wxPython wx.TreeCtrl GetCount()用法及代碼示例

下麵的文章討論與wxPython的wx.TreeCtrl類關聯的GetCount()方法。 GetCount()方法用於獲得控件中存在的項目總數。

用法：wx.TreeCtrl.GetCount(self)

參數：

此方法不需要任何參數。

返回值：

它返回一個整數，即控件中的項目數。

下麵描述了如何實現它以產生某些函數：

範例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()

輸出：

7

範例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()

輸出：

3

相關用法

注：本文由純淨天空篩選整理自RahulSabharwal大神的英文原創作品 wxPython – GetCount() method in wx.TreeCtrl。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。