Saving the application's state

Many applications provide some functionality that remembers the window size, location, and other visual settings that a user may have left the UI in during its last usage. Adding such a feature can be accomplished in different ways. The wx.lib package provides a PersistentControls library that can be used to store the state of a window and its child controls to a file and can then restore the state to the controls at the next launch of the application. In this recipe, we will take a look at how to integrate PersistentControls into an application.

How to do it…

Here are the steps that you need to perform:

1. First, we will define our app's App object and set AppName:

   import wx
   import wx.lib.agw.persist as PERSIST
   
   class MyApp(wx.App):
       def OnInit(self):
           self.SetAppName("PersistControls")
           self.frame = MyFrame(None, title="Save State")
           self.frame.Show()
           return True

2. Next, we will make a Panel for the app's main window that has a couple...