In this article we are going to learn about EnsureVisible() function associated with wx.TreeCtrl class of wxPython. EnsureVisible() method makes an item/root to be visible on screen. Scrolls and/or expands items to ensure that the given item is visible.
This method can be used, and will work, even while the window is frozen (see wx.Window.Freeze ).
Syntax: wx.TreeCtrl.EnsureVisible()
Parameters:
Parameter Type Description item wx.TreeItemId item that we want to ensure to be visible.
Code Example:
Python3
import wx class TreePanel(wx.Panel): def __init__(self, parent): wx.Panel.__init__(self, parent) self.tree = wx.TreeCtrl(self, wx.ID_ANY, wx.DefaultPosition, (100, 50), wx.TR_HAS_BUTTONS) # create tree root self.root = self.tree.AddRoot('root') self.tree.SetPyData(self.root, ('key', 'value')) # add items to root item = self.tree.AppendItem(self.root, "Item") item2 = self.tree.AppendItem(self.root, "Item") item3 = self.tree.AppendItem(self.root, "Item") item4 = self.tree.AppendItem(self.root, "Item") focusitem = self.tree.AppendItem(self.root, "Focus Item") # expand root self.tree.Expand(self.root) self.tree.EnsureVisible(focusitem) sizer = wx.BoxSizer(wx.VERTICAL) sizer.Add(self.tree, 0, wx.EXPAND) self.SetSizer(sizer) def onclick(self, e): # Delete si2 from the tree self.tree.Delete(self.si2) 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:
