python - Best practice for TextInput validation in kivy/kv -

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i'm designing gui android kivy. there many textinput-fields, of them need kind of validation. i've found far is, on_text_validate allow plausibility checks, if user leaves field enter, case in android-environment. how can achieve checks if user sets focus widget tapping? doing (allways) on_text seems bit weird me, maybe it's possible. simple example: how make sure user able insert integers , value in definite range? other question ask: how possible deactivate textinput depending on value of previous inputs or set focus appropriately? think these standard tasks in gui-programming , i'm bit confused on how manage these in kivy - appreciated!


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