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

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.