Change button text value for on_press event in Kivy -


my application has single button text value '2'. want change text value 100 on on_press event

my attempt:

#!/usr/bin/kivy import kivy kivy.require('1.7.2')  random import random random import choice kivy.app import app kivy.lang import builder kivy.uix.screenmanager import screenmanager, screen kivy.uix.gridlayout import gridlayout kivy.uix.button import button  r1c2=random() builder.load_string(""" <highest>:     r1c2: str(2)     gridlayout:         cols: 1         button:             text: root.r1c2             on_press: root.new() """)  class highest(screen):     def new(self):         r1c2=str(100)   # create screen manager sm = screenmanager() sm.add_widget(highest(name='highest'))  class testapp(app):      def build(self):         return sm  if __name__ == '__main__':     testapp().run()

error: currently, nothing happens when button pressed. please help

you should using kivy properties available. see kivy.properties more information.

add import access string property: 

from kivy.properties import stringproperty

and highest class should be:

class highest(screen):     r1c2 = stringproperty(str(2))      def new(self):         self.r1c2 = str(100)

at initialization r1c2 value equal '2'. when function new() called value of r1c2 become '100'. button text bind string property r1c2 automatically change.

you don't need r1c2=str(2) in builder string. 

builder.load_string(""" <highest>:     gridlayout:         cols: 1         button:             text: root.r1c2             on_press: root.new() """)

Comments

Post a Comment

Popular posts from this blog

java - Spring Data JPA: Why findOne(id) executing delete query internally? -

i have 1 application using @manytomany annotation link 2 different entities 1 parent entity. not sure if have implemented properly. when execute .findone() on parent entity's repository find it, @ first fetch data along executing delete queries internally delete record mapping table (a table jpa creates after adding @manytomany annotation.). following generated sql queries , code snippet: java class @entity @table(name = "inventory") public class inventory { @id long id; // many other properties @manytomany(fetch=fetchtype.lazy) private list<stream> streams; @manytomany(fetch=fetchtype.lazy) private list<subject> subjects; } there no other annotation i've put in stream , subject entity class link inventory class. when run app, create following tables: inventory stream subject inventory_stream inventory_subject (inventory_stream , inventory_subject, 2 tables created automatically, don't k...
Read more

python - Mongodb How to add addtional information when aggregating? -

i beginner , wrote line pipeline works, wanna add other information output, screen name , or number of tweets.i tried add under $group gave me syntax error everytime here pipeline: def make_pipeline(): # complete aggregation pipeline pipeline = [ { '$match': { "user.statuses_count": {"$gt":99 }, "user.time_zone": "brasilia" } }, { "$group": { "_id": "$user.id", "followers": { "$max": "$user.followers_count" } } }, { "$sort": { "followers": -1 } }, { "$limit" : 1 } ]; i using on example : { "_id" : objectid("5304e2e3cc9e684aa98bef97"), "text" : "first week of school on :p", "in_reply_to_status_id" : null, "retweet_count" : null, ...
Read more

java - Incorrect order of records in M-M relationship in hibernate -

Image
i have 4 records in bridge table in mysql database. using @manytomany in hibernate, accurate order of employees incorrect incorrect of projects. following required material figure out doing mistake. this source. @entity @table(name="project") public class projectbean { @id @generatedvalue @column(name="project_id") private int projectid; @column(name="title") private string projecttitle; @manytomany(mappedby="projects") private collection<employeebean> employees; public projectbean() { employees = new arraylist<employeebean>(); } //getters & setters } @entity @table(name="employee") public class employeebean { @id @generatedvalue @column(name="employee_id") private int employee_id; @column(name="first_name") private string ...
Read more