Can I do this with wx.FileDialog?

[Dave Blosdale]

What I'm trying to accomplish:

  I have a couple of different file types which may be saved from the
application.

  When the user changes the "save as type:" popup field I'd like to be
able to 

  automatically change the extension of the string in the "filename:"
field to reflect

  the filtering extension. wx.FileDialog has a number of methods which
seems useful for this.

  However I'm having problems getting some kind of callback invoked when
the user

  modifies the "save as type:" popup field.

 

 

  e.g.

 

  Save as dialog invoked users sees

 

    filename:    usersfile.a3s

 

  Save As Type: field changed to ".zip"

 

  After changing the save sas type, I'd like the user to see 

 

    filename:    usersfile.zip

 

  But currently it still says

 

    filename:  usersfile.a3s

 

 

Some approaches I've tried:

 

  I tried using a Validator approach (see sample code below), thinking

  I'd  modify the field when the Validate() method gets invoked.

 

  With that approach the __init__() and the Clone() method would get
invoked

  but not the Validate(), TransferToWindow(), TransferFromWindow()
methods.

 

  Although wx.FileDialog derives from wx.Window (which has the
SetValidator() method)

  it doesn't seem to get invoked. From looking at examples and the
wxPython in Action book

  is seems that only wx.Control (which also derives from wx.Window) 

  derived objects might actually make use of the validator.

 

 

  I also tried deriving a subclass from wx.FileDialog (no sample code) 

  so that I could override some methods but they didn't get called
either.

  And I've seen some posts which suggest that wouldn't work.

 

  Suggestions on how this can be done? Or is this currently not
possible?

  Or have I misunderstood the wx way of doing things?

 

 

---------Sample code below----------------

 

 

 

 

# SaveSceneDialog::saveFromDialog() pops up a dialog and prompting the
user

# for a filename to save to.  Returns the filename, or None if the user
has

# cancelled.

#

 

class TestValidator(wx.PyValidator):

            def __init__(self):

                        wx.PyValidator.__init__(self)

                        print "TestValidator.__init__ called"; import
sys; sys.stdout.flush()

 

            def Clone(self):

                        print "Clone called"; import sys;
sys.stdout.flush()

                        return TestValidator()

 

            def Validate(self, win):

                        print "Validate called"; import sys;
sys.stdout.flush()

                        return True

 

            def TransferToWindow(self):

                        print "TransferToWindow called"; import sys;
sys.stdout.flush()

                        return True

 

            def TransferFromWindow(self):

                        print "TransferFromWindow called"; import sys;
sys.stdout.flush()

                        return True

 

 

class SaveSceneDialog:

            @staticmethod

            def saveFromDialog(window, filenameHint):

                        if filenameHint:

                                    filenameHint =
os.path.basename(filenameHint)

                        else:

                                    filenameHint = ''

 

                        dlg = wx.FileDialog(window, _("Save Scene As"))

 
dlg.SetDirectory(GetOptionPrefsDirectory(kPrefsLastScenePath))

                        dlg.SetFilename(filenameHint)

                        dlg.SetStyle(wx.SAVE|wx.OVERWRITE_PROMPT)

                        dlg.SetWildcard("Application File
(*.a3s)|*.a3s|Compressed Archive (*.zip)|*.zip")

 

                        dlg.SetValidator(TestValidator())

 

                        filename = None

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

                                    try:

 
OptionPrefs.instance().set(kPrefsLastScenePath, dlg.GetDirectory())

                                                filename = dlg.GetPath()

                                                print "SAVE AS
FILENAME", filename; import sys; sys.stdout.flush()

                                    except:

                                                filename = None

                                                printException()

 

                        dlg.Destroy()

                        return filename

 

 

 

 

 

 

 

 

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