Intercept keyboard request

[Ian Collins]

Hi,

Is it possible, in a textinput, to intercept the event that requests to open the keyboard?

And either cancel the open request or continue opening the keyboard?

Thanks,

Ian

[ZenCODE]

As far as I remember, you can do this by sub-classing and overriding the 'on_focus' event. If you don't want to display the keyboard, return True. If you do, call the super method for it. That should do it? Shout if that's too obscure or does not work :-)

Peace

[Ian Collins]

Hi, Thanks for the suggestion. What bits am I missing in the following....

class BTextInput(TextInput):
    def __init__(self, **kwargs):
        super(BTextInput, self).__init__(**kwargs)

              # whats the syntax to bind the focus event ? (if thats what I need to do).

       def on_focus(self, value)

            # do I just return true or false depending on my needs

            return ???

Cheers, Ian

[ZenCODE]

Correct. Returning True will stop the event bubbling and it will never reach the TextInput, otherwise

    return super(BTextInput, self).on_focus(value)

will bubble the event as normal.

[bagpuss]

When I run my app - clicking on that textinput gives...

   File "C:\cygwin64\home\ian.collins\Kivy-1.9.0-py2.7-win32-x64\kivy27\kivy\uix\textinput.py", line 1047, in on_touch_down

     if super(TextInput, self).on_touch_down(touch):

   File "C:\cygwin64\home\ian.collins\Kivy-1.9.0-py2.7-win32-x64\kivy27\kivy\uix\behaviors.py", line 843, in on_touch_down

     self.focus = True

   File "kivy\properties.pyx", line 397, in kivy.properties.Property.__set__ (kivy\properties.c:4680)

   File "kivy\properties.pyx", line 429, in kivy.properties.Property.set (kivy\properties.c:5203)

   File "kivy\properties.pyx", line 484, in kivy.properties.Property.dispatch (kivy\properties.c:5852)

   File "kivy\_event.pyx", line 1168, in kivy._event.EventObservers.dispatch (kivy\_event.c:12154)

   File "kivy\_event.pyx", line 1074, in kivy._event.EventObservers._dispatch (kivy\_event.c:11451)

 TypeError: on_focus() takes exactly 2 arguments (3 given)

Process finished with exit code -1

Thats with...

def on_focus(self, value):
    if value:
        Logger.debug('CRV: ti focused')
    else:
        Logger.debug('CRV: ti DEfocused')
    super(BTextInput, self).on_focus(value)

and,

self.bind(focus=self.on_focus)

???
Regards, Ian.

Regards,

Ian Collins

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[ZenCODE]

Try

def on_focus(self, widget, value):

    if value:
        Logger.debug('CRV: ti focused')
    else:
        Logger.debug('CRV: ti DEfocused')

    return super(BTextInput, self).on_focus(widget, value)

[bagpuss]

Hi,

Can you explain the error I now get - after adding in your previous suggestion - which I should have guessed :-)  .... (bold below)...

File "kivy\properties.pyx", line 484, in kivy.properties.Property.dispatch (kivy\properties.c:5852)

   File "kivy\_event.pyx", line 1168, in kivy._event.EventObservers.dispatch (kivy\_event.c:12154)

   File "kivy\_event.pyx", line 1074, in kivy._event.EventObservers._dispatch (kivy\_event.c:11451)

   File "C:/cygwin64/home/ian.collins/Kivy-1.9.0-py2.7-win32-x64/crv/main.py", line 1030, in on_focus

     super(BTextInput, self).on_focus(widget, value)

 AttributeError: 'super' object has no attribute 'on_focus'

libpng warning: iCCP: known incorrect sRGB profile

BTextInput is defined.... class BTextInput(TextInput):

Regards, Ian

Regards,

Ian Collins

--

[ZenCODE]

Okay, the 'on_focus' event is dynamically added via the 'focus' behaviour, so using super won't work as it's not. properly speaking, an inherited method...Hmmm...

You could try setting the 'readonly' property to True? Also experiment with the 'on_enter' event, as that might be a better place to set the 'readonly' property that the 'on_focus' event.

Otherwise, you could override the '_ensure_keyboard' method to prevent the keyboard request, but that's beginning to get a bit messy.

    def _ensure_keyboard(self):
        if booNoKeyboard:
            pass
        else:
            return super(BTextInput, self)._ensure_keyboard()