wxPython wx.TreeCtrl GetCount()用法及代码示例

下面的文章讨论与wxPython的wx.TreeCtrl类关联的GetCount()方法。 GetCount()方法用于获得控件中存在的项目总数。

用法：wx.TreeCtrl.GetCount(self)

参数：

此方法不需要任何参数。

返回值：

它返回一个整数，即控件中的项目数。

下面描述了如何实现它以产生某些函数：

范例1：

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") 
        item4 = self.tree.AppendItem(item, "SubItem") 
        item5 = self.tree.AppendItem(item2, "SubItem") 
        item6 = self.tree.AppendItem(item, "SubItem") 
  
        # expand root node 
        print(self.tree.GetCount()) 
  
        # 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() 
  
  
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") 
  
        # print total items in treectrl 
        print(self.tree.GetCount()) 
  
        # 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：

7

范例2：

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") 
  
        # print number of items in treectrl 
        print(self.tree.GetCount()) 
  
        # 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：

3

相关用法

注：本文由纯净天空筛选整理自RahulSabharwal大神的英文原创作品 wxPython – GetCount() method in wx.TreeCtrl。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。