wxPython – ExpandAll() method in wx.TreeCtrl

In this article we are going to learn about ExpandAll() method associated with wx.TreeCtrl class of wxPython. ExpandAll() method is similar to Expand() but the only difference is that this method is used to expand all the items present in the Tree Control. All child nodes  along with their parent nodes are visible using this method.

No parameters are required by this method.

Syntax: wx.TreeCtrl.ExpandAll(self)

Parameters:

No parameters are required by this method.

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")
        item3 = self.tree.AppendItem(item, "SubItem")

        # expand all nodes of the tree
        self.tree.ExpandAll()

        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: