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wxPython – Expand() method in wx.TreeCtrl

  • Last Updated : 25 Nov, 2020
Geek Week

In this article, we are going to learn about Expand() method associated with wx.TreeCtrl class of wxPython. Expand() method is used in order to expand and show children nodes of a particular item in Tree Control.

This function takes the tree node item as a parameter to whom we want to expand.

Syntax: wx.TreeCtrl.Expand(self, item)

Parameters:

ParametersTypeDescription
itemwx.TreeItemIdItem that we want to associate editlabel with.

Code Example:



Python




import wx 
  
  
class MyTree(wx.TreeCtrl): 
  
    def __init__(self, parent, id, pos, size, style): 
        wx.TreeCtrl.__init__(self, parent, id, pos, size, style) 
  
  
class TreePanel(wx.Panel): 
  
    def __init__(self, parent): 
        wx.Panel.__init__(self, parent) 
          
        # create tree control in window 
        self.tree = MyTree(self, wx.ID_ANY, wx.DefaultPosition, 
                           wx.DefaultSize, wx.TR_HAS_BUTTONS) 
          
        # CREATE TREE ROOT 
        self.root = self.tree.AddRoot('root'
        self.tree.SetPyData(self.root, ('key', 'value')) 
  
        # add item to root 
        item = self.tree.AppendItem(self.root, "Item"
        item2 = self.tree.AppendItem(self.root, "Item"
  
        # expand root 
        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:

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