Version: 2021.3+
This example demonstrates how to create a “switch-like” variation of a toggle.
The example creates a custom control: a toggle that users can flip with the mouse, the keyboard, a gamepad, and other devices. It comes with a label that can describe what the toggle represents.
You can find the completed files that this example creates in this GitHub repository.
This guide is for developers familiar with the Unity Editor, UI(User Interface) Allows a user to interact with your application. Unity currently supports three UI systems. More info
See in Glossary Toolkit, and C# scripting. Before you start, get familiar with the following:
Create the slide toggle class with a C# script and style it with a USS file.
Create a Unity project with the 3D template. A 3D template has a better visual effect for this example. However, you can use any templates.
Create a folder named slide-toggle
to store your files.
In the slide-toggle
folder, create a C# script named SlideToggle.cs
.
Open SlideToggle.cs
in a text editor and replace its content with the following:
using UnityEngine;
using UnityEngine.UIElements;
namespace MyUILibrary
{
// Derives from BaseField<bool> base class. Represents a container for its input part.
public class SlideToggle : BaseField<bool>
{
public new class UxmlFactory : UxmlFactory<SlideToggle, UxmlTraits> { }
public new class UxmlTraits : BaseFieldTraits<bool, UxmlBoolAttributeDescription> { }
// In the spirit of the BEM standard, the SlideToggle has its own block class and two element classes. It also
// has a class that represents the enabled state of the toggle.
public static readonly new string ussClassName = "slide-toggle";
public static readonly new string inputUssClassName = "slide-toggle__input";
public static readonly string inputKnobUssClassName = "slide-toggle__input-knob";
public static readonly string inputCheckedUssClassName = "slide-toggle__input--checked";
VisualElement m_Input;
VisualElement m_Knob;
// Custom controls need a default constructor. This default constructor calls the other constructor in this
// class.
public SlideToggle() : this(null) { }
// This constructor allows users to set the contents of the label.
public SlideToggle(string label) : base(label, null)
{
// Style the control overall.
AddToClassList(ussClassName);
// Get the BaseField's visual input element and use it as the background of the slide.
m_Input = this.Q(className: BaseField<bool>.inputUssClassName);
m_Input.AddToClassList(inputUssClassName);
Add(m_Input);
// Create a "knob" child element for the background to represent the actual slide of the toggle.
m_Knob = new();
m_Knob.AddToClassList(inputKnobUssClassName);
m_Input.Add(m_Knob);
// There are three main ways to activate or deactivate the SlideToggle. All three event handlers use the
// static function pattern described in the Custom control best practices.
// ClickEvent fires when a sequence of pointer down and pointer up actions occurs.
RegisterCallback<ClickEvent>(evt => OnClick(evt));
// KeydownEvent fires when the field has focus and a user presses a key.
RegisterCallback<KeyDownEvent>(evt => OnKeydownEvent(evt));
// NavigationSubmitEvent detects input from keyboards, gamepads, or other devices at runtime.
RegisterCallback<NavigationSubmitEvent>(evt => OnSubmit(evt));
}
static void OnClick(ClickEvent evt)
{
var slideToggle = evt.currentTarget as SlideToggle;
slideToggle.ToggleValue();
evt.StopPropagation();
}
static void OnSubmit(NavigationSubmitEvent evt)
{
var slideToggle = evt.currentTarget as SlideToggle;
slideToggle.ToggleValue();
evt.StopPropagation();
}
static void OnKeydownEvent(KeyDownEvent evt)
{
var slideToggle = evt.currentTarget as SlideToggle;
// NavigationSubmitEvent event already covers keydown events at runtime, so this method shouldn't handle
// them.
if (slideToggle.panel?.contextType == ContextType.Player)
return;
// Toggle the value only when the user presses Enter, Return, or Space.
if (evt.keyCode == KeyCode.KeypadEnter || evt.keyCode == KeyCode.Return || evt.keyCode == KeyCode.Space)
{
slideToggle.ToggleValue();
evt.StopPropagation();
}
}
// All three callbacks call this method.
void ToggleValue()
{
value = !value;
}
// Because ToggleValue() sets the value property, the BaseField class dispatches a ChangeEvent. This results in a
// call to SetValueWithoutNotify(). This example uses it to style the toggle based on whether it's currently
// enabled.
public override void SetValueWithoutNotify(bool newValue)
{
base.SetValueWithoutNotify(newValue);
//This line of code styles the input element to look enabled or disabled.
m_Input.EnableInClassList(inputCheckedUssClassName, newValue);
}
}
}
In the slide-toggle
folder, create a USS file named SlideToggle.uss
.
Open SlideToggle.uss
in a text editor and replace its contents with the following:
.slide-toggle__input {
background-color: var(--unity-colors-slider_groove-background);
max-width: 25px;
border-top-left-radius: 8px;
border-bottom-left-radius: 8px;
border-top-right-radius: 8px;
border-bottom-right-radius: 8px;
overflow: visible;
border-left-width: 1px;
border-right-width: 1px;
border-top-width: 1px;
border-bottom-width: 1px;
border-right-color: var(--unity-colors-slider_thumb-border);
border-top-color: var(--unity-colors-slider_thumb-border);
border-bottom-color: var(--unity-colors-slider_thumb-border);
max-height: 16px;
margin-top: 10px;
border-left-color: var(--unity-colors-slider_thumb-border);
transition-property: background-color;
transition-duration: 0.5s;
}
.slide-toggle__input-knob {
height: 16px;
width: 16px;
background-color: var(--unity-colors-slider_thumb-background);
position: absolute;
border-top-left-radius: 25px;
border-bottom-left-radius: 25px;
border-top-right-radius: 25px;
border-bottom-right-radius: 25px;
top: -1px;
transition-property: translate, background-color;
transition-duration: 0.5s, 0.5s;
translate: -1px 0;
border-left-width: 1px;
border-right-width: 1px;
border-top-width: 1px;
border-bottom-width: 1px;
border-left-color: var(--unity-colors-slider_thumb-border);
border-right-color: var(--unity-colors-slider_thumb-border);
border-top-color: var(--unity-colors-slider_thumb-border);
border-bottom-color: var(--unity-colors-slider_thumb-border);
}
.slide-toggle__input--checked {
background-color: rgb(0, 156, 10);
}
.slide-toggle__input--checked > .slide-toggle__input-knob {
translate: 8px 0;
}
.slide-toggle:focus .slide-toggle__input-knob {
border-left-width: 1px;
border-right-width: 1px;
border-top-width: 1px;
border-bottom-width: 1px;
border-left-color: var(--unity-colors-input_field-border-focus);
border-right-color: var(--unity-colors-input_field-border-focus);
border-top-color: var(--unity-colors-input_field-border-focus);
border-bottom-color: var(--unity-colors-input_field-border-focus);
}
slide-toggle
folder, create a UI Document file named SlideToggleUsage.uxml
.SlideToggleUsage.uxml
in the UI Builder.SlideToggle.uss
as existing USS.SlideToggleUsage.uxml
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