The Base Class of Objects with Traits

Objects in class HasTraits have traits as components that are correctly initialized using delayed construction with the TraitInstance function.

Public fields

call

The generating call

traits

A list of traits

suspended

Logical value; whether notifying observers is suspended.

observers

A list of observers, i.e. callback functions called by the notify method.

Methods

Public methods

• HasTraits$new()

• HasTraits$notify()

• HasTraits$observe()

• HasTraits$validate()

• HasTraits$clone()

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Method new()

Initialize an object

Usage

HasTraits$new(...)

Arguments

...

Initializsing values

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Method notify()

Notify observers about a trait being set to a value.

Usage

HasTraits$notify(tn, value)

Arguments

tn

A string, the name of the trait.

value

The value to which the trait is set.

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Method observe()

Install or remove an observer function.

Usage

HasTraits$observe(tn, observer, remove = FALSE)

Arguments

tn

A string, the name of a trait.

observer

A callback function, which should take three arguments, (1) the trait name, (2) the object that has the trait, (3)

remove

A logical value, indicates whether the observer is to be removed or added

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Method validate()

Install or remove the validator function of a trait.

Usage

HasTraits$validate(tn, validator, remove = FALSE)

Arguments

tn

A string, the name of a trait.

validator

A callback function

remove

A logical value, indicates whether the validator is to be removed or added

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Method clone()

The objects of this class are cloneable with this method.

Usage

HasTraits$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.