changing GUI screens?

[JA5ONS]

so i have created a program,
im not sure how to change gui screens, for example, the first screen is username/password on the opening scree, and than it will move onto the next screen where i can input data when i have enterd password correctly.

cheers

[slate]

Can you show same code?
Which gui toolkit you use?

[shadwickman]

If you're using wxPython, then I wrote a heavily commented snippet below showing it. There might be a better way, but this is all I could come up with at the moment. If any other users have a different idea, please post it too!

import wx

#  First screen
class Screen1( wx.Panel ):
    def __init__( self, parent, id ):
        wx.Panel.__init__( self, parent, id )
        self.parent = parent  #  Make 'parent' accessible to all functions on this screen

        #  Widgets
        self.szr = wx.BoxSizer( wx.VERTICAL )
        self.btn = wx.Button( self, 100, "Change Screen" )  #  Make a button to change screens
        self.Bind( wx.EVT_BUTTON, self.OnChange, id=100 )  #  Bind an event to it

        #  Layout
        self.szr.Add( self.btn, 0, wx.ALIGN_CENTER )
        self.SetSizer( self.szr )
        self.SetSize( parent.GetSize() )  #  Set this panel to take up the whole frame

    #  Button event to change screens
    def OnChange( self, event ):
        parent = self.parent  #  Save the 'parent' variable before being destroyed
        self.Destroy()  #  Destroy the current panel
        Screen2( parent, -1 )  #  Set the new screen suing the saved parent variable


#  Second screen
class Screen2( wx.Panel ):
    def __init__( self, parent, id ):
        wx.Panel.__init__( self, parent, id )

        #  Widgets
        self.szr = wx.BoxSizer( wx.VERTICAL )
        self.txt = wx.StaticText( self, -1, "Panel 2" )

        #  Layout
        self.szr.Add( self.txt, 0, wx.ALIGN_CENTER )
        self.SetSizer( self.szr )
        self.SetSize( parent.GetSize() )  #  Set this panel to take up the whole frame


#  Run the app
app = wx.App()
frame = wx.Frame( None, -1, "MyGUI", size=(200, 150) )  #  Make the main application frame
Screen1( frame, -1 )  #  Make the frame show the first screen  (pass 'frame' as the parent )
frame.Centre()
frame.Show( True )
app.MainLoop()

(The comments kinda wrap around when look at it as code on the site, but paste it into your Python editor to see it better).

[JA5ONS]

thanks for that so far.
we are using tkinter

[shadwickman]

Oh, tkinter. I can't really help you there then. I've only used wxPython before.