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import wx

import os.path

class MainWindow(wx.Frame):

def __init__(self, filename='noname.txt'):

super(MainWindow, self).__init__(None, size=(400,200))

self.filename = filename

self.dirname = '.'

self.CreateInteriorWindowComponents()

self.CreateExteriorWindowComponents()

def CreateInteriorWindowComponents(self):

''' Create "interior" window components. In this case it is just a

simple multiline text control. '''

self.control = wx.TextCtrl(self, style=wx.TE_MULTILINE)

def CreateExteriorWindowComponents(self):

''' Create "exterior" window components, such as menu and status

bar. '''

self.CreateMenu()

self.CreateStatusBar()

self.SetTitle()

def CreateMenu(self):

fileMenu = wx.Menu()

for id, label, helpText, handler in \

[(wx.ID_ABOUT, '&About', 'Information about this program',

self.OnAbout),

(wx.ID_OPEN, '&Open', 'Open a new file', self.OnOpen),

(wx.ID_SAVE, '&Save', 'Save the current file', self.OnSave),

(wx.ID_SAVEAS, 'Save &As', 'Save the file under a different name',

self.OnSaveAs),

(None, None, None, None),

(wx.ID_EXIT, 'E&xit', 'Terminate the program', self.OnExit)]:

if id == None:

fileMenu.AppendSeparator()

else:

item = fileMenu.Append(id, label, helpText)

self.Bind(wx.EVT_MENU, handler, item)

menuBar = wx.MenuBar()

menuBar.Append(fileMenu, '&File') # Add the fileMenu to the MenuBar

self.SetMenuBar(menuBar) # Add the menuBar to the Frame

def SetTitle(self):

# MainWindow.SetTitle overrides wx.Frame.SetTitle, so we have to

# call it using super:

super(MainWindow, self).SetTitle('Editor %s'%self.filename)

# Helper methods:

def defaultFileDialogOptions(self):

''' Return a dictionary with file dialog options that can be

used in both the save file dialog as well as in the open

file dialog. '''

return dict(message='Choose a file', defaultDir=self.dirname,

wildcard='*.*')

def askUserForFilename(self, **dialogOptions):

dialog = wx.FileDialog(self, **dialogOptions)

if dialog.ShowModal() == wx.ID_OK:

userProvidedFilename = True

self.filename = dialog.GetFilename()

self.dirname = dialog.GetDirectory()

self.SetTitle() # Update the window title with the new filename

else:

userProvidedFilename = False

dialog.Destroy()

return userProvidedFilename

# Event handlers:

def OnAbout(self, event):

dialog = wx.MessageDialog(self, 'A sample editor\n'

'in wxPython', 'About Sample Editor', wx.OK)

dialog.ShowModal()

dialog.Destroy()

def OnExit(self, event):

self.Close() # Close the main window.

def OnSave(self, event):

textfile = open(os.path.join(self.dirname, self.filename), 'w')

textfile.write(self.control.GetValue())

textfile.close()

def OnOpen(self, event):

if self.askUserForFilename(style=wx.OPEN,

**self.defaultFileDialogOptions()):

textfile = open(os.path.join(self.dirname, self.filename), 'r')

self.control.SetValue(textfile.read())

textfile.close()

def OnSaveAs(self, event):

if self.askUserForFilename(defaultFile=self.filename, style=wx.SAVE,

**self.defaultFileDialogOptions()):

self.OnSave(event)

app = wx.App()

frame = MainWindow()

frame.Show()

app.MainLoop()