wxPython – Expand() method in wx.TreeCtrl
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:
Parameters | Type | Description |
item | wx.TreeItemId | Item 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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