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Kivy Base

This module contains core Kivy functionality and is not intended for end users. Feel free to look though it, but calling any of these methods directly may well result in unpredictable behavior.

Event loop management

kivy.base.EventLoop = <kivy.base.EventLoopBase object>

EventLoop instance

class kivy.base.EventLoopBase[source]

Bases: kivy.event.EventDispatcher

Main event loop. This loop handles the updating of input and dispatching events.


Add a new event listener for getting touch events.

add_input_provider(provider, auto_remove=False)[source]

Add a new input provider to listen for touch events.


Add a postproc input module (DoubleTap, TripleTap, DeJitter RetainTouch are defaults).


Exit from the main loop and stop all configured input providers.


Called by idle() to read events from input providers, pass events to postproc, and dispatch final events.


Ensure that we have a window.


Close the main loop and close the window.


This function is called after every frame. By default:

  • it “ticks” the clock to the next frame.
  • it reads all input and dispatches events.
  • it dispatches on_update, on_draw and on_flip events to the window.

Event handler for on_pause which will be fired when the event loop is paused.


Event handler for on_start which will be fired right after all input providers have been started.


Event handler for on_stop events which will be fired right after all input providers have been stopped.

post_dispatch_input(etype, me)[source]

This function is called by dispatch_input() when we want to dispatch an input event. The event is dispatched to all listeners and if grabbed, it’s dispatched to grabbed widgets.


Remove an event listener from the list.


Remove an input provider.


Remove a postproc module.


Main loop


Set the window used for the event loop.


Must be called only once before run(). This starts all configured input providers.


Stop all input providers and call callbacks registered using EventLoop.add_stop_callback().


Return the list of all touches currently in down or move states.

class kivy.base.ExceptionHandler[source]

Bases: builtins.object

Base handler that catches exceptions in runTouchApp(). You can subclass and extend it as follows:

class E(ExceptionHandler):
    def handle_exception(self, inst):
        Logger.exception('Exception catched by ExceptionHandler')
        return ExceptionManager.PASS


All exceptions will be set to PASS, and logged to the console!


Handle one exception, defaults to returning ExceptionManager.STOP.

class kivy.base.ExceptionManagerBase[source]

Bases: builtins.object

ExceptionManager manages exceptions handlers.


Add a new exception handler to the stack.


Called when an exception occurred in the runTouchApp() main loop.


Remove a exception handler from the stack.

kivy.base.ExceptionManager = <kivy.base.ExceptionManagerBase object>

Instance of a ExceptionManagerBase implementation.

kivy.base.runTouchApp(widget=None, slave=False)[source]

Static main function that starts the application loop. You can access some magic via the following arguments:


To make dispatching work, you need at least one input listener. If not, application will leave. (MTWindow act as an input listener)


If you pass only a widget, a MTWindow will be created and your widget will be added to the window as the root widget.


No event dispatching is done. This will be your job.

widget + slave

No event dispatching is done. This will be your job but we try to get the window (must be created by you beforehand) and add the widget to it. Very useful for embedding Kivy in another toolkit. (like Qt, check kivy-designed)


Stop the current application by leaving the main loop