Kivy TextInput: long text overflows textinputs border

[Giù sé]

I noticed that with single line textinputs (multiline: False) long texts will overflow and the last letter typed in will not be visible. I see the issue has also been raised on stackoverflow (here) and it seems to be a Kivy bug. Has this been solved by any chance (or has a bug report been opened at all)?

To me, it seems to be an issue of the cursor. When the text overflows, if I press the right arrow (i.e. move the cursor right) I am then able to read the whole text. So the text does fit into the textinput, it is the cursor that seems to misbehave.

Here a minimal code to reproduce the issue:

from kivy.app import App

from kivy.core.window import Window

from kivy.lang import Builder

from kivy.uix.gridlayout import GridLayout

from kivy.uix.screenmanager import Screen, ScreenManager

class MainGrid(GridLayout):

    pass

kv = Builder.load_string(

'''

MainGrid:

<MainGrid>:

    size_hint: 1, 1

    StackLayout:

        size_hint: 1,1

        TextInput:

            size_hint: 1, 1

            multiline: False

''')

class TrialApp(App):

    def build(self):

        return kv

if __name__ == "__main__":

    TrialApp().run()

[Elliot Garbus]

You can report this bug here: https://github.com/kivy/kivy/issues

 

Here are some possible work arounds:

• Using horizontal padding keeps the cursor in the box, but the behavior of the last character is strange.
• Avoid the problem by limiting the number of characters

 

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.textinput import TextInput
from kivy.properties import NumericProperty

kv = """
BoxLayout
    orientation: 'vertical'
    padding: 20
    Label:
        text: 'TextInput Test'
        font_size: 40
    BoxLayout:
        size_hint_y: None
        height: 48
        Label: 
            text: 'No Padding'
        TextInput:
            size_hint: .8, None
            pos_hint: {'center_x': .5}
            height: '48'
            font_size: 20
            multiline: False
    BoxLayout:
        size_hint_y: None
        height: 48
        Label: 
            text: 'Padding'
        TextInput:
            size_hint: .8, None
            pos_hint: {'center_x': .5}
            height: '48'
            font_size: 20
            multiline: False
            padding: 20, 10
    BoxLayout:
        size_hint_y: None
        height: 48
        Label: 
            text: 'Use a filter to limit characters'
        CharLimitTextInput:
            size_hint: .8, None
            pos_hint: {'center_x': .5}
            height: '48'
            font_size: 20
            multiline: False
            max_characters: 10
            input_filter: self.char_limit
    Label:      
"""


class CharLimitTextInput(TextInput):
    max_characters = NumericProperty('20')

    def char_limit(self, substring, undo):
        if len(substring) + len(self.text) <= self.max_characters:
            return substring
        if len(substring) + len(self.text) > self.max_characters:
            c = int(self.max_characters - len(self.text))
            return substring[0:c]

class TrialApp(App):
    def build(self):
        return Builder.load_string(kv)

TrialApp().run()

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