UXML element UnsignedLongField

The UnsignedLongField lets users enter an unsigned long integer. An unsigned long integer is a 64-bit datum that encodes a non-negative integer in the range 0 to 18446744073709551615. You can set placeholder text to provide hints or instructions to the user on what to enter. You can also add validation functions to ensure that the entered data meets certain requirements.

Note: To align an UnsignedLongField 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 UnsignedLongField

You can create an UnsignedLongField with UI Builder, UXML, or C#. The following C# code creates an UnsignedLongField:

var unsignedLongField = new UnsignedLongField();

Set a placeholder text

You can set a placeholder text for the element. You can also hide the placeholder text on focus.

Note: The placeholder text won’t display if you set a value for the element. To unset a value in UI Builder, right-click the Value field in the element’s Inspector tab and select Unset.

In C#, use the placeholder and the hidePlaceholderOnFocus properties through textEdition:

myElement.textEdition.placeholder = "Enter your value here";
myElement.textEdition.hidePlaceholderOnFocus = true;

To style the placeholder text, use the .unity-base-text-field__input--placeholder USS selector.

Customize the input text selection

Input text is selectable by default. You can customize the selection behaviors such as selectAllOnMouseUP and selectAllOnFocus.

In C#, set them through textSelection:

myElement.textSelection.selectAllOnMouseUp = false;
myElement.textSelection.selectAllOnFocus = false;

示例

The following UXML example creates an UnsignedLongField:

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

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

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

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

C# base class and namespace

C# class: UnsignedLongField
Namespace: UnityEngine.UIElements
Base class: TextValueField_1

Inherited UXML attributes

This element inherits the following attributes from its base class:

名称	类型	描述
auto-correction	boolean	Determines if the touch screen keyboard auto correction is turned on or off.
binding-path	string	Path of the target property to be bound.
emoji-fallback-support	boolean	Specifies the order in which the system should look for Emoji characters when rendering text. If this setting is enabled, the global Emoji Fallback list will be searched first for characters defined as Emoji in the Unicode 14.0 standard.
focusable	boolean	True if the element can be focused.
hide-mobile-input	boolean	Hides or shows the mobile input field.
is-delayed	boolean	If set to true, the value property isn’t updated until either the user presses Enter or the text field loses focus.
keyboard-type	TouchScreenKeyboardType	The type of mobile keyboard that will be used.
label	string	The string representing the label that will appear beside the field.
max-length	int	Maximum number of characters for the field.
select-all-on-focus	boolean	Controls whether the element’s content is selected upon receiving focus.
select-all-on-mouse-up	boolean	Controls whether the element’s content is selected when you mouse up for the first time.
tabindex	int	An integer used to sort focusables in the focus ring. Must be greater than or equal to zero.
vertical-scroller-visibility	UIElements.ScrollerVisibility	Option for controlling the visibility of the vertical scroll bar in the TextInputBaseField_1.

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-unsigned-long-field	USS class name of elements of this type.
labelUssClassName	.unity-unsigned-long-field__label	USS class name of labels in elements of this type.
inputUssClassName	.unity-unsigned-long-field__input	USS class name of input elements in elements of this type.
ussClassName	.unity-base-text-field	USS class name of elements of this type.
labelUssClassName	.unity-base-text-field__label	USS class name of labels in elements of this type.
inputUssClassName	.unity-base-text-field__input	USS class name of input elements in elements of this type.
singleLineInputUssClassName	.unity-base-text-field__input--single-line	USS class name of single line input elements in elements of this type.
multilineInputUssClassName	.unity-base-text-field__input--multiline	USS class name of multiline input elements in elements of this type.
placeholderUssClassName	.unity-base-text-field__input--placeholder	USS class name of input elements when placeholder text is shown
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 LongField