Changing window size seems to affect string manipulation

[ST]

Hello, I am puzzled and I would like to ask for your help.

I have a program where it adds a suffix to an entered text.

However, it somehow only works for strings that are less than 49 characters long.

I've created a minimal working example (see attachment or end of post).

The program works like this:

1. User enters text into textbox, adjusts window size, then presses button
2. Add '_suffix' to the end of the text string
3. Remember window size
4. Change window size to (400,400) and display popup
5. User presses 'Print' -> print modified string
6. User presses 'Cancel' -> close popup, return window to original size

For example, 

    input: 123456789012345678901234567890123456789012345678

    output: 123456789012345678901234567890123456789012345678_suffix

However, for some reason, the suffix is not added for strings more than 48 characters long.

I found that deleting 

        # set popup window size

        Window.size = (400, 400)

can get rid of this issue, but I want to keep this feature.

I've tried to increase the wait time using Clock, but it didn't work.

I found that double-clicking the 'Open popup' button before the popup is opened

causes this error to go away, if the window size is not changed.

But I can't understand why.

Any help is appreciated. Thanks!

Below is the code:

test.py

from kivy.app import App

from kivy.clock import Clock

from kivy.core.window import Window

from kivy.lang import Builder

from kivy.properties import NumericProperty, ObjectProperty, StringProperty

from kivy.uix.floatlayout import FloatLayout

from kivy.uix.popup import Popup

Builder.load_string("""

#:kivy 1.11.1

<MainScreen>:

    input_text: input_text.text

    BoxLayout:

        orientation: 'vertical'

        TextInput:

            id: input_text

            

        Button:

            text: 'Open popup'

            on_release: root.do_stuff()

<PopupScreen>

    BoxLayout:

        orientation : 'vertical'

        size: root.size

        pos: root.pos

        

        Label:

            size_hint_y: 0.3

            text: 'Message'

                

        Button:

            size_hint_y: 0.5

            text: 'Print'

            on_release: root.print_text()

            

        Button:

            size_hint_y: 0.2

            text: 'Cancel'

            on_release: root.cancel()

""")

class PopupScreen(FloatLayout):

    print_text = ObjectProperty(None)

    cancel = ObjectProperty(None)

class MainScreen(FloatLayout):

    Window.size = (600, 400)

    

    input_text = StringProperty(None)

    

    def dismiss_popup(self):

        self._popup.dismiss()

        Window.size = self.current_size # return window to adjusted size

    def print_text(self):

        print("output: " + self.input_text)

    def open_popup(self):

    

        # remember main screen window size

        self.current_size = Window.size

        

        # set popup window size

        Window.size = (400, 400)

        # open popup

        content = PopupScreen(print_text=self.print_text, cancel=self.dismiss_popup)

        self._popup = Popup(title="Popup", content=content)

        

        print("check3: " + self.input_text)

        

        Clock.schedule_once(lambda dt: self._popup.open(), 0.5)

        

    def add_suffix(self):

    

        # refresh text (to prevent _suffix_suffix when rerun without editing text)

        self.input_text = self.ids.input_text.text

    

        # add suffix

        self.input_text = self.input_text + '_suffix'

        print("check2: " + self.input_text)

        Clock.schedule_once(lambda dt: self.open_popup(), 0.5)

    def do_stuff(self):

        '''Action when "Run" button is pressed'''

        

        #do stuff here

        

        print("check1: " + self.input_text)

        self.add_suffix()

# define Base Class of Kivy App

class TestApp(App):

    def build(self):

        return MainScreen()

# run program

if __name__ == '__main__': 

    TestApp().run()

[Elliot Garbus]

There were are few things I changed below, the issue was related to a line in the kv file..

input_text: input_text.text 

 

 

from kivy.app import App
from kivy.clock import Clock
from kivy.core.window import Window
from kivy.lang import Builder
from kivy.properties import NumericProperty, ObjectProperty, StringProperty
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.popup import Popup

Builder.load_string(

"""

#:kivy 1.11.1

<MainScreen>:

    #input_text: input_text.text  # Not sure what you are trying to do here... 

)

(FloatLayout):
    input_text = StringProperty('')  # removed None

    #Window.size = (600, 400)        # Moved to build, this code was not in a method.
    def dismiss_popup(self):
        self._popup.dismiss()
        Window.size = self.current_size  # return window to adjusted size

    def print_text(self):
        print("output: " + self.input_text)

    def open_popup(self):
        # remember main screen window size
        self.current_size = Window.size

        # set popup window size
        Window.size = 400, 400

        # open popup
        content = PopupScreen(print_text=self.print_text, cancel=self.dismiss_popup)
        self._popup = Popup(title="Popup", content=content)

        print("check3: " + self.input_text)

        Clock.schedule_once(lambda dt: self._popup.open(), 0.5)

    def add_suffix(self):
        # refresh text (to prevent _suffix_suffix when rerun without editing text)
        self.input_text = self.ids.input_text.text

        # add suffix
        self.input_text = self.input_text + '_suffix'

        print("check2: " + self.input_text)

        Clock.schedule_once(lambda dt: self.open_popup(), 0.5)

    def do_stuff(self):
        '''Action when "Run" button is pressed'''

        # do stuff here

        print("check1: " + self.input_text)

        self.add_suffix()

# define Base Class of Kivy App
class TestApp(App):

    def build(self

):
        Window.size = 600, 400  # moved here
        return MainScreen()

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[ST]

Dear Elliot Garbus,

Thank you for the quick response! It worked perfectly.

I realized I had ObjectProperty and StringProperty all mixed up, hence the line:

input_text: input_text.text

I've also revised my code to get rid of the self.ids method, using ObjectProperty instead, as recommended in the Kivy Programming Guide.

I feel I have gained a better understanding of the Kivy language. Thank you so much.
 

revised code:

from kivy.app import App

from kivy.core.window import Window

from kivy.lang import Builder

from kivy.properties import NumericProperty, ObjectProperty, StringProperty

from kivy.uix.floatlayout import FloatLayout

from kivy.uix.popup import Popup

Builder.load_string("""

#:kivy 1.11.1

<MainScreen>:

    input_text: input_text

    input_text = ObjectProperty(None)

    

    def dismiss_popup(self):

        self._popup.dismiss()

        Window.size = self.current_size # return window to adjusted size

    def print_text(self):

        print("output: " + self.modified_text)

    def open_popup(self):

    

        # remember main screen window size

        self.current_size = Window.size

        

        # set popup window size

        Window.size = 400, 400

        # open popup

        content = PopupScreen(print_text=self.print_text, cancel=self.dismiss_popup)

        self._popup = Popup(title="Popup", content=content)

        self._popup.open()

        

    def add_suffix(self):

    

        # add suffix

        self.modified_text = self.input_text.text + '_suffix'

        self.open_popup()

    def do_stuff(self):

        '''Action when "Run" button is pressed'''

        

        # do stuff here

        self.add_suffix()

# define Base Class of Kivy App

class TestApp(App):

    def build(self):

        Window.size = 600, 400

        return MainScreen()

# run program

if __name__ == '__main__': 

    TestApp().run()

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