lvgl/docs/widgets/core/switch.md

```eval_rst
.. include:: /header.rst 
:github_url: |github_link_base|/widgets/switch.md
```

# Switch (lv_switch)

## Overview

The Switch can be used to turn on/off something. It looks like a little slider. 


## Parts and Styles
- `LV_PART_MAIN` The background of the switch and it uses all the typical background style properties. `padding` makes the indicator smaller in the respective direction.
- `LV_PART_INDICATOR` The indicator the show the current state of the switch. Also uses all the typical background style properties.
- `LV_PART_KNOB` A rectangle (or circle) drawn at left or right side of teh indicator. It also uses all the typical background properties to describe the knob(s). By default the knob is square (with a optional radius) with side length equal to the smaller side of the slider. The knob can be made larger with the `padding` values. Padding values can be asymmetric too. 

## Usage

### Change state
When the switch is turned on it goes to `LV_STATE_CHACKED`. To get the current satte of the switch use `lv_obj_has_state(switch, LV_STATE_CHECHKED)`. 
To manually turn the switch on/off call `lvobj_add/clear_state(switch, LV_STATE_CHECKED)`.


## Events
- `LV_EVENT_VALUE_CHANGED` Sent when the switch changes state.

Learn more about [Events](/overview/event).

## Keys
- `LV_KEY_UP/RIGHT` Turns on the slider
- `LV_KEY_DOWN/LEFT` Turns off the slider
- `LV_KEY_ENTER` Toggles the switch 

Learn more about [Keys](/overview/indev).

## Example

```eval_rst

.. include:: ../../../examples/widgets/switch/index.rst

```

## API 

```eval_rst

.. doxygenfile:: lv_switch.h
  :project: lvgl
        
```