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Source Code:
import sys
from PyQt6.QtWidgets import QApplication, QWidget, QLineEdit, QTreeWidget, QTreeWidgetItem, \
QHBoxLayout, QVBoxLayout, QItemDelegate
from PyQt6.QtCore import Qt, QRegularExpression #QRegExp
from PyQt6.QtGui import QRegularExpressionValidator
class TreeWidgetDelegate(QItemDelegate):
def createEditor(self, parent, option, index):
editor = QLineEdit(parent=parent)
pattern = '[A-z0-9]+'
reg = QRegularExpression(pattern)
reg_validator = QRegularExpressionValidator(reg)
editor.setValidator(reg_validator)
return editor
class MyApp(QWidget):
def __init__(self):
super().__init__()
self.window_width, self.window_height = 700, 500
self.resize(self.window_width, self.window_height)
self.layout = QVBoxLayout()
self.setLayout(self.layout)
self.tree = QTreeWidget()
self.tree.itemDoubleClicked.connect(self.rename_value)
#self.tree.itemChanged.connect(self.checkName, Qt.QueuedConnection) # <-- for PyQt5
self.tree.itemChanged.connect(self.checkName, Qt.ConnectionType.QueuedConnection)
self.layout.addWidget(self.tree)
for i in range(5):
item = QTreeWidgetItem([str(i)*3])
self.tree.addTopLevelItem(item)
delegate = TreeWidgetDelegate()
self.tree.setItemDelegate(delegate)
def checkName(self, item, column):
item_text = item.data(0, 0)
siblings = self.getSiblings(item)
if item_text in siblings:
print('Duplicate Item')
item.setData(0, 0, 'Please enter a new value')
self.tree.editItem(item)
def getSiblings(self, item):
siblings = [self.tree.topLevelItem(i).data(0, 0) for i in range(self.tree.topLevelItemCount())]
item_text = item.data(0, 0)
if item_text in siblings:
siblings.remove(item_text)
return siblings
def rename_value(self):
item = self.tree.selectedItems()
if item:
item = item[0]
item.setFlags(item.flags() | Qt.ItemFlags.ItemIsEditable)
if __name__ == '__main__':
# don't auto scale when drag app to a different monitor.
# QGuiApplication.setHighDpiScaleFactorRoundingPolicy(Qt.HighDpiScaleFactorRoundingPolicy.PassThrough)
app = QApplication(sys.argv)
app.setStyleSheet('''
QWidget {
font-size: 17px;
}
''')
myApp = MyApp()
myApp.show()
try:
sys.exit(app.exec())
except SystemExit:
print('Closing Window...')
