Kivy threading window import Window from threading import Thread Resolution = Usually bind list should contain all Kivy properties used in getter method. RESULTS. " You can (and frequently should) reuse MDDialog widgets, actually. image('mysprite. Two Flask Applications at same time. You create an instance of your specific app class and then, when you are ready to start the application’s life cycle, you call your instance’s App. def run(self): engine = OpenGL related operations (widget, canvas, property manipulation etc. For plotting there is Graph in the Garden, which will make your life easier if you don't want to play with graphic instructions alone - it's a nice practice though. pop_up_text. If you are new to threading. Running multiple Kivy apps at same time I am making an app in kivy for that i am using linux. Using the Thread will work. Related. Cannot reproduce this with a simple click to display Popup, but using some threading shows it up Kivy is an open-source Python framework for developing cross-platform graphical user interfaces (GUIs). open() (kivy) 2. The solution is to schedule callbacks with kivy's Clock that will call a function from kivy's main thread and do the work for you. screenmanager import ScreenManager, Screen from kivy. I suspect it is because they can't coexist in one thread process, so I tried Multithreading, but the app still crashes. properties import ObjectProperty from kivy. When used, the kivy clock does not block while idling. Use publisher/consumer model as described here. I'm trying to create a small GUI with kivy. When the client receive a message I want to display it on my kivy screen. If the content of your loop executes fast, you can just use Kivy's Clock object to run your function instead of looping: Is it possible to have a main control/adapter thread that opens a thread for kivy and a thread for model operations? The @mainthread is not necessarily the main thread but the thread that creates the kivy app to run. So that line will never be drawn. This example shows us how to use Clock or the mainthread decorator to perform these actions, and how to use threading events to stop hanging threads when the app is about to close. The here's the code I have used ObjectProperty to trigger update both label:text and the Image:Texture But only the Label:text Kivy is deisgned such that only the main thread in a Kivy app can modify the GUI. png') You can also load an image from a url:: # # Try to use pygame as our first choice for loader # from kivy. But the line in another widget which is not on the screen. 153 7 7 bronze badges. 3. I thought I could use threading on the popup but then the main app would still freeze and I assume best practice would be to have the heavy process on the thread and the popup on the from threading import Thread # the function that the button executes def button_press(): # create the thread to invoke other_func with arguments (2, 5) t = Thread(target=other_func, args=(2, 5)) # set daemon to true so the thread dies when app is closed t. def __init__(self,name): threading. Viewed 5k times 2 . clock import Clock def animate_image(self): anim = Animation() anim. current = 'menu' line and move it to, for example the thread_notice function. Modified 7 years, 5 months ago. from kivy. :: with safe: foo() Any use cases besides compacting code? ''' __all__ = ('SafeMembrane', 'InteractiveLauncher') import inspect from threading import Thread, Event from kivy. Basically, when I click a button and the screen switches to the next one, I want to launch a thread, and when I click the 'back' button, the thread should stop. Kivy does not play gif in Popup Kivy multi-threading and update screen. How to run two process at once using kivy. I'm trying to implement threading in my kivy app. daemon = True # start the thread t. clock import Clock main_kv = """ <CustomLabel>: size_hint: (None, None) size: kivy app freezes when using threading. loader import Loader image = Loader. Also, all the scheduling and canceling methods are fully thread safe and can be safely used from external threads. run() method. The async library to use is selected with How to make Kivy app run inside a thread? 0. If you want to try something different you can use kivy clock # dt means delta-time def my_callback(dt): pass # call my_callback as soon as possible (usually next frame. One important thing to note here is the way packages/classes are laid out. . ids. Kivy: Popup is blocked by main thread. __init__(*args, **kwargs) Clock. uix. This is useful for handling time-consuming tasks like network requests, file I/O, and complex These are my numpy functions combined with the Thread module. 1 - KivyMD 0. 4 - Kivy 1. kivy run_on_ui_thread crash. So in my case the solution is probably to have the code in the thread add a Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I need to run a function from a python fileA which will update the label in the kivy app. Kivy: Popup not displaying. The popup_B runs together with a method in a thread otherwise Kivy does not show the popup (locking GUI). 6. text property in widgets that has this property i. mylabel = Label(text=<string>) mylabel. core. I've been stuck in this for days. These Baser widgets are produced from a loop inside the python code since the number of widgets produced and information they show and hold depend on the result from the I am using kivy for UI. 0. texture = texture1 with a Clock. Thread. The issue now is that I need to find a way for each process to update the original screen. user. The background thread updates the texture in the Image Widget main class. Here's an example from that link modified to use separate threads: from kivy. textinput import TextInput from kivy. base import EventLoop from kivy. class threading in kivy example. I want to disable buttons until Time_consuming function finishes, and then enable button again. Here is a modified version of your code that uses threading. text = <string 2> What you are asking is from kivy. Kivy allows any thread "read-only access," so any thread can read from the GUI widgets and variables. deamon = True Why bother with a Thread if you are going to wait for it anyway? You could just call send_data(self. the kivymd app freezes when adding a large number of widgets. start() def other_func(a, b): # your code here Kivy needs to be in it's own thread. How to stop a thread after the task is finished in python? Hot Network Questions What do "messy" weapons I modified your example a bit. I'm fairly new with Kivy and kivyMD, and even more with threading and shared resources. 0, all the events scheduled for the same frame, e. The only exception to this is scheduling a callback for execution with Clock, this is a thread-safe operation. I had to make a few changes just to get your code to run: from kivy. How to fix kivy not responding while give it another task. import threading import Queue from kivy. Regarding the separation, just make a new module to put the class there and import it wherever you want to use it. Try start the thread in the init method instead. Thread(target = popup, args = (boxTitle, boxLabel)) t2 = threading. Viewed 1k times 5 I'm relatively new to kivy and am having an intermittent issue with certain images and button images not loading correctly, even when the same image loads correctly for other widgets using the same image. event import EventDispatcher import time import threading class Count: """ This is the external class we want to bind attributes from, this could be an imported module also. I managed to get the thread issues working, but then I found that the threads (up to 4) were all running on 1 core (not 4). Just create the table, fetch the data in another thread and set the row_data attribute to the fetched data. After a LOT of Google searching, the only thing I've actually found that approaches being useful, is an informative note here on StackOverFlow. Thread(target=app. Beginning with 1. Then after the scan is completed, it again starts scanning. all the events scheduled in the same frame with a timeout of 0, well be executed in the order they were scheduled. How to make Kivy app run inside a thread? 0. ). load_string(""" <TextWidget>: BoxLayout: orientation: 'vertical' size: root. How to run a Method on the exit of a kivy app. What am I doing wrong? kv file: BoxLayout: Button: on_press: threading. This if done properly and for the correct use case can be very effective in improving performance. open() (kivy) 1. The Clock now has a ClockBaseBehavior. New in version 1. by clicking on the button named button it should launch the popup on another thread with a progress bar that evolves after 3 seconds. 7. – John Anderson I am trying to make a application using Kivy that use threading. The App class is the base for creating Kivy applications. Nothing in Kivy should do blocking IO. This example shows us how to use Clock or the mainthread decorator to perform these actions, and how to use threading events to stop hanging threads when the app is about to close. Hot Network Questions Covering a I have a kivy application in python which uses some threads. But doing this is usually bad practice (doing blocking calls without a thread, or waiting for the thread to finish in a blocking way, which is equivalent), what you want, instead of waiting for the task to be done before proceeding, is to As @JohnAnderson mentioned in the comments, the solution for kivy is to use threading. network. By the way in the thread I suggest making the target: Threading and Callback Order¶. init_completed) def init_completed(self, dt): t = Thread(target=animate_image, args=(self)) t. kivy glitch with images and threading. clock import Clock from kivy. clock import Clock, _default_time as time # ok, no better way to use the same clock as kivy, hmm from kivy. Today, I fill in the 3 MDGridlayouts (sbgridfamily, sbgridgender, sbgridspecies) sequentially with SmartTileWithLabels. lang import Builder Builder. Here is an example of an app I created that uses threads: from kivy. Kivy unresponsive and unable to change text in a textbox. urlrequest import UrlRequest req = UrlRequest (url, on_success, on_redirect, on_failure, on_error, on_progress, req_body, req_headers, chunk_size, timeout, method, decode, debug, file_path, ca_file, verify) This method is intended to be used in the main thread, and the callback will be dispatched from the same thread from which you’re calling. b. I suspect it is because they can't coexist in one thread process, so I tried Multithreading, but the app still crashes. username. So far I have tried with: Using mutex = threading. Kivy Popup misbehaviour when called from inside 'on_enter' 1. schedule_once() (or just add the @mainthread decorator to that new method). How to kivy app freezes when using threading. Check here for info on python threading in a I'm having trouble with the threading in Python and Kivy. Events, you can learn more here: How to Use an Event Object In Python; A new event can be created and then shared between threads, for example: it's not obvious to me which graphics operations have to be done in the Kivy thread Nothing is safe from outside mainthread, you literally can not do anything safely from another thread. You even do Displaying something in kivy while a process is running background; Kivy: how to display a widget while waiting for another one to be displayed t1 = threading. g. Label, TextInput and some others. 0. Add a comment | Your Answer The goal is to have one thread that constantly polls the MIDI input and routes events to pyfluidsynth, while a conventional Kivy app is running in parallel. I have updated the code to be able to use threads instead of processes, which works. You cannot do any kivy instructions outside of the main thread, which means you cant run sendNotice on a diffrent thread becuase it has kivy code in it if my_big_chunk_of_code() takes time then remove the kv. And replace the self. I've tried on two different machines running Solus with Python 3. Python kivy and multiprocessing bug. When I try to end a thread with the function . What I know is that Kivy GUI can not update until my func_call has ended, but in my case, it can take hours to end. 0``, multiple clocks with different behaviors. These are my numpy functions combined You can use my widget the same way you use ProgressBar, except you have to call set_value(value) whenever you want to set one (check the example I've provided). __init__(self) self. 0; OpenGL related operations (widget, canvas, property manipulation etc. source code: https://github. clock import Clock import time, threading class PopupBox(Popup): pop_up_text = ObjectProperty() def update_pop_up_text(self, p_message): self. Struggling to implement threading in kivy app. 11. I am wrote a piece of python code that handles multiple processes and it works great, but I am trying to add a Kivy based display to this code. 10. 0 How to make Kivy app run inside a thread? Load 7 more related questions Show fewer related questions Sorted by from kivy. create_lifecycle_aware_trigger`) for scheduling callbacks that raise a Kivy multi-threading and update screen. Python tkinter popup not opening prior to subthread. Thread I'm trying to make a chat application based on client-server. If the event is not processed in Kivy's thread because the app stopped, the second thread may block forever hanging the application as it exits. In most cases, you subclass this class and make your own app. Trying to draw a line with Kivy and threading. Draw, you do that with a new MyWidget object, and not the one you returned in your build method. Similarly on line 5: from kivy. schedule_once() call. i am getting a problem to update the progress bar gui using from kivy. press() There is no way to update the user interface or create widgets in a thread as kivy doesnt garuntee stable behaviour in this way. Also the GUI gets garbled. text) and be done with it. label import Label from kivy. If you return True it will cause a dispatch which one should do when the property value has changed, but keep in mind that the property could already have dispatched the changed value if a kivy property the alias property is bound was set in the setter, causing a second dispatch if the setter returns True. size Button: from kivy. In Summary, I want my code to be ran when I press a button, and my code execution to not be hindered. name=name. Modified 7 years, 4 months ago. Concurrently running a You must specify a default loading image when using the loader:: from kivy. import threading from kivy. In Kivy you can easily access e. The issue is that attempts to modify the GUI from a seconday thread fail SILENTLY. Thread(target = time_consuming_method) t1. schedule_once(self. Core. Prevent pyttsx3 from freezing the GUI. Running Kivy App inside another python program. I think it's an issue with at the end of this video u will have a general understanding of why we use threads in Kivy and how to use them. button import Button from kivy. Kivy and Flask threads blocking each other in Python2. 1 Updating Kivy Label Using Threading. test()). Ask Question Asked 8 years, 10 months ago. label import Label. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Kivy and Python threading - how get data between them. How to fix kivy not responding I'm trying to use numpy-based functions corroborate with Kivy, but once these functions are called on_enter a Kivy Screen, the app freezes, and consumes so much CPU and RAM. Nothing in Kivy should sleep. Consequently, we provide a API (:meth:`CyClockBase. Because when you do MyWidget(). async_tick() and ClockBaseBehavior. While the complexity of the thread looks manageable, Sooner or later you will be bitten with buggy non deterministic behaviour and or in this code I'm making a simple counter that counts and updates the label lets say 0-9 and it should update the label everytime but the app freezes and only updates when the I am wrote a piece of python code that handles multiple processes and it works great, but I am trying to add a Kivy based display to this code. compat import queue from threading import Thread class _Worker (Thread): '''Thread executing tasks from a given tasks queue ''' def I've tried adding @mainthread to my create_grid function as suggested here: Avoid : Cannot create graphics instruction outside the main Kivy thread but it's still freezing the app. properties import NumericProperty, ObjectProperty from kivy. app import App from kivy. 8. t1 = threading. This will automatically update both circular and text progression. It works fine, however the loading time is quite long (~5 sec. async_idle() coroutine method which is used by the kivy EventLoop when the kivy EventLoop is executed in a asynchronous manner. Kivy multi-threading and update screen. Kivy is built on top of the OpenGL graphics engine, which provides fast and responsive graphics Although most of this answer is both factually accurate and useful, one particular statement is simply untrue: "You cannot reuse an MDDialog anyway. To actually use multi-threading, put the guts back into the coll() method, so that it is actually run in a new thread. Event is a thread-safe boolean variable flag that can be either set or not set. Kivy > Threading and using the Spinner 1 KivyMD//Python How to create a loading dialog box (pop-up) that displays a spinning wheel while the code runs another function in the background I'm trying to use numpy-based functions corroborate with Kivy, but once these functions are called on_enter a Kivy Screen, the app freezes, and consumes so much CPU and RAM. This example shows us how to use Clock or the mainthread Kivy multi-threading and update screen. dismiss() method to hide a displayed dialog and the MDDialog. To optimize this loading, I ok, I can ,look closer. properties import ListProperty from kivy. Networking: Kivy provides support for networking, allowing developers to create networked applications that can I'm trying to build the most basic Hello World kivy apk with buildozer and it keeps failing to build. So when ever I face a problem I try to start from the very basic level like I can use this threading system in tkinter in any manner now but initially I started with only a simple number counter that will change the label everytime when I had this code which uses threading but at some point, the GUI freezes (after I pressed the button). This allows you to create responsive and interactive applications that perform well even when executing long-running tasks. ) Experimental async support has been added in 2. utils. Follow answered Oct 5, 2022 at 3:03. E. Initially, I had created a code using Kivy, a Python GUI library, and threading. Kivy provides a thread-safe API that enables you to spawn new threads and safely update the user interface from those threads. boxlayout import BoxLayout from kivy. loading_anim) class LoadingWindow(Screen): def __init__(self, *args, **kwargs): super(). But if you've called a function with multiple lines, and in one of the lines Open source UI framework written in Python, running on Windows, Linux, macOS, Android and iOS - Working with Python threads inside a Kivy application · kivy/kivy Wiki That is have Kivy run in the main thread then dispatch other tasks to another thread. I can successfully start the thread but can not end it. . 104. 0 kivy app freezes when using threading. Instead of Then you should use the threading, but the parts that create GUI widgets (or display them) should be moved to another method and that new method called using Clock. I think you just need to remove the from that method, so that the target is set to the process_some_data method and not its I'm completely a newbie to kivy and have been learning python for only last one and half month, without any programming knowledge. Kivy GUI (Python) falling into a segmentation fault when trying to update the screen. popup import Popup from kivy. Thread, as follows. Please help me with it!! Client Class: Kivy multi-threading and update screen. As python is not able to run these threads on different Cores due to the Global Interpreter Lock, I would have liked to try to use PyPy for it and see if I can make the threads run faster of different cores since PyPy is different and offers stackless (what ever that is?. Here is what I I do not understand how to combine multiprocessing with Kivy, a Python GUI library, so please help me on this. utils import deprecated def safeWait (dt): EventLoop. The threading technique is something I do a ton of in my applications and I have many in each application. properties import Threading and Callback Order¶. 2. gridlayout import GridLayout from kivy. popup import Popup import time, threading kv = ''' #:import hex kivy. Despite this unfavorable limitation, a companion thread would suffice for other non-kivy event processing and interacts with kivy UI through Threading and Callback Order-----Beginning with 1. start() t2. text = p_message class ExampleApp(App): def show I do not understand how to combine multiprocessing with Kivy, a Python GUI library, so please help me on this. all the events scheduled in the same frame with a ``timeout`` of ``0``, well be executed in the order they were scheduled. Improve this answer. start() Button: on_press: app. 5. The Result Screen then populates its GridLayout widget with widgets called 'Basers'. Run Flask application with Jython. progressbar import ProgressBar from kivy. Does somebody have some information to Your modified code still is not really using multi-threading, because your new coll() method simply schedules the another() method to run back on the main thread. triggering Popup. Can someone explain to me, why there are 2 threads (Thread-1 & Thread-2) active when I have only set one thread : (my_thread)? from kivy. Kivy - automatically start a method from popup. Default Clock ^^^^^ The default clock In your run_thread() method, the line:. factory import Factory from kivy. However, while it almost solves my problem, the answer assumes I know more about Kivy than I do; I don't know how Threading and Callback Order¶. Clock intervals, but nothing seems to work. author: dessant; kivy: >= 1. Kivy widgets connected unexpectedly. I have looked into threading and the Kivy. How to correctly use kivy graphics context instruction. Kivy is based on Python and uses Sphinx for documentation, so the documentation for each class is in the actual file. This is for system stability. It can be shared between threads and checked and set without fear of a race condition. Flask App that uses another standalone app? 7. 1. All Kivy GUI updates are done from the main thread, so if you block it, nothing in the GUI will update. 3,296 views. button import Button class This example shows us how to use Clock or the mainthread decorator to perform these actions, and how to use threading events to stop hanging threads when the app is about Compare Working with threads in kivy. Also, all the Kivy offers now, since ``1. It is designed to make it easy to create applications that can run on multiple platforms, including Windows, macOS, Linux, iOS, and Android. Often, the Popup displays very badly. Personally, when I use a second thread, I use a queue for the inter-thread comm as follows: from Queue import Queue class KivyQueue(Queue): ''' A Multithread safe class that calls a callback whenever an item is added to the queue. #-*- coding: utf-8 -*- from kivy. However, you can implement a thread termination mechanism using a flag that the thread checks periodically to decide whether to exit. But kivy gives me an Could be re-written with a context-manager style i. ) should be done only in the main thread. there is a Time_consuming function and when it runs, kivy ui will goes in black, so I used Threading. lang import Builder from kivy. Lock() to lock the thread with the popup_B: the popup_A appears over the popup_B. For example, in python fileA I am running a scanner function which basically first init the sensors and then start scanning. I've some problems with python(threading) and kivy: Here is some code: import kivy import threading import time from kivy. get_color_from_hex Button: text: 'doit' on_release: In Python, threads cannot be killed directly due to the design of the threading library and the underlying complexities of safely terminating a thread that might be holding resources or locks. Share. label import Label from time import sleep import threading class MyApp . open() method to redisplay a hidden dialog. com/TirrouOussama Your modified code still is not really using multi-threading, because your new coll() method simply schedules the another() method to run back on the main thread. 1. Creating thread anywhere in Kivy app makes the whole app wait for end of the thread function, so there is no difference when using threads or not. GitHub Gist: instantly share code, notes, and snippets. e. I need some sort of parallel process, or else the Kivy UI freezes for as long as the midi poll while loop is running. The problem is that the texture variable gets updated but is not displayed in the kivy Gui app. 4 and I'm sure I have all the dependencies, I keep getting the same error: Developing a detailed game using Kivy and using popups for some player interaction. A threading. Instead run your ui on your main thread and run your other app functions on a secondary thread. George Wilhelm Hegel George Wilhelm Hegel. process_some_data()) runs the process_some_data() method, then sets the target of the created thread to the return of that method. So I am believe that I need to change over to use processes instead of threading (around line 582). behaviors import Python 3. You can solve this two ways. Just call the MDDialog. dismiss() in a method which didn't call Popup. Pop up Kivy displaying while a process is running in background. Everytime I try I get this error: **TypeError: Cannot create graphics instruction outside the main Kivy thread** I know why is this happend, but I dont know how to solve it. Think of it as your main entry point into the Kivy run loop. clock import Clock import sys, threading, os, time from socket import * class Out_Come kivy app freezes when using threading. I have updated the code to be Kivy supports multithreading, which allows developers to run multiple tasks concurrently. 2 How do I update the GUI from another thread? using python. The function I am trying to call with the thread does operations outside of the kivy gui like recognising speech with the speech recognition module. Basically a never ending loop. Kivy widget generation very slow. kivy app freezes when using threading. another thread may request a callback in kivy's thread and then process some result. 0, 'y': ButtonY}, on_press=start) Or if you have any suggestions how this can be better done or how it should be done i would really appriciate it im really stuck on this I have to divide long tasks into threads. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company How to implement threading when building buttons with Kivy in my class And a separate thread on buttonpress when calling start in :text="START",size_hint=(SizeW, SizeH), pos_hint={'x': . Thread(target=self. Once the threaded function (that isn't the animation) is done it switches screens to the 'Result' screen. How close kill a task started with asynckivy in Python3. start(self. join() the program just freezes and the when interacted with it does not respond. Ask Question Asked 7 years, 8 months ago. Threading Problem Kivy image texture not updating when threading is used. start() t1 Application¶. yodn mpd xmxt strk lexwlufx vxcu ullp ihfisdbb yvmp chh