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wxPython – CollapseAndReset() method in wx.TreeCtrl

  • Last Updated : 09 Jul, 2020

In this article we are going to learn about another function in wxPython, that is, CollapseAndReset() method associated with wx.TreeCtrl class of wxPython. CollapseAndReset() function simply collapses a particular item and removes all its children.

It takes TreeItemId as argument.

Syntax: wx.TreeCtrl.CollapseAndReset(Self, item)

Code Example:


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
        self.tree = MyTree(self, wx.ID_ANY, wx.DefaultPosition,
                                 (150,150), wx.TR_HAS_BUTTONS)
        # Add root to Tree Control
        self.root = self.tree.AddRoot('Root')
        # Add item to root
        self.itm = self.tree.AppendItem(self.root, 'Item')
        # Add item to 'itm'
        self.itm2 = self.tree.AppendItem(self.itm, "Sub Item")
        # Add child item to itm2
        self.itm3 = self.tree.AppendItem(self.itm2, "Another Item")
        # Expand whole tree
        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(self.tree, 0, wx.EXPAND)
        # Add button in frame
        self.btn = wx.Button(self, 1, "Collapse", (10,100))
        # Bind event function with button
        self.btn.Bind(wx.EVT_BUTTON, self.onclick)
    def onclick(self, e):
        # collapse all children of itm recursively
class MainFrame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, parent=None
                      title='TreeCtrl Demo')
        panel = TreePanel(self)
if __name__ == '__main__':
    app = wx.App(redirect=False)
    frame = MainFrame()


before clicking button

after clicking button

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