I

IModelItem

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Base interface for items that can be used in a CanvasComponent.
ImplementsInheritance Hierarchy

Remarks

Most prominently this is the interface all graph elements used in IGraph implement.

It adds no functionality over the ILookup and ITagOwner interfaces it inherits.

See Also

Developer's Guide

Members

Show:

Properties

tag

: any
abstract
Gets or sets the tag object associated with this item instance.
The tag is an optional user-defined object which can be used to store arbitrary data related to this item. The item itself just provides the storage for the object.
abstract

Property Value

The user object associated with this item instance.

Examples

Setting a model item's tag
owner.tag = newTag
Getting the tag from a model item
const tag = owner.tag

See Also

Tags are presented in detail in the section The Graph Model.
Developer's Guide

Defined in

ITagOwner.tag

Methods

lookup

<T> (type: Constructor<T>): T
abstract
Returns an instance that implements the given type or null.
Typically, this method will be called to obtain a different view or aspect of the current instance. This is quite similar to casting or using a super type or interface of this instance, but is not limited to inheritance or compile-time constraints. An instance implementing this method is not required to return non-null implementations for the types, nor does it have to return the same instance any time. Also, it depends on the type and context whether the instance returned stays up to date or needs to be re-obtained for further use.
abstract

Parameters

type: Constructor<T>
the type for which an instance shall be returned

Return Value

T
an instance that is assignable to the type or null

See Also

Developer's Guide

Defined in

ILookup.lookup