Class VisualElementExtensions

Extensions for VisualElement class.

Inheritance

object

VisualElementExtensions

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: Unity.AppUI.UI

Assembly: Unity.AppUI.dll

Syntax

public static class VisualElementExtensions

Methods

EnablePicking(VisualElement, bool)

Set the picking mode of a VisualElement.

Declaration

public static void EnablePicking(this VisualElement element, bool enabled)

Parameters

Type	Name	Description
VisualElement	element	The VisualElement object.
bool	enabled	True to enable picking, false otherwise.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object can't be null.

GetChildren<T>(VisualElement, bool)

Get child elements of a given type.

Declaration

public static IEnumerable<T> GetChildren<T>(this VisualElement element, bool recursive) where T : VisualElement

Parameters

Type	Name	Description
VisualElement	element	The parent element.
bool	recursive	If true, the search will be recursive.

Returns

Type	Description
IEnumerable<T>	A list of child elements of the given type.

Type Parameters

Name	Description
T	The type of the child elements to search for.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object can't be null.

GetContextProvider<T>(VisualElement)

Find the closest context provider in the hierarchy of a VisualElement.

Declaration

public static VisualElement GetContextProvider<T>(this VisualElement element) where T : IContext

Parameters

Type	Name	Description
VisualElement	element	The VisualElement object.

Returns

Type	Description
VisualElement	The context provider.

Type Parameters

Name	Description
T	The type of the context.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object can't be null.

GetContext<T>(VisualElement)

Get the context of a given type in a VisualElement.

Declaration

public static T GetContext<T>(this VisualElement element) where T : IContext

Parameters

Type	Name	Description
VisualElement	element	The VisualElement object.

Returns

Type	Description
T	The context.

Type Parameters

Name	Description
T	The type of the context.

Remarks

This method will look for the context in the current element and its parents without checking if the element is part of the visual tree.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object can't be null.

GetExclusiveRootElement(VisualElement)

Retrieve the root element of a VisualElement in the current visual tree that is exclusive to this tree. In Runtime panel context, this is the root of the panel's visual tree directly. In Editor context, tabbed Editor windows share the same root container, so this method will return the child of the root container that is exclusive to this tree and will exclude any IMGUIContainer.

Declaration

public static VisualElement GetExclusiveRootElement(this VisualElement element)

Parameters

Type	Name	Description
VisualElement	element	The VisualElement object.

Returns

Type	Description
VisualElement	The root element of the visual tree.

GetPreferredTooltipPlacement(VisualElement)

Get the preferred placement for a VisualElement's Tooltip.

Declaration

public static PopoverPlacement GetPreferredTooltipPlacement(this VisualElement element)

Parameters

Type	Name	Description
VisualElement	element	The VisualElement which contains a tooltip.

Returns

Type	Description
PopoverPlacement	The preferred placement, previously set using SetPreferredTooltipPlacement(VisualElement, OptionalEnum<PopoverPlacement>) or the closest value set on an element.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object can't be null.

GetSelfContext<T>(VisualElement)

Get the context of a given type in a VisualElement if this element is provider of this context.

Declaration

public static T GetSelfContext<T>(this VisualElement element)

Parameters

Type	Name	Description
VisualElement	element	The VisualElement object.

Returns

Type	Description
T	The context if the element is provider of this context, null otherwise.

Type Parameters

Name	Description
T	The type of the context.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object can't be null.

GetTooltipContent(VisualElement)

Get the tooltip content for a VisualElement.

Declaration

public static VisualElementExtensions.TooltipContentCallback GetTooltipContent(this VisualElement element)

Parameters

Type	Name	Description
VisualElement	element	The target visual element.

Returns

Type	Description
VisualElementExtensions.TooltipContentCallback	The tooltip content callback.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object can't be null.

GetTooltipTemplate(VisualElement)

Get the tooltip template for a VisualElement.

Declaration

public static VisualElement GetTooltipTemplate(this VisualElement element)

Parameters

Type	Name	Description
VisualElement	element	The target visual element.

Returns

Type	Description
VisualElement	The tooltip template.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object can't be null.

IsContextProvider<T>(VisualElement)

Check if a VisualElement provides a context of a given type.

Declaration

public static bool IsContextProvider<T>(this VisualElement element) where T : IContext

Parameters

Type	Name	Description
VisualElement	element	The VisualElement object.

Returns

Type	Description
bool	True if the element provides the context, false otherwise.

Type Parameters

Name	Description
T	The type of the context.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object can't be null.

IsInvisible(VisualElement)

Check if a VisualElement is invisible.

Declaration

public static bool IsInvisible(this VisualElement element)

Parameters

Type	Name	Description
VisualElement	element	The VisualElement object.

Returns

Type	Description
bool	True if the element is invisible, false otherwise.

Remarks

An element is considered invisible if it's not attached to a panel, its visibility attribute is set to Hidden, has an opacity lower than 0.001 or has a display style set to None.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object can't be null.

ProvideContext<T>(VisualElement, T)

Make the element provide a context of a given type in a VisualElement.

Declaration

public static void ProvideContext<T>(this VisualElement element, T context) where T : IContext

Parameters

Type	Name	Description
VisualElement	element	The VisualElement object.
T	context	The context.

Type Parameters

Name	Description
T	The type of the context.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object can't be null.

RegisterContextChangedCallback<T>(VisualElement, EventCallback<ContextChangedEvent<T>>)

Register a callback to be invoked when the context of a given type changes in a VisualElement.

Declaration

public static void RegisterContextChangedCallback<T>(this VisualElement element, EventCallback<ContextChangedEvent<T>> callback) where T : IContext

Parameters

Type	Name	Description
VisualElement	element	The VisualElement object.
EventCallback<ContextChangedEvent<T>>	callback	The callback.

Type Parameters

Name	Description
T	The type of the context.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object and the callback can't be null.

SetPreferredTooltipPlacement(VisualElement, OptionalEnum<PopoverPlacement>)

Set a preferred Tooltip placement.

Declaration

public static void SetPreferredTooltipPlacement(this VisualElement element, OptionalEnum<PopoverPlacement> placement)

Parameters

Type	Name	Description
VisualElement	element	The target visual element.
OptionalEnum<PopoverPlacement>	placement	The placement value.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object can't be null.

SetTooltipContent(VisualElement, TooltipContentCallback)

Set the tooltip content for a VisualElement.

Declaration

public static void SetTooltipContent(this VisualElement element, VisualElementExtensions.TooltipContentCallback callback)

Parameters

Type	Name	Description
VisualElement	element	The target visual element.
VisualElementExtensions.TooltipContentCallback	callback	The callback to invoke to populate the tooltip.

Remarks

You must call SetTooltipTemplate(VisualElement, VisualElement) method first in order to have a valid tooltip template to populate.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object and the callback can't be null.
InvalidOperationException	You must call SetTooltipTemplate before setting the tooltip content.

SetTooltipTemplate(VisualElement, VisualElement)

Set the tooltip template for a VisualElement.

Declaration

public static void SetTooltipTemplate(this VisualElement element, VisualElement template)

Parameters

Type	Name	Description
VisualElement	element	The target visual element.
VisualElement	template	The tooltip template.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object can't be null.

UnregisterContextChangedCallback<T>(VisualElement, EventCallback<ContextChangedEvent<T>>)

Unregister a callback to be invoked when the context of a given type changes in a VisualElement.

Declaration

public static void UnregisterContextChangedCallback<T>(this VisualElement element, EventCallback<ContextChangedEvent<T>> callback) where T : IContext

Parameters

Type	Name	Description
VisualElement	element	The VisualElement object.
EventCallback<ContextChangedEvent<T>>	callback	The callback.

Type Parameters

Name	Description
T	The type of the context.

Exceptions

Type	Condition
ArgumentNullException	The VisualElement object and the callback can't be null.