CustomBinding

class in UnityEngine.UIElements

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Inherits from:UIElements.Binding

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Implemented in:UnityEngine.UIElementsModule

Description

Base class for general purpose binding extensibility.

The following example creates a custom binding that displays the current time. You can bind it to the text field of a Label to create a clock.

using System;
using Unity.Properties;
using UnityEngine.UIElements;

[UxmlObject] public partial class CurrentTimeBinding : CustomBinding { [UxmlAttribute] public string timeFormat = "HH:mm:ss";

public CurrentTimeBinding() { updateTrigger = BindingUpdateTrigger.EveryUpdate; }

protected override BindingResult Update(in BindingContext context) { var timeNow = DateTime.Now.ToString(timeFormat); var element = context.targetElement; if (ConverterGroups.TrySetValueGlobal(ref element, context.bindingId, timeNow, out var errorCode)) return new BindingResult(BindingStatus.Success);

// Error handling var bindingTypename = TypeUtility.GetTypeDisplayName(typeof(CurrentTimeBinding)); var bindingId = $"{TypeUtility.GetTypeDisplayName(element.GetType())}.{context.bindingId}";

return errorCode switch { VisitReturnCode.InvalidPath => new BindingResult(BindingStatus.Failure, $"{bindingTypename}: Binding id `{bindingId}` is either invalid or contains a `null` value."), VisitReturnCode.InvalidCast => new BindingResult(BindingStatus.Failure, $"{bindingTypename}: Invalid conversion from `string` for binding id `{bindingId}`"), VisitReturnCode.AccessViolation => new BindingResult(BindingStatus.Failure, $"{bindingTypename}: Trying set value for binding id `{bindingId}`, but it is read-only."), _ => throw new ArgumentOutOfRangeException() }; } }

Public Methods

Update Called when the binding system updates the binding.

Inherited Members

Properties

isDirty When set to true, the binding instance updates during the next update cycle. When set to false, the binding instance updates only if a change is detected.
updateTrigger When set to BindingUpdateTrigger.EveryUpdate, the binding instance updates in every update, regardless of the data source version.

Public Methods

MarkDirty Notifies the binding system to process this binding.
OnActivated Called when the binding becomes active for a specific VisualElement.
OnDataSourceChanged Called when the resolved data source of a binding changes.
OnDeactivated Called when the binding is no longer active for a specific VisualElement.

Static Methods

ResetPanelLogLevel Resets the log level for binding failures on a panel to use the global setting.
SetGlobalLogLevel Sets the log level for all binding failures.
SetPanelLogLevel Sets the log level for binding failures on a panel.

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