Create Treeview with PyQt6

 This demo program show how to create a side menu using a treeview.

The output:

 

The code:

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import sys import os from PyQt6.QtWidgets import QApplication, QVBoxLayout, QWidget, QPushButton, QTreeView from PyQt6.QtCore import Qt from PyQt6.QtGui import QFont, QColor, QStandardItemModel, QStandardItem class StandardItem(QStandardItem): def __init__(self, txt='', font_size=12, set_bold=False, color=QColor(0, 0, 0), color1=QColor(0, 0, 0)): super().__init__() fnt = QFont('Open Sans', font_size) fnt.setBold(set_bold) self.setEditable(False) self.setForeground(color) self.setBackground(color1) self.setFont(fnt) self.setText(txt) class Window(QWidget): def __init__(self): super(Window, self).__init__() self.initUI() def initUI(self): self.treeView = QTreeView() self.treeView.setHeaderHidden(True) treeModel = QStandardItemModel() rootNode = treeModel.invisibleRootItem() america = StandardItem('Accounting', 12, set_bold=True, color1=QColor('#4d88ff')) california = StandardItem(' Accounts Payable', 10, color1=QColor('#80aaff')) america.appendRow(california) oakland = StandardItem(' Vendors', 8, color=QColor('#3939ac'), color1=QColor('#b3ccff')) sanfrancisco = StandardItem(' Incoming Invoice', 8, color=QColor('#3939ac'), color1=QColor('#b3ccff')) sanjose = StandardItem(' Purchases', 8, color=QColor('#3939ac'), color1=QColor('#b3ccff')) california.appendRow(oakland) california.appendRow(sanfrancisco) california.appendRow(sanjose) texas = StandardItem(' Accounts Receivable', 10, color1=QColor('#80aaff')) america.appendRow(texas) austin = StandardItem(' Customers', 8, color=QColor('#3939ac'), color1=QColor('#b3ccff')) houston = StandardItem(' Outbound Invoices', 8, color=QColor('#3939ac'), color1=QColor('#b3ccff')) cali = StandardItem(' Dunning', 8, color=QColor('#3939ac'), color1=QColor('#b3ccff')) dallas = StandardItem(' Sales', 8, color=QColor('#3939ac'), color1=QColor('#b3ccff')) texas.appendRow(austin) texas.appendRow(houston) texas.appendRow(cali) texas.appendRow(dallas) # Canada canada = StandardItem('Logistics', 12, set_bold=True, color1=QColor('#4d88ff')) alberta = StandardItem(' Inventory', 10, color1=QColor('#80aaff')) bc = StandardItem(' Materials', 10, color1=QColor('#80aaff')) ontario = StandardItem(' Deliveries', 10, color1=QColor('#80aaff')) canada.appendRows([alberta, bc, ontario]) rootNode.appendRow(america) rootNode.appendRow(canada) self.treeView.setModel(treeModel) self.treeView.expandAll() self.treeView.doubleClicked.connect(self.getValue) self.treeView.setIndentation(0) self.treeView.setAlternatingRowColors(True) self.pb1 = QPushButton('Exit', self) self.pb1.setGeometry(self.width()-110, self.height()-40, 100, 30) self.pb1.clicked.connect(onClick_pb1) self.pb2 = QPushButton('Click Me!', self) self.pb2.setGeometry(self.width()-220, self.height()-40, 100, 30) self.pb2.clicked.connect(self.onClick_pb2) self.pb3 = QPushButton('Open Notepad', self) self.pb3.setGeometry(self.width()-330, self.height()-40, 100, 30) self.pb3.clicked.connect(onClick_pb3) self.setGeometry(50, 65, 650, 450) self.treeView.setFixedSize(170,self.height()-25) self.setWindowTitle('Post 24') windowLayout = QVBoxLayout(self) windowLayout.addWidget(self.treeView, alignment=Qt.AlignmentFlag.AlignTop) self.show() def resizeEvent(self, event): self.treeView.setFixedSize(170,self.height()-25) self.pb1.setGeometry(self.width()-110, self.height()-40, 100, 30) self.pb2.setGeometry(self.width()-220, self.height()-40, 100, 30) self.pb3.setGeometry(self.width()-330, self.height()-40, 100, 30) def onClick_pb2(self): print("clicked") def getValue(self, val): print(val.data()) print(val.row()) print(val.column()) def onClick_pb3(): os.popen(r"C:\WINDOWS\system32\notepad.exe") def onClick_pb1(): exit() def main(): app = QApplication(sys.argv) ex = Window() sys.exit(app.exec()) if __name__ == '__main__': main()