Extra row appearing in QTreeWidget PyQt

Question

I've a piece of code in which I've added two sub-items to a QTreeWidget parent item. The sub-items are set to be "editable".

I'm facing two problems here:

There appears an extra row with empty editable items. (I want "Min" and "Max" in the same row)

If I change an editable item to an empty string then it appears as if there is nothing, I would like to have some sort of a highlighter that there is an empty field in here(some sort of a box)

How can I get around these issues?

Code:

import sys
from PyQt5.QtCore import *
from PyQt5 import QtCore
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

class MainWindow(QMainWindow):

    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.FilterList = QTreeWidget()
        self.setCentralWidget(self.FilterList)
        self.setWindowTitle("Form")
        self.setGeometry(50,50,800,500)
        self.generateData()

    def generateData(self):
        self.FilterList.setColumnCount(3)
        self.FilterList.setHeaderLabels(["Filter Questions"])
        DifficultyNode = QTreeWidgetItem(["Difficulty"])
        self.FilterList.addTopLevelItem(DifficultyNode)
        self.FilterList.itemChanged.connect(self.handleItemChanged)
        EasyNode = QTreeWidgetItem(["Easy"])
        EasyNode.setCheckState(0, Qt.Unchecked)
        NormalNode = QTreeWidgetItem(["Normal"])
        NormalNode.setCheckState(0, Qt.Unchecked)
        HardNode = QTreeWidgetItem(["Hard"])
        HardNode.setCheckState(0, Qt.Unchecked)
        HardNode.setFlags(HardNode.flags() | QtCore.Qt.ItemIsEditable)
        MinNode = QTreeWidgetItem()
        MinNode.setText(1, "Min")
        MinNode.setFlags(MinNode.flags() | QtCore.Qt.ItemIsEditable)
        MaxNode = QTreeWidgetItem()
        MaxNode.setText(2, "Max")
        MaxNode.setFlags(MaxNode.flags() | QtCore.Qt.ItemIsEditable)
        
        DifficultyNode.addChild(EasyNode)
        EasyNode.addChild(MinNode)
        EasyNode.addChild(MaxNode)
        DifficultyNode.addChild(NormalNode)
        DifficultyNode.addChild(HardNode)
        

    def handleItemChanged(self, item, column):
        if item.checkState(column) == QtCore.Qt.Checked:
            print('Item Checked', item.text(column))
        elif item.checkState(column) == QtCore.Qt.Unchecked:
            print('Item Unchecked', item.text(column))

def main():
    app = QApplication(sys.argv)
    form = MainWindow()
    form.show()
    app.exec_()

main()

Typo: `MinNode.setText(2, "Max")` --> `MaxNode.setText(2, "Max")` ? — G.M., Nov 07 '21 at 12:55
@G.M. Thanks for pointing out the typo, but the things still looks pretty much the same. — Goku, Nov 07 '21 at 13:06
It's not only when you edit them, there will also be a box when you delete the "Min" or "Max" text and the item is deselected. — alec, Nov 09 '21 at 08:08
@alec Yes I've understood that much. Maybe the question wasn't clear enough. I don't want a box in column one. I only want it ```only over the items which are editable``` ("Min" and "Max" in this case) and that too from the beginning. — Goku, Nov 09 '21 at 08:14
@alec I want the user to actually know where he has to enter/edit the values. The moment I delete the "Min", "Max" in this case, the end user will never be able to know where he has to enter the values. — Goku, Nov 09 '21 at 08:17

alec · Accepted Answer · 2021-11-09T08:32:41.320

To get "Min" and "Max" on the same row, use only one QTreeWidgetItem and set the text for both columns.

If you want a permanent box, an option is to set the itemWidget of a QTreeWidgetItem to a QLineEdit and connect its editingFinished to set the item text.

class MainWindow(QMainWindow):

    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.FilterList = QTreeWidget()
        self.setCentralWidget(self.FilterList)
        self.setWindowTitle("Form")
        self.setGeometry(50,50,800,500)
        self.generateData()

    def generateData(self):
        self.FilterList.setColumnCount(3)
        self.FilterList.setHeaderLabels(["Filter Questions"])
        DifficultyNode = QTreeWidgetItem(["Difficulty"])
        self.FilterList.addTopLevelItem(DifficultyNode)
        self.FilterList.itemChanged.connect(self.handleItemChanged)
        EasyNode = QTreeWidgetItem(["Easy"])
        EasyNode.setCheckState(0, Qt.Unchecked)
        NormalNode = QTreeWidgetItem(["Normal"])
        NormalNode.setCheckState(0, Qt.Unchecked)
        HardNode = QTreeWidgetItem(["Hard"])
        HardNode.setCheckState(0, Qt.Unchecked)
        HardNode.setFlags(HardNode.flags() | QtCore.Qt.ItemIsEditable)
        MinNode = QTreeWidgetItem()
        
        DifficultyNode.addChild(EasyNode)
        EasyNode.addChild(MinNode)
        DifficultyNode.addChild(NormalNode)
        DifficultyNode.addChild(HardNode)

        self.setTextBox(MinNode, 1, "Min")
        self.setTextBox(MinNode, 2, "Max")

    def setTextBox(self, item, column, text):
        box = QLineEdit(text)
        box.editingFinished.connect(lambda: item.setText(column, box.text()))
        self.FilterList.setItemWidget(item, column, box)

    def handleItemChanged(self, item, column):
        if item.checkState(column) == QtCore.Qt.Checked:
            print('Item Checked', item.text(column))
        elif item.checkState(column) == QtCore.Qt.Unchecked:
            print('Item Unchecked', item.text(column))

Could you please also tell me how to highlight the editable text field? In the current scenario the moment the text is changed to an empty string, it gives a feel to the end user as if nothing exists there. — Goku, Nov 08 '21 at 09:57
please have a look in the "UPDATE" above, the solution doesn't seem right. — Goku, Nov 09 '21 at 08:01

Extra row appearing in QTreeWidget PyQt

1 Answers1