wxPython – wx.TreeCtrl 中的 CollapseAndReset() 方法
在本文中,我们将学习 wxPython 中的另一个函数,即与 wxPython 的 wx.TreeCtrl 类关联的 CollapseAndReset() 方法。 CollapseAndReset()函数只是折叠特定项目并删除其所有子项。
它以 TreeItemId 作为参数。
Syntax: wx.TreeCtrl.CollapseAndReset(Self, item)
代码示例:
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()
输出: