wxPython – Two step creation wx.TreeCtrl

In this article we are going to learn that how can we create a Tree Control using two step creation. In order to do that we will use Create() method in wx.TreeCtrl class. Basically, we will initialize tree control using TreeCtrl() constructor with empty parentheses and then we will use Create() method and attributes to associate with Tree Control.

Syntax:

wx.TreeCtrl.Create(self, parent, id=ID_ANY, pos=DefaultPosition, size=DefaultSize, style=TR_DEFAULT_STYLE, validator=DefaultValidator, name=TreeCtrlNameStr)

Parameters:

Parameter	Type	Description
parent	wx.Window	parent window/frame for Tree Control.
id	wx.WindowID	widget identifier to be associated with Tree Control
pos	wx.Point	position where to put Tree Control.
size	wx.Size	size of the Tree Control widget
style	long	style for Tree Control.
validator	wx.Validator	Validator associated withTree Control.
name	string	Name of Tree Control.

Code Example:

Python

import wx

class TreePanel(wx.Panel):

    def __init__(self, parent):
        wx.Panel.__init__(self, parent)

        # initialize Tree Control
        self.tree = wx.TreeCtrl(self, wx.ID_ANY, wx.DefaultPosition, (100, 70),
                           wx.TR_HAS_BUTTONS)

        # create Tree Control using Create() method
        self.tree.Create
        # Add root to Tree Control
        self.root = self.tree.AddRoot('Root')

        # Add item to root
        itm = self.tree.AppendItem(self.root, 'Item')

        # Add item to 'itm'
        self.tree.AppendItem(itm, "Sub Item")

        # Expand whole tree
        self.tree.Expand(self.root)

        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(self.tree, 0, wx.EXPAND)
        self.SetSizer(sizer)



class MainFrame(wx.Frame):

    def __init__(self):
        wx.Frame.__init__(self, parent = None, title ='TreeCtrl Demo')
        panel = TreePanel(self)
        self.Show()


if __name__ == '__main__':
    app = wx.App(redirect = False)
    frame = MainFrame()
    app.MainLoop()

Output: