An Object-Oriented Framework for Direct-Manipulation User Interfaces

Shan, Yen-Ping

doi:10.1007/978-3-642-76303-8_1

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1991

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Cited by 4 publications

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“…The second aspect is the procedural aspect, namely the actions taken when the constraint is violated. Constraints are used in numerous graphical applications [4,5,9,10,11,12,13,14,15,16,17,18,19]. In general, constraint programming systems appear to be limited to a specific domain.…”

Section: Introductionmentioning

confidence: 99%

Propagators and concurrent constraints

Laffra¹,

Bös²

1991

SIGPLAN OOPS Mess.

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A constraint is a numeric or geometric relationship between objects. Constraints have a declarative nature and are a natural way for describing relationships between objects. Combining constraint systems and object-oriented programming (COP) appears hard. All existing systems implicitly compromise the encapsulation principle of COP. Also, the constraint resolving mechanism is typically centralized, thereby restricting parallel execution of a constraint program. This paper proposes a mechanism that provides for constraints in the concurrent (parallel) object-oriented Procol environment. Constraints are implemented using propagators. Propagators are triggered by messages that are sent to objects. Propagator constraints are solved by local propagation of known state, intuitively allowing for parallel execution of a Procol constraint program.

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