wxPython wx.TreeCtrl中的GetChildrenCount()方法

在这篇文章中，我们将学习与wxPython的wx.TreeCtrl类相关的GetChildren方法。返回分支中的项目数量。GetChildren() 方法需要两个参数，一个是 item，另一个是递归。

recursively是一个布尔参数，如果recursively为True，则返回子孙的总数，否则只计算一级子孙。GetChildrenCount()返回int（与TreeCtrl项相关的子女总数）。

语法： wx.TreeCtrl.GetChildrenCount()

参数。

参数	类型	说明
item	wx.TreeItemId	我们要确保可见的项目。
recursively	布尔型	递归地获取孩子。

例1 :

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")
        item4 = self.tree.AppendItem(item, "SubItem")
        item5 = self.tree.AppendItem(item2, "SubItem")
        item6 = self.tree.AppendItem(item, "SubItem")
  
        # expand root node
        print(self.tree.GetChildrenCount(self.root, False))
  
        # expand all nodes of the tree
        self.tree.Expand() 
          
        sizer = wx.BoxSizer(wx.VERTICAL) 
        sizer.Add(self.tree, 100, 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()

输出。

2

wxPython - wx.TreeCtrl中的GetChildrenCount()方法

例2 :

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")
        item4 = self.tree.AppendItem(item, "SubItem")
        item5 = self.tree.AppendItem(item2, "SubItem")
        item6 = self.tree.AppendItem(item, "SubItem")
  
        # expand root node
        print(self.tree.GetChildrenCount(self.root, True))
  
        # expand all nodes of the tree
        self.tree.ExpandAllChildren(item) 
          
        sizer = wx.BoxSizer(wx.VERTICAL) 
        sizer.Add(self.tree, 100, 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()

输出。