UXML element Toggle

A Toggle includes an image and a label. Just like other standard UI Toolkit controls, such as a Button, a Toggle has a Clickable manipulator attached to it that registers to MouseUpEvent and PointerUpEvent. When one of those events triggers the manipulator, the Toggle’s value changes from true to false or from false to true. You can read or set the current values of a Toggle. You can also bind a Toggle to a Boolean variable.

By default, a Toggle control appears as a checkbox. You can apply styles to make it look like a typical toggle switch.

You can display or hide elements based on other conditions, such as a selection from a drop-down, or an enabled option. An example of a conditional UI is the Unity Camera Inspector. It displays additional options when you activate Physical Camera mode.

Note: To align an element with other fields in an Inspector window, simply apply the .unity-base-field__aligned USS class to it. For more information, refer to BaseField.

Create a Toggle

You can create a Toggle with UI Builder, UXML, or C#.

The following C# examples creates a Toggle with a specific label:

Toggle myToggle = new Toggle("Click me");

示例

The following UXML example creates a Toggle:

[!code-xml[(External/Resources/editor_resources/Assets/Editor Default Resources/UIPackageResources/Snippets/UXML/ToggleSnippet.uxml)]

The following C# example illustrates some of the customizable functionalities of the Toggle:

[!code-cs[(Modules/UIElementsSamplesEditor/Snippets/ToggleSnippet.cs#sample)]

To try this example live in Unity, go to Window > UI Toolkit > Samples.

For more examples, refer to the following:

• Create a conditional UI.

C# base class and namespace

C# class: Toggle
Namespace: UnityEngine.UIElements
Base class: BaseBoolField

Inherited UXML attributes

This element inherits the following attributes from its base class:

名称	类型	描述
binding-path	string	Path of the target property to be bound.
focusable	boolean	True if the element can be focused.
label	string	The string representing the label that will appear beside the field.
tabindex	int	An integer used to sort focusables in the focus ring. Must be greater than or equal to zero.
text	string	Optional text that appears after the BaseBoolField. Unity creates a Label automatically if one does not exist.
value	boolean	The value associated with the field.

This element also inherits the following attributes from VisualElement:

名称	类型	描述
content-container	string	Child elements are added to it, usually this is the same as the element itself.
data-source	Object	Assigns a data source to this VisualElement which overrides any inherited data source. This data source is inherited by all children.
data-source-path	string	Path from the data source to the value.
name	string	The name of this VisualElement. Use this property to write USS selectors that target a specific element. The standard practice is to give an element a unique name.
picking-mode	UIElements.PickingMode	Determines if this element can be pick during mouseEvents or IPanel.Pick queries.
style	string	Reference to the style object of this element. Contains data computed from USS files or inline styles written to this object in C#.
tooltip	string	Text to display inside an information box after the user hovers the element for a small amount of time. This is only supported in the Editor UI.
usage-hints	UIElements.UsageHints	A combination of hint values that specify high-level intended usage patterns for the VisualElement. This property can only be set when the VisualElement is not yet part of a Panel. Once part of a Panel, this property becomes effectively read-only, and attempts to change it will throw an exception. The specification of proper UsageHints drives the system to make better decisions on how to process or accelerate certain operations based on the anticipated usage pattern. Note that those hints do not affect behavioral or visual results, but only affect the overall performance of the panel and the elements within. It’s advised to always consider specifying the proper UsageHints, but keep in mind that some UsageHints might be internally ignored under certain conditions (e.g. due to hardware limitations on the target platform).
view-data-key	string	Used for view data persistence, such as tree expanded states, scroll position, or zoom level. This key is used to save and load the view data from the view data store. If you don’t set this key, the persistence is disabled for the associated VisualElement. For more information, refer to View data persistence.

USS classes

The following table lists all the C# public property names and their related USS selector.

C# property	USS selector	描述
ussClassName	.unity-toggle	USS class name for Toggle elements. Unity adds this USS class to every instance of the Toggle element. Any styling applied to this class affects every Toggle located beside, or below the stylesheet in the visual tree.
labelUssClassName	.unity-toggle__label	USS class name for Labels in Toggle elements. Unity adds this USS class to the Label sub-element of the Toggle if the Toggle has a Label.
inputUssClassName	.unity-toggle__input	USS class name of input elements in Toggle elements. Unity adds this USS class to the input sub-element of the Toggle. The input sub-element provides responses to the manipulator.
noTextVariantUssClassName	.unity-toggle--no-text	USS class name of Toggle elements that have no text. Unity adds this USS class to the Toggle if the Toggle does not have a label.
checkmarkUssClassName	.unity-toggle__checkmark	USS class name of Images in Toggle elements. Unity adds this USS class to the Image sub-element of the Toggle that contains the checkmark image.
textUssClassName	.unity-toggle__text	USS class name of Text elements in Toggle elements. Unity adds this USS class to Text sub-elements of the Toggle.
mixedValuesUssClassName	.unity-toggle__mixed-values	USS class name of Toggle elements that have mixed values Unity adds this USS class to checkmark of the Toggle when it has mixed values.
ussClassName	.unity-base-field	USS class name of elements of this type.
labelUssClassName	.unity-base-field__label	USS class name of labels in elements of this type.
inputUssClassName	.unity-base-field__input	USS class name of input elements in elements of this type.
noLabelVariantUssClassName	.unity-base-field--no-label	USS class name of elements of this type, when there is no label.
labelDraggerVariantUssClassName	.unity-base-field__label--with-dragger	USS class name of labels in elements of this type, when there is a dragger attached on them.
mixedValueLabelUssClassName	.unity-base-field__label--mixed-value	USS class name of elements that show mixed values
alignedFieldUssClassName	.unity-base-field__aligned	USS class name of elements that are aligned in a inspector element
disabledUssClassName	.unity-disabled	USS class name of local disabled elements.

You can also use the Matching Selectors section in the Inspector or the UI Toolkit Debugger to see which USS selectors affect the components of the VisualElement at every level of its hierarchy.

其他资源

• Foldout