width. Here is my code:

from pyqtgraph import QtCore, QtGui
import sys
from sensor_msgs.msg import Imu, MagneticField, NavSatFix
from PyQt5 import QtCore, QtGui
from PyQt5.QtCore import Qt
import numpy as np
import sys

class statusUI(QtGui.QPushButton):
    
	def __init__(self):
        
		QtGui.QPushButton.__init__(self)
	
		#set the widget's height
		self.setFixedHeight(200)

		statusUILayout = QtGui.QHBoxLayout(self)

		self.scrollArea = dataScrollArea()
		statusUILayout.addWidget(self.scrollArea)

		self.setUpMagUI()

	def setUpMagUI(self):

		#create mag labels
		self.magneticFieldCovNameLabel = QtGui.QLabel("Magnetic Field Covariance: ")
		self.magneticFieldCovNumberLabel = QtGui.QLabel(str([0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]).translate(None, "'"))

		self.magneticFieldCovNameLabel.setAlignment(Qt.AlignLeft)
		self.magneticFieldCovNumberLabel.setAlignment(Qt.AlignLeft)

		self.scrollArea.addLine(self.magneticFieldCovNameLabel, self.magneticFieldCovNumberLabel)

		self.scrollArea.addStretch()

class dataScrollArea(QtGui.QScrollArea):

	def __init__(self):

		QtGui.QScrollArea.__init__(self)

		self.setWidgetResizable(True)

		# making qwidget object
		content = QtGui.QWidget(self)
		self.setWidget(content)

		self.statusesLayout = QtGui.QVBoxLayout(content)
		self.scrollbar = self.verticalScrollBar()

	def addLine(self, widget1, widget2):

		lineWidget = QtGui.QFrame()
		lineWidget.setFrameStyle(QtGui.QFrame.StyledPanel)
		lineLayout = QtGui.QHBoxLayout()
		lineWidget.setLayout(lineLayout)
		lineLayout.setAlignment(Qt.AlignLeft)
		lineLayout.addWidget(widget1)
		lineLayout.addWidget(widget2)
		self.statusesLayout.addWidget(lineWidget)
		widget2.setWordWrap(True)

	def addStretch(self):

		self.statusesLayout.addStretch()

app = QtGui.QApplication(sys.argv)
main = QtGui.QWidget()
layout = QtGui.QHBoxLayout(main)
main.show()
testWidget = QtGui.QHBoxLayout()
layout.addWidget(statusUI())
sys.exit(app.exec_())

It seems to start expanding just fine.
Screenshot from 2021-08-04 13-22-32.png

But when I get to the last 0.000, it starts to take a lot more space than it usually would when expanding...
Screenshot from 2021-08-04 13-23-31.png

And then it just cuts off the last 0.000 for some reason.
Screenshot from 2021-08-04 13-23-46.png

Can someone tell me why this is happening? Thanks for any help!
I think I'm using PyQt5, although I have to import from pyqtgraph else it doesn't work for some reason.

eyllanesc

@Hexrin The problem is mainly caused by the line lineLayout.setAlignment(Qt.AlignLeft) that you probably used so that the first column occupies the minimum space but also makes the second column compress. Instead I use stretch factors.

import sys

from pyqtgraph import QtCore, QtGui


class statusUI(QtGui.QPushButton):
    def __init__(self):
        QtGui.QPushButton.__init__(self)
        self.setMinimumHeight(200)
        statusUILayout = QtGui.QHBoxLayout(self)
        self.scrollArea = dataScrollArea()
        statusUILayout.addWidget(self.scrollArea)

        self.setUpMagUI()

    def setUpMagUI(self):
        text = str(
            [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
        ).translate({None: "'"})

        self.magneticFieldCovNameLabel = QtGui.QLabel("Magnetic Field Covariance: ")
        self.magneticFieldCovNumberLabel = QtGui.QLabel(text)

        self.magneticFieldCovNameLabel.setAlignment(QtCore.Qt.AlignLeft)
        self.magneticFieldCovNumberLabel.setAlignment(QtCore.Qt.AlignLeft)

        self.scrollArea.addLine(
            self.magneticFieldCovNameLabel, self.magneticFieldCovNumberLabel
        )

        self.scrollArea.addStretch()


class dataScrollArea(QtGui.QScrollArea):
    def __init__(self):
        QtGui.QScrollArea.__init__(self)
        self.setWidgetResizable(True)
        content = QtGui.QWidget()
        self.setWidget(content)
        self.statusesLayout = QtGui.QVBoxLayout(content)

    def addLine(self, widget1, widget2):
        widget2.setWordWrap(True)
        lineWidget = QtGui.QFrame()
        lineLayout = QtGui.QHBoxLayout(lineWidget)
        lineWidget.setLayout(lineLayout)
        lineLayout.addWidget(widget1)
        lineLayout.addWidget(widget2, stretch=1)
        self.statusesLayout.addWidget(lineWidget)

    def addStretch(self):
        self.statusesLayout.addStretch()

app = QtGui.QApplication(sys.argv)
main = QtGui.QWidget()
main.resize(640, 480)
layout = QtGui.QHBoxLayout(main)
main.show()
testWidget = QtGui.QHBoxLayout()
layout.addWidget(statusUI())
sys.exit(app.exec_())

Output:

Please for a next time remove unnecessary imports and also note that from pyqtgraph import QtCore, QtGui and from PyQt5 import QtCore, QtGui may conflict causing silent bugs.

SGaist

Hi,

Please reduce your script to a minimal reproducible case.

One main thing is that your statusUI widget is given way to much information about its parent and layout. That's not its role to insert itself in some layout. This is something for the widget creating a statusUI to handle.

Hexrin

@SGaist I've updated my post. I hope it's a bit more readable now.

eyllanesc

@Hexrin The problem is mainly caused by the line lineLayout.setAlignment(Qt.AlignLeft) that you probably used so that the first column occupies the minimum space but also makes the second column compress. Instead I use stretch factors.

import sys

from pyqtgraph import QtCore, QtGui


class statusUI(QtGui.QPushButton):
    def __init__(self):
        QtGui.QPushButton.__init__(self)
        self.setMinimumHeight(200)
        statusUILayout = QtGui.QHBoxLayout(self)
        self.scrollArea = dataScrollArea()
        statusUILayout.addWidget(self.scrollArea)

        self.setUpMagUI()

    def setUpMagUI(self):
        text = str(
            [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
        ).translate({None: "'"})

        self.magneticFieldCovNameLabel = QtGui.QLabel("Magnetic Field Covariance: ")
        self.magneticFieldCovNumberLabel = QtGui.QLabel(text)

        self.magneticFieldCovNameLabel.setAlignment(QtCore.Qt.AlignLeft)
        self.magneticFieldCovNumberLabel.setAlignment(QtCore.Qt.AlignLeft)

        self.scrollArea.addLine(
            self.magneticFieldCovNameLabel, self.magneticFieldCovNumberLabel
        )

        self.scrollArea.addStretch()


class dataScrollArea(QtGui.QScrollArea):
    def __init__(self):
        QtGui.QScrollArea.__init__(self)
        self.setWidgetResizable(True)
        content = QtGui.QWidget()
        self.setWidget(content)
        self.statusesLayout = QtGui.QVBoxLayout(content)

    def addLine(self, widget1, widget2):
        widget2.setWordWrap(True)
        lineWidget = QtGui.QFrame()
        lineLayout = QtGui.QHBoxLayout(lineWidget)
        lineWidget.setLayout(lineLayout)
        lineLayout.addWidget(widget1)
        lineLayout.addWidget(widget2, stretch=1)
        self.statusesLayout.addWidget(lineWidget)

    def addStretch(self):
        self.statusesLayout.addStretch()

app = QtGui.QApplication(sys.argv)
main = QtGui.QWidget()
main.resize(640, 480)
layout = QtGui.QHBoxLayout(main)
main.show()
testWidget = QtGui.QHBoxLayout()
layout.addWidget(statusUI())
sys.exit(app.exec_())

Output:

Please for a next time remove unnecessary imports and also note that from pyqtgraph import QtCore, QtGui and from PyQt5 import QtCore, QtGui may conflict causing silent bugs.

Hexrin

@eyllanesc

Thank you!