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:
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 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 self.tree.ExpandAll() sizer = wx.BoxSizer(wx.VERTICAL) sizer.Add(self.tree, 0, wx.EXPAND) self.SetSizer(sizer) # 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 self.tree.CollapseAndReset(self.itm) 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:
before clicking button
after clicking button
