How to disable "Esc quit" when using Qt backend?

[墨焓]

By default pressing Esc key will close the window (Qt backend), which is very convenient. But sometimes it is needed to disable this feature, how to do it?

[Corran Webster]

Hi,

I wasn't even aware that TraitsUI had that behaviour after 10+ years using it!

Looking at the code, it is fairly hard-coded into the View implementation, but you can override it by binding the escape key to a "do nothing" handler using TraitsUI keybindings:

from traits.api import HasTraits, Range

from traitsui.api import View, Item

from traitsui.key_bindings import KeyBinding, KeyBindings

bindings = KeyBindings(

    KeyBinding(

        binding1='Esc',

        description='Stop Escape from closing window',

        method_name='do_nothing',

    )

)

class StopEscapeClosingExample(HasTraits):

    value = Range(0, 100)

    def do_nothing(self, ui_info):

        pass

    traits_view = View(

        Item('value', enabled_when='not _running'),

        key_bindings=bindings,

    )

if __name__ == '__main__':

    example = StopEscapeClosingExample()

    example.configure_traits()

This is not the most elegant solution, but it appears to work.

Hope this helps,

-- Corran

[墨焓]

Didn't see your reply but thank you for this anyway, it's very helpful.

I was inspired by a slightly "off-topic" post at https://stackoverflow.com/questions/11036985/close-traitsui-window-without-clicking-ok, and ended up with a self-made "wrapper" handler class:

```

#!/usr/bin/env python3
# encoding=utf8
from traits.api import *
from traitsui.api import *
from traitsui.key_bindings import *

from mylib.ez import *

assert Trait


class SimpleHandler(Handler):
def __hdl_do_nothing__(self, *args):
pass

@staticmethod
def __hdl_close_view__(info: UIInfo):
if not info.initialized:
return
info.ui.dispose()

@staticmethod
def __hdl_quit__(*args):
sys.exit()

def __hdl_close_view_and_quit__(self, info: UIInfo):
self.__hdl_close_view__(info)
self.__hdl_quit__()


KB_ESC_NOTHING = KeyBinding(binding1='Esc', method_name=SimpleHandler.__hdl_do_nothing__.__name__)
KB_ESC_CLOSE = KeyBinding(binding1='Esc', method_name=SimpleHandler.__hdl_close_view__.__name__)
KB_ESC_QUIT = KeyBinding(binding1='Esc', method_name=SimpleHandler.__hdl_quit__.__name__)

```