Hello, I am fighting with EVT_KILL_FOCUS for quite a time now and I don't succeed at all.
Situation: If a user leaves a textfield the entered information should be checked and an additional window should be opened to make a search possible to complete the entry. Basic solution: def __init__(...): ... self.artikelnrBox = wxTextCtrl(self.bestelldialog, -1, artikelnr, wxPoint(60,290), wxSize(60, -1)) ... EVT_KILL_FOCUS(self.artikelnrBox, self.OnArtikel) ... def OnArtikel(self,event): event.Skip() .... artikelnr = self.artikelnrBox.GetValue().strip() ... dialog = dialog_stamm_artikel.ArtikelSucheDialog(self.bestelldialog,artikelnr) ergebnis,artikelid = dialog.GetValues() dialog.Destroy() ... Problem: If I don't open any dialog everything works fine. But if there is a dialog around the window opens, I can count to two and the whole application crashes. The error message is: (gui.py:29768): Gtk-WARNING **: GtkEntry - did not receive focus-out-event. If you connect a handler to this signal, it must return FALSE so the entry gets the event as well Gtk-ERROR **: file gtkentry.c: line 4919 (blink_cb): assertion failed: (GTK_WIDGET_HAS_FOCUS (entry)) aborting... Reason of the problem: I found a very good description for the reason: > This is a lot easier to understand with a timeline: > - focus into GtkEntry > - GtkEntry installs timeout for cursor blinking > - focus out of entry > - GtkEntry emits focus-out-event > - your handler runs **before the default handler**. > - your handler traps exception and creates dialog box > - dialog box runs nested event loop > - event processing continues, focus goes to another widget > - entry's cursor blink timeout is still installed, and runs again. > entry does not have focus, but timeout has run, so the widget > is in an invalid state and calls g_error() with a nastygram. > - default handler runs, uninstalls cursor blink timeout > The problem is that you're allowing the event loop to run in your handler for > focus-out. Ok, if I use EVT_KILL_FOCUS the event has not finished completly, this timeout is still around. That's ok with me but I thought this is what event.Skip() is for, to call the standard handler. Solution: And there I am. event.Skip() doesn't help at all. And the other source gives the following suggestion: > a) use signal_connect_after to have your handler run *after* the default > handler for focus-out-event instead of before. > b) leave the signal connected normally, but in your "catch" block, instead of > running the dialog right then, defer it with an idle, like this: I couldn't find signal_connect_after anywhere in wxpython and I don't know how to use idle in this case. And I have the problem more than once (every time a have an error message in other EVT_KILL_FOCUS routines). There must be some solution to use EVT_KILL_FOCUS and a dialog without killing the application. Please help! Steffi -- http://mail.python.org/mailman/listinfo/python-list
