[FIXED] Hiding decorator on QTreeView in PyQt?

Issue

I found this code snippet of code on SO:

from PyQt4 import QtCore, QtGui

class Window(QtGui.QWidget):
    def __init__(self):
        QtGui.QWidget.__init__(self)
        self.tree = QtGui.QTreeWidget(self)
        self.tree.setHeaderHidden(True)
        for index in range(2):
            parent = self.addItem(self.tree, 'Item%d' % index)
            for color in 'Red Green Blue'.split():
                subitem = self.addItem(parent, color)
                for letter in 'ABC':
                    self.addItem(subitem, letter, True, False)
        layout = QtGui.QVBoxLayout(self)
        layout.addWidget(self.tree)
        self.tree.itemChanged.connect(self.handleItemChanged)

    def addItem(self, parent, text, checkable=False, expanded=True):
        item = QtGui.QTreeWidgetItem(parent, [text])
        if checkable:
            item.setCheckState(0, QtCore.Qt.Unchecked)
        else:
            item.setFlags(
                item.flags() & ~QtCore.Qt.ItemIsUserCheckable)
        item.setExpanded(expanded)
        return item

    def handleItemChanged(self, item, column):
        if item.flags() & QtCore.Qt.ItemIsUserCheckable:
            path = self.getTreePath(item)
            if item.checkState(0) == QtCore.Qt.Checked:
                print('%s: Checked' % path)
            else:
                print('%s: UnChecked' % path)

    def getTreePath(self, item):
        path = []
        while item is not None:
            path.append(str(item.text(0)))
            item = item.parent()
        return '/'.join(reversed(path))

if __name__ == '__main__':

    import sys
    app = QtGui.QApplication(sys.argv)
    window = Window()
    window.setGeometry(500, 300, 250, 450)
    window.show() 

I wonder, how can i hide the decorators from the result, on all of the items?

• I know i can hide with setstylesheet doesn't actually removed the arrows, just hide them, which is counterproductive if you accidentally hide them.

• item.setChildPolicy(QTreeWidgetItem.DontShowIndicator) either removes the children, or permanently closes them, because the subitems(children of item) all disappear once i do that, and can't do anything with... Tried to expand too, does't work for me.

Actually in PyQt5, so the answer doesn't need to be in PyQt4.

Solution

I got a potential solution from here: How do you disable expansion in QTreeWidget/QTreeView?

Using setStyleSheet, as suggested by eyllanesc, to visibly hide the arrow decorator:

self.tree.setStyleSheet( "QTreeWidget::branch{border-image: url(none.png);}")

and then setting:

self.tree.setItemsExpandable(False)

You can successfully hide and disable the arrow decorators.

Personally, I have used this method when using a QPushButton to control the expanding of the QTreeWidgetItems.

example code

def __init__(self):
    self.button = QtWidgets.QPushButton(text="toggle tree item")
    self.button.setCheckable = True
    self.button.toggled.connect(self.button_clicked)

def button_clicked(self, toggled):
    self.tree_widget_item.setExpanded(toggled)

Answered By - Adam Sirrelle