UXML element ToggleButtonGroup

Use ToggleButtonGroup to enable single or multiple selections from a logical group of Button elements. The ToggleButtonGroup consists of a label and a set of interactable Button elements.

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 ToggleButtonGroup

You can create a ToggleButtonGroup with UI Builder, UXML, and C#.

UI Builder

To create a ToggleButtonGroup in UI Builder:

1. Drag ToggleButtonGroup from the Library panel into the Hierarchy panel.
2. Add a set of Button elements to the ToggleButtonGroup element as its child elements.

To create a ToggleButtonGroup in UXML, add a ToggleButtonGroup element to a UXML document and add a set of Button elements as its child elements. For example:

C#

To create a ToggleButtonGroup in C#, create a new instance of a ToggleButtonGroup object and add a set of Buttons. For example:

ToggleButtonGroup myElement = new ToggleButtonGroup("Label text");
myElement.Add(new Button("Button 1"));
myElement.Add(new Button("Button 2"));
myElement.Add(new Button("Button 3"));

By default, you can select one button at a time. To enable multiple selections, set the is-multiple-selection to true.

To enable empty selection, set the allow-empty-selection to true.

示例

The following UXML example creates a ToggleButtonGroup with Buttons:

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

The following C# example illustrates some of the customizable functionalities of the ToggleButtonGroup and its Buttons:

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

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

C# base class and namespace

C# class: ToggleButtonGroup
Namespace: UnityEngine.UIElements
Base class: BaseField_1

Member UXML attributes

This element has the following member attributes:

名称	类型	描述
allow-empty-selection	boolean	Allows having all buttons to be unchecked when set to true. When the property value is false, the control will automatically set the first available button to checked.
is-multiple-selection	boolean	Whether all buttons can be selected.

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.

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-button-group	USS class name of elements for this type.
containerUssClassName	.unity-toggle-button-group__container	USS class name of container element of this type.
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

• UXML element Button