capitalize only the first letter in a text input area

[husam alkdary]

it's possible to capitalize only the first letter in a text input area using this method 

class CapitalInput(TextInput):
    def insert_text(self, substring, from_undo=False):
        s = substring.upper()
        return super(CapitalInput, self).insert_text(s, from_undo=from_undo)

this function capitalize  all the text but I want only the first litter 

[ZenCODE]

Try

    s = substring.title()


[husam alkdary]

it's not work

the idea of this method is to make the changes instantaneity for every chart immediately when we typed in the widget

that's the big problem also I tried all the suggestion in here  https://stackoverflow.com/questions/1549641/how-to-capitalize-the-first-letter-of-each-word-in-a-string

but my Idea is to make the textinput change immediately only the first litter ?
also may make the textinput widget request the upper case litter in the keyboard ? 

[Elliot Garbus]

class CapitalInput(TextInput):
    def insert_text(self, substring, from_undo=False):

        s = substring.upper() if len(self.text) == 0 else substring
        return super(CapitalInput, self).insert_text(s, from_undo=from_undo)

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[husam alkdary]

first I modified you code to capitalize the first letter in each line 

class CapitalInput(TextInput):
    def insert_text(self, substring, from_undo=False):

        s = substring.upper() if self.cursor_col == 0 else substring
        return super(CapitalInput, self).insert_text(s, from_undo=from_undo)

 

this works fine only if the interred value is string but if for example is space it will not capitalize the first letter after the space

what should I do to ignore that if is possible

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[Elliot Garbus]

Here you go:

 

class CapitalInput(TextInput):
    def __init__(self, **kwargs):
        self.new_line = False
        super().__init__(**kwargs)

    def insert_text(self, substring, from_undo=False):
        if self.cursor_col == 0:
            self.new_line = True
        if self.new_line and substring.isspace():
            new_text = substring
        elif self.new_line and not substring.isspace():
            new_text = substring.upper()
            self.new_line = False
        else:
            new_text = substring
        return super().insert_text(new_text, from_undo=from_undo)

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[Robert Flatt]

What should I do if there are two spaces at the beginning of a line?  ;)

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[Elliot Garbus]

Take a closer look 😊 it’s covered.

 

At col == 0, the new_line flag is set indicating we are on a new line.  

new_line  stays True until a non-white space character is encountered. There can be any number of leading white space characters.

 

There is a possible open issue.  If after you have typed a few lines, if you move the cursor into some leading spaces (not column 0) and start typing, it will not be capitalized.

 

An executable to play with:

 

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

class CapitalInput(TextInput):
    def __init__(self, **kwargs):
        self.new_line = False
        super().__init__(**kwargs)

    def insert_text(self, substring, from_undo=False):
        if self.cursor_col == 0:
            self.new_line = True
        if self.new_line and substring.isspace():
            new_text = substring
        elif self.new_line and not substring.isspace():
            new_text = substring.upper()
            self.new_line = False
        else:
            new_text = substring
        return super().insert_text(new_text, from_undo=from_undo)

if __name__ == '__main__':
    kv = """
BoxLayout:
    orientation: 'vertical'
    Label:
        text: 'Test Capital Input'
    CapitalInput:
        id: ci
        hint_text: 'Enter text'
    GridLayout:
        cols: 3
        Label:
            text: 'cursor: ' + str(ci.cursor)
        Label:
            text: 'cursor_col: ' + str(ci.cursor_col)
        Label:
            text: 'cursor_row: ' + str(ci.cursor_row)
        Label: # placeholder
        Label:
            text: 'cursor_pos: ' + str(ci.cursor_pos)
    """


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


TITestApp().run()

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[Robert Flatt]

You are a star :)

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[Elliot Garbus]

LOL

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[husam alkdary]

what's the mean of this 

isspace() , new_line

I didn't find any in the kivy doc
!!

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[husam alkdary]

can the code to approved to deal with all not string type not only space 
maybe using type function

On Saturday, April 11, 2020 at 5:08:51 AM UTC+2, Elliot Garbus wrote:

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[Elliot Garbus]

Isspace() is a python string method. https://docs.python.org/3/library/stdtypes.html#string-methods

new_line is an instance variable that I created.  This variable is created as in instance variable rather than a local variable because it must retain the value across multiple method calls.

Here is a tutorial on oop in python: https://realpython.com/python3-object-oriented-programming/

 

Here are some line by line comments:

 

class CapitalInput(TextInput):
    def __init__(self, **kwargs):
        self.new_line = False  # create an instance variable.  When new_lins is true it means we have found a new line, but not yet capitalized a letter.
        super().__init__(**kwargs)

    def insert_text(self, substring, from_undo=False):  # insert_text is called on every character entered
        if self.cursor_col == 0:
            self.new_line = True  #  if we are on col 0, set new_line True.  We are on the start of a new line
        if self.new_line and substring.isspace(): 
            new_text = substring  # if  new line is True and the substring is whitespace, enter the whitespace into the TextInput
        elif self.new_line and not substring.isspace():
            new_text = substring.upper()   # if new_line is true and the character is not whitespace, uppercase the character, and set new_line false
            self.new_line = False               # new_line will stay false until col == 0
        else:
            new_text = substring               # if new_line is false, insert the substring into the TextInput.
        return super().insert_text(new_text, from_undo=from_undo)

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