UXML element EnumFlagsField

An EnumFlagsField allows you to select multiple values from an enumeration that are marked with the Flags attribute.

To align an EnumFlagsField 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 an EnumFlagsField

You can create an EnumField with UXML and C#.

Assume you have the following enumeration:

[Flags]
enum MyEnum
{
    None = 0,
    First = 1,
    Second = 2,
    Third = 4
}

The following C# example creates an EnumFlagsField with the MyEnum enumeration and selects the first and second values:

var myEnumFlagsField = new EnumFlagsField("Select Options", MyEnum.First | MyEnum.Second);

示例

The following UXML example creates an EnumFlagsField element:

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

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

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

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

C# base class and namespace

C# class: EnumFlagsField
Namespace: UnityEditor.UIElements
Base class: BaseMaskField_1

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.
value	string	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.
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 (ie. tree expanded states, scroll position, zoom level). This is the key used to save/load the view data from the view data store. Not setting this key will disable persistence for this VisualElement.

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-enum-flags-field	USS class name for elements of this type.
labelUssClassName	.unity-enum-flags-field__label	USS class name for labels of this type.
inputUssClassName	.unity-enum-flags-field__input	USS class name for input elements of this type.
ussClassName	.unity-base-popup-field	USS class name of elements of this type.
textUssClassName	.unity-base-popup-field__text	USS class name of text elements in elements of this type.
arrowUssClassName	.unity-base-popup-field__arrow	USS class name of arrow indicators in elements of this type.
labelUssClassName	.unity-base-popup-field__label	USS class name of labels in elements of this type.
inputUssClassName	.unity-base-popup-field__input	USS class name of input elements in elements 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 EnumField